Intelligent mixing construction method for asphalt mixture

Abstract

The invention particularly relates to an intelligent mixing construction method for an asphalt mixture. The intelligent mixing construction method comprises the following steps: step S1, construction preparation; s2, checking whether the intelligent asphalt mixture mixing equipment meets a starting condition or not; if the starting condition is met, the step S3 is carried out; s3, shoveling and conveying the mineral aggregate; s4, heating, drying and lifting the materials; s5, dust removal; s6, screening, metering and conveying the hot aggregate; step S7, stirring the mixture; step S8, storing the asphalt mixture; and step S9, carrying out truck loading operation on the asphalt mixture. The production efficiency is improved, the material cost is saved, the energy is saved, the environment is protected, and the mixing ratio precision of the asphalt mixture can be obviously improved.

Description

Technical Field

[0001] The present application belongs to the technical field of asphalt mixing, and specifically relates to an intelligent mixing construction method for asphalt mixture. Background Art

[0002] With the continuous development of infrastructure construction, asphalt mixing plants are widely used in high-grade highways, urban roads, airports, docks, parking lots and other projects. It is the first key equipment for asphalt pavement construction, and its performance directly affects the quality of asphalt pavement. Asphalt mixing plants are factory-style complete sets of equipment that mix and stir dried and heated mineral materials of different particle sizes, fillers and asphalt according to the designed mix ratio at a specified temperature into a uniform mixture.

[0003] In the prior art, there is still a problem of insufficient mixing accuracy of asphalt mixture. Summary of the invention

[0004] In order to solve the above-mentioned deficiencies in the prior art, the present invention provides: an asphalt mixture intelligent mixing construction method, the improvement of which is that the method comprises the following steps:

[0005] An asphalt mixture intelligent mixing construction method, the improvement of which is that the method comprises the following steps:

[0006] Step S1: Construction preparation, including,

[0007] Step S1-1, designing a target asphalt mixture ratio, includes:

[0008] Step S1-1-1, determining the composition ratio of each mineral material used to form the target asphalt mixture;

[0009] Step S1-1-2, mixing the target asphalt mixture with a small laboratory mixer to determine the optimal asphalt-to-aggregate ratio OAC of the target asphalt mixture;

[0010] Step S1-1-3, testing the target asphalt mixture performance;

[0011] Step S1-2, mixing the target asphalt mixture with a laboratory mixer, and obtaining the produced asphalt mixture;

[0012] Step S1-3, performing a Marshall test on the produced asphalt mixture to verify the proportion of the produced asphalt mixture, includes:

[0013] Step S1-3-1, sampling from the hot material bin to obtain the material ratio of the production mineral material and mineral powder for producing the asphalt mixture, so that the production asphalt mixture ratio meets the target asphalt mixture ratio;

[0014] Step S1-3-2, determining the optimal oil-stone ratio for producing the asphalt mixture; if the optimal oil-stone ratio for producing the asphalt mixture matches the optimal oil-stone ratio for the target asphalt mixture, proceed to step S1-3-3; if the optimal oil-stone ratio for producing the asphalt mixture does not match the optimal oil-stone ratio for the target asphalt mixture, repeat steps S1-3-1 and S1-3-2;

[0015] Step S1-3-3, inspecting the performance of the produced asphalt mixture; if the performance of the produced asphalt mixture is within the design requirements, proceed to step S2, and perform asphalt mixture mixing construction; if the performance of the produced asphalt mixture is not within the design requirements, repeating steps S1-3-1 to S1-3-3;

[0016] Step S2, checking whether the asphalt mixture intelligent mixing equipment meets the start-up conditions; if the start-up conditions are met, proceeding to step S3;

[0017] Step S3: shoveling and conveying the ore; using a loader to put the ore of different specifications into the corresponding cold material bin, and conveying the ore to the drum for heating through a belt conveyor;

[0018] Step S4: heating, drying and raising the material; adding a drum to dry the ore to form hot aggregate; using a hoist to transport the hot aggregate to a higher place and unloading it into a hot aggregate screening machine;

[0019] Step S5: dust removal; the combustion exhaust gas, water vapor, dust generated in the drum and the dust collected from the vibrating screen in the main building are settled and filtered to discharge gas that meets environmental protection requirements;

[0020] Step S6: screening, metering, and conveying hot aggregate; the control system automatically identifies the hot aggregate model and hot aggregate level, and conveys the hot aggregate to the corresponding silo via a belt;

[0021] Step S7: stirring the mixture to form an asphalt mixture; the mixture includes: hot aggregate, powder, asphalt or modified asphalt;

[0022] Step S7-1, heating asphalt or heating modified asphalt, and keeping the asphalt or modified asphalt warm;

[0023] Step S7-2, metering asphalt or modified asphalt and delivering the asphalt or modified asphalt;

[0024] Step S7-3, measuring the mineral powder and conveying the mineral powder;

[0025] Step S7-4, stirring the mixture;

[0026] Step S8: storing asphalt mixture;

[0027] Step S9: Loading the asphalt mixture onto a truck.

[0028] Preferably, step S1-1-2, mixing the target asphalt mixture with a laboratory small mixer, and determining the optimal asphalt-aggregate ratio OAC of the target asphalt mixture, comprises:

[0029] Step S1-1-2-1, using the mineral materials constituting the target asphalt mixture, within a preset asphalt-rock ratio range, changing at intervals of 0.5%, taking five different asphalt-rock ratios to prepare five groups of Marshall specimens of the target asphalt mixture;

[0030] Step S1-1-2-2, obtaining the density, stability-flow value, void ratio and asphalt saturation of each group of Marshall specimens;

[0031] Step S1-1-2-3, select the oil-stone ratio a1 corresponding to the maximum density; select the oil-stone ratio a2 corresponding to the maximum stability; select the oil-stone ratio a3 corresponding to the target void ratio or the median void ratio; select the oil-stone ratio a4 with the asphalt saturation being the median asphalt saturation, and take the average of the four as the optimal initial value of the oil-stone ratio OAC1 according to the following formula;

[0032] OAC1=(a1+a2+a3+a4) / 4;

[0033] Step S1-1-2-4, obtaining the maximum asphalt-rock ratio OACmax1 and the minimum asphalt-rock ratio OACmin1 that can simultaneously meet the density, stability-flow value, void ratio and asphalt saturation standards of the target asphalt mixture, and taking the median OAC2; OAC2 = (OACmax1 + OACmin1) / 2;

[0034] If OAC1 is outside the range of OACmin1 to OACmax1, repeat steps S1-1-1 to S1-1-2 to adjust the gradation and re-design the mix ratio;

[0035] Step S1-1-2-5, obtaining the optimal asphalt-aggregate ratio of the target asphalt mixture OAC=(OAC1+OAC2) / 2.

