1. Product Introduction
The ball mill rubber liner is a core wear-resistant protective component installed on the inner wall of the ball mill cylinder, the grinding head, the grinding tail, etc. Its main function is to protect the metal cylinder of the ball mill from the impact, scouring and wear of the grinding media (steel balls, etc.) and the material, while optimizing the grinding efficiency and extending the overall service life of the equipment. As a superior alternative to traditional metal liners, it is widely used in ball mill equipment in industries such as mining, metallurgy, building materials, and chemical engineering, especially suitable for wet grinding, fine grinding and corrosive material grinding conditions, and is an indispensable wear and consumable part for the normal and efficient operation of ball mills.
2. The materials used
The selection of materials for the ball mill rubber liner is based on the core principle of "high wear resistance, high impact resistance, corrosion resistance", mainly using natural rubber (NR), synthetic rubber (nitrile rubber NBR, chloroprene rubber CR, chlorosulfonated polyethylene rubber CSM, etc.) as the base material, combined with various functional additives through processes such as mixing, molding, vulcanization, etc. Some high-end products adopt rubber-metal composite structures to further enhance structural stability and service life.
Auxiliary additives
The addition of auxiliary additives is mainly to optimize the performance of the substrate and extend the service life of the liner. The core additives and their functions are as follows (based on the recommended dosage of 100phr blend rubber) :
Types of additives | Specific varieties | Dosage (phr) | Core Function |
Reinforcing agent | Carbon black N330 | 55 | Increase the hardness, wear resistance and tensile strength of the liner, build a wear-resistant network, and enhance the structural stability of the material |
Vulcanization activator | Magnesium oxide (MgO) | 5.0 | The vulcanization reaction adapted to the CR/CSM blend system promotes rubber cross-linking and enhances the overall strength of the liner |
Anti-aging agent | 4010NA | 1.5 | Resistant to thermal oxidative aging, adapted to high temperatures above 50 ° C in summer in mines, and extended liner service life |
Corrosion-resistant additives | Benzotriazole | 2 | Suppress the attack of corrosive media such as sulfide ions on rubber and enhance corrosion resistance |
3. Performance Introduction
The core performance of the ball mill rubber liner is designed around the four dimensions of "wear resistance, impact resistance, corrosion resistance and energy saving", with CR/CSM blend base material and carbon black reinforcement system. The Shore hardness of the liner can reach 65-75D, and the wear resistance is superior to that of ordinary natural rubber liners. Under the same working conditions, the service life is 1.5-3 times that of high manganese steel liners. It can significantly reduce the frequency of liner replacement.
Compared with traditional metal liners, rubber liners for ball mills have significant advantages in terms of wear resistance life, energy conservation and noise reduction, installation and maintenance, especially suitable for wet grinding, grinding of corrosive materials and scenarios with noise reduction requirements for the working environment; Compared with ordinary rubber liners, high-end products have further improved corrosion resistance and impact resistance through material optimization and composite structure design, which can adapt to harsher working conditions and achieve multiple values of "cost reduction, efficiency improvement and environmental protection".
4. Precautions for Use
Before installation, remove debris and rust from the inner wall of the ball mill cylinder to ensure smooth inner wall and avoid foreign objects between the liner and the cylinder, which may affect installation stability and service life; When installing, assemble them in sequence and tighten the fixing bolts to ensure that the liners fit tightly without looseness.
After the liner is installed, run it no-load for 30 minutes to check for looseness, abnormal noise, etc. Only after confirming that there are no errors should it be put into load operation; During the initial operation, the amount of grinding medium should be controlled and gradually increased to the normal level to avoid damage to the liner due to high load impact at the initial stage.
During daily operation, the wear of the liner should be inspected regularly. If it is found that the liner has cracked, broken, fallen off or the wear reaches 70% of the thickness, it should be replaced in time to avoid damaging the ball mill cylinder. At the same time, regularly clean the sticking material on the surface of the liner to reduce material loss and liner wear.
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Rubber Liner of the Ball Mill
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