In highway municipal engineering, highway reconstruction, rural road and emergency repair engineering, the production quality of hot asphalt mixture (HMA) and the comprehensive cost of the project are alwaysthe mixing ratio accuracy andthe equipment transfer mobility. Whether it is a stationary batch mixing plant, a continuous drum mixing plant, or the current mainstream mobile asphalt mixing equipment, the upper performance limit of the whole machine is completely determined by various core components. Many construction units only pay attention to the production capacity and quotation of the whole machine when purchasing equipment, ignoring the material, modular structure and measurement wear resistance of accessories. Finally, there are problems such as large mixture ratio deviation, early damage of pavement, equipment transfer cycle of more than ten days, frequent shutdown and maintenance, etc., which greatly increases the project construction period and operation and maintenance cost.
The core goal of asphalt mixing station is to complete the drying and heating of aggregates according to laboratory mix ratio (JMF), accurate metering of asphalt, mineral powder and recycled old material (RAP), and produce uniform and segregation-free hot mix asphalt mixture. Industry equipment is divided into intermittent (batch type) and continuous drum type two types, the core components of the two frames are consistent, only hot aggregate screening, storage, mixing structure differences. The entire system is interconnected, and any component performance degradation will be transmitted to the finished product quality and equipment mobility.
The cold bin is generally equipped with 3-6 independent bins, which respectively store aggregates of different specifications such as crushed stone, gravel and machine sand. The complete feeding unit is composed of frequency conversion feeder, gate, belt conveyor and belt scale. The basic function of the whole system is to complete the primary grading of aggregate, which is the only grading control node of continuous mixing station; although the batch mixing station is added with secondary correction of hot screen, the stability of cold material supply will still greatly reduce the screening load at the rear end. The mobile mixing station integrates the complete cold bin and conveyor frame into a single trailer chassis. The folding bin baffle and retractable belt structure are the key designs to improve the transfer efficiency.
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The drying drum is an inclined rotating steel cylinder, and lifting blades are arranged in the cylinder to complete the dehydration and temperature rise of aggregates by countercurrent heat exchange, and the aggregates are stably heated to 140-180℃ to ensure full coating of asphalt. The supporting oil/gas dual fuel burner provides stable heat source and is also the unit with the highest energy consumption in the whole station. Roller lifting blade, cylinder wall thickness, burner nozzle, temperature control sensor, directly determine the heating uniformity and machine weight, lightweight wear-resistant blade is the standard optimization item of mobile equipment. Drum mixing station directly in the latter half of the barrel to complete mixing, lifting accessories structure at the same time give consideration to drying and mixing dual role.
It is composed of cyclone primary dust collector + bag filter, which captures ultrafine dust in drying exhaust gas and recovers dust as mineral powder for reuse, which not only meets the environmental protection standard of dust emission lower than 20mg/Nm³, but also saves mineral powder raw materials. Filter bag, pulse ash valve, sealing flange, screw powder feeder are core accessories, mobile equipment adopts split modular bag warehouse, easy to disassemble and transport, poor filter bag is easy to appear dust exceeding standard, powder supply fluctuation, resulting in mixture void rate out of control.
It contains hot material elevator, multi-layer vibrating screen and hot aggregate storage bin, which is the core source of high precision advantage of batch mixing station. The dried hot aggregate is sent to the screening system through the bucket elevator, stored in different hot bins, and then accurately weighed as required to offset the gradation fluctuation caused by cold material feeding and raw material stacking. However, the whole set of screening tower is large in volume and high in weight, so there is no need to consider the transfer of fixed equipment, while the mobile intermittent station must adopt hydraulic self-lifting screening tower and split elevator accessories to reduce the transportation size and lifting difficulty.
Double-layer thermal insulation asphalt storage tank is equipped with heating coil, asphalt conveying pump, thermal insulation pipeline and metering flowmeter to continuously maintain the liquid temperature of asphalt at 150-170℃ to ensure fluidity and metering accuracy. Mobile equipment mostly adopts independent trailer asphalt tank, quick joint pipeline replaces traditional welded pipeline, rapid disassembly during transition, poor insulation layer, flowmeter will have unstable asphalt temperature, measurement drift, resulting in imbalance of asphalt aggregate ratio.
