A Comprehensive Guide to Blow Bar Parts and Spares for Impact Crushers

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Specialized Article: A Comprehensive Guide to Blow Bar Parts and Spares for Impact Crushers

An in-depth look at the types of blow bars, materials, maintenance principles, and increasing the lifespan of blow bars in impact crushers.

Introduction

The impact crusher (Kobit crusher) is one of the most widely used types of impact crushers in the mining and road construction industries, used for crushing medium to hard materials. The blow bar, as the most important and sensitive consumable part of this machine, plays the primary role in the crushing process.

Due to being exposed to severe impacts and continuous abrasion, the parts of the Kobit crusher require periodic inspection and timely replacement. A precise understanding of the types of blow bars, the alloys used, and their maintenance principles is vital for increasing the machine’s lifespan, reducing repair costs, and improving production line efficiency.

In this article, we will comprehensively review the types of blow bars in different models (120, 180, 240, and HS), the metallurgy of the parts, a purchasing guide, and key tips for extending the equipment’s lifespan.

Part 1: Understanding the Structure and Function of the Kobit Crusher

The Kobit crusher consists of a rotor with 2 to 6 rows of hammer plates that rotates at high speed (around 700 rpm). The hammer plates, or Kobit blow bars, are responsible for throwing the feed material (rocks and minerals) towards the inner wall of the crusher (the anvil or side liner of the Kobit crusher).

How it Works:

Raw materials enter the crushing chamber through the feed opening, where the rotor spins at high speed and the Kobit hammers exert strong force on the particles. This impact crushes the rocks and throws them towards the anvils. This second impact completes the crushing process, leading to a reduction in particle size.

Due to its special design and high power in crushing hard rocks, especially in mines, the Kobit crusher can be used as a primary, secondary, and tertiary crusher.

Part 2: Types of Blow Bars Based on Crusher Model

  1. Kobit 120 Blow Bar

    The Kobit 120 blow bar is one of the most commonly used types of blow bars in impact crushers, used in the Kobit 120-ton machine. This machine can produce up to approximately 120 tons of product per hour.

    • Quantity per machine: 12 units
    • Weight per unit: Approximately 63 kg
    • Application: Crushing rocks and producing quality aggregate for use in concrete and asphalt.

  2. Kobit 180 Blow Bar

    The Kobit 180 blow bar is installed in the rotor of the Kobit 180 impact crusher, which has a capacity to process 180 tons of rock per hour.

    • Quantity per machine: 12 units
    • Weight per unit: Approximately 82 kg
    • Weight per set: Approximately 984 kg
    • Special Feature: Arranged in 6 rows facing each other in pairs, increasing torque and crushing efficiency.

  3. Kobit 240 Blow Bar

    The Kobit 240 blow bar is designed for crushers with a capacity of 240 tons per hour. This is the largest Kobit model and is used in massive mining and road construction projects.

    • Quantity per machine: 12 units

  4. Kobit HS7 and HS10 Blow Bars

    The BHS Kobit HS impact crusher is one of the most advanced types of impact crushers designed with the latest technology. The Kobit HS7 blow bar plays a key role in this machine.

    Kobit HS7 Blow Bar:

    • Quantity per machine: 4 units
    • Weight per unit: 109 to 450 kg
    • Electric motor power: 55 kW
    • Rotation speed: 600 rpm
    • Production capacity: 120 tons per hour

    Kobit HS10 Blow Bar: A larger model with higher capacity, used in HS10 crushers.

Part 3: Metallurgy and Material of Kobit Blow Bars

The quality of Kobit spare parts directly depends on their material and manufacturing process. Selecting the appropriate alloy based on the type of feed material directly impacts the blow bar’s lifespan and maintenance costs.

Types of Alloys Used in Kobit Blow Bars:

  1. Manganese Steel

    Manganese steel, with its impact-hardening properties, is used for applications with high mechanical stress.

    • Properties: High impact resistance, suitable for soft to semi-hard rocks.
    • Advantages: More affordable price, high toughness, fracture resistance.
    • Application: Mines with brittle and softer rocks.

  2. Molybdenum Manganese Steel

    This alloy, with the addition of molybdenum, has greater abrasion resistance than regular manganese steel.

    • Properties: Higher abrasion resistance, high toughness.
    • Application: Medium-hard rocks.

  3. Ni-Hard Cast Iron

    Ni-Hard cast iron, with its high hardness and abrasion resistance, performs exceptionally well in conditions of severe wear.

    • Properties: Excellent abrasion resistance, high hardness.
    • Advantages: Long lifespan in abrasive rocks.
    • Application: Mines with hard and abrasive rocks.

  4. High Chrome Cast Iron

    Blow bars made of high chrome cast iron are suitable for crushing very hard rocks due to their high resistance to wear.

    • Properties: Maximum hardness and wear resistance.
    • Important Note: While highly resistant to wear, it has low resistance to fracture and is not flexible.
    • Application: Very hard rocks, with caution.

Important Note on Alloy Selection:

The higher the resistance and hardness of the blow bar in different alloy types, the greater the likelihood of cracks and fractures. Therefore, it is very important to choose an alloy for the blow bar that is suitable for the feed material and does not incur unnecessary costs.

In other words: “Alloys change depending on the hardness and brittleness of the feed material.”

Part 4: Other Important Kobit Crusher Parts

In addition to the blow bar, other parts also play a vital role in the Kobit crusher:

  1. Rotor The rotor is the heart of the Kobit machine. The blow bars are mounted on it, and its rotation causes rocks to be thrown towards the anvils. The rotor must be dynamically balanced to minimize machine vibration.

