I concur with Eugene Vogel's insights on jaw crusher balancing. The compensating weights on the pulley are crucial to minimizing directional vibration caused by the eccentric. It's important to note that altering the size of the weights is unnecessary; rather, their positioning and the careful reassembly of the pulley on the main shaft are key factors to consider. When addressing excessive movement or improper force angles, I recommend utilizing motion amplification or an operating deflection shape analysis to pinpoint the root cause. If issues persist, it may point to improper repairs or reassembly, warranting contractor intervention. For further inquiries or assistance, do not hesitate to contact me. Jim Carrel, CRL-BB, ISO Cat. III COO, Reliability Coach 206-892-8074 Reliability strategies for Every Company www.forumreliability.com
In the realm of reciprocating machinery like jaw crushers, the linear and circular components of motion play a significant role. The linear motion generates a 1xRPM force in a specific plane, as showcased in this illustrative video: https://www.youtube.com/watch?v=3np_Ipw3R-A. Balancing the pulley with compensating weights is crucial for optimal performance. It's worth emphasizing that dynamic balancing of the pulley should not be done independently of the eccentric shaft. For more insights on this topic, feel free to connect with Eugene Vogel.
Hi Eugene, I completely agree with your point regarding the imbalance in the moving jaw and crankshaft of the jaw crusher. In your opinion, do you think it is necessary to balance this equipment on-site? This is a crucial topic to discuss for the efficiency and maintenance of the crusher.
Original Message:
Hi Christian and Jim,
Let's delve into the topic of balancing a jaw crusher. The movement of the jaw involves both linear and circular components, creating a unique dynamic. The animation provided in the link demonstrates this concept effectively. It is essential to consider the compensating weight on the pulley, as it plays a significant role in the overall balance of the equipment. When approaching the balancing process, it is crucial to understand the interconnectedness of the components, such as the pulley and the crankshaft.
Eugene Vogel
On-site balancing of a rotor can be achieved, provided the issue of looseness is addressed first. Spectras revealed a significant looseness problem that cannot be fully rectified through balancing. While balancing may partially reduce the issue, it tends to reappear with increased intensity over time.
It is essential to troubleshoot and address the underlying cause of looseness before attempting to balance the rotor. Jan Krivohlavy, a renowned Vibration Consultant, emphasizes the importance of thorough troubleshooting to ensure long-term balance and functionality of the equipment.
In a recent discussion about jaw crusher balancing, it was noted that the imbalance of the moving jaw and crank shaft may be causing vibrations. Eugene Vogel highlighted the reciprocating nature of the machine and the need for proper balancing techniques to address such issues effectively.
Christian Petroniu sought opinions on balancing jaw crushers after identifying vibrations caused by imbalance. With experience and expertise in the field, it is essential to determine the root cause of the imbalance before attempting any balancing measures to ensure optimal performance and longevity of the equipment.
As per my request, the frame fastening on the foundation needs to be redone. Following this, we will conduct a series of vibration and phase measurements to determine the feasibility of balancing. It was also mentioned in the discussion that balancing such a rotor can be challenging if there is any looseness issue, as indicated by spectral analysis results. While balancing can help partially address the problem, it may not fully resolve the issue, leading to recurring problems with increased intensity.
In the case of a jaw crusher, balancing the equipment on-site can be crucial, especially if there are imbalances in the moving jaw and crank shaft. It is important to troubleshoot any looseness problems before attempting to balance the equipment. Additionally, understanding the nature of reciprocating motion in such machines is essential for effective balancing techniques.
If you have experience with jaw crushers or similar equipment, your input on balancing techniques and the normality of imbalance in their operation would be valuable. Consider the impact of imbalance on the foundation and bearings, and how proper balancing can help prevent further damage. Your insights and opinions are highly appreciated.
Overall, balancing a jaw crusher involves addressing specific challenges related to its design and operation, requiring careful consideration of vibration patterns and potential sources of imbalance. It is crucial to assess the equipment's condition and performance to determine the best approach for achieving optimal balance and reducing mechanical issues in the long run.
