Roots blower is made of all high-speed machines, so it will cause a sensation. Because the pulsation of its internal air also increases the sensation of roots blower, the Roots blower is simply worn. We introduce the comprehensive inspection method for roots blower repair. In order to ensure the safe operation of roots blower repair, it is not allowed to carry external loads such as pipes, valves and structures.
Fill the oil tank with mechanical oil of regular trademark into the oil level line, and the lubricating oil trademark is N220 medium load operation gear oil. Check the alignment and alignment quality of Roots blower and motor. Check whether the base of the unit is fully padded and whether the foundation bolts are fastened. Check whether the rotation direction of Roots blower motor meets the pointing requirements.
Methods for Overall Inspection and Protection and Maintenance of Roots Blower Repair Guangdong Association Blower Association informed us about the protection and maintenance of Roots Blower: Roots Blower should not be installed in a place where people often make payments to prevent injury and scalding. Roots blower shall not be installed in places prone to flammable, explosive and corrosive gases to prevent fire and poisoning.
1. High current
If the sound, temperature and vibration of the mechanical part of Roots blower are normal, but it is dull and the current is high, it is generally because the air inlet and outlet are not good, and the inlet filter, shell ash collection, and outlet pipe valves are not fully opened and blocked.
2. Bearing heating
The bearing heating of Roots blower in operation is mostly caused by bearing damage or poor lubrication and excessive belt tension. If the bearing fails, there must be a sound, which can be easily heard.
3. Abnormal sound of gearbox
The abnormal sound of the gearbox is related to the wear and poor lubrication of the tooth surface. If there is uneven impact, it is the feature of the key or locating pin failure, or it may be the bearing damage or tooth breakage.
4. There is abnormal noise in the machine cavity
If there is friction sound in the cavity, it may be that there is a problem with the positioning of the bearing; In case of impact, the bearing is generally damaged, the impeller center distance has changed, and the impeller side is not parallel to the wall. In another case, foreign matters may be stuck on the impeller, but the probability is not high.
5. The drive belt is abnormal
If the transmission belt is worn and dross falls, it may be that the belt is in contact with the groove bottom, the two belt theories are not parallel or the corresponding grooves are not in the same plane, and the wheels are rough.
6. The fan runs under overpressure due to high current
The fan has large current and overpressure, which is mostly due to the blocked system pipeline; Here, I would like to remind you that the safety valve must be calibrated, overpressure venting is required, and overpressure operation of the fan is strictly prohibited.
Several Key Points for Roots Blower Maintenance
As for Roots blower, it is a relatively sophisticated equipment in the cement industry. Due to its high pressure and hard working characteristics, the shell explosion and collision may occur, which is very dangerous and must be given high attention. Here are some key points that must be grasped in the maintenance of Roots blower.
1. Ensure the smoothness of Roots blower and pipeline
During the maintenance of Roots blower, the parts on the air inlet pipe must be cleaned and inspected; The ash and oil sludge in the casing must be cleaned; Check whether the outlet parts and pipes are unobstructed.
2. The safety valve is flexible, reliable and effective
Because Roots blower is a constant volume fan, if the ventilation is not smooth, the pressure will continue to rise until the motor stops or the casing is damaged. If the safety valve opens naturally under the rated pressure or the allowable set pressure, the above fault can be avoided; In this way, both equipment and personal safety can be guaranteed. 3. The three clearances of Roots blower must be ensured
The three clearances of Roots blower refer to the radial clearance between the rotor and the shell, the clearance between the rotor and the rotor, and the clearance between the rotor side and the shell wall. The installation and maintenance must be carried out in accordance with the relevant maintenance manual. If there is no clear or explicit requirement, the minimum clearance can be calculated according to the following formula.
Radial clearance between rotor and housing: 0.00036D+a, where D is the maximum outer diameter of rotor, in m, and a is the radial clearance of bearing, in mm. Minimum clearance between rotors: 0.00036A+a, A is the center distance between two rotors, in mm, and a is still the center distance between rotors, in mm. The side clearance between the rotor and the wallboard is 0.00036L+b, where L is the length of the rotor, in mm, and b is the axial clearance of the bearing, in mm.
4. Pin positioning is accurate
There are three positions of Roots blower that must be accurately positioned, or the operation of the blower will be affected. The pins of the upper and lower housings and the pins of the gearbox are basically not replaced during maintenance, so only correct installation is required during maintenance. The gear pair is different. When replacing the gear, first install and fix the keyed gear, then install another one, and lock it after it fits well with the joint surface of the other gear. Turn the gear to check the contact condition of the gear surface. If there is no problem, re punch the pin hole and finish reaming, then install the pin, and then turn the gear to check the contact accuracy of the gear. If it is good, the casing and the impeller, and the impeller and the impeller do not rub, That's all right.
5. Installation of pulley
When installing and aligning the belt pulley, it must be ensured that the corresponding belt groove is in the same plane and the error is less than 1.0mm. At the same time, it must be ensured that the belt tightness is moderate, the length of each belt is the same, and the force is the same. The belt should be tightened when the thumb can move down about 15mm by pressing the belt.
I believe that after reading the above contents, you should also understand the key points that must be grasped in the maintenance of Roots blower. I hope it will be helpful to you.
