Blow bar is the core wear parts in the horizontal shaft impactor or impact crusher. Working in very high speed to break the stones and feed stuff down to smaller size, blow bars have to withstand severe abrasion and impact force during the operation. Also, as the feed materials are not always pure and in a controlled size, the condition in crusher is more complicated. As a result, breakage of blow bars happens sometimes in impact crushers which can lead to reduced performance and increased maintenance costs.

(Below is a case of high chrome blow bar breakage caused by tramp iron that was not allowed to feed in)

What could be done to avoid the breakage of blow bars? Here are some steps you can take:

Choose the right blow bars: The right blow bars for your impact crusher will depend on the type of material you are crushing and the operating conditions. Choose blow bars made from high-quality materials that are designed for your specific application. The materials of blow bars include manganese steel, manganese steel with tic inserts, martensitic steel and martensitic with ceramic inserts, chrome white iron and chrome with ceramic inserts.

Check for proper fit: Ensure that the blow bars are properly fitted in the rotor and do not have any wobbling or loose parts. If the blow bars are not securely fastened, they are more likely to break.

Maintain the right feed size: The feed size of the material you are crushing is important to avoiding blow bar breakage. If the feed size is too large, it can cause excessive stress on the blow bars and increase the risk of breakage. Keep the feed size within the recommended range for your impact crusher.

Monitor the rotor speed: The rotor speed of the impact crusher should be carefully monitored and kept within the recommended range. If the rotor speed is too fast, it can cause excessive stress on the blow bars and increase the risk of breakage.

Use the correct blow bar design: Different blow bar designs are suitable for different applications. Choose the correct blow bar design for your application to ensure maximum performance and reduced risk of breakage.

Regularly inspect the blow bars: Regular inspections of the blow bars can help to identify any potential issues before they become serious. Check for cracks, chips, or other signs of wear and replace the blow bars as needed to maintain optimal performance.

Implement a preventive maintenance program: Implementing a preventive maintenance program can help to reduce the risk of blow bar breakage by ensuring that all parts of the impact crusher are functioning properly and are in good condition. Regular maintenance and inspections can help to identify potential issues early and reduce the risk of downtime due to breakage.

By following these steps, you can avoid blow bar breakage and ensure that your impact crusher operates at peak performance.

Also, blow bars are made by steel foundries. A good foundry will not only understand the blow bars on metallurgy basis but also be very familiar with the crushing applications very well. A good foundry will ensure that the blow bars are made in good and reliable quality to avoid any breakage due to quality issue.

Sunwill Machinery is a foundry with over 15 years' experience in the manufacturing and service of blow bars also a leading MMC ceramic blow bars manufacturer in the world. Sunwill Machinery is able to provide various materials suit different applications, also the metallurgists and engineers know how to make the blow bars right for customer's specific applications.