Impact crushers are heavy-duty machines used to crush large stones and rocks into smaller pieces for further processing. However, while crushing the rocks, it's common to experience rocks coming out of the crusher. This can be dangerous for workers and result in significant damage to the surrounding environment. Here are some tips on how to prevent rocks from coming out of an impact crusher:

1. Properly position the feed chute: The feed chute is the point where the rocks enter the crusher. A poorly positioned feed chute can result in rocks bouncing out of the crusher and causing damage. It's essential to position the feed chute correctly and ensure it's securely fastened.

2. Maintain the appropriate level of lubrication: Lack of lubrication can cause the impact crusher to overheat, leading to the dislodging of rocks. You should ensure that you lubricate the crusher regularly to avoid overheating. Regular lubrication also helps to improve the machine's lifespan and prevents damage caused by friction and heat.

3. Monitor the crushing process regularly: You should frequently check the crushing process to detect any unusual behavior, such as the presence of rocks coming out of the machine. Regular maintenance and monitoring of the crusher help ensure it operates efficiently, and early detection of problems can prevent further damage.

4. Use the correct type of crusher for the job: Each machine is designed to handle specific sizes and types of rocks. Using the incorrect crusher for the job can cause rocks to get stuck or bounce out, leading to damage and safety risks. You must use the recommended type of impact crusher for the rocks you're processing.

In conclusion, the prevention of rocks coming out of an impact crusher entails proper positioning of the feed chute, regular lubrication, monitoring the crushing process, and using the right machine for the job. By following these tips, you can ensure safety and efficiency and prevent damage to the machine and the surrounding environment.