The specific reasons for the failure of the large and small gears of the ball mill are as follows. The large ring gear has radial and end face runout. When we install the large ring gear of the ball mill, since the large ring gear of the mill is fixed on the body with bolts, its end face runout is determined by distribution. The screw holes on the circumference of the large ring gear are adjusted with jack screws. When the end face runout of the large ring gear does not meet the requirements, after the ball mill has been running for a long time, the bolts will loosen and the ring gear will deform, which will easily cause the ring gear to vibrate. , The loose bearing seat of the extension shaft causes pinion vibration. The reasons for pinion vibration of the ball mill include misalignment of the gear shaft and the extension shaft, a large inclination deviation between the center line of the gear shaft and the extension shaft, and loose foundation anchor bolts. Although the anchor bolts are often tightened, But there is still looseness. , The large and small gears are not assembled in place. The meshing of the ball mill pinion gear and the large ring gear is very critical. If assembled properly, the service life of the ball mill large and small gears can be extended and vibration can be reduced. When the large and small gears are installed, the large ring gear has been fixed with the cylinder. At this time, we need to adjust the position of the small gear. It is required that the small gear is parallel to the axial center line of the large ring gear. The tooth top clearance and the tooth side clearance are appropriate. It is easy to be too small. Undercutting occurs, and gears that are too large are prone to tooth breakage. , The end cover leaks slurry, and the pinion wears. The ball mill end cover lining plate is a cast iron blank. Under the impact of materials and ball mill steel balls for a long time, the bolts fixing the ball mill lining plate often loosen, causing the slurry to leak from the end cover bolt hole. , and the transmission ring gear cover is not tightly sealed, so the slurry is easily thrown onto the ring gear, causing the large and small gears to wear too fast, shortening their lifespan, and causing the teeth to break when certain starting forces are high. 2. Low-pressure start of ball mill When we start the ball mill under normal circumstances, the high and low pressure oil suction stations work first, and the high and low pressure oil suction stations work first. When the low-pressure oil pump starts, then the high-pressure oil pump starts. When the pressure reaches ~, the ball mill body floats ~, and the mill can be started at this time. Finally, after the large ring gear and pinion gear are fully lubricated, the mill operates lubricated in a low-pressure state. Due to manual operation or electrical problems, sometimes the high-pressure oil pressure does not reach the predetermined pressure or there is a problem with the high-pressure oil pump oil circuit, forcing the mill to start at a lower pressure. At this time, the bearing bush of the main engine of the mill and the hollow shaft are in a tightly coupled state, and the friction force is large. If the mill is started, not only the bearing bush will be easily scratched, but also the pinion gear will easily break teeth due to the sudden local impact force. , not cranking or the cranking time is not enough. Under normal circumstances, the ball mill must stop feeding the ore to the mill before shutting down, and empty the material in the ball mill barrel with water, otherwise the thick slurry will stick to the inside of the ball mill after drying, increasing the Even so, it is still necessary to start the slow speed drive device for turning before starting the ball mill next time. This will not only form an oil film between the main bearing and the hollow shaft of the ball mill, but also cause the steel inside the mill to The ball material is loose. In this way, the starting load can be greatly reduced when starting the mill. If the ball mill is not cranked before starting, it will easily cause the pinion teeth to break once the ball mill is started. 2. Poor management and lack of maintenance. 2. Frequently used methods to solve ball mill faults and maintenance methods. The edge drive and large gears are one of the key vulnerable parts of the ball mill. Whether the materials selected are suitable and whether the lubrication is good will affect the normal operation of the large and small gears. great influence. In order to ensure that the large and small gears have a high service life and the mill has high working performance, the selection of gear materials and lubrication must be appropriate. , Gear material selection: The damage of edge transmission large and small gears is mainly due to the wear and bending of the tooth surface. Therefore, gear materials are required to have sufficient strength, high wear resistance and good processability. At present, the materials of large ring gears are generally ~, ~, but they must be normalized before processing to reduce the hardness to ~. The pinion is made of materials such as, , and so on. , gear tooth shape and number of teeth. Currently, displacement gears have been used in the design, which can improve the sliding ratio and increase the load-bearing capacity. In addition, gears with multiple teeth and small module are used. It is recommended to use a high meshing angle and a variable tooth profile to improve running stability, reduce mass, cost and tooth root bending stress. , Large and small gear lubrication: There are three forms of lubrication for large gears: oil pump oil lubrication, large ring gear oil lubrication, and oil tanker oil lubrication. Oil pump injection lubrication is not a good method. Since it uses a gear pump to supply oil, the oil can only be thin oil, so it is easy to wear the large and small gears and the oil pump. Secondly, the sealing of the gear cover is not strong enough and dust can easily enter, thus aggravating wear and tear. Furthermore, maintenance is inconvenient. This lubrication method of large ring gear with oil lubrication does not require any additional lubrication equipment, devices and components. The bottom of the large gear cover is used as an oil pool, an oil drain hole is opened, a throttle change valve is installed, and an oil level is added. indicating device. This is the simplest and most commonly used lubrication method, but has the worst lubrication effect. Oil tanker oil lubrication Oil tanker oil lubrication overcomes the shortcomings of oil lubrication of the large ring gear, so it has been applied. The equipment is easy to maintain and there is no oil leakage problem. It is a good lubrication method.
Zhengzhou Huayang Machinery Equipment Co., Ltd.
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