CN112030670A - Equipment and process for preparing asphalt mixture - Google Patents

Abstract

An equipment and a process for preparing asphalt mixture comprise a primary cold batching and conveying system, a regenerated cold batching and conveying system, a stirring system, a primary material drying and heating system, a powder supply system, a primary big cloth bag dust removal system, a primary cold batching conveying area dust removal system, a powder spraying system, an asphalt supply system, an asphalt tank flue gas treatment system, a waste gas treatment system and a finished product conveying and storing system. According to the invention, the primary drying roller is arranged above the stirring system, so that the heat loss in the process of lifting the hot aggregate by the traditional equipment is avoided, and the energy is saved; the primary big bag-type dust collector is arranged above the primary drying drum, so that the recovered powder can be conveyed to the recovered powder bin only through the recovered powder screw conveyor without arranging a powder lifter, and the equipment cost is reduced. In addition, a regenerative drying roller, a regenerative hot material temporary storage bin and a regenerative hot material metering scale are not required to be arranged, the structure is simple, and the problem of material sticking of the regenerative drying roller, which cannot be solved in the current industry, is avoided.

Description

Equipment and process for preparing asphalt mixture

Technical Field

The invention relates to the field of asphalt mixture production equipment, in particular to equipment and a process for preparing an asphalt mixture.

Background

Asphalt mixture production equipment on the market mainly has two forms: one is forced intermittent asphalt mixture stirring equipment; the other is a continuous asphalt mixture stirring device. The forced intermittent asphalt mixture stirring equipment is equipment for drying, heating, screening and metering sand and stone materials, adding a proper amount of filler (stone powder), uniformly stirring the sand and stone powder and hot asphalt liquid according to a certain mixing ratio to form an asphalt mixture, when the plant-mixed hot regeneration equipment is matched, drying, heating, storing and metering the reclaimed materials, and then putting the metered reclaimed materials into a stirring cylinder to be stirred with the virgin materials to form the asphalt mixture; the continuous asphalt mixture stirring equipment is equipment which continuously measures sand stone materials or reclaimed materials with specifications according to the grading requirement, conveys the sand stone materials or the reclaimed materials to a drying and heating system for heating, continuously conveys the dried and heated aggregates and the reclaimed materials to a stirring cylinder, and stirs the aggregates and the reclaimed materials together with the asphalt and the stone powder which are continuously measured according to the grading requirement into the asphalt mixture. Because the forced intermittent asphalt mixture stirring equipment needs to perform complicated actions such as intermittent metering, emptying, re-metering and the like, the equipment yield is low due to periodic influence, the mechanical failure rate is high, the continuous asphalt mixture stirring equipment is not influenced by the periodicity, a vibrating screen, a heat storage bin, an aggregate metering scale and the like do not need to be configured, the structure is simpler, the mechanical failure rate is lower, and the continuous asphalt mixture stirring equipment is more and more popular in the market along with the rise of aggregate shaping equipment.

However, in both the forced batch type asphalt mixing plant and the continuous type asphalt mixing plant, the following problems are present in the prior art: 1. the primary drying roller is placed on the ground, the aggregates dried and heated by the drying roller are conveyed to a vibrating screen through a lifter for screening or conveyed to a stirring cylinder for stirring, and large heat loss exists in the hot aggregate conveying process; 2. the primary bag-type dust collector is arranged on the ground, the recovered powder needs to be lifted to a powder tank through a powder lifter, dust leakage points are increased in the conveying process, the purchase cost of the powder lifter is increased, and the failure rate of equipment is increased; 3. the configured regeneration equipment adopts the drying roller to dry and heat the regeneration materials, the heated regeneration materials need to be stored in a temporary storage bin, the regeneration materials are easy to adhere to the drying roller and the temporary storage bin after being heated, no radical treatment method is found in the industry at present, and a plurality of risks are brought to the normal production of the equipment.

Disclosure of Invention

The invention provides equipment and a process for preparing an asphalt mixture, and mainly aims to overcome the defects.

