During the long-term use of the speed-adjusting motor of the offset press, due to the poor working environment conditions around the ground and untidy ground, the time is long. It is easy to make dust due to electrification and the suction effect of the armature and the electromagnetic attraction of the motor. , Paper wool, metal shavings, etc. enter the interior of the motor and adhere to the inner hole of the clutch armature and the surface of the magnetic pole rotor. Once accumulated too much, the gap between them will be blocked, so that the magnetic pole rotor and the asynchronous motor rotate at the same speed, and the phenomenon of printing high speed "speeding" and the speed cannot be adjusted. In serious cases, the relevant components of the ring motor slip clutch control device may be damaged. Therefore, the slip motor of the offset press should be removed and cleaned regularly every year to avoid such problems. The electrical system of the offset press will fail due to poor maintenance.
The main drive motor does not operate normally
Slip motors will violently vibrate during operation, causing bearings to heat up. Disassemble the clutch armature and magnetic pole rotor, and check whether the bearing of the motor is seriously lacking in lubricating grease, which causes serious wear of the bearing and reduces the running performance of the motor. In this case, the damaged bearings need to be replaced and filled with grease. Under normal circumstances, all parts of this part of the mechanism should be cleaned and oiled once to ensure the normal operation of the main drive motor.
The speed of the host machine periodically decreases
In this case, most of them are caused by the failure of the mechanical part. There are many rubber rollers in the offset press, and each rubber roller is supported by the bearing to rotate. If the bearing of any end of a rubber roller fails, the rotation speed of the main unit may periodically drop. In severe cases, the rotation of the main unit will be more difficult, and the bearing should be replaced immediately. In addition, you should pay attention to whether the working conditions of the bearings and their lubrication parts of the cylinders of the host machine including printing plates, rubber, and impression cylinders are normal. If a failure occurs, the printing speed will also be affected.
After the offset printing machine speeds up, the speed gradually decreases and even stops
In this case, you need to observe the change of the ammeter pointer in the electrical cabinet of the offset press. If its indication current increases sharply, the overload protection device such as the thermal relay of the main motor will inevitably produce a protective action, causing the main motor to disconnect the three-phase power supply and stop running. At this time, it is necessary to carefully check the related wiring components of the main motor circuit and the AC contactor of the main motor, all the thermal relays in the electrical cabinet of the offset press, etc., whether the wiring parts of the overload protection device are loose, whether the contact is bad and generate heat. If there is a problem in these parts, after the main motor speed is increased, the current in the circuit will increase rapidly due to poor contact between the wires and components in the circuit, which will cause a protective shutdown. When the running speed of the offset printing machine is low, the working current of the main motor is small, and the gradual decrease of the speed will not even stop. However, when the offset printing machine speeds up, the power load is large, and the failure of electrical components will Revealed.
In actual work, sometimes you can see that the terminals in the electrical cabinet of the offset press are heated due to poor wire contact, and even oxide layers appear at the connection, and the insulation of the wire is scorched and discolored. These problems will seriously affect the main drive motor. Normal operation. At this time, the operator needs to take corresponding measures immediately, such as cleaning the contact surface of the terminal and the wire, tightening the wire screw, removing the burned wire oxide layer, and replacing the damaged terminal.
The main drive motor is noisy when running
In order to adjust the dynamic balance of the slip motor, the armature and the pole rotor are equipped with counterweights at both ends. If this part of the device is slightly loose, the slip motor will deviate from the original position when it rotates at high speed. If the fault occurs on the outer surface of the main drive motor, it will cause local friction between the armature and the pole rotor, increasing noise. At this time, it is necessary to stop and repair, restore the dynamic balance of the armature and the magnetic pole rotor, and find the position of the original dynamic balance weight again and fix it to make the main drive motor run normally.
Brake electromagnetic clutch of main drive motor burned out
The yoke, armature, friction plate and other parts of the brake clutch of the offset press must be kept clean, free of oil stains and any debris.
Regardless of any electrical components, if excessive impurities such as paper wool, dust and metal shavings are adhered, the electrical components will easily heat up and have poor contact when working for a long time, and these impurities in the friction plates increase the clutch's non-absorption Friction load and damage when closing. At this time, the electrical components are not attracted due to poor contact, causing their temperature to rise, and the insulation of the brake electromagnetic clutch coil will be damaged prematurely, which will eventually burn them out. Therefore, special attention should be paid to maintenance, and regularly clean the oil stains and other impurities on the friction plates and other components with a brush dipped in gasoline, and clean the paper wool, dust and other impurities on all electrical components in the electrical cabinet of the offset press to facilitate the cooling and ventilation of the clutch Reduce losses, lower operating temperature, and extend the service life of electrical components.
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