[0036] Preferably, if the asphalt saturation range exceeds the corresponding preset oil-to-stone ratio range, the average value of the three oil-to-stone ratios is calculated as the optimal oil-to-stone ratio initial value OAC1 according to the following formula: OAC1 = (a1 + a2 + a3) / 3.

[0037] Preferably, if the peak value of density or stability appears outside the preset asphalt-stone ratio range corresponding thereto, the asphalt-stone ratio a3 corresponding to the target porosity or the median porosity is used as OAC1.

[0038] Preferably, step S1-3-2, determining the optimal asphalt-aggregate ratio OACz for producing asphalt mixture, comprises:

[0039] Step S1-3-2-1, taking the best asphalt-to-stone ratio OAC of the target asphalt mixture, and three asphalt-to-stone ratios of OAC+0.3% and OAC-0.3%,

[0040] Step S1-3-2-2, taking the production asphalt mixture calculated in step S1-3-2-1 and using it to prepare five groups of Marshall specimens of the production asphalt mixture for conducting a Marshall test of the production asphalt mixture;

[0041] Step S1-3-2-3, obtaining the density, stability-flow value, void ratio and asphalt saturation of each group of Marshall specimens for producing asphalt mixture;

[0042] Step S1-3-2-4, select the oil-stone ratio b1 corresponding to the maximum density of the asphalt mixture; select the oil-stone ratio b2 corresponding to the maximum stability of the asphalt mixture; select the oil-stone ratio b3 corresponding to the void ratio of the asphalt mixture being the target void ratio or the median void ratio; select the oil-stone ratio b4 when the asphalt saturation of the asphalt mixture is the median asphalt saturation, and take the average of the four as the optimal initial value OACx of the oil-stone ratio for the asphalt mixture according to the following formula; OACx = (b1 + b2 + b3 + b4) / 4;

[0043] Step S1-3-2-5, obtaining the maximum oil-stone ratio OACmax2 and the minimum oil-stone ratio OACmin2 of the asphalt mixture that can simultaneously meet the standards of density, stability-flow value, void ratio and asphalt saturation of the asphalt mixture, and taking the median value to obtain OACy; OACy = (OACmax2 + OACmin2) / 2;

[0044] Step S1-3-2-6, obtaining the optimal asphalt-aggregate ratio for producing asphalt mixture OACz=(OACx+OACy) / 2;

[0045] Step S1-3-2-7, compare OACz and OAC; if OACz / OAC≤0.2%, proceed to step S2, mix asphalt mixture; if OACz / OAC>0.2%, repeat steps S1-3-1 and S1-3-2.

[0046] Preferably, step S3 also includes: the automatic control system controls the opening of the cold material bin discharge port, the cold material bin is opened, and the mineral material that meets the production grading is poured into the belt conveyor according to a preset mix ratio; the automatic control system controls the belt speed, and the mineral material is transported to the drum for heating through the belt conveyor.

[0047] Preferably, step S4 further comprises: controlling the heating temperature of the drum by an automatic control system, and the heating temperature of the mineral material is 10° C. to 30° C. higher than the heating temperature of the asphalt or modified asphalt.

[0048] Preferably, step S5 further comprises: dust particles with a particle size ≥ 0.075 mm are separated and collected by a gravity dust collector, and dust particles with a particle size < 0.075 mm are filtered and settled by a bag dust collector.

[0049] Preferably, step S6 further includes:

[0050] Step S6-1, screening, screening hot aggregate in a hot aggregate screening machine; screening the hot aggregate into multiple specifications by the screening machine, and each specification of hot aggregate falls into a corresponding hot material storage compartment for storage;

[0051] Step S6-2, metering; according to the set ratio, each specification of hot aggregate is put into the stone metering bin in batches in the order of small first and large later for cumulative metering, and the amount of hot aggregate put into the hot material storage compartment is controlled by the automatic control system, and is put into the respective metering devices for metering according to the set ratio;

[0052] Step S6-3, conveying hot aggregate; after weighing, putting the hot aggregate into the stirring pot for forced stirring according to a preset sequence.

[0053] Preferably, step S7-2 further includes:

[0054] Step S7-2-1, determining the temperature of asphalt or modified asphalt; if the temperature of asphalt or modified asphalt meets the set value, proceed to step S7-2-2; if the temperature of asphalt or modified asphalt does not meet the set value, repeat steps S7-1 to S7-2;

[0055] Step S7-2-2, initial metering of asphalt or modified asphalt; the automatic control system controls the motor speed of the asphalt circulation pump;

[0056] Step S7-2-3, secondary metering of asphalt or modified asphalt; the automatic control system controls the motor speed of the asphalt circulation pump;

[0057] Step S7-2-4, when the weight of the asphalt scale reaches the set upper limit or the asphalt scale liquid level switch is triggered, the automatic control system will alarm and automatically shut down the asphalt circulation pump, prohibiting further measurement.

[0058] Compared with the prior art, the present invention has the following beneficial effects:

[0059] The intelligent mixing construction method for asphalt mixture involved in this application can produce asphalt mixture of more than 420t / h according to actual measurements, which is 10% to 20% higher than the unit production capacity of equipment of the same level, highlighting the feature of high production capacity.

[0060] The intelligent mixing construction method of asphalt mixture involved in this application provides energy-saving and environmentally friendly combustion technology, high-efficiency medium atomization, and gas stratified combustion. The fuel consumption for producing asphalt mixture is 5.5kg / t, which can save 15% of heavy oil, which is lower than the industry average of 6.5kg / t, highlighting the feature of reducing fuel consumption.

[0061] The intelligent asphalt mixture mixing construction method involved in this application realizes more accurate raw material measurement, with the oil-stone ratio deviation ≤0.1%, which is lower than the industry standard of 0.3%. The modified asphalt dosage adopts frequency converter control and secondary metering to achieve a mixture oil-stone ratio deviation of <0.1%; the mineral material dosage is coordinated with the feed port size gate control, pulse jitter and multi-speed regulation to achieve a mineral material measurement deviation of less than 20kg; the powder material dosage is coordinated with the frequency conversion spiral and the feed weighing drop self-adjustment to achieve a powder material measurement deviation of less than 1kg.

[0062] The asphalt mixture intelligent mixing construction method involved in this application adopts a cold material ventilation dust removal system and a condensation recovery and reuse system to effectively control the smoke generated during the production process and meet the dust emission requirement of ≤10mg / m 3 , Asphalt fume emission ≤10mg / m 3 .

