Tooth Plates

Double Roll Crusher Tooth Plates

Double Roll Crusher Tooth Plates For the Coal Industry

The tooth plate of the double-roll crusher plays a key role in coal crushing operations. It has the advantages of efficient crushing, precise particle size control, strong wear resistance, easy maintenance, strong adaptability and energy saving. It is an important equipment component in the coal processing industry.

Qiming Tooth Plates

Qiming Casting specializes in producing roller crusher tooth plates featuring materials of Mn18Cr6 and bimetal composites. The Mn18Cr6 tooth plates, with their high manganese content, exhibit excellent hardness and wear resistance, making them ideal for crushing hard and abrasive materials. These tooth plates undergo a precise heat treatment process to enhance their mechanical properties, ensuring superior performance and longevity in demanding crushing applications.

Furthermore, Qiming Casting’s bimetal composite tooth plates combine the strength and toughness of a high-quality steel base with the exceptional wear resistance of a hard-facing layer. This innovative design extends the tooth plate’s service life and reduces maintenance costs and downtime. Our bimetal tooth plates are carefully manufactured through advanced techniques such as casting and welding, ensuring a strong bond between the layers and superior resistance to impact and abrasion.

Both Mn18Cr6 and bimetal composite tooth plates offered by Qiming Casting are designed to withstand the rigors of various industrial crushing operations, including mining, quarrying, and construction. With their exceptional durability and reliability, these tooth plates are the optimal choice for enhancing the productivity and efficiency of your crushing equipment.

Mn18Cr6 Tooth Plates

Mn18Cr6 Tooth Plates

Mn18Cr6 steel, with its high manganese content, has unique mechanical properties. This steel typically exhibits work-hardening characteristics after being subjected to impact. Here are some main mechanical properties of Mn18Cr6 steel:

  • Hardness:
    In the softened condition, the hardness is typically below 229 HBW (Brinell hardness).
    The hardness can reach higher levels after heat treatment (such as water quenching), but the specific value depends on the heat treatment process.
  • Tensile Strength:
    It is usually between 600 to 800 MPa.
  • Yield Strength:
    The yield strength is relatively low, which makes Mn18Cr6 steel able to undergo plastic deformation without fracturing when subjected to impact.
  • Elongation:
    It has a high elongation, typically above 30%, indicating good material plasticity.
  • Impact Toughness:
    Mn18Cr6 steel has excellent impact toughness and can absorb much impact energy without undergoing brittle fracture in low-temperature environments.
  • Wear Resistance:
    Due to its high manganese and chromium content, Mn18Cr6 steel is highly wear-resistant, especially under impact and abrasion conditions.

These properties make Mn18Cr6 steel suitable for making components that must withstand high impact and wear, such as crusher tooth plates and excavators’ bucket teeth. However, the specific values of mechanical properties may vary depending on different heat treatment processes and manufacturing standards.

Bimetal Composite Tooth Plates

Bimetal Composite Tooth Plates

Qiming Casting is a leading manufacturer of bimetal composite tooth plates designed specifically for roller crushers. These tooth plates are engineered using advanced materials and techniques to deliver exceptional durability and performance in demanding crushing operations. The bimetallic structure combines a hard, wear-resistant surface layer with a strong and tough base material, providing excellent resistance to abrasion and impact.

  • Hardness:
    The wear-resistant layer usually has a very high hardness. For example, the hardness of high chromium cast iron can reach 58-62 HRC, which helps to resist material wear. The hardness of the matrix material is lower, usually between 200-300 HBW, to maintain sufficient toughness.
  • Tensile strength and yield strength:
    The matrix material provides high tensile strength and appropriate yield strength to ensure that the tooth plate does not fracture when subjected to high stress.
    The specific tensile strength and yield strength depend on the type of matrix material and heat treatment process used.
  • Elongation and impact toughness:
    The matrix material usually has good elongation and impact toughness, which can absorb impact energy and prevent the tooth plate from cracking under impact load. Although the wear-resistant layer is hard, its elongation and impact toughness are relatively low. Therefore, it is necessary to ensure a good bond with the matrix during design to utilize the toughness of the matrix.
  • Wear resistance:
    The wear resistance of the double metal tooth plate is significantly better than that of a single material tooth plate, especially when handling abrasive materials, the presence of the wear-resistant layer greatly extends the service life of the tooth plate.
  • Heat resistance and corrosion resistance:
    Depending on the materials selected, the double metal tooth plate may have certain heat resistance and corrosion resistance, suitable for working in different environmental conditions.

