Our factory has a "Nudi" six-color rotary commercial form printing machine imported from Spain. In the domestic agents, there is very little agency for this brand name printer. Therefore, when the machine has more complicated breakdowns, it can only be resolved through Hong Kong's transfer to Spanish manufacturers. This is very inconvenient. In recent years, I have encountered many failure phenomena in the process of managing and participating in the maintenance of machines, and have certain universality in rotary printing presses. Introduce examples of electrical faults for reference by peers.
First, tension system failure
In production, workers determine the product's tension by measuring the product on a three-meter ruler and adjusting the tension. When the tension system fails, the tension of a roll of paper measured during printing is very unstable, no matter how to adjust the tension data of the machine, it fails to achieve the ideal; at the same time, the tension rod floats up and down during operation even after the adjustment is stable. When the roll diameter is still 20 ~ 30cm, the tension system disappears. By analyzing our view, when the roll diameter is large, although the tension is not stable, there is still room for adjustment, indicating that the control circuit of the tension system has not failed. The balance force of the tension bar is adjusted by the drum. This type of tension magnetic hub is permanent magnetic rather than electromagnetic. Due to the operation of the machine for many years, the loss is large and the magnetic force is not uniform, so that it is easy to cause unstable tension. If you do not want to replace the magnetic hub at this time, you can solve this problem: wipe the worn magnetic powder, clean it with gasoline, and carefully grind the contact surface. This can temporarily solve the problem of this type of tension system. To make the hub durable, it should be regularly maintained. Remove the magnetic hub every six months to remove the worn magnetic powder and carefully inspect the surface.
Second, the main motor common fault
The press usually uses a DC motor as the main drive motor. Our factory's "Nudi" brand printer is using this type of motor. The most common fault is the spark between the brush and the commutator, which burns the commutator surface. When the motor is not operating normally, it shows that the speed is slow, the tremble at low speed, the operation at high speed is not smooth, and there is a squeak, which seems to be different sound from the rotating shaft, people think that the bearing of the rotating shaft is broken. . Therefore, when you hear this kind of noise, do not easily judge the failure of the bearing, so as to avoid doing a lot of useless work. It may be advisable to check the brush and commutator of the main motor first. Normally, the spark between the brush and the commutator is light blue, weak and fine, the brush's contact surface is smooth and bright, and the commutator surface forms a reddish-brown oxide film; in case of failure, the spark is yellow Red, and relatively bright, makes the brush contact surface uneven, commutator surface black, burning marks. Of course, when the brush deviates from the geometrical neutral line or there is an open circuit or short circuit inside the armature winding, a strong spark may also appear. Also, if the brush pressure is too large, too small, or the grinding is not good, too little contact surface will produce a fault spark. In addition, when the main motor power supply is in phase loss, the above-mentioned abnormal sound may also occur, but it is generally accompanied by a weak hum.
Third, speed generator failure
When the machine is running, if it is found that it seems that abnormal sound is transmitted from the rotating shaft, and the speed is obviously observed to be unstable at low speed, the speed number indicated in the speed display on the operating surface jumps up and down within a certain range, but can be performed through the knob. Speed ​​control, then first check the tachometer generator and check if its belt is loose. Because it is driven by the main rotating shaft to drive the tachogenerator, the voltage signal output by the tachogenerator is fed back to the mainboard. The closed loop system of this negative feedback is used to regulate and control the host. The looseness of the belt will directly affect the voltage stability fed back to the main board, thus causing the main engine's rotational speed to fluctuate, causing an abnormal sound to be generated quickly and slowly when rotating the shaft. If there is no problem with the belt, then in all likelihood the tachometer generator itself has failed. As the rotor of the tachogenerator disconnects a group of windings, the above-mentioned fault condition will also occur. It is troublesome to judge whether the speed measuring motor is faulty, unless the motor is burned out and this kind of serious failure. If only a set of windings is broken, the output voltage of the rotating multimeter is basically stable and linear when measured by the multimeter. In this case, only the speed measuring motor can be measured patiently for each group of windings. There is a big difference between imported speed measuring motors and domestic ones. Most of the imported quadrupole motors have a small size and the windings are very small. They are extremely fragile and must be repaired at a professional level maintenance department.
Fourth, abnormal failure of automatic shutdown for no reason
This kind of failure is rare, but I encountered it once in the management of equipment. The fault is such that, during operation, the machine will automatically stop for no reason. The display on the operation panel alternates with a "10" stop symbol code and a "00" normal boot symbol code, which prevents the operator from booting normally. Sometimes it stops automatically after 3 to 5 minutes of running, and sometimes it can run for several hours without any failure. We first checked the various switches, especially the shutdown switch, and found no abnormalities. We checked the driver's lighting conditions. As with the information provided by the manufacturer, the drive was able to work properly without any faults. There were no disconnected lines or loose connections. . For this kind of situation, we can't solve the problem with our brains. At the end, we can only think that it is a problem on the switch. In particular, the commonly used shutdown switches, although we did not find any abnormalities during the inspection, but they are used for many years and the most commonly used, it may appear that the phenomenon of non-broken off. Later, all the commonly used shutdown switches were replaced, and as a result, the shutdowns for no reason disappeared.
