The grinding operation is directly related to the overall processing capacity and economic and technical indicators of the concentrator.
Grinding equipment also accounts for a significant proportion of the concentrator infrastructure investment and production costs.
Energy saving, low consumption and high efficiency have always been the top priorities of the grinding operation of the concentrator.
In terms of equipment manufacturing and innovation, Xinhai Mining Equipment has: two major production plants, more than 200 mineral processing equipment manufacturing workers, equipped with automatic welding manipulators, various types of vertical lathes, gear hobbing machines and other ball mill processing equipment; The professional mining machinery design expert team, focusing on the design and development of ball mills for 20 years, has applied for a number of patents, which can be customized for all aspects of ball mills, so that they can be perfectly combined with the process, improve productivity, reduce energy consumption, and prolong the stable operation time of equipment.
Top 10 highlights of Xinhai mine ball mill
1. A variety of feeding device options
Xinhai Mining has designed three feeding device configurations for the ball mill, including drum feeder, combined feeder and feeding trolley.
Drum feeder
- The material is gradually pushed into the feed port through the spiral plate to achieve forced feeding;
- The specially designed anti-discharge cone effectively solves the problem of material running and leakage;
- It is suitable for use with a single spiral classifier or cyclone, with simple structure, easy to use and no maintenance.
Combined feeder
- Maintain a high level of feeding, no backflow overflow, reduce labor intensity, avoid pollution, and improve efficiency;
- It is suitable for use with double spiral classifiers.
Feeding trolley
- The trolley can move back and forth on the track, and the feeding elbow is directly inserted into the feed port;
- The connecting flange is connected with the feeding device, (silo or feeder);
- The structure is simple and the maintenance is convenient, and this device is suitable for more than 32 large ball mills.
2. A variety of configurations in the feeding section to prolong the service life
3. Automatic welding of the submerged arc of the cylinder, and the inner lining plate protects the cylinder
Cylindrical body
- Thick steel plate welded;
- Automatic submerged arc welding, good quality and beautiful appearance;
- The flanges at both ends are connected with the end covers of the cast steel inlet (outlet).
Liners
- It is installed in the cylinder to protect the inner wall of the cylinder and control the movement of the steel ball in the cylinder.
- High manganese steel (ZGMn13): made of lost foam casting, fast installation speed and high precision;
- High chromium cast iron liners: the mass fraction of chromium is greater than 11%, and the ratio of chromium to carbon content is more than 4.5;
- Rubber lining: made of steel film, vulcanized - styrene-butadiene or natural rubber, Akron abrasion 0.14Cm3/1.6km.
4. Spray lubrication system for large and small gears
Big and small gears
- The large gear adopts a split gear, and the material is ZG310-570 casting;
- The pinion is 45# steel integral forging, the teeth are quenched at high frequency, the manufacturing precision is high, the transmission is stable, the noise is small, and the service life is long.
Spray lubrication system
The main manifestations of mill gear damage and failure are wear, gluing and pitting, and the main reason is caused by poor lubrication, so it is recommended to configure the large and small gear spray lubrication system (ball mills above 27 need to be configured);
Lubrication device specially designed for large and small gears; Spray dry oil or thin oil atomization with compressed air to the bearing tooth surface to form a fine and uniform dry oil layer, which greatly reduces the friction and achieves the effect of energy saving.
5. Rolling bearings replace sliding bearings
The bearing adopts the domestic brand double-row T spherical roller bearing instead of the sliding bearing, and the bearing adopts the labyrinth sealed rolling bearing with linear contact, and the friction is far less than the sliding bearing with surface contact;
For the bearings of each type of ball mill, the stress, displacement, deformation shape and safety factor will be simulated and analyzed to determine whether the bearing model meets the requirements of the ball mill of this specification.
6. A variety of discharging options
Lattice type discharge
It is unique to lattice ball mills, plays the role of forced ore discharge, and is suitable for rough grinding operations or one-stage grinding operations.
Overflow discharge
- The end cover and liner of the discharge part of the overflow ball mill are the same as the feed end;
- The discharge port is made of wear-resistant cast iron;
- Double-ended thrust reverser helix;
1. 将粗颗粒及破碎钢球反推进磨机筒体;
2. Ensure that the discharge particle size meets the process requirements;
3. It is suitable for fine grinding operation or secondary grinding operation.
7. Transmission system with slow transmission system device
Mill drive (asynchronous motor drive)
The asynchronous motor is suitable for transmission below 400kw, and the motor adopts a squirrel cage or wound asynchronous motor with high starting torque.
Synchronous motor drive department
The synchronous motor drive is adapted to the ball mill above 400kw, and the special TDMK low-speed synchronous motor is adopted, which is connected with the pinion shaft through the pneumatic clutch to achieve single-stage deceleration transmission and drive the cylinder to rotate;
Pneumatic clutch for motor-main engine segmented start ("soft start"), improve starting conditions, and play a role in overload protection.
Slow transmission system
The slow drive system can facilitate the maintenance of the ball mill and the replacement of the lining plate; The ball mill was shut down for more than 4 hours, and it was difficult to start due to the material solidification in the cylinder, so the crank was driven at a slow speed before starting the main motor, so that the material was loose and conducive to the start of the main engine.
8. Frequency conversion control cabinet
Frequency sensitive resistor cabinet, frequency conversion cabinet
When the motor is started directly, the output torque of the shaft and the flow rate of the stator change.
When the winding motor is used, the frequency-sensitive starting cabinet or the liquid resistance starting cabinet can realize the step-down start, reduce the impact on the power grid, and change the current and torque of the motor when starting.
Key Benefits:1. The power is reduced by the resistance cabinet to reduce the impact on the power grid at start-up;2. Mechanically, the motor is protected by means of a hydraulic coupling or pneumatic clutch.
9. Hydraulic jacking device
Jacking part: cylinder, feed port, discharge port, convenient maintenance of the mill bearing part is simple, convenient and fast, and the operating cost is low;
The hydraulic jacking device is mainly composed of a hydraulic jack and a hydraulic station system; When the mill is repaired, the hydraulic jack can be lifted up and down by manipulating the handle of the hydraulic station.
10. Equipped with an integral rack
Method 1: For small and medium-sized ball mills, Xinhai Mine adopts an integral frame mill, the whole mill is installed on an integral welding frame, the equipment can be installed and debugged in the factory, and only needs to be put on the basis of pre-laying, find a good level and install it firmly, which greatly reduces the amount of installation work, shortens the construction period, and also facilitates the long-distance transportation of equipment.
Method 2: Non-integral rack installation is suitable for the installation of large mills.
The concentrator equipment is the key to achieving the technical and economic indicators of the concentrator. In the future, Xinhai Mining Equipment will adhere to technological innovation and equipment quality, take strong technical strength as the core competitiveness, take high-quality mineral processing equipment as the quality assurance, and strive to tailor a reasonable process for major mines around the world, so as to create an ideal concentrator landing plan and concentrator equipment!