enamel pulverizer Interview Questions and Answers

1. What is a hammer pulverizer?

   • Answer: A hammer pulverizer is a type of crusher that uses a series of hammers rotating at high speed to reduce the size of materials. It's suitable for relatively soft and brittle materials and produces a relatively fine product compared to other crushing methods.

2. What are the main components of a hammer pulverizer?

   • Answer: Key components include a rotor with hammers, a casing (housing), a screen, a drive system (motor and gearbox), and supporting structures. Some designs may also incorporate features like a feeder, classifier, and dust collection system.

3. How does a hammer pulverizer work?

   • Answer: Material is fed into the pulverizer where it's struck by rapidly rotating hammers. This impact breaks the material down. The reduced size material then passes through a screen, with oversized particles recirculated for further processing. The finely crushed material is discharged.

4. What types of materials are suitable for hammer pulverization?

   • Answer: Soft to medium-hard, brittle materials are ideal. Examples include coal, limestone, gypsum, fertilizers, and various agricultural products. Materials that are too tough or fibrous are not well-suited.

5. What are the advantages of using a hammer pulverizer?

   • Answer: Advantages include high throughput, relatively low energy consumption per unit of product, ability to handle a wide range of materials (within its limitations), and production of a relatively fine particle size.

6. What are the disadvantages of using a hammer pulverizer?

   • Answer: Disadvantages include potential for high wear and tear on hammers, requiring frequent replacement. It's less effective for very hard or tough materials, and the final product size distribution might not be as precise as with other methods.

7. What factors affect the size reduction achieved by a hammer pulverizer?

   • Answer: Key factors include the speed of the rotor, the number and weight of the hammers, the screen size, the material properties, and the feed rate.

8. How is the particle size distribution controlled in a hammer pulverizer?

   • Answer: Primarily through the screen size. Smaller screen openings lead to finer products. The rotor speed and hammer configuration also play a role.

9. What type of maintenance is required for a hammer pulverizer?

   • Answer: Regular maintenance includes checking and replacing worn hammers, inspecting and replacing screen meshes, lubricating bearings and gearboxes, and ensuring proper functioning of the drive system. Scheduled shutdowns for thorough inspections are also crucial.

10. How can you prevent damage to a hammer pulverizer?

    • Answer: Proper feed rate control prevents overloading, regular maintenance reduces wear and tear, and avoiding materials unsuitable for the machine prevents damage from uncrushable objects.

11. What is the typical lifespan of a hammer pulverizer?

    • Answer: The lifespan varies greatly depending on the usage intensity, material processed, and maintenance schedule. It could range from several years to a decade or more with proper care.

12. How is the power consumption of a hammer pulverizer determined?

    • Answer: Power consumption is dependent on the capacity, rotor speed, material hardness, and throughput. Manufacturers provide power consumption data based on typical operating conditions.

13. What safety precautions should be followed when operating a hammer pulverizer?

    • Answer: Safety measures include lockout/tagout procedures during maintenance, wearing appropriate personal protective equipment (PPE) like hearing protection, safety glasses, and gloves, following operating procedures, and regular safety inspections.

14. What are some common problems experienced with hammer pulverizers?

    • Answer: Common issues include hammer wear, screen clogging, bearing failures, drive system problems, and material bridging in the feed hopper.

15. How is the efficiency of a hammer pulverizer measured?

    • Answer: Efficiency can be assessed by comparing the actual throughput to the rated capacity, analyzing the particle size distribution against specifications, and measuring energy consumption per unit of processed material.

16. What are the different types of hammers used in hammer pulverizers?

    • Answer: Different hammer designs exist, including replaceable hammer tips, solid hammers, and various hammer shapes (e.g., flat, curved) depending on the application and material processed.

17. How is the dust generated by a hammer pulverizer controlled?

    • Answer: Dust collection systems, such as cyclones, baghouses, or scrubbers, are often integrated to capture and remove dust particles from the exhaust air.

18. What is the role of the classifier in a hammer pulverizer?

    • Answer: A classifier separates the fine material from the oversize particles, ensuring a consistent product size and reducing recirculation.

19. How are hammer pulverizers sized?

    • Answer: Sizing is based on the desired throughput (tons per hour), the type of material to be processed, and the required final particle size.

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