Mineral powder bin, screw conveyor, RAP recycled material supply unit, responsible for adding limestone mineral powder, fiber, polymer modifier, milling old asphalt. Weighing screw, wear-resistant bushing and anti-blocking gate are key accessories. With the popularization of road regeneration projects, RAP supporting modules of mobile equipment must be lightweight and integrated to avoid additional increase in the number of transfer trailers.
The intermittent station is equipped with aggregate weighing hopper, asphalt weighing bucket and mineral powder scale, and the materials enter the double-horizontal shaft forced mixing tank to complete the dry mixing + wet mixing cycle, with a single mixing time of 45-60 seconds; the continuous drum station relies on belt scale and asphalt flowmeter to dynamically and continuously mix, and the mixing is completed in the drum. Mixing cylinder blades, mixing arms, wear-resistant lining plates, weighing sensors are the core wearing parts that determine the uniformity of mixing, the wear resistance of accessories directly affects the coating effect of the mixture, and lightweight high-strength alloy accessories take into account the needs of mobile transportation.
Insulation finished product bin, anti-segregation discharge gate, transfer belt, buffer finished hot mix, match paver feeding rhythm. Mobile equipment adopts small self-lifting finished product bin, foldable discharge chute, reduce the overall transportation width.
The whole machine control center integrates temperature, flow, weighing and dust multi-dimensional sensors, automatically stores multiple sets of production formulas, corrects measurement deviation in real time and records production data. It is the core of coordinating the coordinated operation of all accessories. The mobile equipment is equipped with an integrated vehicle-mounted control room. There is no need to re-wire and debug the transition.
The entire production process forms a closed loop: cold aggregate proportioning and transportation → drum drying and heating → dust recovery and treatment → (intermittent station screening and storage of materials) accurate metering → forced mixing → finished material storage and loading; drum-type equipment simplifies the screening process, drying and mixing The integration is also the underlying structural reason for its greater mobility.
The core evaluation standard of mixing accuracy is that the four indexes of mixture gradation, oil-stone ratio, mineral powder content and temperature fit the laboratory design mixture ratio (JMF), while all precision control nodes are realized by corresponding accessories. The high-quality accessories reduce the proportion error, ensure the uniformity of mixture, and improve the rutting resistance, cracking resistance and water damage resistance of pavement from the source.
The metering system is the first line of defense for accuracy. The standard accuracy of static weighing sensor in intermittent station can reach ±0.1% asphalt metering error and ±0.25% aggregate metering error. Belt scale and asphalt flowmeter in continuous station need to compensate aggregate feeding fluctuation in real time. High-quality weighing accessories built-in temperature, vibration compensation module, mobile equipment can still maintain calibration accuracy after long-distance transportation bumps; low-cost ordinary sensors are prone to zero drift, the oil stone ratio deviation exceeds ±0.5%, less asphalt will cause excessive mixture porosity, loose road permeability, excessive asphalt will appear road flooding, high temperature rutting.
At the same time, the quality of cold bin frequency conversion feeder and belt scale accessories determines the stability of continuous station foundation gradation. If the feeder belt is stretched and the idler is worn, the proportion of various aggregates continues to fluctuate, and the finished material gradation of drum station without rear hot screen correction will continue to deviate from the design value.
The blades, stirring arms and inner lining plates of the double-horizontal shaft stirring cylinder are made of high chromium cast iron, high manganese steel and ceramic composite wear-resistant materials, three-dimensional forced stirring, mixing aggregate and mineral powder in dry mixing stage, spraying asphalt and fully wet mixing to ensure that the surface of each aggregate is evenly coated with asphalt film. If ordinary carbon steel inferior mixing accessories are used, the mixing dead angle increases after short-term wear, and "white material" appears, some aggregates are not coated with asphalt, and the road surface is quickly stripped and damaged when exposed to water; wear accessories will also prolong the mixing time, increase fuel and electricity consumption, and reduce equipment production capacity.
