Coal Vertical Roller Mill2019-01-09

Summary:Failure mode and improvement method of Coal Vertical Roller Mill transmission In Coal Vertical Roller Mill equipment, the transmission is a very important part, regardless of quality, volume or cost factors, it has a great impact on the…

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Coal Vertical Roller Mill

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Coal Vertical Roller Mill Detailed introduction

Failure mode and improvement method of Coal Vertical Roller Mill transmission

In Coal Vertical Roller Mill equipment, the transmission is a very important part, regardless of quality, volume or cost factors, it has a great impact on the normal operation of the Coal Vertical Roller Mill. In practical applications, the transmission device is easily affected by various factors, thereby losing utility and affecting the normal use of the Coal Vertical Roller Mill.

First, the failure mode of the Coal Vertical Roller Mill transmission

In the process of production and use of the Coal Vertical Roller Mill, the transmission device has failed many times. It is found through analysis that the mating surfaces of the large and small gears have pitting, wear and gluing. The tooth surface wears too fast, and the system vibration phenomenon is serious. The failure mode is mainly wear failure, which is characterized by tooth surface wear and wheel. Forms of broken teeth, gluing and plastic deformation. In the repeated equipment maintenance, the causes of the failure of the transmission were sorted and summarized, mainly in the following two aspects:

1. Working environment and lubrication. The working environment and sealing conditions of the Coal Vertical Roller Mill are relatively poor. In operation, the gear will have a certain degree of oscillation after being subjected to a large impact. When the gear lubricating oil is added, the oil is generally introduced into the oiling tank by the worker, and leaks to the gear teeth of the large gear through the gap at the bottom of the oil filling groove, and the lubricating oil is brought to the rodent region by the rotating motion of the large ring gear. In order to control the oil leakage speed, the staff will put cotton yarn on the gap, but there are many problems in this lubrication method, such as the difficulty of ensuring the cleanliness of the lubricating oil, the serious wear of the abrasive grains, the lower safety and the difficulty in refueling.

2. Gear installation and maintenance. The accuracy of the gear installation and daily maintenance have a great impact on its life. Some maintenance personnel did not install according to the relevant specifications when installing the gears, resulting in uneven bearing load of the gear teeth and unreasonable clearance of the meshing gears, which seriously affected the normal operation and service life of the gears. At the same time, the Coal Vertical Roller Mill will generate large vibration during the operation, so that the gear meshing backlash, the counter gap value and other parameters change, if not corrected in time, it will inevitably affect the normal operation of the equipment.

Second, the improved method of Coal Vertical Roller Mill transmission

1. Improve the lubrication system

The failure mode of the Coal Vertical Roller Mill transmission is mainly wear failure. Therefore, the lubrication condition of the gear is very critical to the normal operation of the transmission. Improving and innovating the lubrication system is an effective measure to reduce the failure of the transmission. The way in which the lubricating oil is added should be reformed and changed from the conventional manual lubrication to the automatic fuel injection lubrication. After the improvement, when the lubricating oil is added, the air compressor can be used to spray the high-pressure gas, the gear is cleaned, the dust and the debris attached to the gear surface are removed, and the high-pressure gas and the lubricating oil are thoroughly mixed to form a corresponding high-pressure oil mist, and The method of lubricating the discontinuous spray to the working surface requires the lubricant to adhere to the tooth surface during the operation of the mill. A layer of anti-extrusion and wear-resistant oil film that does not be squeezed out must be formed in the interval between two refueling intervals. Never allow oil accumulation and hardening at the root of the tooth.

2, other aspects

According to the model of the Coal Vertical Roller Mill, gear parameters, etc., and strictly in accordance with the prescribed standards, the gears are purchased to ensure the manufacturing precision and tooth profile accuracy of the purchased gears; the gears should be installed and the diameter of the large ring gear should be completed. The measurement of the amount of runout to the end face, the concentricity of the large ring gear and the cylinder, the value of the counter gap of the large ring gear, etc., and the “pressing lead method”, the meshing backlash of the pinion, the wheel axis and The parallelism of the center line of the cylinder is measured, and after all the qualifications are confirmed, the corresponding trial operation can be performed.

Third, the conclusion

With good maintenance and maintenance, problems in the operation of the equipment can be discovered in time and effectively processed to ensure the safe and stable operation of the Coal Vertical Roller Mill. Therefore, in the actual use process, we should pay full attention to the above problems, analyze the failure mode and failure causes of the Coal Vertical Roller Mill transmission device, and improve it to improve the operation efficiency of the Coal Vertical Roller Mill.

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