[0063] With the high-precision metering and automatic temperature control system, the mixing degree of the mixture in the mixing pot can be visually adjusted. By adopting a new intelligent control system, the four major advantages of digital mixing are realized, which increases the mixing efficiency of the asphalt mixing station by 20%. The entire production process is managed and controlled in a digital and intelligent manner. BRIEF DESCRIPTION OF THE DRAWINGS

[0064] Figure 1 The asphalt mixture intelligent mixing construction steps involved in this application;

[0065] Figure 2 Schematic diagram of each module of the automatic control system involved in this application. DETAILED DESCRIPTION

[0066] The technical solutions in the embodiments of the present invention are described clearly and completely below. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. All other embodiments obtained by ordinary technicians in this field based on the embodiments of the present invention belong to the scope of protection of the present invention.

[0067] In the description of the present invention, the terms "longitudinal", "lateral", "upper", "lower", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom" and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings. They are only for the convenience of describing the present invention and do not require that the present invention must be constructed and operated in a specific orientation. Therefore, they should not be understood as limitations on the present invention. The terms "connected" and "connected" used in the present invention should be understood in a broad sense. For example, they can be fixed connections or detachable connections; they can be directly connected or indirectly connected through intermediate components. For ordinary technicians in this field, the specific meanings of the above terms can be understood according to specific circumstances.

[0068] The present invention will be described in detail below with reference to the accompanying drawings and in combination with embodiments. It should be noted that the embodiments and features in the embodiments of the present invention can be combined with each other without conflict.

[0069] The present application relates to an intelligent asphalt mixture mixing construction method, such as Figure 1 As shown, the following steps are included: Step S1: construction preparation; Step S2, check whether the asphalt mixture intelligent mixing equipment meets the start-up conditions; if the start-up conditions are met, proceed to Step S3; Step S3: shoveling and conveying mineral materials; Step S4: heating, drying and lifting materials; Step S5: dust removal; Step S6: screening, metering and conveying hot aggregates; Step S7: stirring the mixture; Step S8: storing the asphalt mixture; Step S9: loading the asphalt mixture.

[0070] like Figure 2 As shown, the control system used for the asphalt mixture intelligent mixing equipment involved in the present application includes the following modules: a starting module, a fault detection module, a cold material bin discharge port control module, a belt conveyor module, a roller heating module, a hot aggregate identification module, a hot aggregate metering module, a thermal oil heating module, a cylinder drive module, a thermal oil heating module, a cylinder drive module, an asphalt circulation pump drive module, a powder metering module, a stirring module, a storage module and a unloading module.

[0071] The present application relates to an asphalt mixture intelligent mixing construction method implemented in combination with the above modules, including the following specific steps:

[0072] Step S1: Construction preparation, including,

[0073] Step S1-1, designing a target asphalt mixture ratio, includes:

[0074] Step S1-1-1, determine the composition ratio of each mineral material used to form the target asphalt mixture. Specifically, determine the composition ratio of each mineral material. Take each type of mineral material from the construction site for screening, and use a computer or graphic to calculate the amount of each mineral material so that the gradation of the synthesized mixed mineral material meets the range of Table 1. Repeat the calculation so that the mixed mineral material gradation curve should be close to a smooth S curve.

[0075]

[0076]

[0077] Table 1 Gradation range of various asphalt mixtures (%)

[0078] Step S1-1-2, mixing the target asphalt mixture with a small laboratory mixer, and determining the optimal asphalt-to-aggregate ratio OAC of the target asphalt mixture, including:

[0079] Step S1-1-2-1, using the mineral materials constituting the target asphalt mixture, within a preset asphalt-rock ratio range, changing at intervals of 0.5%, taking five different asphalt-rock ratios to prepare five groups of Marshall specimens of the target asphalt mixture;

[0080] Step S1-1-2-2, obtaining the density, stability-flow value, void ratio and asphalt saturation of each group of Marshall specimens;

[0081] Step S1-1-2-3, select the oil-stone ratio a1 corresponding to the maximum density; select the oil-stone ratio a2 corresponding to the maximum stability; select the oil-stone ratio a3 corresponding to the target void ratio or the median void ratio; select the oil-stone ratio a4 with the asphalt saturation being the median asphalt saturation, and take the average of the four as the optimal initial value of the oil-stone ratio OAC1 according to the following formula;

[0082] OAC1=(a1+a2+a3+a4) / 4;

[0083] Step S1-1-2-4, obtaining the maximum asphalt-rock ratio OACmax1 and the minimum asphalt-rock ratio OACmin1 that can simultaneously meet the density, stability-flow value, void ratio and asphalt saturation standards of the target asphalt mixture, and taking the median OAC2; OAC2 = (OACmax1 + OACmin1) / 2;

[0084] If OAC1 is outside the range of OACmin1 to OACmax1, repeat steps S1-1-1 to S1-1-2 to adjust the gradation and re-design the mix ratio;

[0085] Step S1-1-2-5, obtaining the optimal asphalt-aggregate ratio of the target asphalt mixture OAC=(OAC1+OAC2) / 2.

[0086] Preferably, if the asphalt saturation range exceeds the corresponding preset oil-stone ratio range, that is, the preset oil-stone ratio range fails to include the required range of asphalt saturation, the average value of the three is calculated according to the following formula as the optimal oil-stone ratio initial value OAC1; OAC1 = (a1+a2+a3) / 3.

[0087] Preferably, if the peak value of density or stability appears outside the corresponding preset asphalt-stone ratio range, that is, the density or stability does not peak within the preset asphalt-stone ratio range (the maximum value is often at both ends of the S curve), the asphalt-stone ratio a3 corresponding to the target porosity is used as OAC1.

[0088] Specifically, step S1-1-2-1 uses the calculated mineral composition and the empirically adopted asphalt-stone ratio range, changes at intervals of 0.5%, takes five different preset asphalt-stone ratios, namely OAC0-1.0%, OAC0-0.5%, OAC0, OAC0+0.5%, OAC0+1.0%, and uses a laboratory small mixer to mix the target asphalt mixture to prepare five groups of Marshall specimens.

[0089] Step S1-1-2-2, measure the density, porosity, asphalt saturation, stability and flow value of the test piece, and draw curves of each indicator respectively with the above indicators as the vertical coordinates and the above five different asphalt-rock ratios as the horizontal coordinates.

[0090] Step S1-1-2-3, take the oil-stone ratio a1 corresponding to the maximum density, the oil-stone ratio a2 corresponding to the maximum stability, the oil-stone ratio a3 corresponding to the target porosity or the median of the target porosity, and the oil-stone ratio a4 corresponding to the median of the asphalt saturation range, and take the average of the four as the optimal oil-stone ratio initial value OAC1 according to the following formula.

[0091] OAC1=(a1+a2+a3+a4) / 4.