The roller mixing station relies on the material curtain formed by the lifting blades in the drum to complete the mixing. The deformation and wear of the blades will lead to insufficient residence time of the materials, insufficient fusion of the new and old asphalt of the recycled RAP, and the fatigue performance of the recycled mixture will be greatly reduced.
Intermittent equipment Multi-layer vibrating screen, hot bin partition plate is the second guarantee of precision, high-quality screen is not easy to block, tear, accurate classification of coarse aggregate, offset the fluctuation of incoming particle size of sand and gravel yard; hot bin anti-segregation lining design, avoid concentrated accumulation of large particle size aggregate Material leakage and mixing frequently occur on inferior screens, fine materials flow into the coarse silo, the specific surface area of the mixture changes, and the asphalt film thickness is insufficient under the same asphalt dosage, which directly destroys the long-term durability of the pavement. Continuous equipment has no screening link, and can only rely on the accuracy of cold material accessories to control grading. Therefore, intermittent equipment is often selected for high-grade highway projects.
Drying drum lifting blade arrangement, burner temperature control sensor determines the uniformity of aggregate heating, unreasonable blade design will occur local aggregate overheating aging, local residual moisture, residual moisture will destroy the adhesion of asphalt and aggregate; bag dust filter bag, powder feeding screw accessories stable recovery of dust as mineral powder, filter bag damage will cause ultra-fine powder loss, mixture mineral powder content is insufficient, void ratio exceeds the standard, rainwater infiltration into the pavement base causes disease.
The temperature, humidity and flow sensors of the whole machine cooperate with PLC system to compensate the moisture content and temperature change of aggregate in real time, automatically correct the dosage of asphalt and mineral powder, and completely record the production data of each batch to meet the traceability requirements of engineering quality. Low-end uncompensated sensor accessories can only be produced with fixed parameters. After the moisture content of aggregates rises in rainy weather, the mixture ratio continues to be out of control, resulting in a large amount of waste.
On the whole, the uniformity difference of mixture caused by the accuracy of accessories will be directly transmitted to the road service cycle: the hot mixture with stable proportion and uniform coating can greatly reduce the early disease of pavement and reduce the investment in later maintenance; the small proportion deviation caused by insufficient accuracy of accessories will multiply the pavement loss after long-term use.
Mobile mixing station is mostly used for rural roads, scattered projects in mountainous areas, emergency repair and segmented reconstruction projects, which require frequent replacement of construction points. Transfer cycle, site foundation requirements and hoisting labor cost are the core assessment indicators, while the mobility of the whole machine is completely determined by chassis, modularization and lightweight supporting accessories.
The complete set of cold material, roller, dust removal, control room and asphalt tank modules are all equipped with multi-axle semitrailer chassis, equipped with air brake, hydraulic support leg, traction kingpin and other standard walking accessories, which can be transported on the road without dismantling large structures. Fixed equipment without trailer chassis, all components rely on concrete foundation fixed, relocation needs cutting, disassembly, large cranes, construction period as long as several weeks. Mobile equipment hydraulic leveling leg accessories complete equipment leveling on a simple gravel bed, eliminating the need to pour heavy concrete foundations and greatly reducing site preparation time.
The lightweight single-trailer integrated mixing station on the market integrates drying, stirring, dust removal and control into a single chassis, which can be transferred only by one tractor. The overall outline size is reduced by integrated pipelines and folding conveying accessories, so as to avoid the approval cost of large-scale transportation.
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All pipelines, air ducts and material channels of mobile equipment adopt standardized quick joints and plug-in electrical interfaces, which replace traditional welding and flange bolt fixing structures. Pre-wiring and pre-pipe layout are completed when leaving the factory, and it only takes 1-3 days for field docking to be put into production; fixed equipment pipelines are all welded on site, and disassembly and wiring take several weeks. The screening tower and elevator are equipped with hydraulic turnover and self-lifting accessories, which can complete the folding of the tower body without the auxiliary disassembly of large cranes and reduce the rental cost of hoisting machinery.
