Core Accessories for Belt Conveyors: Structural Principle and Intelligent Technology Upgrade of Belt Cleaners

        Belt conveyors are core equipment for bulk‑material transportation in mines, ports, power plants, and chemical plants. Featuring continuous, high‑efficiency and stable conveying performance, they have become the mainstay of industrial bulk‑solid logistics.

        Within a complete belt‑conveyor system, besides key components such as pulleys, idlers, conveyor belts and drive units, belt cleaners are critical functional parts ensuring long‑term stable equipment operation and reducing maintenance losses, yet they are often overlooked. During belt operation, residual substances including coal slime, ore dust, clay and fine dust particles adhere to the belt surface. Without timely cleaning, these residues will trigger a series of problems: belt misalignment, pulley material buildup, idler abrasion, material     spillage and accumulation. These issues not only increase equipment failure risks, but also cause material waste and pollute the working environment. This article comprehensively analyzes the core technical logic of belt cleaners from the dimensions of structural composition, working principles, mainstream product types, technical advantages and iterative upgrades.

1. Core Functions and Industrial Value of Belt Cleaners

        Belt cleaners are special devices designed for cleaning conveyor‑belt surfaces. Their core function is to thoroughly remove residual materials adhered to both the carrying and return sides of the belt, realizing clean‑operation of the closed conveying loop.

        Their industrial value covers three dimensions: equipment maintenance, production efficiency, safety and environmental protection. First, they eliminate hidden hazards such as belt misalignment, local abrasion and tearing caused by carryback residues, greatly extending the service life of key accessories including conveyor belts, pulleys and idlers. Second, they prevent material spillage and accumulation on the return belt, reduce on‑site dust and material loss, and cut manual cleaning costs. Third, they stabilize equipment operating conditions, reduce failures such as material blockage and jamming, improve the overall conveying efficiency of belt conveyors, and meet the demands for continuous and intelligent industrial production.

2. Complete Structural Composition and Component Functions of Belt Cleaners

        Modern industrial‑grade belt cleaners adopt modular integrated design, with precise overall structure, convenient assembly & disassembly and strong adaptability. The full set consists of four major modules: core cleaning assembly, tension‑adjustment assembly, fixed‑support assembly, and drive‑transmission assembly. Coordinated operation of all components guarantees cleaning accuracy and operational stability.

    (1). Core Cleaning Assembly: Core Execution Unit

        This assembly is the core part making direct contact with the conveyor belt to remove materials. Depending on cleaner types, it is divided into blade assembly and brush assembly. Material selection directly determines cleaning performance and service life.

        For blade‑type belt cleaners, the key parts are cleaning blades. Mainstream materials include polyurethane, hard‑alloy and wear‑resistant rubber. Polyurethane blades are widely used currently. They feature high elasticity, superior wear resistance and belt‑friendly properties. They can closely fit the curved belt surface and suit cleaning for various wet and dry materials. Hard‑alloy blades possess extreme rigidity and work on the “rigid cutting” principle. They deliver excellent cleaning performance for high‑viscosity and hard caked materials with cleaning efficiency above 90 %. Rubber blades have better flexibility, suitable for light dust and fine‑particle cleaning with higher fault tolerance. Nowadays the segmented modular‑blade design is widely adopted in the industry. Worn single segments can be replaced separately without complete disassembly, greatly lowering maintenance costs.

        For rotary‑brush belt cleaners, the core component is a nylon brush roller densely arranged with high‑strength wear‑resistant nylon filaments. Filament diameter ranges from 1‑7 mm and brush height is 50‑100 mm to adapt to different belt widths and working conditions. Adopting a large‑diameter drum structure, the brush roller generates dynamic frictional cleaning force through high‑speed reverse rotation. It can deeply remove fine dust and residual particles trapped in belt gaps and surface micropores, compensating for cleaning blind spots of blade‑type cleaners.

    (2). Tension‑Adjustment Assembly: Core for Precision Assurance

        The tension‑adjustment mechanism is critical for sustained and efficient cleaner operation, solving industry pain points of decreased fitting performance and cleaning failure after blades or brushes get worn. Its mainstream structure includes three components: spring tensioner, elastic buffer seat and pressure‑adjusting bolts. It enables precise control of contact pressure between cleaning components and the conveyor belt; pressure remains stable at 100‑150 N under normal working conditions.

        During equipment operation, with natural wear of blades and bristles, the tension mechanism automatically compensates wear‑caused gaps, keeping cleaning components tightly attached to the belt surface and avoiding cleaning blind spots and missed areas. Meanwhile, the elastic‑buffer structure effectively absorbs vibration and misalignment impact during belt operation. It prevents belt scratches and component fractures induced by rigid contact, balancing cleaning accuracy and equipment protection.