  2. Kobit Anvil Anvils are the parts towards which rocks are thrown and crushed after hitting the blow bars. Types of anvils include:

    • Adjustable Anvil: Can be adjusted to change the output particle size.
    • Solid Three-Bolt Anvil: A more robust model with higher durability.

  3. Kobit Side Liner Side liners are used to protect the inner wall of the Kobit machine and increase its durability and lifespan. These parts are made of materials resistant to abrasion and impact.

  4. Blow Bar Holder (Hammer Box) The blow bar holder is made of cast iron and has three slots. The Kobit blow bar sits on the holder and moves sequentially through the first, second, and third slots to adjust the distance from the anvil during the blow bar’s life.

  5. Rotor Liner The rotor liner is a curved plate that helps prevent wear on the rotor and protects it from damage.

  6. Kobit Roof The Kobit roof is made of iron, cast iron, or steel and is responsible for securing the roof panels.

  7. Bearing and Pillow Block The bearing protects sensitive parts of the crusher, withstands heavy impacts, and can prevent machine vibration and wear.

  8. Adjustment Bolt This part is located at the back of the Kobit impact crusher. By rotating the adjustment bolt, the pressure in the machine can be increased or decreased, and the output particle size can be adjusted.

Part 5: Guide to Purchasing Kobit Spare Parts

Key Points in Purchasing Kobit Blow Bars:

  1. Source from Reputable Suppliers: Purchase from actual manufacturers, not intermediaries.
  2. Compatibility with Crusher Model: The blow bar must precisely fit the Kobit model (120, 180, 240, HS7, etc.).
  3. Select Appropriate Alloy: Based on the type of feed material and its hardness.
  4. Check Weight and Quantity: Ensure the weight of each blow bar matches the standard (63 kg for Kobit 120, 82 kg for Kobit 180).
  5. Standardized Parts: Compliance with international standards.
  6. Warranty and After-Sales Service: Parts must have a warranty.

Factors Affecting Part Prices:

  • Type of alloy and percentage of constituent elements (manganese, molybdenum, chromium, nickel).
  • Manufacturing process (precision casting, heat treatment).
  • Exchange rates and market conditions.
  • Manufacturer brand.
  • Part weight and dimensions.

Part 6: Maintenance Principles and Blow Bar Replacement Time

Warning Signs for Blow Bar Replacement:

  1. Reduced Blow Bar Height: Over time and due to wear, the height of the blow bar decreases, increasing the gap between it and the anvil.
  2. Decreased Crushing Efficiency: Uncrushed stones passing through the machine.
  3. Increased Energy Consumption: Indicating a problem with the blow bars.
  4. Unusual Noise: Indicating a damaged or loose blow bar.

Adjusting Blow Bar Position in the Holder:

The Kobit blow bar holder has three rows:

  • When the blow bar is new, it is placed in the lowest row of the holder.
  • As the blow bar shortens, it is moved to the middle row.
  • After that, it is moved to the top row.
  • After this stage, the blow bar must be replaced.

Golden Tips for Increasing Blow Bar Lifespan:

  1. Daily Inspection: Check blow bars for signs of wear.
  2. Precise Machine Adjustment: Adjust the distance between blow bars and anvils according to the material type.
  3. Uniform Feeding: Prevent the sudden entry of very large rocks.
  4. Timely Replacement: Before they damage the rotor and other main parts.
  5. Use Appropriate Alloy: Select a blow bar suitable for the hardness of the feed material.

Part 7: Conclusion and Final Recommendations

Kobit Parts Management Checklist in the Mine:

  1. Identify Critical Parts: Blow bar, anvil, rotor, side liner.
  2. Strategic Inventory: Keep at least one set of blow bars (12 units for Kobit 120) in stock.
  3. Scheduled Replacement Program: Prepare a replacement calendar based on operating hours and wear.
  4. Collaborate with Reputable Suppliers: Establish long-term relationships with manufacturers.
  5. Staff Training: Train operators and maintenance personnel for early problem detection.

Concluding Remarks

The Kobit blow bar, as the most critical consumable part in impact crushers, plays a vital role in the efficiency of aggregate production lines and mining industries. Investing in high-quality Kobit spare parts and appropriate alloys is not an expense, but a smart move to ensure production continuity, reduce unscheduled downtime, and increase productivity.

A precise understanding of blow bar types, alloy materials, and maintenance principles is the key advantage for technical managers in today’s industrial competition.

KOBESH MACHINE – Specialized Supplier of Kobit Parts

With over 3 decades of experience in designing and manufacturing crushing equipment, Kobesh Machine is proud to offer various Kobit blow bars and genuine Kobit impact crusher spare parts with the best quality and international standard alloys (Manganese Steel, Ni-Hard, High Chrome Steel) to our customers across the country and the region.

Available Parts:

  • Kobit 120 Blow Bar (Manganese, Molybdenum Manganese, Ni-Hard, High Chrome) – 12 units per set – 63 kg per unit weight
  • Kobit 180 Blow Bar (in various alloys) – 12 units per set – 82 kg per unit weight
  • Kobit 240 Blow Bar – 12 units per set
  • Kobit HS7 and HS10 Blow Bars – 4 units per set
  • Kobit Anvils (Adjustable, Solid, Three-Bolt)
  • Kobit Side Liners for all models
  • Rotor and Rotor Liners
  • Blow Bar Holders (three slots)
  • Genuine Kobit Bearings and Pillow Blocks
  • Special Bolts and Nuts and Adjustment Parts

Immediate Shipping Nationwide and to Regional Countries

Contact Us:

Alipour Brothers – Kobesh Machine

Amir Alipour: +989121943801 Yousef Alipour: +989123657790 Abdolhossein Alipour: +989126614519

Kobesh Machine – Powering Your Production