The drum mixing station naturally has the advantages of mobility, no towering heavy screening tower, multi-layer hot bin module, and fewer overall components; the mobile intermittent station balances accuracy and mobility, adopts split screening tower and detachable hot bin accessories, and is divided into trailers for transportation after disassembly, giving consideration to high accuracy and transfer efficiency.
In order to adapt to the road transportation weight limit, width limit standards, mobile equipment core accessories all do lightweight upgrade: high-strength wear-resistant alloy instead of heavy ordinary steel plate lifting blades, mixing liner; small compact bag bin instead of large fixed dust removal box; folding telescopic belt, detachable bin baffle, split asphalt tank and other accessories, when transporting, gather and disassemble, reduce single trailer load.
If fixed heavy accessories are selected to modify mobile equipment, single module overweight and over-width will occur, multiple over-limit transportation licenses will be required, the transfer cost will increase by 30%-50%, and the risk of long-distance transfer will increase greatly.
Self-lifting finished product bin, foldable discharge chute, independent trailer type mineral powder bin, RAP recycled material simple mobile support, a full set of auxiliary accessories do not need permanent concrete base, after the completion of the project can be synchronously towed away; fixed finished product bin, mineral powder bin for the floor fixed structure, relocation must be dismantled and cut as a whole, can not be transported synchronously with the equipment.
According to the comprehensive engineering data, a complete set of modular accessories suitable for mobile scenarios can reduce the total time for equipment transfer from 2-3 weeks to 1-3 days, reduce the civil construction investment of the site by more than 70%, and more than double the equipment utilization rate for projects with scattered construction period and multi-point synchronous construction.
The material, structure and size design of asphalt mixing plant accessories determine the upper limit of asphalt mixture quality from the root. Even if the production operation completely follows the specifications, the design defects of the parts themselves or the aging wear after long-term use will cause irreversible mixture performance problems, and the influence of each part on the quality of the finished product is closely linked and highly correlated. Among them, the cold bin feeder and distribution baffle are not reasonably designed, which is easy to cause aggregate segregation and uneven batching; the continuous mixing station will directly have the problem of mixture gradation deviation due to no secondary screening process; the design defects of drying roller lifting blade and cylinder structure will lead to incomplete drying of aggregate and uneven heating, residual moisture will destroy asphalt bonding performance, and local high temperature will accelerate asphalt aging and bury hidden danger of pavement cracking. The structural design of the vibrating screen and mixing cylinder of the intermittent station directly determines the quality of screening and mixing. Defects in the screen will disrupt the gap ratio of the mixture mineral aggregate, and dead corners in the mixing structure will cause uneven mixing of mineral powder and recycled materials, resulting in uneven mixing of the road surface. The strength after compaction is uneven.
In addition, the design shortcomings of dust filter bags, pulse valves, asphalt pipelines, metering flowmeters, finished product silos and PLC control systems will also seriously affect the stability of finished materials. The design defect of dust removal system will cause fluctuation of mineral powder recovery amount, resulting in out of control of mixture void ratio and compaction degree; insufficient precision of asphalt insulation and metering accessories will cause imbalance of asphalt aggregate ratio and induce road flooding and loose diseases; lack of anti-segregation and insulation design of finished product silo will cause mixture stratification and uneven temperature, reducing paving flatness and compaction quality; simple intelligent control system can not correct production parameter deviation in real time, and manual parameter adjustment is easy to produce artificial quality error. More importantly, the long-term wear of accessories will continue to enlarge the original design defects. After the aging failure of core wearing parts such as lifting blades, mixing blades, screens and weighing sensors, the quality deviation of mixture will continue to intensify, which will eventually lead to the scrapping of finished materials. This also highlights that the optimization of accessory materials and regular replacement of wear-resistant accessories are the core keys to stabilizing the production quality of asphalt mixture.
The comprehensive efficiency of municipal and highway projects includes four dimensions: equipment transfer efficiency, on-site production efficiency, material transportation efficiency and operation and maintenance shutdown efficiency. Professional accessories suitable for mobile scenarios can compress the construction period from multiple dimensions and reduce the comprehensive construction cost.
