Что такое ленточный конвейер?
A ленточный конвейер is a continuous material handling machine. It uses a circulating conveyor belt to carry and pull materials, and drives material movement through friction. It supports horizontal, inclined and curved material transportation in industrial sites.
What are Belt Conveyors Used For?
Belt conveyors handle granular, powdery and packaged solid materials widely. Common application scenarios include mine raw material transfer, port cargo handling, chemical material delivery, food assembly lines, construction waste sorting and coal transportation in thermal power plants. Compared with other conveying machines, belt conveyors run quietly, carry large material volumes and support long-hour continuous operation.
A conveyor belt acts as the core wearable part of a complete belt conveyor system. Industrial statistics show that conveyor belt procurement, repair and replacement costs account for 40% to 50% of the total life-cycle operation and maintenance cost of belt conveyors. The proportion rises higher for long-distance and high-drop conveying lines.
More than 70% of unplanned shutdowns of belt conveyors stem from abnormal conveyor belt wear, tearing and premature aging. Standard EP polyester conveyor belts serve 2 to 3 years under ideal working conditions. However, improper on-site maintenance shortens the actual service life to only 8 to 14 months. Premature conveyor belt failure brings three direct losses: repeated belt purchasing fees, production downtime losses and manual replacement and repair costs.
Enterprises do not need to purchase high-end wear-resistant conveyor belts blindly to cut operation costs. Standard daily maintenance avoids over 80% of abnormal belt damage and extends conveyor belt service life by nearly 30%. This article summarizes all common damage causes and targeted maintenance solutions based on frontline operation experience.
Improper Conveyor Belt Selection
Damage Cause: Most operators only compare belt prices during procurement. They ignore material temperature, pH value, water content and particle hardness. Mismatched belts suffer early cover rubber aging, core delamination and corrosive fracture. Nearly 90% of premature belt scrapping results from wrong selection rather than quality defects.
Maintenance Solutions: Match conveyor belts with actual working conditions strictly:
- High-temperature materials (sinter, hot coke, cement clinker): Select EP high-temperature resistant conveyor belts for materials over 80℃. Ordinary rubber belts only withstand 60℃ and develop rubber bubbling and core delamination rapidly.
- High-moisture materials (tailings, river sand): Use moisture-proof stretch-resistant belts. Ordinary polyester cores absorb water and deform, which triggers continuous belt deviation and tension loss.
- Corrosive materials (desulfurized gypsum, acidic slag): Adopt neoprene acid and alkali resistant belts. Natural rubber cannot resist chemical corrosion and wears layer by layer quickly.
- Food materials (grain, processed ingredients): Choose food-grade non-toxic conveyor belts. These belts release no harmful substances and resist grease adhesion for easy cleaning.
- Sharp hard materials (basalt, steel slag): Pick anti-tear belts with cover rubber thicker than 6mm to improve puncture resistance.
Belt Conveyor Deviation
Damage Cause: Skewed idlers, uneven material feeding and deformed racks cause conveyor belt deviation. Minor deviation makes belt edges rub against racks and idler brackets continuously, which causes edge layering. Severe deviation clamps belts into rack gaps and leads to transverse tearing. On-site repair takes 4 to 8 hours in most cases.
Maintenance Solutions: Install corrective accessories according to conveyor length. Operators add inclined idlers every 15 meters for belt conveyors shorter than 50 meters. For long-distance and steep-angle belt conveyors, install self-aligning and tapered idlers for automatic correction.
Conveyor Belt Slippage
Damage Cause: Water, dust and frost on drive rollers reduce surface friction. Besides, conveyor belts stretch naturally after long-term operation and lose tension. Both conditions cause belt slippage. Relative friction generates surface temperature over 110℃, which melts internal fiber cores and causes belt delamination or fracture.
Maintenance Solutions: Maintain roller scrapers regularly for humid and dusty sites, and wrap rollers with anti-slip rubber. Check tension devices every quarter and adjust belt tension timely.
Overload and Irregular Start-Stop
Damage Cause: Overloaded feeding and fluctuating material flow cause uneven belt stress. Starting or stopping belt conveyors with loaded materials produces instantaneous tension 2.6 to 2.8 times higher than normal operating tension. Repeated impact loosens internal fiber cores and causes permanent belt elongation.
Maintenance Solutions: Follow rated conveying capacity marked on equipment nameplates. Clear all materials on conveyor belts before shutdown and avoid loaded start-stop. Install soft starters for aging belt conveyors to buffer startup impact.
