Technical Features and Working Principles of High Efficiency ultrafine mill Equipment in Shanghai

SHANGHAI SHIBANG MACHINERY CO., LTD is one high-tech enterprise, which involves R&D, production, sales and service as well. In the past 20 years, we devote to producing mining equipments, sand making machines and industrial grinding mills, offering expressway, rail way and water conservancy projects the solution of making high grade sand and matched equipments.

As an indispensable part of the slag cement production process, Shanghai’s high-efficiency ultrafine mill has a very important role in the production of slag cement. However, one of the important equipments in the production process of high-efficient ultrafine mill cement, coupled with its own complexity, therefore, how to effectively debug the high-performance Ultrafine mill is particularly important. This article has carried on the corresponding research to the debugging of the high efficiency ultrafine mill equipment of SBM industry science and technology group, its result may provide the reference for the actual engineering application.

working principle of ultrafine mill

Before the material enters the high efficiency ultrafine mill equipment, the metal material is first extracted to ensure the safe and stable operation of the equipment. The feed material is fed into the disc through the feed tube. When the disc is rotated, the mineral material is dispersed outwards by means of a rotary centrifugal force to form a material bed with a corresponding thickness. At the same time, the mineral material is crushed by many main grinding rollers on the grinding disc and crushed. The crushed material enters the separator along with the hot air. At the same time, the material is dried by the hot air and the moisture quickly evaporates. After passing through the separator, qualified powder enters the precipitator; large particles of powder are sent back to the disc for continued rolling. This is repeated and the entire operation process is completed.

Technical features of ultrafine mill

  • (1) In order to prevent clogging of the ore, feed is usually used.
  • (2) Each of the grinding rollers is equipped with two main rollers and two auxiliary rollers, which are arranged on the grinding disc by a main roller and a auxiliary roller. The main roller and the auxiliary roller play different roles: the former acts as a pulverizer and the latter acts as a fixed material layer.
  • (3) Equipped with tumbler device, the main function is to turn the grinding roller out of the grinding, which is conducive to the post-maintenance.
  • (4) equipped with auxiliary transmission equipment for easy daily maintenance.
  • (5) equipped with a sealed fan, the main role is to seal the roller bearing.

High-performance ultrafine mill equipment debugging

The debugging instruction manual contains the methods, parameter settings and adjustments of the high-performance ultrafine mill equipment during commissioning. The details are as follows:

  • (1) Preparation before starting up
  • 1 Fill the accumulator with a certain amount of gas to bring it to the specified pressure.

    2 Inject dry oil into the bearing as required.

    3 According to the corresponding design requirements, inject suitable oil into the hydraulic station, lubrication station and other equipment.

  • (2) Efficient ultrafine mill equipment single no-load test
  • 1 Start the drag motor, the hydraulic station, and the lubrication station and check that they are turning correctly. As seen from the top, the disc rotates clockwise, while the separator moves counterclockwise.

    2 Adjust the distance between the disc and the main roller. Such as the main roller geometry stroke: the disc plane as a reference surface, the high position is 265.00mm, and the low position is -5.00mm; the main roller working stroke: reference to the grinding disk plane, the high position is 255.00mm, and the low position is 25.00mm.

    3 Adjust the distance between the disc and the auxiliary roller. Such as the auxiliary roller geometry stroke: the disc plane as the reference surface, the high position is 216.00mm, and the low position is -42.00mm; the auxiliary roller working stroke: the disc plane is the reference plane, the high position is 205.00mm, and the low position is 60.00mm; auxiliary roller Installation position: The plane of the disc is used as the reference plane, the distance is 116.00mm; the lower limit stroke of the auxiliary roller is: the plane of the disc is used as the reference plane, the low position is 40.00mm; the auxiliary roller working limit stroke: the disc plane is the reference plane, the high position is 210.00mm , while the low position is 50.00mm.

    4 Start the lubrication station. After 1h to 2h of continuous operation, control the flow rate, pressure, and temperature according to their corresponding specifications or requirements. At the same time, start, stop, and alarm are also controlled, and check if abnormal sound occurs during operation. .

    5 Start the main roller and auxiliary roller hydraulic controller. According to its corresponding specification requirements, it controls the flow, pressure and temperature, and also controls the start, stop and alarm, and checks whether abnormal sound is produced during the operation.

  • (3) Single-machine debugging content
  • The single-machine debugging content mainly includes: First, rotary belt; Second, into the grinding belt; Third, the material valve; Fourth, back material belt; Fifth, the elevator; Six is the iron remover; Seven is the fan; Eight is the dust collector. The above equipment should be able to operate each equipment separately through the central control system.

  • (4) Linkage debugging
  • Linkage debugging means that all system installation, control, chaining, and programs have been completed, and the single-machine debugging also meets the corresponding requirements. When connecting and debugging, pay attention to the difference between the boot sequence and shutdown sequence.

Problems and Handling in the Debugging Process

  • 1, slag performance instability
  • The main reasons for the instability of slag performance are as follows: On the other hand, when the mineral water content is low, the material layer is more difficult to stabilize. Under normal circumstances, this problem can be solved by adding water spray equipment to the belt at the entrance to the grinding mouth; the second aspect is the normal continuous operation of ultrafine mill due to rain. Under normal circumstances, this problem can be effectively solved by adding shelter canopies; the third aspect is that large-grain mineral materials cause ultrafine mill to generate larger vibrations. Normally, a filter can be added before the feeder to screen large-grain minerals and effectively prevent ultrafine mill vibrations.

  • 2, the main roller lubrication oil return is not smooth
  • The poor lubrication of the main roller will cause the shaft exhaust hole to run out of oil. Under normal circumstances, the following treatment methods can be used: First, mobilize the throttle valve; Second, increase the exhaust port; Third, check the pipeline seal; Fourth, increase the oil temperature.

  • 3, product fineness adjustment
  • Product fineness is too small or too small to meet product quality requirements. Under normal circumstances, the following processing methods can be used to make the product fineness meet the requirements: First, check the equipment installation; Second, reduce the air volume; Third, adjust the equipment parameters.

    High-efficiency ultrafine mill is one of the important equipments in the production process of slag cement. Because of its good production capacity, low power consumption, and strong adaptability to mineral materials, the equipment has been widely used in China’s cement industry. Applications.

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