First, modular trailer chassis, quick disassembly accessories to reduce transit downtime. The relocation of traditional fixed equipment requires disassembly, crane and civil engineering restoration, and the shutdown period is as long as ten days; the complete disassembly and assembly of integrated mobile accessories only takes 2-3 days, and the project can be quickly transferred to the next road section during sectional construction. The equipment has no idle gap, and the utilization rate of mechanical shift is greatly improved. There is no need to build a supporting fixed mixing station at remote construction sites in mountainous areas and rural areas. The equipment can be directly connected to the construction site, saving long-distance hot-mix transportation vehicles, fuel, and labor costs. After the mixture transportation distance is shortened, the discharge temperature loss is greatly reduced, and low-temperature mixing is avoided. If the material cannot be compacted to cause waste, the comprehensive transportation cost can be reduced by 20%-40%.
Second, integrated intelligent control accessories reduce on-site debugging manpower. Mobile equipment factory complete sensor, metering system pre-calibration, supporting one-button switching formula function, transfer after completion of splicing without re-calibration of a full set of weighing, flow equipment, novice operators can be put into production with simple training; remote monitoring, fault warning sensor accessories, real-time push blade, filter bag, bearing wear data, change passive shutdown maintenance to planned maintenance, greatly reduce no-warning fault shutdown.
Third, integrated RAP recycling accessories reduce raw material costs. Mobile recycled material supply module is lightweight and integrated. Old pavement milled on construction site can be directly recycled on site without transferring waste asphalt and purchasing a large amount of new aggregate. Raw material procurement and waste disposal costs are reduced simultaneously. Abrasion-resistant mixing and drying accessories are suitable for high-content recycled material production. Old and new asphalt are fully integrated. The performance of recycled mixture meets the requirements of green construction policy.
Fourth, lightweight environmental protection dust removal accessories simplify environmental impact assessment and site management. Mobile bag dust removal module with complete sealing structure, quick assembly after transfer, stable dust emission standards, no need to build a separate fixed dust removal room; dust recovery screw powder accessories stable reuse of ore powder, reduce the purchase of purchased ore powder, realize waste recycling
A large number of engineering practices have proved that a full set of high-quality accessories suitable for mobile working conditions can shorten the overall project period by more than 15%, and the comprehensive cost of equipment operation and maintenance, material transportation and civil construction infrastructure can be significantly reduced, especially suitable for short-term small-scale projects and multi-point scattered repair projects.
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A large number of construction units select low-priced non-standard accessories in order to reduce the purchase cost in the early stage, which seems to save investment in the short term, but causes chain losses such as shutdown, mixture scrapping, pavement diseases, environmental protection fines, etc. for a long time. The comprehensive operation and maintenance cost rises exponentially instead, and the problems corresponding to various accessories failures can be traced clearly.
The service life of ordinary carbon steel stirring blades and lining plates is only 6-18 months. After operation, they are rapidly worn, deformed and broken, and the mixing is not sufficient, resulting in a large number of white materials with incomplete coating. After the gap of the stirring cylinder becomes larger, material accumulation occurs, and the time spent for each cleaning increases, and the equipment capacity decreases. After the wear intensifies, the load rises, the reducer and bearing are overloaded and damaged, causing chain mechanical failure. The single shutdown maintenance takes half a day to several days, and the paving process is forced to stop, resulting in high delay claims. The finished mixture uniformity is insufficient, and the road surface quickly appears loose, potholes and water damage after opening to traffic.
The soft steel lifting blade bends and cracks after short-term use, the aggregate cannot form a uniform material curtain, the drying temperature is uneven, part of the aggregate residual moisture, asphalt bonding failure; the accuracy of the burner nozzle and temperature control sensor accessories is insufficient, the flame fluctuates, the mixture temperature fluctuates beyond ±5℃, the asphalt of high temperature material is aged, the low temperature material is difficult to compact, and the fuel consumption increases by more than 30%; The cylinder wall thickness is insufficient, the perforation occurs after high temperature wear, and the exhaust gas leakage causes environmental protection inspection punishment.
