Spray drying tower system for re-dispersible polymer powders test. Since Denmark introduced the system, manufactured by 麦尼鲁, model Production minor / 12.5, drying tower by the high speed atomizer, hair dryer, flash dryer, cyclones, heating box, feeding systems, filling pusher, the wind system , blast doors and control cabinets. 1. The device is running a sudden smoke, smoke alarm, alarm system because the combustion air inlet filter. Off site immediately extinguish the fire. Inspection found that the combustion air intake filters produce large ash; control cabinet inlet air temperature display is normal; a set of electric heater damage; then there are a lot of bulk materials barrel. System long in dust environment, a lot of dust adhering to the intake air filter cartridge (paper), leading into the wind speed is much lower than the process design requirements (2m3 / s), the heating chamber temperature. When the temperature reaches the filter self-ignition temperature, spontaneous combustion caused by the filter. Signal feedback line attached to the bottom of the heating tank, after overheating, temperature tester wire damage, temperature feedback signal can not return, heating regulator circuit, automatic adjustment can not be achieved; heater can not be powered down, a group of high-power heater burned; When the operator off, some of the atomization drying tower material can not dry, condensation occurs, generate massive. The heater inlet tube leads workshops, avoid heating tank filter blocked by dust adhering to ensure that the heating chamber into the wind speed. Reconstruction heating tank temperature tester installation, just place the probe in the heating cabinet, signal feedback line through insulation, fire protection, heating box attached to the outside. The thermostat heater control circuit in series in the main control circuit devices. When the heater temperature is higher than the set temperature, the system power in time to avoid accidents. 2. High-speed atomizer severe vibration noisy high-speed atomizer, the high-speed motor, materials distributor, flash dryer, the composition of the atomizer wheel, the motor model VFS31.09- 24, speed 10000 ~ 30000r / min, operating current 0.47A, Made in Germany. Operation, the high-speed atomizer severe vibration, issued a "creak" sound, the motor running current of 0.55A. After the disintegration of the discovery, the atomizer wheel, the material distributor are intact, after the motor bearing cracks, about 8mm, the rear bearing inner ring raceway has a 0.5mm deep signs of wear, and there bluing phenomenon, cage broken. Also found traces of a slight friction between the rotor and the stator. Preliminary judgment, high-speed operation of the motor caused by poor lubrication. Detection and coaxial rotor dynamic balance test, meet the technical requirements. TIG welding with post-motor bearing, and correct processing. Replace the motor bearings before (Model HSS7002, HSS7004, FAG). When commissioning, the speed at 20000r / min, appeared shaken vigorously and issued a "creak" sound, motor current up to 0.5A. On-site detection 思泰克 CMS2977 Maintenance System. Radial vertical (V) and axial three directions (A) measuring point is set at the front and rear bearings in the motor were taken radial horizontal (H) for each point, the results are shown in Table 1. When the motor is idling and load operation, each point vibration values ??do not change significantly, indicating independent of vibration and the atomizer wheel, has nothing to do with the material dispenser. Motor measuring point radial vibration and axial vibration level is greater and rear bearing vibration at significantly greater than the previous bearing. It showed significant imbalance couple characteristics that have a great relationship with the bearing. Since the rear end face of the bearing post welding machining machine, it is difficult to achieve the original bearing position accuracy after processing, which in terms of the separation of bearings, will cause clearance increased, resulting in severe vibration running. The centrifugal force generated by high-speed rotary atomizer wheel is unbalanced force of the motor rotor. Since the bearing radial clearance exists in the uneven ball non-load zone, will appear abnormal noise and vibration. After installation of the motor bearing at a wave spring (thickness 0.5mm, an outer diameter of 32mm, an inner diameter of 28mm). After installation, the spring has a preload compression 1.5mm, axial displacement of the bearing can be compensated. When the rotor heat change, the bearing inner ring moves, eliminate excess bearing clearance. After the treatment, the motor is running so far, each measuring point vibration values ??are in good range. 

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