Material Winding on Rollers
Damage Cause: Fine wet powder penetrates gaps of return conveyor belts and sticks to drive and bend rollers. Adhesive residues change roller roundness and trigger continuous deviation. Hard residues also abrade inner belt rubber and cause core delamination after water infiltration.
Maintenance Solutions: Inspect roller scrapers before daily startup. Ensure polyurethane scrapers fit roller surfaces tightly to clear residual materials completely.
Sharp Foreign Object Intrusion
Damage Cause: Steel bars, anchor rods and broken liner fragments mix into conveyed materials in mine and construction waste sites. These sharp objects cut or pierce conveyor belts irreversibly, and become the top cause of sudden belt scrapping. Manual inspection cannot cover all blind spots.
Maintenance Solutions: Install grating and permanent magnetic iron separators at silo outlets. Match simple metal detectors to intercept sharp foreign objects in advance.
Silo Blockage
Damage Cause: Damp material caking and silo wall adhesion block blanking channels. Stacked materials concentrate local pressure on conveyor belts, which leads to permanent core deformation and belt wrinkling. Severe blockage even stalls the whole belt conveyor.
Maintenance Solutions: Set silo outlet width no less than two-thirds of belt width. Paste wear-resistant liners on chute walls to reduce material adhesion. Check blanking fluency twice per shift to handle blockages timely.
Excessive Material Drop Height
Damage Cause: Materials falling from heights over 1.2 meters generate strong impact force. The force punches belt cover rubber and forms surface pits. Pits accumulate fine dust and expand cracks under long-term stress.
Maintenance Solutions: Install buffer chutes for drop heights between 1.2 and 3 meters. Build independent buffer silos for drop heights over 3 meters. The structures change vertical falling into sliding feeding and cut impact force by over 70%.
Improper Belt Tension
Damage Cause: Insufficient tension leads to belt slippage and deviation. Excessive tension keeps fiber cores under long-term overload tension and accelerates fatigue aging. Both tension errors shorten conveyor belt service life obviously.
Maintenance Solutions: Control idle belt deflection between 10mm and 15mm under normal dry conditions. Fine-tune tension regularly according to natural belt stretching.
Faulty Rotating Idlers
Damage Cause: Water ingress and poor lubrication lock idler bearings. Locked idlers shift rolling friction into sliding friction and speed up local belt wear by 8 times. Rusty broken idlers with sharp edges directly slit conveyor belts.
Maintenance Solutions: Lubricate idler bearings every month. Replace stuck, noisy and damaged idlers during quarterly routine inspections.
Unreasonable Gap Between Skirt Rubber and Belt
Damage Cause: Gaps wider than 3mm cause material leakage and secondary abrasion from residual powder on return belts. Gaps narrower than 1mm squeeze belt surfaces, increase operating resistance and trigger unilateral belt deviation.
Maintenance Solutions: Keep the gap between skirt rubber and conveyor belt strictly at 1mm to 3mm following industrial installation standards.
Insufficient Buffering at Material Loading Points
Damage Cause: Over 60% of conveyor belt wear occurs at loading points. Standard steel idlers cannot absorb material impact, so all impact force directly damages belt rubber and internal cores.
Maintenance Solutions: Replace steel idlers with rubber buffer idlers at loading points. Match buffer beds for heavy high-volume materials to disperse impact force and double local belt service life.
ЧАСТО ЗАДАВАЕМЫЕ ВОПРОСЫ
Q1: What is the standard service life of a conveyor belt?
A1: EP polyester conveyor belts last 2-3 years in dry dust-free indoor sites, and 1.5-2 years in humid outdoor sites. Over 70% of premature failures come from poor daily maintenance instead of product quality flaws.
Q2: How long can a slightly cracked conveyor belt work after repair?
A2: Cold or hot repair works for 6-12 months if only surface rubber cracks without core damage. Repaired belts with core delamination only last 2-4 months, so partial belt replacement is more reliable.
Q3: How to reduce annual conveyor belt replacement costs?
A3: Complete three low-cost upgrades: belt deviation correction, loading point buffering and roller cleaning. The upgrade cost is far lower than belt replacement cost and cuts annual replacement frequency by nearly 40%.
Заключение
Maintenance quality determines 65% of conveyor belt service life, while belt material only accounts for 35%. Many enterprises overinvest in high-grade conveyor belts but ignore routine inspections and parameter adjustment. Standard maintenance workflows including daily cleaning, monthly component inspection and quarterly tension calibration effectively extend belt service life and lower overall operation costs for belt conveyor systems.
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