Rod mill

Product Introduction

    Rod mill customer site (coming into production)

    There are two types of rod mills to choose from, dry and wet, but currently all wet rod mills are used. Users can choose according to their actual conditions. Hongxing rod mill manufacturers adopt advanced controllable feeding and discharging technology, combined with the actual grinding materials, and use suitable grinding bodies. The traditional surface contact is changed to line contact, so that the particle size is more uniform and the output is higher. Rod mills are widely used in refractory, chemical, metallurgical, glass and other industries, as well as grinding operations that require relatively high uniformity of finished products after grinding. In recent years, they have also been used in the sand making industry for construction sand.

    Rod mill application

    1. In the heavy or magnetic separation plants of tungsten tin ore and other rare metal ores, in order to prevent the harm caused by excessive crushing, rod mills are often used.

    2. When the two-stage grinding process is used, if the first stage is milled from 20 to 6 mm to 3 to 1 millimeter, and the rod mill is used as the first stage grinding equipment, the production capacity is large and the efficiency is also high. Because the surface area of ​​a rod with a certain weight is much smaller than that of a ball with the same weight, the productivity and efficiency of a rod mill are lower than those of a ball mill in the second stage of fine grinding.

    3. In some cases, it can replace the short-head cone crusher for fine crushing. When processing softer or less hard ore (especially sticky ore), using a rod mill to grind 19-25 mm (or even 32 mm) ore to 6-10 mesh, it is better than using short-head cone crushing The configuration of the machine and the sieve in a closed circuit is simple, the cost is low, and the dust removal in the crushed workshop can be simplified.

    Working principle of rod mill

    When the rod mill is in operation, the motor is driven by the reducer and the surrounding large gears to reduce the speed, or the low-speed synchronous motor is directly driven through the surrounding large gears to drive the cylinder to rotate. A suitable grinding medium-steel rod is installed in the cylinder. The grinding media is lifted to a certain height under the action of centrifugal and frictional forces, and falls in a dropped or leaked state. The material to be ground is continuously entered into the cylinder from the feeding port, and is moved by the moving grinding media. Crush and discharge the product out of the machine by the power of overflow and continuous feeding for the next stage of operation.

    Internal structure of rod mill

    Rod mill performance advantages

     Energy saving

    The characteristic of this machine is that during the grinding process, the grinding medium is in line contact with the ore, so it has a certain selective grinding effect. Compared with the previous old equipment, it can save more than 41% of energy and reduce costs.

     Efficient

    The output particle size of this type of rod mill is more uniform, less over-pulverized ore particles, and higher output.

     Convenient

    The built-in fineness control device can change the granularity of the discharge through simple adjustment, and a screening device can be added when discharging, which can ensure that neither over-grinding nor mixing of unqualified products into the finished product is achieved.

    Common faults and solutions of rod mills

    1. The main bearing is hot, there is abnormal noise, and the motor is overloaded. The reasons may be: ① Poor lubrication ② Sediment entering the main bearing ③ The bearing is broken ④ The main bearing is not installed properly ⑤ The amount of ore is too much or insufficient. : ② Add grease ② Clean bearings and replace grease ③ Replace bearings to adjust the amount of ore.

    2. The power supply of the transmission motor of the rod mill is unstable or too high. The reasons may be: ① the feeder is loose ② the main bearing is poorly lubricated ③ the ore concentration is too high ⑤ the weight of the liner around the cylinder is uneven or the wear is uneven Excessive gear wear: The motor circuit is faulty. The solutions are: ① Tighten the feeder to improve the lubrication condition ② Adjust the operation and replace the liner 3 Replace the repair gear ④ Eliminate electrical faults.

    3. The rod mill has a vibration phenomenon. The reasons may be: ① the gears are not well coupled or worn too much 2 the anchor screws or bearing screws are loose ③ the gearwheel connection screws are loose or the split bolts are loose ④ the transmission bearings are too worn. The solutions are: ① adjust the gear clearance ② tighten the loose bolts ③ replace the transmission bearings.

    4. The rod mill occasionally has a sudden strong vibration and impact sound. The reasons may be: ① foreign objects are mixed between the large and small gears; ② the pinion is loose; ③ the gear is broken; ④ the bearings or the screws on the foundation are loose. ② Eliminate foreign objects ② Replace the gear ③ Tighten the bolts.

    5. The slurry leaks at the joint between the end cap and the cylinder. The reasons may be: ② the connecting bolts are loose. The pins are too long ② the lining board screws are loose. The gasket is worn or the screws are broken. Dowel pin replacement seal.

    6. The motor is overloaded or unable to start when the mill starts. The reason may be: there is no disc grinding during startup. The solution is to start after disc grinding.