Hello Jim, I will attempt to address your inquiries based on information provided by the beneficiary. AQ1: The contractor justified the adjustment of the balancing weights position by stating that, based on their experience, the operation is more efficient in that placement. Please note that the pulley is fixed on the wedge channel and its mounting position cannot be altered. There was no possibility of an incorrect mounting position. Each pulley is equipped with balance weights, estimated to be around 200 kg per pulley. The crusher experienced high vibrations from the initial start-up, resulting in cracks in the casing, bearing destruction, and foundation damage. Given these repercussions, it is believed that the balancing weights may not have been correctly installed during the initial setup. AQ2: If you have reviewed the attached document, you will notice that the vibration primarily occurs at 1TS in the horizontal direction. Phase measurements were not taken. The high values are concentrated on the bearing, with values on the casing and frame being absorbed by the foundation. The purpose of the weights on the pulley is not to balance the pulley itself but rather to balance the machine. A compromise needs to be reached to minimize further damage to the machine under current conditions. This is why your advice is being sought, as someone may have encountered similar situations.
Revolving around the balance, Christian Petroniu
Search engine friendly key terms: crusher balancing, vibration analysis, balance weights, machine efficiency, pulley placement, foundation damage, high vibrations, bearing destruction, balancing techniques, mechanical looseness.
Hello, I am curious about the grout used to secure the base of the unit. I have found that epoxy grout is more durable and long-lasting compared to regular cement grout. Was the base set on the grout and then bolted down to ensure the frame remains aligned? Could you please share a picture of the unit? - Gary Latham
Original Message:
Hi everyone,
I need advice on a problem I encountered with balancing a jaw crusher. Vibration measurements indicate an imbalance issue. If you have experience with this equipment, I would appreciate insights on balancing techniques and whether imbalance is normal during operation. Any feedback is welcome.
PS: The crusher recently underwent repair with new bearings and foundation. Imbalance may have caused mechanical looseness where the frame connects to the foundation. - Christian Petroniu
According to information received, the repair process included replacing all the crusher bearings, removing the old undersized foundation and replacing it with a new one of the same size, replacing the cracked crusher body, and securing the crusher frame to the foundation with bolts fixed using chemical anchors for concrete. However, vibrations were present from the beginning, causing the bolts to be pulled out of the concrete. This suggests a problem with the alignment of the foundation or the feet. To address this issue, shims were suggested to be placed under the feet to compensate for any unevenness in the foundation. The recurring bolt pullouts are a result of the problem, not the cause, indicating a need for a reevaluation of the setup. Balancing the equipment may be necessary to reduce the high vibration amplitudes. Consideration of epoxy grout for a stronger foundation and ensuring proper alignment of the frame are key factors to prevent future issues. A picture of the unit would be helpful for further analysis. Your insights on this matter would be greatly appreciated.
Anchoring plays a crucial role in ensuring the stability and effectiveness of a Jaw crusher. Simply using glued iron threads in drilled holes may not provide the necessary anchoring for optimal performance. Instead, a long anchor embedded through a large concrete piece, secured with specialized chemical glue is recommended. It is important to avoid oiled concrete, use a "net" tube inside the bore to hold the glue, and have the anchoring job done by a skilled professional. The ideal anchor is one that is securely welded or encircled to a strong perpendicular beam within a large concrete base. Calculating the weight and dimensions of the foundation is essential to prevent resonance issues. Additionally, it is crucial to avoid connecting multiple concrete parts as it can lead to problems. To prevent cracks and loosening, ensure the concrete is not freshly poured during machine startup. Once the foundation and anchoring are secure, troubleshooting vibrations can commence. Optimal balancing techniques are necessary to address any vibration issues effectively. Regards, Jan Krivohlavy, Vibration Consultant.