In order to solve the technical problems, the invention adopts the following technical scheme:

an apparatus for preparing an asphalt mixture comprising

The primary cold batching measuring and conveying system comprises a plurality of primary cold bins and a primary conveying device, wherein the primary conveying device is used for receiving and measuring the primary materials discharged by the primary cold bins and conveying the primary materials to a primary material drying and heating system;

the regenerative cold batching metering and conveying system comprises a plurality of regenerative cold bins and a regenerative conveying device, wherein the regenerative conveying device is used for receiving and metering the regenerative materials discharged by the regenerative cold bins and conveying the regenerative materials to the stirring system;

the stirring system comprises one or more stages of stirring cylinders which are arranged in series;

the primary material drying and heating system comprises a primary drying roller and a primary burner for heating the primary drying roller, wherein the primary drying roller is arranged above the stirring system so that the material in the primary drying roller can fall into the stirring system for stirring;

the powder supply system comprises a recovered powder bin, an ore powder bin and a recovered powder conveying device, wherein the recovered powder conveying device is used for receiving and metering the recovered powder discharged from the recovered powder bin and conveying the recovered powder to the stirring system;

the primary big bag-type dust removal system comprises a big bag-type dust remover and a recycling powder spiral conveyor, wherein the big bag-type dust remover is arranged above the primary material drying and heating system, so that flue gas generated by the primary material drying and heating system can be sent into the big bag-type dust remover through an inlet of the big bag-type dust remover to be treated, and recycling powder obtained after the treatment of the big bag-type dust remover can be transmitted into the recycling powder bin through the recycling powder spiral conveyor;

the primary cold batching and conveying area dust removal system comprises a small bag-type dust remover and a collecting hopper, wherein an inlet of the small bag-type dust remover is communicated with a primary cold bin to absorb dust generated by the primary cold bin, and the collecting hopper is used for receiving recovered powder obtained after the treatment of the small bag-type dust remover;

the powder spraying system comprises a first Roots blower and a second Roots blower, the first Roots blower is used for conveying the recovered powder in the collecting hopper to the recovered powder bin, and an air inlet of the second Roots blower is communicated with the ore powder bin, and an air outlet of the second Roots blower is respectively communicated with an inlet of the large bag-type dust collector and an inlet of the small bag-type dust collector;

the asphalt supply system comprises a plurality of asphalt tanks and an asphalt conveying device, wherein the asphalt conveying device is used for receiving and metering asphalt discharged by the asphalt tanks and conveying the asphalt to the stirring system;

the asphalt tank flue gas treatment system is used for conveying the asphalt flue gas generated by the asphalt tank to an inlet of the small bag-type dust collector;

the waste gas treatment system comprises a primary gravity dust removal chamber, a secondary gravity dust removal chamber and a regeneration fan; the air inlet of the primary gravity dust removal chamber is communicated with the stirring system, and sediments in the primary gravity dust removal chamber can fall back to the stirring system; the air inlet of the secondary gravity dust removal chamber is communicated with the air outlet of the primary gravity dust removal chamber, the first air outlet is communicated with the primary drying roller through the regeneration fan, and sediments in the secondary gravity dust removal chamber can fall back to the regeneration conveying device;

the finished product material conveying and storing system comprises an embedded scraper conveyor and a plurality of finished product bins, wherein the embedded scraper conveyor is arranged below the stirring system so as to convey materials discharged by the stirring system to the finished product bins.

Preferably, the system also comprises a regenerative hot air generating system and a regenerative additive system, wherein the regenerative hot air generating system comprises an inverted L-shaped hearth and a regenerative burner for heating the inverted L-shaped hearth, and a hot flue gas outlet of the inverted L-shaped hearth is communicated with the stirring system; the additive regeneration system comprises an additive metering device and a spraying device, wherein the spraying device is connected with the additive metering device to spray additive onto regenerated materials on the regeneration conveying device.

Preferably, the waste gas treatment system further comprises a return air fan, and a second air outlet of the secondary gravity dust removal chamber is communicated with the air inlet of the inverted L-shaped hearth through the return air fan.

Preferably, the fuel supply system further comprises at least one oil tank, a primary fuel pump and a regenerative fuel pump, wherein the primary fuel pump is connected with the oil tank and the primary burner, and the regenerative fuel pump is connected with the oil tank and the regenerative burner.