Cheap load cells and belt scales without vibration compensation continue to drift due to trailer bumps and equipment vibration, and the oil-stone ratio and aggregate ratio errors exceed the specification limits; the performance of production batches of mixtures is unstable, and some batches are directly rejected by the supervision, resulting in a large amount of waste causing waste of raw materials; frequent calibration of sensors takes up a large amount of production time and continues to affect the paving progress.
Low-cost screen is easy to block, tear, coarse and fine aggregate mixed warehouse, grading continues to exceed the standard; poor temperature resistance of poor dust filter bag, short-term damage after dust exceeds the standard, facing environmental protection shutdown fines; pulse valve sealing failure, incomplete ash cleaning, bag blockage ventilation blocked, drying capacity decreased, mineral powder recovery is unstable, mixture void rate out of control.
Ordinary rubber belt is easy to stretch and tear, poor material of supporting roller and bearing is easy to lock, materials continue to leak, and a large amount of waste materials are accumulated in the stock yard; the hydraulic support legs of the mobile chassis and the seals of the quick joints are inferior, oil leakage occurs after the transition, the support is unstable, and the leveling of the equipment is difficult, further aggravating the weighing measurement deviation.
The overall chain loss is much higher than the price difference of accessories: downtime, waste material loss, road rework, environmental protection fines, secondary equipment overhaul, the comprehensive cost is several times of the purchase price difference of high-quality wear-resistant accessories, and the cost performance is extremely low in long-term engineering operation.
When purchasing and replacing mixing station accessories, it is necessary to meetthe requirements of lightweight modularization of mobile transition andhigh-precision stable production at thesame time. Standardized purchase logic is formed in combination with equipment type (intermittent/drum mobile station), transition frequency and engineering grade, which is divided into five core purchase dimensions.
High-frequency transfer (1-2 times per month) project, all core units cold material, roller, dust removal, control room select integrated single/double trailer integrated accessories, standard hydraulic self-lifting, folding conveyor, quick plug pipeline joint; screening tower, elevator select split hydraulic turnover accessories, avoid the lifting requirements of large cranes. The transportation size and weight strictly match the highway overrun standard, the overall lightweight of accessories, the use of high-strength alloy instead of heavy steel plate; low-frequency transition long-term fixed operation, moderate relaxation of lightweight requirements, priority to large-capacity heavy accessories.
Pit avoidance points: Refuse to modify accessories without standard quick joints and fixed welded pipelines, and the time spent on disassembly and assembly will be greatly increased; avoid excessive weight of heavy tower accessories, and the cost of over-limit transportation approval will be too high.
Weighing sensors, belt scales and asphalt flow meters must be certified products with vibration and temperature automatic compensation, and the asphalt metering accuracy shall be controlled within ±0.3%; mobile equipment shall focus on calibration stability after transportation bumps, support one-key zero-return calibration and data storage traceability; NTEP and other measurement certification brand accessories in the same industry shall be preferred, and cheap sensors without calibration and compensation shall be eliminated.
The mixing blades, liners, and drum lifting blades are made of high-chromium cast iron, high-manganese steel, or ceramic composite materials, with a hardness of HRC55-65, and the service life is increased by 2-3 times; the structural thickness of the accessories is simultaneously optimized to control the weight while ensuring the wear resistance., does not increase the trailer transfer load; the screen is made of wear-resistant and anti-blocking material, and the bag is made of Nomex high temperature resistant filter material, which is suitable for frequent start and stop conditions of mobile equipment.
The mobile intermittent station adopts split multi-layer vibrating screen, and the screen bin can be disassembled for transportation; the bag filter adopts small modular bin, the filter bag can be quickly replaced by one person, and the pulse valve has excellent sealing performance to stably recover mineral powder; it is equipped with small self-lifting finished product bin and folding discharge chute to reduce the number of transfer trailers.
The whole set of control unit is integrated in the trailer control room, pre-storing multiple sets of road mix ratio, no need to reprogram after transition; equipped with multi-dimensional Internet of Things sensors, real-time monitoring of temperature, weighing, vibration and dust, with fault warning and remote monitoring functions; giving priority to original accessories to ensure signal intercommunication of the whole machine, avoiding signal incompatibility and control deviation of third-party accessories.
