What are vertical roller mill practical skills?

The purpose of lubrication management is to prevent equipment lubrication failure, reduce the loss caused by equipment overheating, save maintenance costs and reduce parts replacement, extend equipment life, reduce lubricant consumption, and save the cost of purchasing lubricating materials. Modern machinery and equipment Vertical roller mill is developing in the direction of high precision, high efficiency, high speed, heavy load, small size, maintenance-free and energy saving, which puts higher requirements on the friction parts in Vertical roller mill.

Symptoms and causes caused by lubrication
1 mechanical operation is not working

When the vertical roller mill is running, the movement is delayed, the speed is uneven, the power consumption is large, and vibration, noise, and sometimes the motor will overheat, and the design parameters will not be reached. If the motor power is increased at this time, the mechanical overheating will occur. . Transmission components, such as bearings, belts, gears, etc., will be severely damaged.

main reason:

1 The friction parts are improperly installed or have defects in design. For example, the sliding bearing clearance is too small, and the friction is increased, or vice versa, the clearance is too large, resulting in poor impact and lubrication, resulting in increased friction and unstable motion. If the parts are too large or too small, or the supply of lubricating oil is insufficient, the parts will be poorly lubricated and the operating conditions will be deteriorated. Some of the above conditions are improperly designed, and some are caused by poor processing or assembly.

2 When the material or combination of moving parts is improper, if the lubricating oil is not properly selected, it will cause unstable motion and easily cause seizure and gluing damage.

3 There is foreign matter mixed in. When abrasive solids such as dust sand invade, it is easy to embed the friction pair and hinder the movement. The particles such as dust sand are often 0.2 to 0.8 mm or more and the hardness is extremely high, which not only hinders the operation but also causes significant friction.

4 The wear, seizure, peeling and other damages of the Vertical roller mill parts themselves will deteriorate the movement state, and lubrication is difficult to function.

2 vibration and noise

When the vertical roller mill is in operation, abnormal vibration and noise will occur due to various reasons, so that the performance of the machine is lowered, and the environment is not up to standard. The reason is closely related to the lubrication.

3 temperature is too high

The resistance of the friction pair increases, and the temperature rises rapidly, under the influence of no heat source, such as bearings, gearboxes, etc. When the external temperature exceeds 80 °C, it should be highly noticed. Their internal temperature is several tens of degrees higher than the external temperature and even burnt.

Practical skills for Vertical roller mill lubrication
(1) Rolling bearings. Lubricated rolling bearings should be: select the model; correct installation, adjust the axial clearance, the machining accuracy of the shaft meets the requirements; select the appropriate viscosity of the lubricating oil, and keep the system and lubricating oil clean.

(2) Air compressors are a combination of various Vertical roller mill components, so there are few special differences in their lubrication. Most of these lubrication failures occur because of the low assembly accuracy and the operation technology. Unskilled maintenance techniques, and a considerable part are caused by oil contamination and deterioration and insufficient oil supply.

(3) In order to make the sealing device work under long-term stable conditions, it is necessary to form an oil film on the contact friction surface to play a role of lubrication and sealing. This oil film has a thickness of 1 μm, so the use of tiny damage and deformation on the sealing friction surface can also cause oil leakage, which must be carefully used when installing and installing the seal. O-rings and lip seals and oil seals are made of synthetic rubber. Once the oil leakage causes damage to the machinery and equipment, the conditions of use such as oil properties, pressure and temperature should be carefully checked during use. Wait.

(4) The oil pump is developing towards high pressure, high speed and large capacity, so the lubrication problem of the pump is also very important. For the suitable viscosity of the hydraulic working oil, good high wear resistance and anti-seizure, these must be provided, and for the working oil Pollution prevention management is also very important.

The purpose of lubrication management is to prevent Vertical roller mill lubrication failure, reduce the loss caused by mechanical equipment parking; improve production, save maintenance costs and reduce parts replacement frequency, extend the service life of vertical roller mill, and reduce lubricant consumption. Doing a good job in Vertical roller mill lubrication is an important part of enterprise management and an important way for enterprises to improve economic efficiency.