Hello Jan, I completely agree with you that finding a compromise solution or fixing a pre-existing problem is crucial. The issue may stem from inadequate anchoring, as good anchoring is essential for every jaw crusher. The anchoring process must be meticulous and performed by a skilled professional to avoid problems like the pulling out of bolts from the concrete. It is recommended to use a long anchor with special chemical glue, ensuring the concrete is not oiled and using a tube inside the hole to hold the glue. Additionally, the foundation must be calculated properly to avoid resonance issues, with the RPM set well below resonance levels. Interconnecting various concrete parts can lead to troubles, so it is advisable to avoid this approach. Before starting the machine, ensure the concrete is not too young to prevent cracking or loose anchoring. Once the foundation and anchoring are secure, you can proceed with vibration troubleshooting effectively. Balancing the equipment becomes an essential consideration in such cases. Jan Krivohlavy, a Vibration Consultant, also emphasized the significance of proper anchoring and foundation work for optimal performance and stability of the jaw crusher.
In summary, ensuring strong anchoring, proper foundation dimensioning, and expert installation techniques are critical for resolving vibration issues and maintaining the stability of the jaw crusher. Seek professional assistance if needed to address these concerns effectively.
An issue that arises with electric motors is the risk of burnout. When the motor initiates, it demands high voltage, causing the beneficiary to bypass the high voltage motor protection. This abnormal operation is not linked to foundational problems. Finding a compromise solution or addressing underlying issues from the outset is crucial. Proper anchoring is essential for Jaw crushers to prevent issues like vibration. Anchors must be long, secured with special glue, and embedded deeply in concrete for stability. A professional must handle anchoring to avoid future problems. Ensuring proper foundation and anchoring is vital before troubleshooting vibrations. Overlooking these foundational aspects can lead to cracks, loose bolts, and mechanical failures. It is important to prioritize correct anchoring and foundation work before addressing equipment balancing.
- 13-09-2024
- Penelope James
Proper overcurrent and undervoltage protection are essential for preventing motor burnout. Improperly switched off, sized, or set protection devices can lead to disastrous consequences. Skilled electricians, not just vibration specialists, should handle such complex issues. When protection mechanisms trigger, there must be a valid reason, which could include mechanical issues exacerbated by machine vibrations. Troubleshooting these problems remotely is challenging. It's crucial to address foundational problems like anchoring for jaw crushers to prevent motor burnout. Ensuring proper anchoring with strong, well-designed bolts deeply embedded in concrete is key. Foundation dimensioning and RPM calculation should be done accurately to avoid resonance issues. Avoiding early machine startup on young concrete can prevent cracks and structural failures. Once the foundation is secure, vibration troubleshooting can begin effectively to address any remaining issues. It's important to use high-quality epoxy grout for anchoring and ensure the frame is set correctly on the foundation for optimal performance. Ultimately, balancing the equipment may be necessary to address any remaining vibration issues caused by imbalance. Professional guidance and expertise are crucial in tackling such complex machinery problems effectively.
- 13-09-2024
- Yvonne Mitchell
Hello, Jan,
The overcurrent protection is currently disabled because if it is not disabled, the motor will not be able to start the crusher. The jaw is currently in the lower position, and with the protection on, the motor is unable to lift it up. This is a clear indication that the crusher is experiencing severe imbalance.
It is crucial to ensure that the overcurrent and undervoltage protection devices are properly configured to prevent motor burnout. If these devices are not functioning correctly, it can lead to serious issues. This is a task best handled by a skilled electrician rather than vibration specialists. When these protective measures are triggered, there is likely a valid reason behind it, which could be related to mechanical issues causing vibrations within the machine.
Troubleshooting such problems solely through written communication is challenging. It's important to address any underlying issues that may have been present from the start to avoid further complications.
The anchoring of the jaw crusher is another critical aspect to consider. Proper anchoring is essential for the stability of the crusher. Using high-quality anchors, such as those secured deeply within a large concrete base with specialized chemical glue, can help ensure the machine's stability. It is essential to avoid any issues with anchoring as it can lead to vibration troubles.
Foundation dimensioning is a complex task that requires engineering calculations to ensure the stability of the machine. Resonance issues should be carefully addressed, and precautions should be taken to prevent any potential problems. It is crucial to allow the concrete foundation to properly set before starting the machine to avoid any structural issues.
Once the foundation and anchoring are properly secured, it is essential to conduct thorough vibration troubleshooting to address any imbalance issues effectively.
For any further assistance or guidance on balancing the jaw crusher, feel free to reach out. Your input and expertise are greatly appreciated.
