Mineral Sizer Tooth Plate Replacement Tips And Precautions

Mineral sizers is a crushing equipment specially used in the coal, mining and other industries, its working principle is mainly mineral sizer has two inwardly rotating toothed rollers with replaceable crushing teeth. The most suitable feeding method is by apron feeder or screening equipment,  which conveys the material at a uniform rate and distributes it evenly over the toothed rollers.

1.The mineral is gripped by the leading faces of opposed rotor teeth,and to be subjected to stress under the  concentrated load of the rotor teeth.the stress causes mineral to be break along its natural texture.

2.Mineral is broken in tension by being subjected to a three point loading,  which between the front tooth faces on one rotor and rear tooth faces on the other rotor.

3.For the mineral that has not been fully broken,  through the rotor teeth and fixed teeth of the breaker bar can be further broken to ensure the 3d dimension requirements  of the discharging material.

Mineral sizer’s tooth plate is an important part of its, as a wearing part, the replacement of the tooth plate is an important part of its maintenance work. Before replacing the tooth plate of the mineral sizers secondary crusher, it is necessary to completely stop the operation of the equipment and cut off the power supply to prevent the accidental start of the equipment during the replacement process, resulting in casualties and equipment damage. At the same time, it is necessary to hang a warning sign of “No closing, someone is working” At the power switch, and arrange a special person to take care of it to avoid others sending power by mistake. For example, in a mining enterprise, because the power failure listing system was not strictly implemented, someone mistakenly sent electricity when replacing the tooth plate, resulting in injuries to workers who were working.

In order to ensure the safety of the working area, it is necessary to set up obvious warning signs, pull warning belts, and isolate the working area where the tooth plate is replaced from other production activities to prevent irrelevant personnel from entering. Like some factory workshops, due to the failure to do a good job of safety isolation, other personnel often walk around the working area, increasing the safety risk.

The preparation of spare parts such as the required tools and new tooth plates cannot be neglected. According to the model of the crusher and the installation mode of the tooth plate, prepare the appropriate disassembly and installation tools, such as wrenches, screwdrivers, hammers, jacks, manual hoists, etc., and ensure that the tools are intact and the accuracy meets the requirements. At the same time, prepare the new tooth plate and supporting bolts, nuts, washers and other connecting parts, the material, specifications and models of the new tooth plate must be consistent with the original tooth plate to ensure the performance and crushing effect of the crusher. When preparing tools and spare parts, carefully check the list to avoid omissions, such as an open-pit coal mine in the replacement of tooth plate, due to the omission of some bolts, resulting in the interruption of installation work, delayed production progress.

Before replacing the tooth plate of the mineral sizer secondary crusher, it is necessary to completely stop the operation of the equipment and cut off the power supply to prevent the accidental start of the equipment during the replacement process, resulting in casualties and equipment damage. At the same time, it is necessary to hang a warning sign of “No closing, someone is working” At the power switch, and arrange a special person to take care of it to avoid others sending power by mistake. For example, in a mining enterprise, because the power failure listing system was not strictly implemented, someone mistakenly sent electricity when replacing the tooth plate, resulting in injuries to workers who were working.

In order to ensure the safety of the working area, it is necessary to set up obvious warning signs, pull warning belts, and isolate the working area where the tooth plate is replaced from other production activities to prevent irrelevant personnel from entering. Like some factory workshops, due to the failure to do a good job of safety isolation, other personnel often walk around the working area, increasing the safety risk.

The preparation of spare parts such as the required tools and new tooth plates cannot be neglected. According to the model of the crusher and the installation mode of the tooth plate, prepare the appropriate disassembly and installation tools, such as wrenches, screwdrivers, hammers, jacks, manual hoists, etc., and ensure that the tools are intact and the accuracy meets the requirements. At the same time, prepare the new tooth plate and supporting bolts, nuts, washers and other connecting parts, the material, specifications and models of the new tooth plate must be consistent with the original tooth plate to ensure the performance and crushing effect of the crusher. When preparing tools and spare parts, check the list carefully to avoid omissions. For example, when replacing tooth plates in a cement factory, some bolts are omitted, which leads to interruption of installation work and delay of production progress.