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With the growth of smart construction site, green recycling construction and high-frequency mobile construction demand, the asphalt mixing station accessories industry iterates in three directions: intelligent digitalization, extreme lightweight modularization and low-carbon sustainability, taking into account the two core requirements of mixing accuracy and transition mobility.
The new generation PLC control system integrates multi-sensor fusion technology to collect aggregate moisture content, recycled asphalt content, cylinder temperature and equipment vibration data in real time online, and automatically corrects aggregate, asphalt and mineral powder dosage dynamically by machine learning algorithm, reducing the fluctuation range of proportion by 70%; it is equipped with digital twin virtual equipment module to remotely simulate production conditions and predict wear failure of accessories, changing from traditional maintenance after failure to predictive maintenance, greatly reducing downtime. Cloud platform remote monitoring, voice intelligent operation and maintenance assistant popularization, management personnel to view production data in different places, switch mix ratio, adapt to multi-point mobile device unified management.
The brand-new generation of accessories adopts standardized container integrated structure, the whole set of mixing units are installed into standard container frame, the lifting and trailer transfer process is standardized, and there is no need to disassemble core components; the full-hydraulic self-lifting screening tower, automatic folding belt and one-button docking pipeline joint are fully popularized, and the transfer installation time of small mobile mixing station is reduced to several hours; Lightweight high-strength composite materials gradually replace traditional steel, the weight of accessories is further reduced, the single-vehicle carrying capacity is improved, and the number of transshipment trailers is reduced. GPS positioning accessories are synchronously equipped to facilitate the overall scheduling of multiple mobile devices.
Multi-fuel compatible burner accessories support natural gas, biodiesel, green hydrogen combustion, greatly reduce drying carbon emissions; efficient waste heat recovery accessories recovery drum exhaust heat preheating aggregate, reduce fuel consumption; special RAP recycled material mixing blades, drying lifting accessories, support more than 50% high proportion of old material recycling, old and new asphalt uniform fusion, recycled mixture performance to new material standards; Photovoltaic auxiliary heating asphalt tank accessories are gradually commercialized to further reduce fossil energy consumption.
New damping weighing sensor, anti-bump metering module, no need to repeat calibration after long-distance transportation; ceramic composite wear-resistant mixing, drying accessories greatly prolong the service life, reduce the replacement frequency of wearing parts; online spectrum detection accessories real-time detection of finished mixture grading, asphalt content, forming production-quality closed-loop control, completely eliminate manual sampling detection lag.
Long-term industry development will form two parallel product lines: fixed intelligent large-scale mixing station accessories mainly focus on ultra-high capacity, full-dimensional digital control; highly modular mobile mixing accessories mainly focus on lightweight, rapid transfer, on-site regeneration production, adapt to domestic infrastructure reconstruction and expansion, rural roads, emergency repair and other diversified engineering needs.
The core accessories of asphalt mixing station directly determine the mixing accuracy and transition mobility of equipment, which complement each other and balance each other. Fixed heavy accessories have excellent mixing accuracy, but the transition cost is high and the cycle is long; lightweight modular mobile accessories are flexible and efficient, and high-precision accessories with high wear resistance and vibration resistance are required to stabilize the production quality of the mixture. Construction procurement shall be combined with project scenario selection. High-speed, airport and other high-grade pavement shall be adapted to intermittent high-precision accessories. Rural short-distance and scattered repair projects are more suitable for roller-type modular mobile accessories. Do not pursue low price or mobility unilaterally.
Inferior accessories are easy to cause problems such as imbalance of ratio, road diseases, equipment shutdown, environmental protection punishment, etc., and the overall operation and maintenance cost far exceeds that of high-quality accessories. With the development of intelligent construction site and green infrastructure, lightweight and intelligent mixing accessories have become the mainstream of the industry, which can effectively shorten the transition period, control the construction cost, stabilize the mixing accuracy, prolong the service life of the road, and give consideration to the project quality and construction efficiency. It is the core preferred direction for the procurement of mixing equipment for highway engineering at this stage.