[0092] If the selected preset oil-to-rock ratio range does not cover the required range of asphalt saturation, the average value of the three oil-to-rock ratios is calculated as OAC1 according to the following formula.

[0093] OAC1=(a1+a2+a3) / 3.

[0094] If there is no density or stability peak within the selected preset asphalt-stone ratio range, the asphalt-stone ratio a3 corresponding to the target void ratio or the median of the target void ratio can be directly used as OAC1, but OAC1 must be within the range of OACmax to OACmin, otherwise the mix design should be redone.

[0095] Step S1-1-2-4, find the maximum asphalt-to-stone ratio OACmax and the minimum asphalt-to-stone ratio OACmin that can simultaneously meet various standards of the target asphalt mixture, and take the median OAC2. OAC2 = (OACmax + OACmin) / 2.

[0096] Step S1-1-2-5, take the median of OAC1 and OAC2 as the target mix ratio and the best asphalt-stone ratio OAC, and use it in combination with the regional climate characteristics, and the corresponding specimen void ratio is within the design requirements. If OAC1 is outside the above range, the gradation should be adjusted and the mix ratio design should be re-performed.

[0097] Step S1-1-3, test the performance of the target asphalt mixture. Specifically, prepare the target asphalt mixture according to the above mix ratio, and conduct dynamic stability, beam bending, immersion Marshall, freeze-thaw splitting tests. All indicators must meet the requirements of Table 2.

[0098]

[0099] Table 2 Technical standards for asphalt mixture

[0100] Among them, ATB-25, AC-20C and AC-13C in Table 2 are asphalt mixture gradings.

[0101] Step S1-2, mixing the target asphalt mixture with a laboratory mixer, and obtaining the produced asphalt mixture;

[0102] Step S1-3, performing a Marshall test on the produced asphalt mixture to verify the proportion of the produced asphalt mixture, includes:

[0103] Step S1-3-1, sampling from the hot material bin to obtain the material ratio of the production mineral material and mineral powder for producing the asphalt mixture, so that the production asphalt mixture ratio meets the target asphalt mixture ratio;

[0104] Step S1-3-2, determining the optimal oil-stone ratio OACz for producing the asphalt mixture; if the optimal oil-stone ratio for producing the asphalt mixture matches the optimal oil-stone ratio for the target asphalt mixture, proceed to step S1-3-3; if the optimal oil-stone ratio for producing the asphalt mixture does not match the optimal oil-stone ratio for the target asphalt mixture, repeat steps S1-3-1 and S1-3-2;

[0105] Step S1-3-2, determining the optimal asphalt-to-aggregate ratio OACz for producing asphalt mixture, comprises:

[0106] Step S1-3-2-1, taking the best asphalt-stone ratio OAC and three asphalt-stone ratios of OAC±0.3% of the target asphalt mixture,

[0107] Step S1-3-2-2, taking the production asphalt mixture calculated in step S1-3-2-1 and using it to prepare five groups of Marshall specimens of the production asphalt mixture for conducting a Marshall test of the production asphalt mixture;

[0108] Step S1-3-2-3, obtaining the density, stability-flow value, void ratio and asphalt saturation of each group of Marshall specimens for producing asphalt mixture;

[0109] Step S1-3-2-4, select the oil-stone ratio b1 corresponding to the maximum density of the asphalt mixture; select the oil-stone ratio b2 corresponding to the maximum stability of the asphalt mixture; select the oil-stone ratio b3 corresponding to the void ratio of the asphalt mixture being the target void ratio or the median void ratio; select the oil-stone ratio b4 when the asphalt saturation of the asphalt mixture is the median asphalt saturation, and take the average of the four as the optimal initial value OACx of the oil-stone ratio for the asphalt mixture according to the following formula; OACx = (b1 + b2 + b3 + b4) / 4;

[0110] Step S1-3-2-5, obtaining the maximum oil-stone ratio OACmax2 and the minimum oil-stone ratio OACmin2 of the asphalt mixture that can simultaneously meet the standards of density, stability-flow value, void ratio and asphalt saturation of the asphalt mixture, and taking the median value to obtain OACy; OACy = (OACmax2 + OACmin2) / 2;

[0111] Step S1-3-2-6, obtaining the optimal asphalt-aggregate ratio for producing asphalt mixture OACz=(OACx+OACy) / 2;

[0112] Step S1-3-2-7, compare OACz and OAC; if OACz / OAC≤0.2%, proceed to step S2, mix asphalt mixture; if OACz / OAC>0.2%, repeat steps S1-3-1 and S1-3-2.

[0113] Specifically, S1-3, verify the production ratio:

[0114] Step S1-3-1 determines the amount of mineral material and mineral powder in each hot material bin of the asphalt mixture intelligent mixing equipment. Specifically, the mineral material entering each hot material bin after the secondary screening in the subsequent step must be sampled and screened. According to the screening results, the gradation of the mixed mineral material is calculated to be close to the target mix ratio and meet the specifications, so as to determine the material ratio of mineral material and mineral powder in each hot material bin for use in the mixer control room, and at the same time repeatedly adjust the feed ratio of the cold material bin of the asphalt mixture intelligent mixing equipment to achieve balanced feed.

[0115] Step S1-3-2 determines the best asphalt-stone ratio OACz for producing asphalt mixture: take the best asphalt-stone ratio OAC and OAC±0.3% of the target mix ratio design, take the mixed mineral materials calculated above, use the laboratory small mixer to mix the asphalt mixture for Marshall test, draw and analyze according to the target mix ratio design method, and then determine the best asphalt-stone ratio OACz for the production mix ratio after obtaining OACx and OACy. The OACz determined by the above method may be inconsistent with the best asphalt-stone ratio OAC of the target mix ratio. If the difference does not exceed 0.2 percentage points, the test piece should be mixed and paved according to the OAC determined by the production mix ratio, or the asphalt-stone ratio for trial mixing and paving should be determined by analysis; if the difference exceeds 0.2 percentage points, the cause should be found out, and the asphalt-stone ratio for trial mixing and paving should be determined after further test analysis.

[0116] Step S1-3-3, check the performance of the produced asphalt mixture; if the performance of the produced asphalt mixture is within the design requirements, proceed to step S2, and carry out asphalt mixture mixing construction; if the performance of the produced asphalt mixture is not within the design requirements, repeat steps S1-3-1 to S1-3-3.

[0117] Specifically, asphalt mixture is prepared and produced according to the mix ratio obtained above, and dynamic stability, beam bending, immersion Marshall, and freeze-thaw splitting tests are carried out.