Remove the old tooth plate: Better safe than sorry

After the preparatory work is done, you can begin to remove the old tooth plate. First of all, use the appropriate tools, such as wrenches, sleeves, etc., in accordance with the correct sequence and method, gradually loosen and remove the bolts, nuts and washers that fix the tooth plate. During the disassembly process, attention should be paid to the control of strength to avoid slipping or breaking bolts due to excessive force, increasing the difficulty of disassembly.

In order to prevent the roller from rotating during the disassembly process, a special brake device or a wedge between the roller can be used to fix it. If the tooth roll rotates, it will not only affect the smooth progress of the disassembly work, but also may cause the tool to slip, resulting in injury. For example, in a stone factory, the staff did not fix the tooth roll when removing the tooth plate, and the tooth roll suddenly turned, making the wrench slip and hurt the worker’s foot.

After removing the mineral sizer connector, carefully remove the old tooth plate from the tooth roll. For some heavier tooth plates, it may be necessary to use lifting equipment, such as manual hoists, cranes, etc., for auxiliary disassembly. During the lifting process, the safety regulations of the lifting operation should be strictly observed to ensure the safety and reliability of the lifting equipment, and the connection parts such as hooks and slings should be firm and reliable to prevent the tooth plate from falling during the lifting process. At the same time, the operator should stand in a safe position to avoid being injured by the falling tooth plate. For example, there was once a factory in lifting the gear plate, because the sling wear was not found in time, resulting in the gear plate suddenly falling during the lifting process, smashing the surrounding equipment.

After the old tooth plate is completely removed, the surface of the tooth roll should be cleaned, the residual debris, dust and oil should be removed, and the surface of the tooth roll should be checked for wear, scratches or other damage. If the tooth roller is found to have problems, it should be repaired or replaced in time to avoid affecting the installation and use of the new tooth plate.

When installing the new tooth plate, it should be accurately placed on the predetermined position on the tooth roll to ensure that the installation direction of the tooth plate is correct, the tooth shape of the tooth plate and the tooth shape of the adjacent tooth plate match each other, and the gap is uniform. For example, in the installation process, positioning devices such as positioning pins or positioning holes can be used to ensure the positioning accuracy of the tooth plate. If the installation position of the tooth plate is not accurate, it will not only affect the crushing effect of the crusher, but also lead to the uneven force of the tooth plate and accelerate the wear of the tooth plate.

After determining the position of the new tooth plate is correct, use the appropriate tools and tighten the bolts, nuts and washers fixing the tooth plate in turn according to the specified torque value to ensure that the tooth plate is firmly and reliably installed. In the tightening process, it is necessary to use a diagonal tightening method and tighten gradually for many times to make the tooth plate evenly stressed to avoid deformation of the tooth plate or loosening of the bolt due to uneven stress. For example, when a steel plant installs the tooth plate, it does not operate in accordance with the diagonal fastening method, resulting in excessive force on the bolt on one side of the tooth plate, and the bolt becomes loose shortly after the operation of the equipment. At the same time, the torque wrench and other tools should be used to strictly control the tightening torque of the bolt to ensure that the torque meets the technical requirements of the equipment. If the torque is too small, the tooth plate may be loosened during the operation of the crusher, resulting in safety accidents; excessive torque may cause bolt breakage or tooth plate damage.

The above is about mineral sizers secondary crusher tooth plate replacement of the whole process and important precautions, we are a specialized in crushing and screening equipment and bulk material conveying equipment manufacturers, we engaged in crushing and screening industry for more than 30 years, with a group of experienced professional technical engineer team to provide you with accurate program design and engineering consulting, with advanced processing equipment and strict quality management system and perfect after-sales service system, we warmly welcome you to visit our company.