The jaw crusher represents an example of a primary comminution equipment used for breaking huge rocks through compression force applied by both the fixed and moving jaw plates (Bogdanovská et al., 2025). Working at full load involves constant crushing of the maximum amount of rock feed designed for the machine, which could be highly dangerous because of excessive vibrations.
The management of heavy machinery starts with the knowledge of the basic terminologies. Jaw crusher refers to a piece of comminution equipment that makes use of the compression mechanism whereby a fixed jaw and a movable jaw are used for crushing large pieces of rocks. Full capacity operation simply implies that the machine is running with the maximum design capacity in terms of feed rate and mechanical loading. The excessive vibration problem denotes any kind of mechanical oscillation beyond normal operational safety levels.
In the process of diagnosing the excessive vibration problem, the initial step requires the identification of its characteristics followed by accurate measurement of its parameters. The problem is characterized by audible rhythmic beating as well as mechanical shakes felt by operators within their working environments. An accurate analysis involves mounting an accelerometer to the machine frame to collect signals of acceleration in both time and frequency domains (Kim et al., 2020). This is because acceleration is the parameter used to measure actual force.
The sources of excessive vibrations during peak operations are typically identified as either mechanical fatigue or operational overloading. From a mechanical perspective, the key sources include deteriorated bearings, extreme misalignment of the eccentric shaft, and imbalanced flywheels. In terms of operations, continuously feeding large rocks into the machine, allowing excessive amounts of fine rock within the chamber, and utilizing improper configurations of jaw plate teeth significantly increase the internal dynamic loads (Bogdanovská et al., 2025). In operation, when the equipment is working at its full potential, any minor problems become immediately noticeable.
A sophisticated diagnostic approach depends on analyzing the frequency spectra obtained from the vibration data. Condition indicators are then used to identify the exact frequencies associated with individual mechanical failure modes. High-amplitude vibrations that precisely coincide with the rotational speed of the shaft are usually indicative of serious imbalance, while high-frequency harmonics are indicative of damaged rolling element bearings. Moreover, combining continuous vibration measurements with other measurements, such as oil temperature, enables a complete diagnostic assessment (Bogdanovská et al., 2025).
However, the solution of such problems requires particular mechanical and operational steps depending on the results of diagnostics. Namely, if any structural defects are discovered, the bearing must be immediately replaced, and the eccentric shaft adjusted together with the re-balancing of the flywheels to ensure kinetic stability. Furthermore, on the operational part, the rock feed should be adequately controlled in order to avoid choking, screen material prior to crushing operations, and apply lubrication as required to minimize friction between parts (Bogdanovská et al., 2025). In addition, the driving frequency of adjacent motors should also be altered to avoid resonant beating (Kim et al., 2020).
To summarize, managing excessive vibration of a fully loaded jaw crusher is an indispensable task in order to maintain the safety of work and optimize the process as much as possible. Through vibration diagnostics and rigorous feed control, engineers can reveal potential faults and solve arising problems in a timely manner to prevent unexpected breakdowns and increase the service life of equipment.
References
Bogdanovská, G., Benková, M., & Bednárová, D. (2025). Analysis of Causes and Consequences of Failures in Process of Andesite Crushing by Jaw Crusher. Processes, 13, 225. https://doi.org/10.3390/pr13010225
Kim, S.-H., Kim, B.-G., Jung, D.-S., Choi, S.-B., Lee, J.-M., & Lee, K.-B. (2020). Vibration Diagnosis of Sand Units in a Stone Crusher Plant: An On-Site Field Test. Applied Sciences, 10, 4327. https://doi.org/10.3390/app10124327
