Concrete Mixing Equipment: Aggregate Conveying Equipment Operation and Maintenance Upgrade

In the complete production system of a concrete mixing plant, aggregate conveying is the core hub connecting raw material storage, batching, and mixing. Belt conveyors, idlers, and rollers, as the three key components of the conveying system, bear the crucial function of ensuring the continuous and stable conveying of sand and gravel aggregates. Currently, most mixing plants prioritize production over equipment maintenance. Under long-term high-load, high-dust, and high-wear working conditions, conveying equipment is prone to malfunctions such as deviation, blockage, abnormal noise, and material leakage. These problems not only directly reduce production efficiency, accelerate equipment scrapping, and increase operation and maintenance costs, but may also lead to production stoppages and potential safety hazards. Standardized and meticulous daily maintenance and advanced fault prediction have become the core ways for mixing plants to reduce costs and stabilize production capacity.

Industry operation and maintenance data show that more than 80% of the downtime failures of mixing plant conveying systems stem from insufficient daily maintenance and the neglect of potential hazards in components such as belt conveyors, idlers, and rollers. Idler rollers, as the main load-bearing components of the conveying system, are numerous and widely used, and are also the most easily overlooked vulnerable components. During daily operation, dust and aggregate debris can easily penetrate the idler roller bearings, leading to lubrication failure and bearing jamming. This can cause the idler rollers to stop rotating, produce abnormal noise, and experience accelerated wear. Operation and maintenance personnel should establish a regular inspection mechanism, focusing on cleaning aggregate residue and dust adhering to the idler roller surface, regularly checking the bearing lubrication condition, and promptly replacing jammed, worn, or deformed idler rollers to prevent localized belt wear and tear due to excessive local resistance. Simultaneously, the installation flatness of the idler rollers must be monitored to avoid uneven conveying stress caused by height deviations.

As the carrier of aggregates, the operating condition of the belt conveyor directly determines the conveying efficiency and production continuity. Daily maintenance mainly focuses on four aspects: belt wear, deviation, slack, and cracking. Long-term conveying of sharp sand and gravel aggregates can easily lead to wear on the belt rubber surface, edge tearing, and joint sealant failure. Operators should inspect the belt surface daily, promptly repairing minor damage to prevent potential problems from escalating. For frequent belt deviation faults, the underlying causes can be predicted by observing the belt's running trajectory, such as misalignment of rollers and idlers or uneven material loading. The tracking rollers and tensioning device should be adjusted promptly to accurately correct the belt position. Furthermore, belt tension should be checked regularly to prevent slippage due to excessive slack and fatigue damage due to excessive tension, thus extending the belt's service life.

Rollers are the core power components of a belt drive system. They play a crucial role in power transmission, directional guidance, and tension regulation, and their operational stability directly affects the overall operation of the conveyor system. The key to roller maintenance lies in checking the wear of the surface rubber coating and the protection of the shaft end seals. In high-dust environments, failure of the roller shaft end seals can lead to dust intrusion into the bearings, causing rust, jamming, and abnormal transmission noise. In daily operation, accumulated material and dust on the roller surface should be cleaned regularly, and the rubber coating should be checked for peeling, wear, and cracking. Damaged coatings should be repaired or replaced promptly to prevent belt slippage and uneven stress. Simultaneously, the bearings should be lubricated regularly, and the roller's coaxiality should be checked to prevent system-wide failure due to roller misalignment.

With the development of the concrete industry towards refinement, intelligence, and green practices, improving the quality and efficiency of the entire production chain has become an industry consensus. As a key early-stage process in mixing production, the operation and maintenance level of aggregate conveying equipment directly affects overall capacity, production costs, and operational safety. In the future, refined operation and maintenance and intelligent fault prediction will become the mainstream trend in concrete mixing plant equipment management. Standardizing the maintenance process of core conveying components and establishing fault prediction standards can effectively improve equipment operational stability, reduce unplanned downtime losses, and lay a solid foundation for efficient, low-carbon, and safe production of concrete mixing plants.