Mill is one of the main equipment in feed factory producing feed, normal operation, direct the production efficiency and the reliability of the mill running behind the process so that the maintenance and operating personnel to analyze and deal with the mill system, and shall be excluded in the short term, to resume production as soon as possible, it is not an important matter. The mill system mainly comprises a crusher and an electric motor. The corresponding fault can be divided into mechanical fault and electrical fault. The following is the mechanical failure and vibration, bearing heating and mill plug and other faults into the analysis.
1, vibration mill is generally used motor directly connected to the grinding device, this connection is simple, easy to repair. But if the assembly process can not be a good connection between the two, it will cause the overall vibration of the mill.
(1) the motor rotor is not concentric with the rotor of the mill. Can move left and right position of the motor, or on foot pad is added below the motor, to adjust the concentricity of the two rotor.
(2) the mill rotor is not concentric. The reason is that the 2 supporting surfaces of the supporting surface of the supporting rotor shaft are not in the same plane. In the bearing seat bottom surface of the copper pad, or increase the wedge adjustable bearing in the bottom, by 2 concentric shaft guarantee.
(3) the partial vibration of the grinding room is larger. The reason is that the coupling of the coupling and the rotor is not concentric or the quality of the flat hammer in the rotor is not uniform. Join can take the appropriate method to adjust the coupling with the motor according to the different types of couplings: when the hammer of uneven quality, must be re matching each hammer, the hammer is symmetrical, the hammer symmetry error less than 5G.
(4) the original balance is destroyed. After the motor is repaired, the dynamic balance test must be done to ensure the overall balance of the machine.
(5) mill system anchor bolt loose or solid foundation, in the installation or maintenance, evenly fastening bolt, between foundation and mills, to reduce the vibration damping device.
(6) the hammer pieces are broken or shattered and there are hard objects in the room. These can cause the unbalance of the rotor rotation, and cause the vibration of the whole machine. Therefore, to check regularly, for wear and tear of the hammer. In the replacement, to replace the symmetry; the operation of the mill appears abnormal sound, to immediately stop the inspection, to find the reasons for the timely processing.
(7) the connection between the mill system and other equipment is not consistent. For example, feeding tube, discharge tube, such as improper connection, will cause vibration and sound. Therefore, the connection part, should not use hard connection, it is best to use soft connection.
2, bearing overheated bearing is a more important parts of the mill, its performance directly affects the normal operation of the equipment and production efficiency. Equipment operating process, the user should pay special attention to the temperature of the bearing and bearing parts of the noise, there is an exception to the early treatment.
(1) the level of the 2 bearing seats is uneven, or the motor rotor is not concentric with the rotor of the mill, so that the shaft can bear the impact of additional load, thereby causing the bearing to overheat. In this case, to immediately stop troubleshooting, to avoid bearing early damage.
(2) bearing lubricating oil too much, too little or aging is caused by bearing overheating and damage to the main reason, therefore, according to the use of the book requirements on time quantitative filling of lubricating oil, lubricating bearing space accounted for 70% - 80%, too much or too little is not conducive to the bearing lubrication and heat transfer. Bearing to extend its service life.
(3) with the tight cover and the shaft bearings, bearing and shaft fits too tight or loose will lead to overheating of bearing. However, this problem occurs, in the operation of the equipment, it will issue a friction sound and obvious swing. Should stop and remove the bearing. Trim parts of friction, and then re assembly as required.
3, crushing mill plug is one of the common failures in the use of the mill, there may be problems in the design of equipment, but more due to improper operation caused by the use of.
(1) the feeding speed is too fast, the load is increased, resulting in blockage. In the process of feeding, pay attention to the current table pointer deflection angle, if exceed the rated current, that motor overload long time overload, will burn out the motor. This situation should immediately reduce or close the discharge door, can also change the feed way, by increasing the feeder to control the feeding amount. The feeder is a manual, automatic two, users should choose the right feeder according to the actual situation. As a result of high speed, high load, and a strong load fluctuations. Therefore, the current control of the mill is generally controlled at about 85% of the rated current.
(2) the discharge pipe is blocked or clogged feeding too fast, will make the mill outlet plug; and conveying equipment, improper discharging pipeline wind weakened or blocked after calm. Find out the fault, should first send clear export transportation equipment, do not change, adjust the feeding amount, the normal operation of equipment.
(3) the hammer pieces, aging, screen hole closed, rags, crushing the material moisture content is too high will make the mill jam. Should be regularly updated and broken aging hammer crusher, to maintain a good working condition, and regularly check the screen, water material crushing rate should be lower than 14%, it can improve the production efficiency, and the mill is not blocked, enhance reliability of mill work. You are responsible for you of the consequences of the news, so please obey the law and pay attention to the language of civilization.