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Installation requirements for ball mill liner

Date:2019-06-05 14:13     writer:cement editor     Views:

  The inner surface of the ball mill cylinder is generally provided with liners of various shapes. The lining plate is the main wearing part of the ball mill, and its use cost is about 2%-3% of the price of the product. The performance and service life of the lining plate are issues that users are very concerned about. The performance of the liner will directly affect the performance of the ball mill. This article describes the three functions of the ball mill liner, 8 classifications and 10 installation requirements.

  3 functions, 8 classifications and 10 installation requirements of the ball mill liner, quickly collect it.

  Liner function

  The materials for the lining are made of metal materials (manganese steel, chrome steel, etc.) and rubber. At present, there are many domestic metal material linings, and rubber linings are also widely used in mines. The lining mainly has the following functions:

  1. Protect the cylinder and strengthen the cylinder stiffness

  The cylinder is an important part of the ball mill, and the price is relatively expensive. After the liner is installed in the cylinder, the cylinder does not directly withstand the impact and grinding of the grinding medium and the material to be ground, thereby protecting the cylinder and extending the cylinder and the whole. The service life of the equipment. The lining and the cylinder are tightly combined to enhance the rigidity of the cylinder.

  2, transfer energy

  During the rotation of the cylinder, the ball is lifted to a certain height by means of the special shape and friction of the surface of the lining, giving it a certain amount of potential energy and throwing kinetic energy, so that they produce an arc corresponding to the grinding process requirements. A parabola" trajectory, impact and abrasive material.

  3.automatic grading sphere

  Automatic grading linings such as angle spiral linings, tapered grading linings, etc., can make the grinding bodies of different grades in the cylinders reasonably positively grade along the axial direction of the mill according to the change of grinding grain size, thus making various Abrasive bodies of different diameters play the most important role in the process of pulverizing the corresponding particle size materials. In other words, the automatic grading liner can gather larger steel balls in the same grinding chamber at the feeding end of the hopper to smash larger blocks while collecting smaller steel balls at the discharge end of the hopper. Crush smaller blocks.

  Classification of liners

  The shape of the ball mill liner is divided into 9 shapes according to different requirements, namely wedge shape, wave shape, flat convex shape, flat shape, step shape, long strip shape, rudder shape, K-shaped rubber liner and B-shaped rubber lining. Board (as shown below).

  (1)A flat lining is used for the fine grinding bin, and the rising height of the grinding body depends on the coefficient of static friction with the tree slab.

  (2) The bead lining plate is used for the first bin to enable the grinding body to rise higher and has a larger impact energy.

  The 3 rib liner is similar to the bead liner.

  (4)Wave liners for baseball mills.

  (5)The 5 step liner is suitable for crushing warehouses and is widely used. Has the following three advantages:

  a) The height of the lifting of the same sphere is uniform.

  b) Uniform wear on the surface of the board.

  c) The pinning capacity of the liner acts on the abrasive bodies of the other layers, reducing the sliding wear between the liner and the outermost abrasive body, and also preventing sliding and abrasion between the different levels of the abrasive bodies.

  (6)Hemispherical lining for smashing bins.

  (7)Corrugated lining, boltless lining for fine grinding, with small peaks and tightness.

  (8)Graded lining, which can automatically grade steel balls.

  The shape of the barrel liner has a great influence on the work of the ball mill. When handling coarse-grained materials, the lining of the ball mill cylinder should be undulating (such as wave shape, convex shape, lap shape and stage shape). This shape liner has the ability to raise the grinding media to a higher height, thereby enhancing the impact of the medium and increasing the productivity of the ball mill. Commonly used in the first stage of grinding.

  Fine grinding (often referred to as the second stage of grinding) is mainly by grinding and stripping. The smooth-shaped lining is easy to slide the steel ball, and the grinding and peeling action is strong, so the fine-grinding ball mill cylinder adopts a smooth lining.

  3 functions, 8 classifications and 10 installation requirements of the ball mill liner, quickly collect it.

  Liner installation requirements

  The backing lining of the lining installation and the end cover of the cylinder shall be filled with a compressive strength grade of 43.5 MPa cement mortar.

  The bolts on the fixed end lining shall not allow the cement mortar to be filled and shall be able to rotate or enter.

  The lining is generally directional, so be careful when installing it.

  The arc length of all circumferential gaps shall not exceed 310 mm, and the excess is wedged with steel plates to cut them off.

  The gap between adjacent liners is not more than 3~9mm.

  The partition between the lining plate and the inner surface of the cylinder shall be laid according to the design requirements. If there is no requirement, the compressive strength grade 42.5MPa cement mortar may be filled between the two, as full as possible, and the excess part is extruded through the strong lining bolt. After the cement mortar is solidified, tighten the liner bolts again.

  When the rubber backing plate is installed, the rolled rubber sheet is opened for 3~4 weeks before installation to make it free to extend; when the rubber sheet is used, the long side of the rubber sheet is followed by the axial direction of the cylinder. The short side follows the circumferential direction of the cylinder.

  Carefully check the geometry of the lining bolt holes and lining bolts, carefully clean the lining bolt holes and the burrs, burrs, and protrusions on the lining bolts so that the bolts can freely penetrate into the required position.

  The complete set of lining bolts shall be composed of glaring bolts, dustproof washers, flat washers, spring washers and nuts; to prevent ash leakage, do not forget to use the dustproof mat when using.

  When tightening the lining bolts, use a torque wrench to work. The lining bolts of different specifications should be tightened according to the corresponding tightening torque requirements.

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