Ekaterinburg
19, Mashinostroiteley St.
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| Increased durability | Increased productivity |
| 1.3-2.0 times in comparable conditions | 5-20 times for the main sliding bearings |
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| Reducing upgrade time | |
| 10-20 times reduction in modernization time compared to installing a new mill with a similar effective volume |
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| Saving sizes | costs for modernization |
| Maintaining 100% dimensions for the production space and axis of the previously installed mill | 15-25 times reduction in capita |
Non-Trunnion Mills
Key Advantages of Crumin Non-Trunnion Mills
The mill design provides for increased capacity by converting the traditional trunnion design into a larger non-trunnion design, while maintaining the process site dimensions with minimal modification of the mill support foundation pedestals and without changing the main drive foundations (electric motor and crown gear).
The mill drum consists of three parts: the central drum, the feed shell and the discharge shell. This drum design allows replacing the damaged part only, rather than the entire drum, which significantly reduces repair costs and spare part costs for several mills. Two flange connections improve the drum rigidity under working loads, thus improving the drum reliability. Besides, the solid drum machining (machining of bands) is a unique operation that can be performed at a couple of enterprises in the CIS countries, while when the drum is divided into 3 parts, the machining of each part is not unique and can be performed at many machine-building enterprises, which is important for possible repairs.
The segmented bearing design does not require strict axes alignment between the three parts of the drum, since the segments are self-aligning in two mutually perpendicular planes, thereby eliminating edge contacts and maintaining a liquid friction mode that ensures the bearing durability.
The middle part lining layout (of the mill drum) remains the same as in the existing mill, while the shell lining layout is original. The shell/central drum lining joints are made the same way as the drum/feed cover and drum/discharge cover joints at the existing mill, so the wear rate of these elements does not increase
The lining can be either standard (metal) or rubber-metal, which has the following advantages:
- Reduced specific energy costs;
- Easy installation and reduced re-lining time;
- Reduced noise and vibration;
- Elimination of pulp flow under the lining;
- Approximately half the weight of steel liner plating.
The bearings are lubricated from a lubrication unit with two single-mode pressure lines, without a barrier fluid system.
The mill is loaded using a standard method and device (feeder), and the feeder/mill connection dimensions are standard.
CRUMIN Team
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Director General |
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Sergey Alekseevich Chervyakov
Executive Director |
We improve the technologies used by mining companies by applying reliable and cost-effective engineering solutions that help increase the equipment capacity and efficiency.
Our main business areas:
- Modernization of ore preparation technologies
- Design of mining machinery and equipment, reverse engineering;
- Modernization of existing equipment, including imported equipment
- Qualified technical support, including assessment of the mining equipment technical condition (repair scheduling and defect reports).
The solutions offered by our company are successfully used at mining enterprises in the Russian Federation and the Republic of Kazakhstan.
Advantages of Crumin Non-Trunnion Mills
1.5 times
Increase in capacity under comparable conditions
15-25 times
Reduction in capital costs for modernization
10-20 times
Reduction in modernization time compared to installing a new mill with a similar operating capacity
5-20 times
Increased durability of main friction bearings
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