10 Questions You Should to Know about Jaw crusher machine

19 May.,2025

 

5 Common Questions about Jaw Crushers Answered

If you are a rock, sand, gravel or mineral processing industry veteran, you know that there are several different types and styles of crushing equipment. The exact crushers you need—jaw, cone, impact or gyratory—depend on the jobsite, the product you’re making, and how much you need to produce.

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An individual crusher’s construction and capabilities also dictate where in your processing operations it will fit. That is, you may have multiple types of crushers situated in primary, secondary and tertiary stations in a circuit format to perform the necessary material reduction work. Each type of crusher brings unique strengths and benefits to the process.

This article focuses on compression-style jaw crushers, which are most often employed in the primary stage of a crushing circuit. It’s important to know that cone crushers are sometimes used in their place, and we’ll also talk a little bit about when cone crushers may be preferred over jaw crushers. 

What is a Jaw Crusher?

Jaw crushers are sometimes also referred to as “rock breakers,” which speaks to their brute force. They are almost exclusively used as primary crushers because they excel at breaking up some of the largest and hardest materials into more manageable pieces for further reduction by different crushing equipment. Jaw crushers have a multitude of advantages, including:

  • Ability to handle many different types of materials—from hard granite to reclaimed asphalt pavement (RAP) and more—without displaying as much wear and tear as primary impact-style crushers.
  • Typically output minimal fine materials and dust.
  • More efficient than primary gyratory crushers.

Due to their smaller physical size, jaw crushers are also ideal for tight spaces, such as underground mining and mobile crushing applications, where some other primary crushing solutions do not fit.

What are the Different Types of Jaw Crushers? 

Jaw crushers have been around for nearly 200 years and are one of the most “historic” crusher types. Because of this, jaw crushers have undergone many technological advances through the years to become more durable and to improve their movement to reduce choking and increase operational speed. These design tweaks over time have perfected a machine that’s simple enough in its working principle that it may never become obsolete.

Today, two main jaw crusher configurations can be seen from the major equipment manufacturers. They differ based on how the swing jaw moves, though their output is similar.

Double Toggle—Blake Type or Overhead Pivot Movement

Double toggle movement jaw crushers like the Blake style (named for the inventor of the first successful mechanical jaw crusher, Eli Whitney Blake) have long been the standard for crushing hard and abrasive rocks, as well as sticky feeds. These jaw crushers have high energy-efficiency. The overhead pivot design further reduces wear and tear on crusher faces versus the Blake style.

Single Toggle—Overhead Eccentric Movement

More compact than double toggle designs, the single toggle movement jaw crusher was at one time unable to accept such large feed sizes, though it can typically run faster. Technological innovations solved the feed size issue, and now these machines are popular for how quickly they work. They do experience more wear and tear than the double toggle style crushers, but wear parts are widely available and economical.

How Does a Jaw Crusher Work?

Different jaw crusher designs will operate slightly differently, but how they work is similar across the board. All jaw crushers reduce large sized rocks ore, or other materials by a compression action. A fixed jaw, mounted in a V-shaped alignment, is the stationary breaking surface, while a movable, “swing” jaw exerts force on the feed material by pushing it against the stationary plate.

The space at the bottom of the V-aligned jaw plates is the output gap that dictates the size of the crushed product from the jaw crusher. The rock remains in the jaws until it is small enough to pass through the gap.

The video below created by SANDVIK illustrates how jaw crushers operate.


Which are Better: Jaw or Cone Crushers?

While jaw crushers may always be a smart primary crusher stage choice for many operations, it’s true that newer cone crushers are increasingly taking their place due to versatility. Cone crushers and jaw crushers both work by compression, reducing materials by squeezing them until they break apart.

The benefit that cone crushers offer over jaw crushers is their ability to output a more cubical product similar to impact crushers. Cone crushers have traditionally been used as secondary and sometimes tertiary crushing stations.

As far as answering whether one type of crusher is better than another, context is key. Everything comes down to what your production needs and goals are.

How Can I Find the Best Crushers for my Operations?

It’s true that crushers are customizable to help you extract material, break it down into usable product, and get it to market most economically and efficiently. The best way to find the right crushers for your unique operation is to work with a knowledgeable material handling solutions partner like Kemper Equipment.

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The right partner can help you design a custom crushing circuit to boost your productivity and transform your operations.

Top 10 Questions for Crusher and Binder Operator Interview

Top 10 Questions for Crusher and Binder Operator Interview

Are you gearing up for a career in Crusher and Binder Operator? Feeling nervous about the interview questions that might come your way? Don’t worry, you’re in the right place. In this blog post, we’ll dive deep into the most common interview questions for Crusher and Binder Operator and provide you with expert-backed answers. We’ll also explore the key responsibilities of this role so you can tailor your responses to showcase your perfect fit.