    (3). Fixed‑Support Assembly: Core for Stable Load‑Bearing

        The fixed‑support assembly consists of steel main cross‑beam, mounting brackets and fastening bolts, serving as the load‑bearing foundation for the whole cleaner unit. The main cross‑beam is manufactured from thickened seamless steel pipe or high‑strength alloy plate. It features high rigidity and deformation resistance to withstand vibration loads under various working conditions. Custom‑made mounting brackets can directly fit belt‑conveyor frames, providing accurate installation position and firm fixation. They effectively resist material impact and operational vibration to prevent cleaner offset and shaking. Designed with standardized interfaces, this assembly fits full‑series belt widths from 500‑2000 mm with outstanding universality.

    (4). Drive‑Transmission Assembly: Power Source for Dynamic Cleaning

        This assembly is only equipped on rotary‑brush belt cleaners. Static blade‑type cleaners require no power drive and operate purely relying on friction from the running belt. The drive‑transmission assembly is composed of drive motor, worm‑gear reducer and transmission shaft, available in two modes: electric drive and self‑powered drive.

        Electric drive applies to heavy‑duty industrial conditions. The motor reduces speed and boosts torque via the worm‑gear reducer to drive high‑speed rotation of the brush roller. The tangential speed of brush roller exceeds belt running speed, generating reverse cleaning airflow and friction force to thoroughly strip fine adhered materials. Self‑powered drive rotates the brush roller by belt friction without external power supply. It is energy‑saving and efficient for light‑duty and simple conveying scenarios. Industry‑standard brush‑roller rotating speed is 200‑700 r/min to satisfy cleaning requirements for diverse materials.

3.Mainstream Belt Cleaner Types and Applicable Working Conditions

        Based on structural form, installation position and cleaning hierarchy, the industry applies a two‑stage cleaning system, forming the standardized “rough cleaning + fine cleaning” solution adapted for different material properties and production conditions.

    (1). Primary Head Cleaner (Rough Cleaning)

        Most primary head cleaners adopt alloy or heavy‑duty polyurethane blade structures, installed at the head drive pulley of belt conveyors as the first line of cleaning defense. They are mainly used to remove bulk, thick and caked materials adhered to the belt carrying surface, stripping 60 %‑80 % of residual materials in one pass and significantly reducing subsequent cleaning load. Featuring high rigidity and strong cleaning force, this type suits heavy‑load, high‑abrasion material‑transport scenarios such as coal, ore and sand.

    (2). Secondary Return‑Belt Cleaner (Fine Cleaning)

        Secondary return‑belt cleaners have two structural forms: light‑duty polyurethane blade and rotary‑brush type. They are mounted on the return belt section as an in‑depth cleaning barrier. They thoroughly remove fine dust, sticky coal slime and light powder residues left after primary cleaning and eliminate cleaning blind spots. Rotary‑brush cleaners show particularly prominent advantages. High‑speed rotation clears residual particles inside belt gaps and surface textures with higher cleaning accuracy, fitting high‑precision cleaning scenarios for cement, chemical powder and humid sticky materials.

4. Technical Iteration and Intelligent Upgrade Trends

        Traditional belt cleaners suffer from drawbacks including uneven pressure adjustment, unmonitored component wear and high periodic maintenance costs. Along with industrial intelligent upgrading, belt cleaners are evolving towards modularization, intelligence, maintenance‑free performance and low wear‑and‑tear.

        In structural technology, innovative differential rotary cleaning devices realize dual‑sided synchronous cleaning. The differential‑structure optimizes belt fitting performance and solves problems of uneven stress and incomplete cleaning in single‑side cleaning. Segmented elastic blades replace conventional integral blades, cutting costs for worn‑part replacement by more than 60 %.

        For intelligent monitoring, new‑generation intelligent belt cleaners are fitted with pressure sensors and wear sensors. They monitor real‑time cleaning pressure and component wear degree, upload data to the maintenance system, realize over‑limit early warning and fault alerts, and replace traditional manual inspection rounds.

        In energy‑saving & noise‑reduction aspects, optimized reducer transmission structure and brush‑roller speed‑matching algorithm lower operating noise and energy consumption, complying with green industrial production standards.

5. Conclusion

        Seemingly simple in structure, belt cleaners act as the “cleaning guardian” for belt‑conveyor systems and undertake core missions for stable equipment operation, cost‑efficiency improvement and green production. Their modular structural design, hierarchical‑cleaning technical logic and continuously‑iterated intelligent technologies fully reflect the refinement and specialization trend of industrial auxiliary equipment.

        In modern bulk‑material transportation scenarios, properly‑matched belt cleaners can not only greatly reduce conveyor failure rate and maintenance cost, but also guarantee long‑term stable operation of conveying systems. They are key auxiliary equipment for improving automation and cleanness levels of industrial transportation.

        In the future, with deep integration of new materials and intelligent‑sensor technologies, belt cleaners will keep upgrading toward fully‑intelligent adaptive cleaning and long‑term operation with minimal wear‑and‑tear.