Best regards,
Christian Petroniu
Hello Christian, I successfully completed urgent emergency frame-to-concrete re-anchoring using "mortar chemical anchor" and threaded rod. To troubleshoot effectively, proper anchor installation and over-dimensioning are crucial. Seeing images or videos can aid in providing valuable advice, as they provide context that texts cannot fully convey. However, sometimes on-site investigation or testing may be necessary to address issues not captured in visuals. If the base concrete was initially problematic, removing vibrations on site may require advanced work. While it might be possible to dampen vibrations partially, a thorough solution could be challenging and time-consuming. Solid basement and frame anchoring are essential for a successful start, especially for customers dealing with high vibration issues. Finding temporary, quick fixes for weak foundations may not always be feasible. Success often hinges on attention to countless small details that are hard to predict. Enjoy the process!
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Jan Krivohlavy
Vibration Consultant
Regarding the issue of jaw crusher balancing, finding a compromise solution or addressing underlying problems is essential. Proper anchoring is crucial for stable operation of jaw crushers, requiring skilled professionals and strong, well-designed anchors. Factors like concrete quality, anchoring depth, and foundation dimensions play a pivotal role in preventing resonance problems. Interconnecting concrete parts should be approached cautiously to avoid potential issues. Patience and meticulous attention to detail are key to achieving success in vibration troubleshooting. Once the foundation and anchoring are solid, the focus can shift to resolving vibration issues effectively.
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Jan Krivohlavy
Vibration Consultant
During the repair process of the jaw crusher, several critical steps were taken, such as replacing bearings, adjusting the foundation, and fixing bolts with chemical anchors. However, persistent vibration issues indicate potential underlying problems with anchoring or foundation alignment. Addressing these issues may require recalibrating the equipment to ensure optimal performance. Seeking professional advice and thorough analysis can help in resolving these challenges effectively.
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Christian Petroniu
Have you checked for any signs of a bent shaft? I encountered a similar issue with a Hammer type Hog. Original Message: Sent: 9/21/2023 1:29:00 AM From: christian petroniu Subject: RE: Jaw crusher balancing As per the information I received during the repair process, the following actions were taken: - Replacement of all crusher bearings - Removal of the old foundation and installation of a new one of the same size (though, in my opinion, undersized) - Replacement of the crusher body due to cracks in the old one - After pouring the foundation, the crusher frame was placed on it and secured with 3 bolts on each foot, fixed with chemical anchors for concrete. Initially, vibrations were noticed in the crusher and soon after, the bolts were pulled out of the concrete. Despite adding more bolts to the feet with multiple holes in the concrete, the issue persisted. Upon inspection, it appears that either the foundation was not poured evenly or the feet are uneven. I suggested using shims under the elevated feet to align them with the foundation and prevent bolt breakage. The current problem of bolt breakage in the concrete is a result of an underlying issue, not its cause. Even after re-fixing the frame, the vibration levels are expected to remain high. Therefore, the question arises—should the equipment be balanced or not? Unfortunately, I do not have any images of the unit. ------------------------------ christian petroniu ------------------------------ Original Message: Sent: 09-20-2023 12:31 From: Gary Latham Subject: Jaw crusher balancing When setting the base, was regular cement grout or epoxy grout used? Epoxy grout is known for its strength and durability. Was the base placed on the grout before securing it and bolting it down to maintain the frame's alignment? Could you share a photo of the unit? Gary Latham Original Message: Sent: 9/19/2023 3:41:00 AM From: christian petroniu Subject: Jaw crusher balancing Hello all, I need your input on an issue I am currently dealing with. I conducted vibration measurements on a jaw crusher recently, and the analysis suggests that the vibrations may be due to imbalance. If anyone has experience with such equipment, I would appreciate any insights on balancing this machinery. Can it be balanced dynamically like other equipment, or are there specific techniques for balancing jaw crushers? Is some degree of imbalance normal during operation? Should I proceed with balancing, or is this level of imbalance acceptable? Any advice or perspective is valued. PS: The crusher underwent repair involving bearing replacement and foundation reconstruction. This issue may have contributed to the foundation and bearing failures experienced previously. The current mechanical looseness in the area where the frame is fixed to the foundation is likely due to imbalance, in my opinion. ------------------------------ christian petroniu ------------------------------
Hello Nick, the shaft and bearings have been replaced with new components. Phase measurements will be used to determine whether the shaft is bent. I cannot assume the shaft is bent at this time. If you have any questions or need further clarification, please feel free to reach out. Thank you.
