Several key components of vertical mill
Date：2019-11-01 14:33 Source：cementepcViews:
Vertical mill is an ideal large-scale pulverizing equipment, widely used in cement, electric power, metallurgy, chemical industry, non-metallic ore and other industries.It sets crushing, drying, grinding, grading conveying in one, high production efficiency, can be block, particle and powder raw materials into the required powder material.You know, the key components of the vertical mill.
Vertical mill has high efficiency in production, energy conservation, environmental protection, material drying ability strong, stable product quality inspection, wear small, high efficiency, etc. But in the actual production typically has the production and safety issues such as excessive vibration, let's learn about the simple vertical mill's several big functions and maintenance of key parts, in order to better to protect the security of vertical mill production.
1, the roller
For the vertical mill, the roller is the heart of the vertical mill. The roller of the vertical mill is inclined in design, which has two main functions: one is to increase the contact area and improve the grinding efficiency;The second is to prevent large pieces of material from falling off the edge, blocking the air inlet.In addition, with the increase of the grinding time, the grinding roller is gradually worn, which can be used to turn the surface of the grinding roller, extending the service life and saving the cost.
Vertical mill and vibration due to long-term wear, each connection gap get bigger, easy to cause the center of the roller location deviation, can form to pull rod and twisted, on the pull rod torque, intensifying mill vibration, destructive damage to the hydraulic cylinder and the chassis base, and pull rod and pull rod bolt fracture easily.In daily maintenance, we should arrange at least one to two times of planned maintenance according to the production status every year, mainly to test the radial system of the mill and replace worn and aged spare parts.
2. Hydraulic tension system
The hydraulic tension system is one of the most important equipment systems in the vertical mill. It plays a key role in the stable operation of the vertical mill and is also a link prone to failure. The huge grinding pressure exerted by the roller on the material is provided by the hydraulic system.
Generally, the reasons for the failure of the hydraulic system mainly include the damaged fault of the accumulator nitrogen air bag and the frequent start-up fault of the high-pressure oil pump in the hydraulic station. In order to ensure the normal operation of the hydraulic system, the following points should be achieved in production:
(1) the hydraulic fluid in the hydraulic system is required to have a higher degree of cleanliness.In case of small particles into the hydraulic oil, resulting in cylinder scratches, nitrogen balloon damage;
(2) during the use of the hydraulic oil, the oil quality should be tested and checked regularly every half a year, and the hydraulic oil should be replaced in time if the oil is emulsified;
(3) a reasonable grinding pressure should be set according to the characteristics of the material. In normal production, the actual operating pressure should be set between 70% and 90% of the maximum pressure limit.
3. Other key components
In addition to grinding roller and hydraulic tension system, the safe and efficient production of vertical mill also depends on the following key components!
(1) the powder separator can timely select the particles of a certain size in the grinding materials, avoid the occurrence of material aggregation, adhesion to the grinding body and bin, and reduce the over-grinding of the grinding materials;Improve grinding efficiency.Generally, cone concentrator is mainly used for coarse powder selection (conventional powder selection);The movement direction of the impeller of the cage separator is opposite to the direction of the blade tilt, which increases the difficulty of powder selection and improves the accuracy of powder selection. It is mainly used for fine powder selection.
(2) reducer is the heart of the safe operation of the vertical mill. No matter the vertical mill reducer supplied by domestic and foreign manufacturers, it is necessary to detect the meshing of the spiral bevel gear pair by coloring before installation and operation.It is necessary to stop the machine after half a year's operation.In order to ensure the safe operation of the reducer, it is necessary to know the running condition of the gear and bearing of the reducer by checking the oil filter net impurity regularly and cooperating with the endoscopic examination.
(3) the functions of the hot blast furnace are mainly as follows: 1. Reduce the oxygen content of the air in the mill system to prevent explosion; 2.2. Drying materials;3. Pressurize to handle materials with certain humidity.
(4) explosion-proof valve (plastic sheet) is located on the top of the separator. When the pressure in the grinder is too high, the plastic sheet will explode automatically, thus preventing the explosion of inflammable and explosive materials when grinding.
(5) the limiter is a device used for fine-tuning the distance between the grinding roller and the grinding disc, so that there is no contact between the two, to avoid damage caused by contact between the grinding roller and the grinding disc due to uneven cloth vibration during work.