[0118] Step S2, checking whether the asphalt mixture intelligent mixing equipment meets the start-up conditions, including:

[0119] Check whether the intelligent mixing equipment for asphalt mixture has reached normal operation. Specifically, before the equipment is started, the staff will check the surroundings of the machine to ensure that the start of the machine will not cause casualties; first inspect the various parts of the equipment, mainly observe the rotating parts, pipeline seals and electrical wiring, and confirm that there is no abnormality in the equipment. At the same time, the fault detection module of the automatic control system is used to check whether the raw materials such as sand and gravel, asphalt, etc. can meet the production supply; check whether the amount of fuel oil meets the production consumption, check whether the heavy oil temperature is heated to a temperature that can meet the use of the burner; check whether the asphalt temperature meets the production requirements; check whether the heavy oil and asphalt pipelines, pumps, and valves are heated sufficiently and can operate normally. Among them, if the asphalt pipeline is normal, the asphalt circulation pump can be started so that the asphalt can be transported to the asphalt weighing valve for production use; check that the heavy oil and asphalt pipelines, pumps, and valves are heated sufficiently and can operate normally. If the asphalt pipeline is normal, the asphalt circulation pump can be started so that the asphalt can be transported to the asphalt weighing valve for production use. The fault detection module feedbacks the operating status of raw materials, oil quantity, oil temperature, and pipelines, pumps, and valves. If a fault is detected, the host computer of the automatic control system displays the specific location of the fault so that the staff can perform maintenance. If no fault occurs, the start module is turned on and the asphalt mixture intelligent mixing equipment is operated to proceed to step S3.

[0120] Step S3, shoveling and conveying the ore; using a loader to put the ore of different specifications into the corresponding cold material bin, and conveying the ore to the drum for heating through a belt conveyor; the cold material bin discharge port control module of the automatic control system controls the opening of the cold material bin discharge port, and the cold material bin is opened, and the ore that meets the production grading is poured into the belt conveyor according to the preset mix ratio; the belt conveyor module of the automatic control system controls the belt speed, and conveys the ore to the drum for heating through the belt conveyor.

[0121] Specifically, use a loader to shovel sand and gravel of different specifications into the corresponding cold material bin. During the loading process, attention should be paid to the quality of the raw materials to ensure that the quality of the mixed material meets the standard requirements. When loading with a loader, load the materials vertically from the bottom in sequence to reduce aggregate segregation.

[0122] The cold storage bin has multiple capacities of 6×18m 3 The cold material bin discharge port control module of the automatic control system controls the discharge port opening of each container respectively, and the pre-graded mineral materials are poured into the belt conveyor according to the preset mix ratio and volumetrically measured by the belt feeder. The belt conveyor module of the automatic control system controls the conveying speed of the belt, and then the belt conveyor is conveyed to the drum for drying. Among them, the cold material bin capacity used in this application is 6×18m 3 ; Feeding width 4m; Feeding height 3.4m; Belt conveyor capacity 500t / h.

[0123] Step S4: heating, drying and lifting materials; adding the materials to the drum for drying the materials to form hot aggregates; using the elevator to transport the hot aggregates to a higher place and unloading them into the hot aggregate screening machine. The heating temperature of the drum is controlled by the drum heating module of the automatic control system, where the heating temperature of the materials is 10℃ to 30℃ higher than the heating temperature of the asphalt used in the subsequent mixing operation.

[0124] Specifically, the ore conveyed from the feeding belt of the cold material bin enters the drum from the feed box for drying. The drum dries and heats the ore to a certain temperature in a countercurrent heating manner. The drum heating module of the automatic control system automatically adjusts the flame of the burner. Due to the rotation of the drum, the ore is repeatedly lifted and dropped by the blades in the drum to form a material curtain, which enhances the heat exchange effect. In addition, with the help of the inclination of the drum, the ore continues to move forward while being heated. After coming out of the drum outlet, together with the coarse powder collected by the gravity dust collector, it is lifted and transported to a high place by the hot aggregate elevator and unloaded into the hot aggregate screening machine.

[0125] At the same time, temperature control is a key factor in asphalt mixing. The drum heating module of the automatic control system performs intelligent temperature control and intelligent temperature adjustment monitoring on the mixture in the drum. Specifically, when igniting and loading: start each fuel supply pump, open the induced draft fan damper to 10 degrees, and press the ignition button to ignite. When the inlet temperature of the unit dust collector reaches 60-70°C, open the cold material bin to load the material according to the production mix ratio requirements. The belt conveyor module and the drum heating module cooperate with each other so that the loading speed gradually increases from low speed to faster as the drum temperature rises, so as to ensure that the mixture quickly enters the drum and the drum temperature can rise rapidly. When the drum temperature rises to 100°C, the temperature of the induced draft fan damper is gradually increased to 40°C. Under normal circumstances, the drum temperature should be maintained between 150 and 170°C. The specific temperature depends on the climate conditions and transportation distance.

[0126] Step S5: Dust removal: Settle and filter the combustion exhaust gas, water vapor, dust generated in the drum and the dust collected from the vibrating screen in the main building, and discharge the gas that meets the environmental protection requirements. Specifically, the function of the dust removal system is to settle and filter the combustion exhaust gas, water vapor, dust generated in the drum and the dust collected from the vibrating screen in the main building, and discharge the gas that meets the environmental protection requirements.

[0127] The high-temperature dusty flue gas discharged from the drum first enters the gravity dust collector through the primary flue for preliminary purification. The collected powder is sent to the inlet of the hot aggregate elevator by the screw conveyor, and then the dusty flue gas enters the bag dust collector. The purified flue gas is directly discharged into the atmosphere by the induced draft fan. The dust recovered by the bag dust collector is sent to the recovered powder supply system by the screw conveyor for storage. Dust particles with a particle size of ≥0.075mm are separated and collected by the gravity dust collector, and dust particles with a particle size of <0.075mm are filtered and settled by the bag dust collector.

[0128] The flue gas direct-fired burner is set up with two modes: combustion mode and environmental protection mode. The combustion mode is used to dry the mineral material, and it also has the functions of flue gas collection combustion and dust collection. In addition to the normal production operation of the asphalt mixing plant, no additional operation is required to achieve the environmental protection effect. The environmental protection mode is used to collect flue gas and dust after stopping combustion. After turning on the environmental protection mode, the opening of the induced draft fan needs to be increased to ensure negative pressure. Select the burner mode to operate according to the actual situation.

[0129] The dust removal system operates under negative pressure, and the air pressure and air volume are controlled by adjusting the opening of the induced draft fan damper. Frequency conversion technology is also used to control the air volume.

[0130] Step S6: Screening, metering, and conveying hot aggregate; the hot aggregate identification module of the automatic control system identifies the hot aggregate model and the hot aggregate level, and conveys the hot aggregate to the corresponding silo through the second belt.