Christian Petroniu
Hi Nick, have you confirmed that the shaft is not bent? I encountered a similar issue with a hammer type Hog.
Hello, I would appreciate your input on a current issue. I recently conducted vibration measurements on a jaw crusher and found imbalances. Can this equipment be balanced like others, or are there specific techniques needed? Is it typical for this type of equipment to operate with imbalance? Your thoughts and expertise are valued.
Thank you,
Christian Petroniu
Hello Christian,
When discussing phase vibrodiagnostic measurement, it is crucial to address any looseness issues such as improper anchoring or foundation problems. Resolving this looseness problem should be the first step to ensure the accuracy of your phase measurements. Failure to address this issue may result in inaccurate readings, as looseness significantly affects the phase vector itself.
Jan Krivohlavy, a Vibration Consultant running a self-owned business, highlights the importance of fixing any looseness problems before conducting phase measurements.
In a previous conversation regarding jaw crusher balancing, Christian mentioned that the shaft and bearings are new, and phase measurements will determine if the shaft is bent. It is essential to verify the shaft's condition to address any potential issues with the equipment.
If you have experience with similar equipment, your input on balancing techniques for jaw crushers would be valuable. Understanding the significance of mechanical stability in equipment operation is crucial for maintenance and optimal performance.
Feel free to share your insights and recommendations on balancing jaw crushers in light of recent repairs and foundation reconstruction.
Thank you,
Christian Petroniu
During the initial stages, the frame tightening on the foundation will need to be redone before conducting vibration and phase measurements to diagnose any imbalance issues. Based on my assessment, the most likely cause of the problem is imbalance, although my lack of experience with such machinery prompted me to seek guidance from colleagues on balancing techniques for this type of equipment.
Jan Krivohlavy, a Vibration Consultant, emphasized the importance of addressing any looseness problems related to anchoring or foundation issues before conducting phase vibrodiagnostic measurements. Without addressing these issues, the accuracy of the phase measurements may be compromised.
Christian Petroniu previously mentioned that the crusher had undergone repairs with new bearings and a reconstructed foundation. However, given the presence of vibrations and potential imbalance issues, it raises questions about the necessity of balancing the equipment. Pictures of the unit are not available at this time.
If anyone has experience with balancing jaw crushers or similar equipment, your insights and opinions would be greatly appreciated. The previous repair work and foundation issues may have contributed to the current imbalance and mechanical looseness concerns. Balancing techniques specific to this type of equipment are still uncertain.
To effectively balance this machine for optimal performance, follow these steps: Start by setting up for 2-plane balancing in the horizontal plane and documenting the original amplitude and phase vectors on both sides of the machine horizontally. Then, move the transducers to the vertical plane and record the corresponding amplitude and phase vectors. Next, manually plot these vectors on polar graph paper - one side on each graph labeled as "Oh" and "Ov."
Add a trial weight to the rotor on one side of the machine and record new horizontal and vertical vectors for both sides. Label these vectors as "O+Th" and "O+Tv" and plot them accordingly. Construct the Th and Tv vectors for the side with the trial weight by drawing a vector from Oh to O+Th and from Ov to O+Tv. This will give you a single plane vector solution for both horizontal and vertical components.
If the vector diagrams seem confusing, automatic balancing programs won't suffice. Evaluate if the horizontal and vertical vector diagrams produce similar solutions - if not, the vibration might not be due to rotor imbalance. In case the solutions are similar, proceed with single plane balancing on that side of the machine. If successful, expand to 2-plane balancing using data from both sides.
This process will help determine the cause of vibration issues and provide a strategic approach to achieve balance for optimal machine performance. This method is essential for addressing any imbalance in the machine's operation.