Frequently Asked Questions

The replacement cycle of the tooth plate of the double-roll crusher mainly depends on multiple factors, including the material of the tooth plate, working conditions, the hardness of the crushed material, and the operating time of the equipment. Therefore, the replacement cycle is not fixed, but needs to be judged according to the specific situation. The following are some factors that affect the replacement cycle:

  • Tooth plate material: Different materials have different wear resistance. For example, high manganese steel, alloy wear-resistant steel, and high chromium cast iron composite materials vary in their wear resistance and service life.
    Working conditions: If the double-roll crusher works continuously for a long time or processes, particularly hard or abrasive materials, the tooth plate wear will accelerate, and the replacement cycle will be shortened.
  • Material hardness: The higher the hardness of the crushed material, the greater the wear on the tooth plate and the shorter the replacement cycle.
  • Equipment maintenance: Good maintenance and lubrication can extend the service life of the tooth plate. Regularly checking the wear of the tooth plate and timely maintenance and replacement can ensure the regular operation of the double-roll crusher.

Under normal circumstances, the double-roll crusher’s tooth plate replacement cycle may last between a few months and a year. Regular inspections and assessments based on the equipment’s actual operation and the degree of wear of the tooth plates are recommended to replace the severely worn tooth plates in time to ensure the crusher’s efficiency and stability. You can consult the equipment manufacturer or follow the equipment manual if more specific replacement suggestions are needed.

Roller crushers may encounter various faults during long-term use. Here are some common faults and their solutions:

  1. Material blocking
    Reason: Material humidity is too high, particle size is too large, or feed speed is too fast.
    Solution: Stop the machine to clean the blocked material and adjust the feed speed and humidity.
  2. Roller wear
    Reason: Long-term use causes roller surface wear.
    Solution: Regularly check the roller wear and replace the severely worn rollers in time.
  3. Roller gap adjustment is difficult.
    Reason: The adjustment mechanism may become inflexible due to wear or design problems.
    Solution: Use professional adjustment tools to ensure the gap is set reasonably.
  4. Motor failure
    Reason: Motor overheating, excessive current, etc.
    Solution: Regularly check the motor status, keep it clean and well-ventilated, and repair or replace the faulty motor in time.
  5. Noise problem
    Reason: Equipment imbalance, bearing damage or gear wear, etc.
    Solution: Take sound insulation measures, such as installing sound insulation covers, shock pads, etc.
  6. Bearing heating
    Reason: Insufficient lubrication, severe wear or improper installation.
    Solution: Ensure that the bearings are properly lubricated, and regularly check and replace worn bearings.
  7. Decreased output
    Reason: roller wear, bearing damage or motor failure, etc.
    Solution: Replace worn rollers, repair or replace damaged bearings, and check motor operation.
  8. Excessive vibration
    Reason: roller imbalance, loose foundation or gear wear, etc.
    Solution: Adjust the roller balance, strengthen the equipment foundation, and repair or replace worn gears.
  9. Electrical failure
    Reason: poor motor circuit contact, motor overload or electrical component damage, etc.
    Solution: Check circuit connection, eliminate poor contact problems, check motor load, and repair or replace damaged electrical components.
    Through regular maintenance and inspection, these common faults can be effectively prevented and resolved to ensure the roller crusher’s normal and efficient operation.

1. We will provide a complete dimension report.
2. We make professional inspection tools to check the installation dimensions, such as the dimensions of the dovetail groove.

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