[0131] Step S6-1, screening, screening hot aggregate in a hot aggregate screening machine; the hot aggregate is screened into several specifications by the screening machine, and each specification of hot aggregate falls into a corresponding hot material storage compartment for storage.

[0132] Step S6-2, metering: according to the set ratio, hot aggregates of each specification are put into the stone metering bin in batches in the order of small to large, and the amount of hot aggregate put into the hot material storage compartment is controlled by the hot aggregate metering module of the automatic control system, and the hot aggregates are put into their respective metering devices for metering according to the set ratio. Specifically, according to the ratio of the asphalt mixture, the hot aggregates are metered by the hot aggregate scale and unloaded into the agitator from the unloading door, which is driven by a cylinder to open and close. In order to accurately display the storage capacity of the system's hot aggregates, each hot aggregate bin is equipped with a continuous level meter, which can accurately display the material level of each hot aggregate bin through the upper computer monitoring interface used by the automatic control system, so as to make timely adjustments to the mineral supply speed of the cold bin in step S3.

[0133] Step S6-3, conveying hot aggregate; after weighing, putting the hot aggregate into the stirring pot for forced stirring according to a preset sequence.

[0134] Step S7: Stirring the mixture to form an asphalt mixture; the mixture includes: hot aggregate, powder, asphalt or modified asphalt. Asphalt or modified asphalt mainly plays a bonding role, and is used as a binder to mix the hot aggregate and powder.

[0135] Among them, the modified asphalt can be prepared on-site by using a stirring method or a mixing method.

[0136] Stirring method: This method is applicable to various modifiers that can be directly mixed with asphalt evenly through the stirring process. The stirring method is to directly add the modifier into the hot asphalt, and through mechanical strong stirring, the modifier particles and asphalt are mixed at high temperature to prepare modified asphalt with the required modifier content. The mixing time, temperature, stirring speed, etc. when producing modified asphalt by the stirring method should be determined through experimental research.

[0137] Mixing method: The mixing method should use high-speed shearing equipment or colloid mill. The mixing time, temperature, number of times and other parameters of the modified asphalt produced by the mixing method should be set according to different base asphalts, modifiers and equipment capabilities. Detailed production processes, operating procedures and product quality control and inspection methods should be formulated before production. Modified asphalt should be used as it is produced at the construction site; when stored for a short time, it should be transferred to a storage tank and continuously stirred or pumped in circulation. The modified asphalt should not reduce its use effect during storage.

[0138] Step S7-1, heating asphalt or modified asphalt, keeping warm; using heat transfer oil to heat asphalt or modified asphalt. Heat transfer oil is a heat transfer medium, which is set in a closed circulation system. It absorbs the heat released by diesel combustion from the heat transfer oil furnace to increase the temperature. The high-temperature heat transfer oil heats the asphalt or modified asphalt and heavy oil through the circulation pipeline. After the heat is released, the heat transfer oil is heated again and circulated repeatedly until the asphalt or modified asphalt and heavy oil reach the required temperature.

[0139] The thermal oil heating module of the automatic control system uses an automatic burner to heat the thermal oil to 180-210°C, and through a circulating pump, it heats and insulates the asphalt tank, asphalt metering scale, heavy oil heater, heavy oil tank, asphalt and heavy oil pipelines, etc., heating the asphalt, heavy oil, etc. to the required temperature.

[0140] The asphalt heating temperature and asphalt mixture production temperature should be selected according to the asphalt type, grade, etc. as specified in Table 3.

[0141]

[0142] Table 3 Asphalt mixture production temperature (℃)

[0143] Step S7-2, metering and conveying asphalt or modified asphalt; according to the ratio of the asphalt mixture, the asphalt or modified asphalt is metered by an asphalt scale and unloaded into the mixer from the unloading valve; the cylinder drive module of the automatic control system controls the unloading valve driven by the cylinder to realize the opening and closing of the unloading valve.

[0144] Step S7-2-1, determining the temperature of asphalt or modified asphalt; if the temperature of asphalt or modified asphalt meets the set value, proceed to step S7-2-2; if the temperature of asphalt or modified asphalt does not meet the set value, repeat steps S7-1 to S7-2;

[0145] Step S7-2-2, initially measuring asphalt or modified asphalt; the asphalt circulation pump driving module of the automatic control system controls the motor speed of the asphalt circulation pump;

[0146] Step S7-2-3, secondary metering of asphalt or modified asphalt; the asphalt circulation pump drive module of the automatic control system controls the motor speed of the asphalt circulation pump;

[0147] Step S7-2-4, when the weight of the asphalt scale reaches the set upper limit or the asphalt scale liquid level switch is triggered, the automatic control system will alarm and automatically shut down the asphalt circulation pump, prohibiting further measurement.

[0148] Specifically, the asphalt circulation pump controls the hot asphalt to circulate in the pipeline to maintain a certain temperature and fluidity. When the asphalt temperature is lower than the setting value of the host computer of the automatic control system, the host computer system main screen will prompt that the asphalt temperature is low and automatically stop the asphalt circulation pump. During weighing, the metering valve cuts off the circulation loop, opens the metering loop, and the asphalt will directly enter the asphalt scale. In order to achieve the purpose of accurate metering, the asphalt circulation pump is controlled by the asphalt circulation pump drive module of the automatic control system. During the first metering, the asphalt circulation pump drive module of the automatic control system controls the motor of the asphalt circulation pump to run quickly to speed up the time for asphalt to enter the asphalt scale and shorten the batching time; during the second metering, the asphalt circulation pump drive module of the automatic control system controls the motor of the asphalt circulation pump to run at a low speed so that the asphalt enters slowly, thereby improving the metering accuracy. When the weight measured by the asphalt scale reaches the set upper limit value or triggers the asphalt scale liquid level switch, the host computer alarm prompts the asphalt circulation pump drive module to automatically shut down the asphalt circulation pump and prohibit further metering.

[0149] Step S7-3, metering and conveying mineral powder: According to the ratio of asphalt mixture, the powder metering module of the automatic control system measures the mineral powder and other powders through the powder scale and discharges them into the mixing device from the powder discharge valve. When the weight measured by the powder scale reaches the set upper limit, the upper computer of the automatic control system will alarm and automatically close the mineral powder bin door, prohibiting further metering.