- 13-09-2024
- Heather Coleman
Thank you, Gene, for your valuable recommendation. Once I conduct phase readings and confirm any imbalance, I will proceed to balance the machine using an advanced balancing program to draw amplitude and phase vectors. I plan to follow Jan's advice by utilizing a 4 measuring points and 2 planes balancing program, as well as running a balancing program with 2 measuring points and 2 planes in the horizontal plane simultaneously. After recording trial weights readings, I will determine which program to continue with.
After evaluating the foundation tightening and conducting vibration and phase measurements, I aim to identify the possibility of imbalance causing the issue. With limited experience in this machinery type, I reached out for assistance on balancing techniques.
To effectively address possible imbalance concerns, I will implement a 2 plane balancing setup in the horizontal plane to capture amplitude and phase vectors accurately. By manually plotting vectors on polar graph paper, I can visualize the impact of trial weights on both sides of the machine. Analyzing the vector diagrams will be crucial in determining the approach to balance the machine effectively.
I successfully balanced a reciprocation machine using the Emerson CSI device with 4 channels of measurement (2x vertical + 2× horizontal). The vector averaging algorithm, likely developed in collaboration with Schenck, proved effective for reciprocating machines. Consider using the CSI 2130, CSI 2140, Emerson AMS 2140, or any similar device with advanced field balancing software for troubleshooting and moving the process forward.
As a vibration consultant running my own business, I understand the importance of precise balancing in machines like jaw crushers. When addressing issues like looseness, it's crucial to address the foundation, as it can significantly impact phase vibrodiagnostic measurements. In my experience, addressing foundational issues is the first step in achieving balance and accuracy in measurements.
The key to resolving issues with jaw crushers lies in identifying the root cause, whether it be unbalance, loose components, or other mechanical issues. By conducting phase measurements and ensuring the integrity of the shaft and bearings, it is possible to determine the source of the problem and take appropriate corrective action. It is essential to consider all possible factors contributing to imbalance, such as foundation quality and alignment, to achieve optimal machine performance.
In my recent experience with a jaw crusher, it became evident that the foundational issues were causing vibrations and affecting the overall performance of the equipment. By addressing these foundational concerns and ensuring proper alignment and anchoring, it is possible to minimize vibrations and improve the overall functioning of the machine. Consider using epoxy grout for a stronger foundation and seek professional advice on dynamic balancing techniques for optimal results.
Hello Jan, thank you for your valuable advice. In your experience, is the order and placement of measurement points crucial for balancing a jaw crusher? I have avoided using readings in both directions within the same balancing program. My plan is to utilize channel 1 for the drive end (DE) bearing and channel 2 for the non-drive end (NDE) bearing for horizontal readings, while using channel 3 for the DE bearing and channel 4 for the NDE bearing for vertical readings. Do you think this setup is appropriate, or do you suggest an alternate arrangement of the transducers?
When balancing a reciprocating machine like a jaw crusher, I have successfully used an Emerson CSI device with 4 channels for measurement (2x vertical + 2x horizontal). The vector averaging algorithm, possibly developed in collaboration with Schenck, has proven effective for balancing reciprocating machines. I recommend trying the CSI 2130, CSI 2140, Emerson AMS 2140, or any other device with advanced field balancing software for troubleshooting and progress in balancing.
It is essential, as I mentioned before, to address any issues with the frame tightening on the foundation before conducting vibration and phase measurements to determine if imbalance is the root cause and if it can be rectified. Initial observations suggest that imbalance is the likely culprit, hence my request for assistance on balancing techniques for this type of equipment.
Regarding vibrodiagnostic measurements and concerns about a potentially bent shaft, it is crucial to verify the shaft's condition before proceeding with any balancing efforts. Phase measurements will help determine if the shaft is indeed bent, although this assumption cannot be made without proper verification.
In a previous communication, I provided details of the repair work carried out on the jaw crusher, including bearing replacements and foundation reconstruction to address prior issues. The vibrations observed post-repair indicate a possible imbalance issue, leading to mechanical looseness in the frame-to-foundation connection. Addressing the root cause of these vibrations is essential before deciding whether balancing the equipment is necessary. Your insights and recommendations on this matter are greatly appreciated.