First, tension system failure
In production, workers determine the product's tension by measuring the product on a three-meter ruler and adjusting the tension. When the tension system fails, the tension of a roll of paper measured during printing is very unstable, no matter how to adjust the tension data of the machine, it fails to achieve the ideal; at the same time, the tension rod floats up and down during operation even after the adjustment is stable. When the roll diameter is still 20 ~ 30cm, the tension system disappears. By analyzing our view, when the roll diameter is large, although the tension is not stable, there is still room for adjustment, indicating that the control circuit of the tension system has not failed. The balance force of the tension bar is adjusted by the drum. This type of tension magnetic hub is permanent magnetic rather than electromagnetic. Due to the operation of the machine for many years, the loss is large and the magnetic force is not uniform, so that it is easy to cause unstable tension. If you do not want to replace the magnetic hub at this time, you can solve this problem: wipe the worn magnetic powder, clean it with gasoline, and carefully grind the contact surface. This can temporarily solve the problem of this type of tension system. To make the hub durable, it should be regularly maintained. Remove the magnetic hub every six months to remove the worn magnetic powder and carefully inspect the surface.
Second, the main motor common fault
The press usually uses a DC motor as the main drive motor. Our factory's "Nudi" brand printer is using this type of motor. The most common fault is the spark between the brush and the commutator, which burns the commutator surface. When the motor is not operating normally, it shows that the speed is slow, the tremble at low speed, the operation at high speed is not smooth, and there is a squeak, which seems to be different sound from the rotating shaft, people think that the bearing of the rotating shaft is broken. . Therefore, when you hear this kind of noise, do not easily judge the failure of the bearing, so as to avoid doing a lot of useless work. It may be advisable to check the brush and commutator of the main motor first. Normally, the spark between the brush and the commutator is light blue, weak and fine, the brush's contact surface is smooth and bright, and the commutator surface forms a reddish-brown oxide film; in case of failure, the spark is yellow Red, and relatively bright, makes the brush contact surface uneven, commutator surface black, burning marks. Of course, when the brush deviates from the geometrical neutral line or there is an open circuit or short circuit inside the armature winding, a strong spark may also appear. Also, if the brush pressure is too large, too small, or the grinding is not good, too little contact surface will produce a fault spark. In addition, when the main motor power supply is in phase loss, the above-mentioned abnormal sound may also occur, but it is generally accompanied by a weak hum.
Third, speed generator failure
When the machine is running, if it is found that it seems that abnormal sound is transmitted from the rotating shaft, and the speed is obviously observed to be unstable at low speed, the speed number indicated in the speed display on the operating surface jumps up and down within a certain range, but can be performed through the knob. Speed ​​control, then first check the tachometer generator and check if its belt is loose. Because it is driven by the main rotating shaft to drive the tachogenerator, the voltage signal output by the tachogenerator is fed back to the mainboard. The closed loop system of this negative feedback is used to regulate and control the host. The looseness of the belt will directly affect the voltage stability fed back to the main board, thus causing the main engine's rotational speed to fluctuate, causing an abnormal sound to be generated quickly and slowly when rotating the shaft. If there is no problem with the belt, then in all likelihood the tachometer generator itself has failed. As the rotor of the tachogenerator disconnects a group of windings, the above-mentioned fault condition will also occur. It is troublesome to judge whether the speed measuring motor is faulty, unless the motor is burned out and this kind of serious failure. If only a set of windings is broken, the output voltage of the rotating multimeter is basically stable and linear when measured by the multimeter. In this case, only the speed measuring motor can be measured patiently for each group of windings. There is a big difference between imported speed measuring motors and domestic ones. Most of the imported quadrupole motors have a small size and the windings are very small. They are extremely fragile and must be repaired at a professional level maintenance department.
Fourth, abnormal failure of automatic shutdown for no reason
This kind of failure is rare, but I encountered it once in the management of equipment. The fault is such that, during operation, the machine will automatically stop for no reason. The display on the operation panel alternates with a "10" stop symbol code and a "00" normal boot symbol code, which prevents the operator from booting normally. Sometimes it stops automatically after 3 to 5 minutes of running, and sometimes it can run for several hours without any failure. We first checked the various switches, especially the shutdown switch, and found no abnormalities. We checked the driver's lighting conditions. As with the information provided by the manufacturer, the drive was able to work properly without any faults. There were no disconnected lines or loose connections. . For this kind of situation, we can't solve the problem with our brains. At the end, we can only think that it is a problem on the switch. In particular, the commonly used shutdown switches, although we did not find any abnormalities during the inspection, but they are used for many years and the most commonly used, it may appear that the phenomenon of non-broken off. Later, all the commonly used shutdown switches were replaced, and as a result, the shutdowns for no reason disappeared.
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