[0150] The automatic control system involved in this application relies on the signals detected by various sensors to monitor important parameters such as material ratio, asphalt content, and mixture temperature in real time, thereby ensuring that the quality of the produced mixture can meet the user's requirements. The volumetric measurement of mineral materials through the belt feeder is a pre-measurement, and the measurement of screened hot aggregate, powder and hot asphalt is a precise measurement. Because there is a secondary measurement before mixing the mixture, it can ensure the gradation of the mixture and the high-precision ratio of hot aggregate, powder and asphalt. At present, the static measurement accuracy of hot aggregate and powder does not exceed ±0.5%, and the static measurement accuracy of asphalt does not exceed ±0.25%. Due to intermittent mixing, it is also very convenient to change the mixture ratio, and the formula can be changed or replaced without stopping the machine.

[0151] Step S7-4, stir the mixture; the asphalt mixture should be mixed evenly, and all mineral materials should be completely coated with asphalt binder. The mixing time of each pot of the intermittent mixer should be 30 to 50 seconds, of which the dry mixing time should not be less than 5 seconds. Specifically, the hot aggregate metering module, the asphalt circulation pump drive module and the powder metering module will mix the hot aggregate, asphalt or modified asphalt and mineral powder respectively after the production mix ratio is metered, and the agitator is controlled by the mixing module to mix evenly. The agitator structure is a double-horizontal shaft type, and the two agitator shafts are synchronized by a coupling, with equal speed and opposite rotation direction. Multiple sets of stirring arms are installed on the shaft, and the arm ends are connected with wear-resistant blades with bolts.

[0152] Step S8: Storing asphalt mixture; the flap-type finished product silo is placed under the main mixing building. The finished mixture and waste materials are directly slid into the corresponding storage silo through the rotatable flap door controlled by the storage module. The entire conveying channel is in a closed state. The door panel is driven by a cylinder. The finished product silo body is insulated with rock wool board and the exterior is installed with color steel corrugated board. The storage silo has the advantages of environmental protection, heat preservation, energy saving and reliability.

[0153] Step S9: Discharging and loading. The unloading module controls the unloading door, and the stirred asphalt mixture is discharged from the unloading door at the bottom and loaded into the dump truck.

[0154] The preferred temperature control of the asphalt mixture intelligent mixing construction method involved in the present application is as follows: the heating of asphalt or modified asphalt is controlled at 150-170°C, the mineral material temperature is 10-20°C higher than that of asphalt, the factory temperature of the mixture is 140-155°C, and the factory temperature of the finished asphalt mixture directly affects the paving quality and rolling quality. When transported to the paver for use, the temperature of the finished asphalt mixture is controlled between 135 and 150°C, the initial rolling temperature cannot be lower than 135°C, and the final rolling temperature is not lower than 110°C. It is not higher than 60°C when open to traffic. The temperature of the finished material is detected at any time during the production process and fed back to the operation room in time to strictly control the temperature.

[0155] Under normal circumstances, the construction temperature should be selected according to the asphalt grade, type and dosage of modifier, viscosity, climate conditions and thickness of the pavement layer within the range specified in Table 4. However, if the test section or construction practice proves that the temperature specified in the table does not conform to the actual situation, appropriate adjustments are allowed.

[0156]

[0157]

[0158] Table 4 Construction temperature control table

[0159] The temperature of asphalt mixture should be measured with an insertion digital thermometer with a metal detection needle, and glass thermometers should not be used. When measuring on a material transport vehicle, it is advisable to drill a small hole under the side panel of the vehicle and insert at least 15 cm to measure. The rolling temperature can be measured by drilling holes in the road surface with a metal screwdriver several times.

[0160] The above are merely embodiments of the present invention and are not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention are included in the scope of the claims of the present invention to be approved.

Claims

1. An intelligent asphalt mixture mixing construction method, characterized in that: The method comprises the following steps: Step S1: construction preparation, comprising: Step S1-1, designing a target asphalt mixture ratio, includes: Step S1-1-1, determining the composition ratio of each mineral material used to constitute the target asphalt mixture; Step S1-1-2, mixing the target asphalt mixture with a small laboratory mixer to determine the optimal asphalt-to-aggregate ratio OAC of the target asphalt mixture; Step S1-1-3, testing the target asphalt mixture performance; Step S1-2, mixing the target asphalt mixture with a laboratory mixer to obtain a production asphalt mixture; Step S1-3, performing a Marshall test on the produced asphalt mixture to verify the mix ratio of the produced asphalt mixture, comprises: Step S1-3-1, sampling from the hot material bin to obtain the material ratio of the production mineral material and mineral powder for producing the asphalt mixture, so that the production asphalt mixture ratio meets the target asphalt mixture ratio; Step S1-3-2, determining the optimal oil-stone ratio of the asphalt mixture to be produced; if the optimal oil-stone ratio of the asphalt mixture to be produced matches the optimal oil-stone ratio of the target asphalt mixture, proceeding to step S1-3-3; if the optimal oil-stone ratio of the asphalt mixture to be produced does not match the optimal oil-stone ratio of the target asphalt mixture, repeating steps S1-3-1 and S1-3-2; Step S1-3-3, checking the performance of the produced asphalt mixture; if the performance of the produced asphalt mixture is within the design requirements, proceed to step S2, and perform asphalt mixture mixing construction; if the performance of the produced asphalt mixture is not within the design requirements, repeat steps S1-3-1 to S1-3-3; Step S2, checking whether the asphalt mixture intelligent mixing equipment meets the start-up conditions; if the start-up conditions are met, proceeding to step S3; Step S3: shoveling and conveying the ore; using a loader to put the ore of different specifications into the corresponding cold material bin, and conveying the ore to the drum for heating through a belt conveyor; Step S4: heating, drying and raising the material; adding the drum to dry the mineral material to form hot aggregate; using the elevator to transport the hot aggregate to a higher place and unloading it into the hot aggregate screening machine; Step S5: dust removal; the combustion exhaust gas, water vapor, dust generated in the drum and the dust collected from the vibrating screen in the main building are settled and filtered to discharge gas that meets environmental protection requirements; Step S6: screening, metering, and conveying hot aggregate; the control system automatically identifies the hot aggregate model and the hot aggregate level, and conveys the hot aggregate to the corresponding silo via a belt; Step S7: stirring the mixture to form an asphalt mixture; the mixture includes: hot aggregate, powder, asphalt or modified asphalt; Step S7-1, heating asphalt or heating modified asphalt, and keeping the asphalt or modified asphalt warm; Step S7-2, metering asphalt or modified asphalt and delivering the asphalt or modified asphalt; Step S7-3, measuring the mineral powder and conveying the mineral powder; Step S7-4, stirring the mixture; Step S8: storing the asphalt mixture; Step S9: loading the asphalt mixture onto a truck.