If possible, could you share your thoughts on whether regular cement grout or epoxy grout was used during the base securing process? Epoxy grout is known for its superior strength and durability, which could be beneficial in this scenario. Additionally, ensuring that the frame remains true during the base installation is crucial for the equipment's stability. A visual of the unit would also be helpful for further assessment.
Thank you for your collaboration and assistance in addressing the balancing challenges faced with the jaw crusher. Your expertise in vibration analysis and balancing techniques is invaluable in resolving these issues effectively.
When it comes to balance training, the key point to remember is that the exact measurement location is not crucial; what truly matters is the magnitude of the unbalance vector that you aim to reduce at the specific measurement point. For example, let's consider a scenario where a worker is operating on a slightly unbalanced grinder, resulting in decreased output or product quality. Upon receiving a complaint about vibration and shaking glass, the operator decides to place a sensor on the bearing house. However, they notice that the unbalance vector is very slow at that point. To their surprise, when the sensor is moved to the glass, the vector increases significantly due to the glass's resonance sensitivity. By strategically placing the sensor on the glass, the energy can be reduced by over 70%, which is a substantial improvement compared to balancing based on the bearing house sensor. The key takeaway here is not magic but rather understanding and managing energy levels effectively. Therefore, it is advisable to explore and identify the maximal vector magnitude on your machine, which may sometimes require unconventional sensor placement for optimal results. Remember, what works in one case may not work in another, so it's essential to experiment and determine the most effective approach for your specific situation.
Jan Krivohlavy
Vibration Consultant
Self-Employed
Dear Christian,
Thank you for your query regarding the importance of order and positioning of measurement points. In my experience, the specific order and placement of transducers can play a significant role in achieving accurate balancing results. While your proposed setup with channels 1 and 2 for horizontal readings and channels 3 and 4 for vertical readings seems reasonable, I would recommend considering alternative mounting configurations to ensure comprehensive data collection. For instance, utilizing advanced devices like the CSI 2130 or CSI 2140 from Emerson with vector averaging algorithms can offer enhanced precision, especially for reciprocating machines. Therefore, I suggest exploring various transducer placements and experimenting with different measurement setups to optimize the balancing process effectively.
Best Regards,
Christian Petroniu
Dear Jan,
Your expertise and guidance have been invaluable in addressing the jaw crusher balancing issue. Following your suggestion, I have taken steps to evaluate the foundation tightening and perform vibration and phase measurements to diagnose any potential unbalance. Considering the history of the machine's repairs and the observed vibrations, it is likely that unbalance is a contributing factor to the current problem. As I continue to seek solutions for this specific machinery type, I appreciate your ongoing support and insights in the field of balancing operations for optimal equipment performance.
Warm Regards,
Christian Petroniu
The likelihood of the shaft being bent is high due to the potential high torque of ELM. Improper assembly could also result in bending the frame body with bearinghouse. It is crucial to explore all potential causes by digging deeper into the issue at hand, much like peeling back the layers of an onion to uncover the root problem.
Jan Krivohlavy, a Vibration Consultant operating a self-owned business, highlights the importance of examining each aspect of the equipment to address any underlying issues.
In a recent communication, Christian Petroniu noted the installation of new shafts and bearings, emphasizing the need for phase measurements to determine if the shaft is indeed bent. This step is crucial in diagnosing the problem accurately.
When dealing with similar machinery issues, it is essential to consider factors such as the type of grout used for securing the base and the proper alignment of the frame during installation. Taking these steps can prevent issues such as vibrations and mechanical looseness in the future. Anyone with experience in handling such equipment is encouraged to share their insights on balancing techniques and the impact of imbalance on operational efficiency.
Christian Petroniu seeks advice on the possibility of dynamically balancing the jaw crusher to address vibrations caused by imbalance. The recent repairs conducted on the equipment, including bearing replacements and foundation reconstruction, hint at potential recurring issues that may need to be resolved through proper balancing techniques. Your input and expertise are valuable in resolving this equipment-related concern.