Drying drums, vibrating screens, asphalt main mixers and elevators are core equipment of asphalt mixing plants. Support bearings for dryer rollers, excitation positions of vibrating screens and bearing housings of mixer main shafts operate under harsh working conditions: continuous combined alternating impact loads, high-temperature thermal radiation from drying drums, floating hard sand aggregate dust in plant areas, viscous flue gas volatilized by high-temperature asphalt, periodic load fluctuation, alternating hot and cold temperatures in open yards and non-stop asphalt mixture production during construction peak seasons. Road construction schedules are tight, and asphalt mixtures need continuous supply. Once equipment shuts down due to bearing failure, high-temperature aggregates inside drums will cool down and asphalt tends to solidify and agglomerate. Cleaning coke deposits takes a long time, and reheating and commissioning consume massive fuel, directly leading to construction delays and huge raw material waste. Ordinary tapered roller bearings cannot adapt to special harsh environments in mixing plants with high temperature, dense dust and asphalt fume erosion, becoming a common pain point for asphalt machinery manufacturers and mixing station operators. Dryer drums and vibrating screens continuously bear bidirectional alternating loads and axial impact forces, and periodic impact arises from fluctuation of aggregate feeding volume. Ordinary bearings have insufficient fatigue resistance and tend to form raceway indentation and rolling element surface peeling under long-term cyclic loads, triggering excessive equipment vibration and reduced screening efficiency. Drying zones are continuously exposed to high-temperature radiation; conventional grease oxidizes and carbonizes rapidly under heat. Asphalt fumes penetrate bearing gaps and easily solidify, causing internal jamming by coke deposition. Sand aggregate dust features high hardness and sharp edges and floats continuously. Simple seals are easily worn by hard particles. Dust together with asphalt fumes penetrates into bearing housings, mixes with grease and forms abrasive medium that continuously wears raceways and rolling elements. Large temperature difference between day and night in open yards and repeated thermal alternation continuously harden seals and cause elasticity loss. Disassembly of large mixing main equipment involves complicated procedures, and maintenance shutdown during peak construction seasons will directly cut off raw material supply for road projects and continuously increase comprehensive costs including fuel and maintenance of mixing stations.

Focusing on transmission supporting field for asphalt mixing equipment, Japan NMT specially develops high-temperature dust & asphalt fume resistant heavy-duty tapered roller bearings dedicated for drying drums, vibrating screens and main mixers for asphalt mixing plants to solve industry pain points of ordinary mixing plant bearings such as insufficient heat resistance, caking adhesion induced by infiltrated asphalt fumes, abrasive wear caused by aggregate dust ingress, susceptibility to fatigue under alternating hot and cold conditions and limited service life under continuous mixing operation. Taking advantage of bidirectional linear load-bearing structure of tapered rollers, combined with five core upgrades including heat-resistant anti-caking refined bearing alloy steel, multi-layer labyrinth high-temperature dust & asphalt fume barrier composite sealing, deep-hardening super-finishing strengthening technology for raceways, high-temperature anti-caking long-life lubrication and precise clearance matching for alternating loads of mixing plants, it fully adapts to harsh mixing plant conditions with high-temperature radiation, aggregate dust and asphalt fume interference. It fundamentally solves problems including high-temperature coke deposition, asphalt adhesion, abrasive wear by dust and seal hardening failure, stabilizes rotation precision of drying drums, vibrating screens and mixing main shafts and guarantees long-cycle continuous stable supply of asphalt mixtures.

Core Product Advantages

1. Bidirectional ultra-large combined impact load bearing withstands alternating excitation force and dynamic axial thrust: Adopting tapered roller linear contact structure, it bears high-strength radial heavy loads and continuous axial thrust simultaneously with uniform load distribution in contact zones. It effectively buffers alternating impact generated by aggregate feeding fluctuation and continuous excitation of vibrating screens, balances eccentric loads during operation of dryer support rollers and mixing main shafts, restrains local overload wear on unilateral raceways and stably controls axial play of shaft systems to reduce secondary failures such as abnormal equipment vibration and screen damage.

2. Heat-resistant anti-caking bearing steel matrix delivers long-term fatigue and wear resistance under high-temperature fume environment: Selected high-purity heat-resistant bearing alloy steel specially for heavy asphalt mixing equipment undergoes deep quenching & tempering heat treatments to optimize metallographic structure under high-temperature fume conditions, improve resistance to adhesion by asphalt medium while maintaining excellent alternating fatigue resistance. It withstands long-term continuous impact loads, delays raceway fatigue damage and surface peeling of rolling elements, and lowers risks of premature failure induced by dual erosion of high temperature and asphalt fumes.