2. The asphalt mixture intelligent mixing construction method according to claim 1, characterized in that: The step S1-1-2, mixing the target asphalt mixture with a laboratory small mixer to determine the optimal asphalt-to-stone ratio OAC of the target asphalt mixture, includes: Step S1-1-2-1, using the mineral materials constituting the target asphalt mixture, within a preset asphalt-rock ratio range, changing at intervals of 0.5%, taking five different asphalt-rock ratios to prepare five groups of Marshall specimens of the target asphalt mixture; Step S1-1-2-2, obtaining the density, stability-flow value, void ratio and asphalt saturation of each group of the Marshall specimens; Step S1-1-2-3, select the asphalt-stone ratio a1 corresponding to the maximum density; select the asphalt-stone ratio a2 corresponding to the maximum stability; Select the porosity to be the target porosity or the oil-stone ratio a3 corresponding to the median porosity; Select the asphalt-stone ratio a4 with the asphalt saturation as the median asphalt saturation, and take the average of the four as the optimal initial value of the asphalt-stone ratio OAC1 according to the following formula; OAC1=(a1+a2+a3+a4) / 4; Step S1-1-2-4, obtaining the maximum asphalt-rock ratio OACmax1 and the minimum asphalt-rock ratio OACmin1 that can simultaneously meet the density, stability-flow value, void ratio and asphalt saturation standards of the target asphalt mixture, and taking the median OAC2; OAC2 = (OACmax1 + OACmin1) / 2; If OAC1 is outside the range of OACmin1 to OACmax1, repeat steps S1-1-1 to S1-1-2 to adjust the gradation and re-design the mix ratio; Step S1-1-2-5, obtaining the optimal asphalt-aggregate ratio of the target asphalt mixture OAC=(OAC1+OAC2) / 2.

3. The asphalt mixture intelligent mixing construction method according to claim 2, characterized in that: If the asphalt saturation range exceeds the corresponding preset oil-to-stone ratio range, the average value of the three oil-to-stone ratios is calculated as the optimal initial value of the oil-to-stone ratio OAC1 according to the following formula: OAC1 = (a1 + a2 + a3) / 3.

4. The asphalt mixture intelligent mixing construction method according to claim 2, characterized in that: If the peak value of density or stability appears outside the corresponding preset asphalt-stone ratio range, the asphalt-stone ratio a3 corresponding to the target porosity or the median porosity is used as OAC1.

5. The asphalt mixture intelligent mixing construction method according to claim 1, characterized in that: Step S1-3-2, determining the optimal asphalt-to-aggregate ratio OACz for producing the asphalt mixture, comprises: Step S1-3-2-1, taking the optimal asphalt-stone ratio OAC of the target asphalt mixture, and three asphalt-stone ratios of OAC+0.3% and OAC-0.3%, Step S1-3-2-2, taking the production asphalt mixture calculated in step S1-3-2-1 and using it to prepare five groups of Marshall specimens of the production asphalt mixture for conducting a Marshall test of the production asphalt mixture; Step S1-3-2-3, obtaining the density, stability-flow value, void ratio and asphalt saturation of each group of Marshall specimens for producing asphalt mixture; Step S1-3-2-4, select the oil-stone ratio b1 corresponding to the maximum density of the asphalt mixture; select the oil-stone ratio b2 corresponding to the maximum stability of the asphalt mixture; select the oil-stone ratio b3 corresponding to the void ratio of the asphalt mixture being the target void ratio or the median void ratio; select the oil-stone ratio b4 when the asphalt saturation of the asphalt mixture is the median asphalt saturation, and take the average of the four as the optimal initial value OACx of the oil-stone ratio for the asphalt mixture according to the following formula; OACx = (b1 + b2 + b3 + b4) / 4; Step S1-3-2-5, obtaining the maximum oil-stone ratio OACmax2 and the minimum oil-stone ratio OACmin2 of the asphalt mixture that can simultaneously meet the standards of density, stability-flow value, void ratio and asphalt saturation of the asphalt mixture, and taking the median value to obtain OACy; OACy = (OACmax2 + OACmin2) / 2; Step S1-3-2-6, obtaining the optimal asphalt-to-aggregate ratio OACz=(OACx+OACy) / 2 for producing the asphalt mixture; Step S1-3-2-7, compare OACz and OAC; if OACz / OAC≤0.2%, proceed to step S2, mix asphalt mixture; if OACz / OAC>0.2%, repeat steps S1-3-1 and S1-3-2.

6. The asphalt mixture intelligent mixing construction method according to claim 1, characterized in that: The step S3 also includes: the automatic control system controls the opening of the cold material bin outlet, the cold material bin is opened, and the ore materials meeting the production grading are poured onto the belt conveyor according to a preset mix ratio; the automatic control system controls the belt speed, and the ore materials are transported to the drum for heating through the belt conveyor.

7. The asphalt mixture intelligent mixing construction method according to claim 1, characterized in that: The step S4 also includes: controlling the heating temperature of the drum by an automatic control system, and the heating temperature of the mineral material is 10° C. to 30° C. higher than the heating temperature of the asphalt or modified asphalt.

8. The asphalt mixture intelligent mixing construction method according to claim 1, characterized in that: The step S5 also includes: dust particles with a particle size of ≥0.075 mm are separated and collected by a gravity dust collector, and dust particles with a particle size of <0.075 mm are filtered and settled by a bag dust collector.

9. The asphalt mixture intelligent mixing construction method according to claim 1, characterized in that: The step S6 further comprises: Step S6-1, screening, screening hot aggregate in a hot aggregate screening machine; screening the hot aggregate into multiple specifications by the screening machine, and each specification of hot aggregate falls into a corresponding hot material storage compartment for storage; Step S6-2, metering; according to the set ratio, each specification of hot aggregate is put into the stone metering bin in batches in the order of small first and large later for cumulative metering, and the amount of hot aggregate put into the hot material storage compartment is controlled by the automatic control system, and is put into the respective metering devices for metering according to the set ratio; Step S6-3, conveying hot aggregate; after weighing, putting the hot aggregate into the stirring pot for forced stirring according to a preset sequence.

10. The asphalt mixture intelligent mixing construction method according to claim 1, characterized in that: The step S7-2 further includes: Step S7-2-1, determining the temperature of asphalt or modified asphalt; if the temperature of asphalt or modified asphalt meets the set value, proceed to step S7-2-2; if the temperature of asphalt or modified asphalt does not meet the set value, repeat steps S7-1 to S7-2; Step S7-2-2, initial metering of asphalt or modified asphalt; the automatic control system controls the motor speed of the asphalt circulation pump; Step S7-2-3, secondary metering of asphalt or modified asphalt; the automatic control system controls the motor speed of the asphalt circulation pump; Step S7-2-4, when the weight of the asphalt scale reaches the set upper limit or the asphalt scale liquid level switch is triggered, the automatic control system will alarm and automatically shut down the asphalt circulation pump, prohibiting further measurement.

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