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Essential Interview Questions For Crusher and Binder Operator

1. What are the key components of a crusher machine, and what is their role in the crushing process?

  • Feeder: Accepts and distributes material evenly into the crusher.
  • Crusher chamber: Houses the crushing elements (e.g., jaws, rolls) that break down material.
  • Jaw/Roll/Impact assemblies: Apply force to break down material into smaller particles.
  • Discharge chute: Directs crushed material to conveyors or storage bins.
  • Drive mechanism: Powers the crusher’s operation, typically electric motors or engines.

2. Describe the safety protocols you follow when operating a crusher machine.

Pre-Operation

  • Inspect the crusher and ensure it is properly maintained and calibrated.
  • Verify all safety guards and interlocks are in place and functional.
  • Wear appropriate personal protective equipment (PPE), including hard hat, safety glasses, earplugs, and gloves.

During Operation

  • Maintain a safe distance from moving parts and avoid reaching into the crusher chamber.
  • Monitor the crusher’s performance and listen for any unusual noises or vibrations.
  • Be aware of hazards near conveyor belts, electrical components, and heavy equipment.

Post-Operation

  • Turn off and lock out the crusher machine.
  • Clean and inspect the crusher, removing any debris or blockages.
  • Report any issues or maintenance needs to the supervisor or maintenance team.

3. What factors influence the efficiency of a crushing operation, and how do you optimize it?

  • Material properties: Hardness, size, shape, and moisture content of the material being crushed.
  • Crusher type: Jaw, roll, impact, or cone crushers have different capabilities and efficiencies.
  • Crushing settings: Adjusting parameters like jaw gap, roll speed, or impact force can affect efficiency.
  • Feed rate: Controlling the amount of material entering the crusher ensures consistent performance.
  • Maintenance: Regular maintenance, lubrication, and timely repairs maximize crusher efficiency.

4. Explain the role of a binder in road construction and describe the properties of a good binder.

  • Role: Binders hold aggregate materials together, providing strength, durability, and stability to road surfaces.
  • Properties: Good binders should have adequate strength, flexibility, moisture resistance, and resistance to weathering.
  • Types: Common binders include asphalt cement, Portland cement, and emulsions, each with specific properties and applications.

5. Describe the process of calibrating a binder distributor, and what are the key parameters to consider?

  • Calibration involves adjusting the distributor to ensure it applies the correct amount of binder uniformly across the road surface.
  • Key parameters:
    • Nozzle spacing and height
    • Spray pattern width and overlap
    • Application rate (gallons per square yard)
    • Temperature and viscosity of the binder
  • Calibration is typically done using a test strip or by measuring the binder film thickness after application.

6. How do you troubleshoot a binder distributor that is not applying the correct amount of binder?

  • Check for clogged or damaged nozzles.
  • Verify the calibration settings, especially nozzle spacing and height.
  • Inspect the pump and control system for any issues.
  • Calibrate the distributor using a test strip or by measuring the binder film thickness.
  • Consult the manufacturer’s guidelines or seek professional assistance if necessary.

7. What are the best practices for maintaining a binder distributor, and how often should it be serviced?

  • Regularly clean and inspect the nozzles, pump, and control system.
  • Lubricate moving parts and check for any signs of wear or damage.
  • Calibrate the distributor at least once per season or as per manufacturer’s recommendations.
  • Store the distributor in a clean and dry place when not in use.
  • Major servicing should be performed by qualified technicians as per the manufacturer’s schedule.

8. What are the safety hazards associated with operating a binder distributor, and how do you mitigate them?

  • Hot binder can cause burns – Wear appropriate PPE and handle binder with care.
  • Moving parts can cause injuries – Be cautious around belts, gears, and other moving components.
  • Chemical exposure – Wear respirators and avoid contact with hazardous fumes.
  • Fire – Keep extinguishers nearby and follow safe handling practices for flammable materials.
  • Slips and falls – Wear non-slip footwear and be aware of potential tripping hazards.

9. How do you calculate the amount of binder required for a given road project?

  • Determine the area of the road surface to be treated.
  • Calculate the desired binder application rate (gallons per square yard or kilograms per square meter).
  • Multiply the area by the application rate to get the total binder volume required.
  • Consider any additional factors such as traffic volume, weather conditions, or binder type.
  • Always consult with your supervisor or design specifications for accurate calculations.

10. Describe a situation where you successfully identified and resolved a quality issue with a binder application.

  • Observed uneven binder distribution on a road surface during inspection.
  • Investigated the issue and identified a clogged nozzle on the distributor.
  • Cleaned and unclogged the nozzle, ensuring uniform binder application.
  • Recalibrated the distributor to ensure the correct application rate.
  • Monitored the road surface after application to verify the issue was resolved.