3. Multi-layer labyrinth high-temperature fume & aggregate dust barrier composite sealing blocks ingress and adhesion of dust and asphalt fumes: Equipped with exclusive high-temperature anti-caking thickened seal lip & multi-labyrinth protective structure for asphalt mixing conditions. It resists hardening failure under high temperature, and the labyrinth structure prevents condensation and adhesion of asphalt fumes. It intercepts sand aggregate dust and high-temperature asphalt volatiles layer by layer, prevents viscous fumes and hard dust from entering housings and contaminating grease, and avoids asphalt caking adhesion and persistent abrasive wear.

4. Deep-hardening super-finishing grinding technology for raceways controls frictional temperature rise and suppresses equipment vibration: Deep hardening treatment plus micron-level super-finishing grinding is applied on contact surfaces of raceways and rollers to optimize contact profile, improve oil film stability under alternating hot and cold conditions, reduce heat accumulation under continuous alternating loads, slow precision attenuation after years of continuous mixing production, lower vibration of vibrating screens and drying drums and guarantee stability of aggregate screening and mixture mixing processes.

5. Customized clearance for alternating loads of mixing plants & high-temperature anti-caking long-life lubrication system: Internal clearance is precisely matched according to different operating temperature and load of dryer support rollers, vibrator shafts of vibrating screens and main shafts of mixing hosts to avoid seizure under low temperature and thermal expansion seizure under sustained high temperature. Matched with special lubrication formula resistant to high temperature, asphalt adhesion and dust contamination, it adapts to changeable hot and cold open-air environments of mixing plants and extends on-site lubrication maintenance intervals.

Application Scenarios

Support roller and thrust roller bearings for drying drums, vibrator bearings for vibrating screens, bearing housing bearings for main shafts of asphalt mixers, transmission bearings for aggregate elevators and conveyor rollers, heavy-duty transmission supporting positions of aggregate drying, screening and mixing sections of all batch-type and continuous asphalt mixing plants.

Precision Quality Assurance

NMT tapered roller bearings for asphalt mixing plant construction machinery are manufactured strictly in accordance with Japanese heavy road construction machinery component manufacturing standards. Selected special bearing steel with heat resistance, asphalt anti-adhesion performance and dust abrasion resistance undergoes continuous high-temperature temperature rise test, asphalt fume aging test, aggregate dust flushing sealing durability test, alternating vibration fatigue test and hot-cold cycle aging test. The products feature powerful bidirectional load capacity, outstanding heat and anti-caking performance and robust reliable dust & fume barrier sealing performance, fully adapting to 24-hour non-stop mixture mixing conditions with high temperature, floating dust and volatile asphalt fumes in asphalt mixing plants.

Product Range

Heavy-duty high-temperature resistant tapered roller bearings for dryer support rollers, long-life anti-vibration bearings for vibrating screens, dust & asphalt fume resistant bearings for mixing main machines, wear-resistant transmission bearings for elevator rollers, customized large-size non-standard tapered roller bearings for complete large asphalt mixing equipment.

Brand Strength

Japan NMT focuses on R&D and manufacturing of bearings for heavy asphalt mixing equipment under working conditions of combined alternating impact loads, high-temperature radiation from drying drums, viscous fumes volatilized by hot asphalt, erosion by hard sand aggregate dust, alternating hot and cold cycles in open yards and continuous mixing during construction peak seasons, specializing in core technologies of bidirectional load balance optimization, high-temperature anti-caking protection, multi-layer fume & dust barrier sealing protection and alternating vibration fatigue wear prevention. With Japanese heat treatment technology for heat-resistant steel, exclusive high-temperature asphalt anti-adhesion sealing technology for asphalt mixing machinery and strict mixing plant simulation durability testing system under high-temperature, dust and fume conditions, it accurately solves industry pain points of mixing plant bearings such as asphalt caking adhesion, abrasive wear failure by dust, carbonization of lubricant under high temperature, raw material waste and construction delay caused by shutdown cleaning, supplying high-load, high-temperature resistant, vibration-proof, dust & fume barrier long-life core transmission bearing components for global asphalt mixing machinery manufacturers.