Changing the blow bar is a simple yet essential task to maintain the performance of your impact crusher. A worn-out blow bar can reduce the crushing efficiency and critically affect other parts of the crusher.
In this guide, we explain step by step how to safely and efficiently replace the blow bar, the wear signs that indicate it’s time for a change, and the most common mistakes to avoid.
What is the Blow Bar and What is Its Function?
The blow bar is a key component in impact crushers. Its main function is to strike the crushed material against the impact plates, fragmenting it until the desired size is reached.
Blow bars are made from highly wear-resistant materials, such as chrome-nickel alloys or ceramic inserts with high abrasion resistance.
Why is it Important to Change the Blow Bar?
Worn-out blow bars can cause:
✅ Loss of efficiency: Reduces crushing capacity.
✅ Irregular wear: May damage other machine parts.
✅ Slight variation in the percentages of final products.
It is crucial to monitor the wear of the blow bar to ensure proper maintenance of the crusher.
Tools Needed to Change the Blow Bar
ARJA provides specialized tools with the impact crusher to perform this task safely and in the shortest possible time:
The toolset includes:
🔹 Metal support
🔹 Transfer cart
🔹 Lifting terminal
🔹 Blow bar extraction clamp
Steps to Correctly Change the Blow Bar
1. Stop the Crusher and Secure the Work Area
Before performing any maintenance:
✔️ Completely stop the crusher.
✔️ Disconnect it from the power supply.
✔️ Use the built-in locking system on the crusher.
2. Remove the Worn Blow Bars
🔹 Manually unlock the blow bar using the necessary tools.
🔹 Extract the worn blow bars using the supplied toolset.
3. Install the New Blow Bar
🔹 Insert the new blow bar into its housing.
🔹 Ensure it fits correctly into the supports.
🔹 Inspect the rotor’s condition before installing the new blow bar.
🔹 Secure it properly with the corresponding fastening elements.
4. Perform a Functionality Test
✔️ Before restarting the crusher, ensure the correct gap opening to avoid impact with the blow bars.
✔️ Check that the blow bar rotates correctly and there are no abnormal vibrations.
✔️ Operate the crusher for a short period with the same material to allow the blow bars to settle properly.
If everything is functioning correctly, the crusher is ready to operate at full capacity.
Tips to Extend the Lifespan of Blow Bars
✅ Select the right alloy for the blow bar according to the type of material being crushed.
✅ Ensure proper feeding of the crusher to prevent abnormal wear.
✅ Perform preventive maintenance to detect issues before they affect performance.
✅ Use original spare parts to guarantee compatibility and machine efficiency.
Conclusion
Changing the blow bar in an impact crusher is a key maintenance task to ensure optimal crushing efficiency. By following the correct steps, using the right tools, and conducting regular inspections, you can maximize productivity and reduce downtime.
If you need expert advice on blow bars or spare parts for your crusher, contact our specialists at ARJA, where we offer customized solutions to optimize your crusher’s performance.