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Key Job Responsibilities

Crusher and Binder Operators are responsible for operating and maintaining crushing and binding equipment in the construction industry. They work with a variety of materials, including rock, concrete, and asphalt, to create the materials needed for roads, bridges, and other infrastructure projects.

1. Operate and Maintain Crushing Equipment

Crusher and Binder Operators use heavy machinery to crush and grind materials into smaller pieces. They must be able to operate this equipment safely and efficiently, and they must be able to troubleshoot any problems that may arise.

  • Operate crushers to reduce large rocks into smaller pieces.
  • Monitor equipment for any issues and make necessary adjustments.
  • Perform routine maintenance on equipment to ensure it is in good working condition.

2. Operate and Maintain Binding Equipment

In addition to crushing equipment, Crusher and Binder Operators also operate and maintain binding equipment. This equipment is used to mix and bind materials together, creating the final product that is used in construction projects.

  • Operate binding equipment to mix and bind materials together.
  • Monitor equipment for any issues and make necessary adjustments.
  • Perform routine maintenance on equipment to ensure it is in good working condition.

3. Quality Control

Crusher and Binder Operators are also responsible for quality control. They must ensure that the materials they produce meet the required specifications. This may involve testing materials, making adjustments to equipment, or taking corrective action as needed.

  • Test materials to ensure they meet specifications.
  • Make adjustments to equipment or materials as needed.
  • Take corrective action to resolve any quality issues.

4. Safety

Safety is a top priority for Crusher and Binder Operators. They must be aware of the potential hazards associated with their work and they must take steps to prevent accidents. This may involve wearing protective clothing, following safety procedures, and using equipment properly.

  • Wear protective clothing and equipment.
  • Follow safety procedures.
  • Use equipment properly.
  • Report any unsafe conditions or practices.

Interview Tips

To prepare for an interview for a Crusher and Binder Operator position, it is important to have a strong understanding of the key job responsibilities. You should also be able to demonstrate your skills in operating and maintaining equipment, as well as your knowledge of safety procedures. Here are a few tips to help you ace your interview:

1. Research the Company and Position

Before you go to your interview, take some time to research the company and the position you are applying for. This will help you understand the company’s culture and values, as well as the specific requirements of the job. You can find information about the company on its website, social media pages, and Glassdoor.

  • Visit the company’s website to learn about its history, mission, and values.
  • Check out the company’s social media pages to get a sense of its culture and employee engagement.
  • Read reviews of the company on Glassdoor to learn about the experiences of current and former employees.

2. Practice Your Answers to Common Interview Questions

There are a few common interview questions that you are likely to be asked, such as “Tell me about yourself” and “Why are you interested in this position?” It is helpful to practice your answers to these questions in advance so that you can deliver them confidently and concisely.

  • Prepare a brief introduction of yourself, including your skills, experience, and career goals.
  • Research the company and the position you are applying for so that you can explain why you are interested in the job.
  • Practice answering questions about your experience and qualifications, as well as your strengths and weaknesses.

3. Be Prepared to Talk About Your Experience

The interviewer will want to know about your experience in operating and maintaining crushing and binding equipment. Be prepared to talk about your skills in these areas, as well as your knowledge of safety procedures.

  • Describe your experience operating and maintaining crushing and binding equipment.
  • Highlight your skills in troubleshooting and resolving equipment issues.
  • Explain your knowledge of safety procedures and how you implement them in your work.

4. Be Enthusiastic and Professional

First impressions matter, so it is important to be enthusiastic and professional throughout your interview. Dress appropriately, arrive on time, and be polite and respectful to everyone you meet. Show the interviewer that you are interested in the position and that you are confident in your abilities.

  • Dress professionally and arrive on time for your interview.
  • Be polite and respectful to everyone you meet, including the receptionist and other employees.
  • Show the interviewer that you are interested in the position and that you are confident in your abilities.
Note: These questions offer general guidance, it’s important to tailor your answers to your specific role, industry, job title, and work experience.

Next Step:

Now that you’re armed with the knowledge of Crusher and Binder Operator interview questions and responsibilities, it’s time to take the next step. Build or refine your resume to highlight your skills and experiences that align with this role. Don’t be afraid to tailor your resume to each specific job application. Finally, start applying for Crusher and Binder Operator positions with confidence. Remember, preparation is key, and with the right approach, you’ll be well on your way to landing your dream job. Build an amazing resume with ResumeGemini

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Disclaimer: The names and organizations mentioned in these resume samples are purely fictional and used for illustrative purposes only. Any resemblance to actual persons or entities is purely coincidental. These samples are not legally binding and do not represent any real individuals or businesses.