Preferably, the stirring system comprises a first-stage stirring cylinder and a second-stage stirring cylinder, the first-stage stirring cylinder is arranged above the second-stage stirring cylinder, a discharge hole of the first-stage stirring cylinder is connected with a feed hole of the second-stage stirring cylinder, and materials on the primary drying roller, the recovered powder conveying device and the asphalt conveying device can be conveyed into the first-stage stirring cylinder; and the discharge hole of the second-stage stirring cylinder is positioned above the buried scraper conveyor, and the air inlet of the first-stage gravity dust removal chamber is communicated with the second-stage stirring cylinder.

Preferably, the primary conveying device comprises a plurality of primary variable-frequency feeding belt conveyors, primary belt weighers, primary aggregate belt conveyors, primary scalers, primary inclined belt conveyors and primary cold material elevators, wherein the primary variable-frequency feeding belt conveyors are positioned below the primary cold material bin and vertically correspond to the discharge holes of the primary cold material bin; the primary belt scale can convey the raw materials on the primary belt scale to the primary aggregate belt conveyor; the primary raw material on the primary raw material collecting belt conveyor can be conveyed to the primary screen and then falls onto the primary inclined belt conveyor; the primary inclined belt conveyor can convey the primary raw materials on the primary inclined belt conveyor to the lower side of the primary cold material hoister; the primary cold material hoister can lift primary materials into the primary drying roller.

Preferably, the recovered powder conveying device comprises a spiral scale and a powder feeding conveying screw machine, wherein the spiral scale and the powder feeding conveying screw machine can be automatically calibrated and weighed, the spiral scale is correspondingly arranged below the recovered powder bin to receive the recovered powder discharged by the recovered powder bin, and the spiral scale can convey the recovered powder on the spiral scale to the powder feeding conveying screw machine; the powder feeding and conveying screw machine can convey the recovered powder on the powder feeding and conveying screw machine to the stirring system.

Preferably, the asphalt conveying device comprises an asphalt replenishing pump, an asphalt scale and an asphalt spraying pump, wherein a liquid level detection assembly is arranged on the asphalt scale, the asphalt replenishing pump is communicated with the asphalt tank and the asphalt scale, and a discharge port of the asphalt scale is connected to the stirring system through the asphalt spraying pump.

Preferably, the asphalt tank flue gas treatment system comprises a gas collecting device and a centrifugal fan, wherein the gas collecting device is used for collecting the asphalt flue gas in the asphalt tank, and the gas inlet side of the centrifugal fan is connected with the gas collecting device and the gas outlet side of the centrifugal fan extends to an inlet connected with the small bag-type dust collector.

A process for manufacturing an asphalt mixture, comprising the steps of:

1) heating an asphalt tank in an asphalt supply system, and starting an asphalt tank flue gas treatment system and a powder spraying system at the same time;

2) calibrating a primary conveying device and/or a regeneration conveying device, an asphalt conveying device and a recovery powder conveying device;

3) when the temperature of the asphalt heavy oil reaches the production temperature, starting a primary big cloth bag dust removal system and a primary cold burden conveying area dust removal system;

4) starting a primary cold batching and conveying system and/or a regeneration cold batching and conveying system, a stirring system, a primary material drying and heating system, a waste gas treatment system, a powder supply system, an asphalt supply system and a finished product material conveying and storing system;

5) if the regenerative cold ingredient metering and conveying system in the step 4 is started, the regenerative hot air generating system can be started or not started;

6) if the regenerative cold ingredient metering delivery system in step 4 has been activated, the regenerative additive system may or may not be selected to be activated, and if the regenerative hot air generation system in step 5 has been activated, the regenerative additive system must be activated.

Compared with the prior art, the invention has the beneficial effects that:

1. according to the invention, the primary drying roller is arranged above the stirring system, so that the heat loss in the process of lifting the hot aggregate by the traditional equipment is avoided, and the energy is saved; the primary big bag-type dust collector is arranged above the primary drying drum, so that the recovered powder can be conveyed to the recovered powder bin only through the recovered powder screw conveyor without arranging a powder lifter, and the equipment cost is reduced. In addition, the invention does not need to arrange a regenerative drying roller, a regenerative hot material temporary storage bin and a regenerative hot material metering scale, has simple structure and avoids the problem of material sticking of the regenerative drying roller which can not be solved in the industry at present.

2. The invention can implement four ways of preparing the asphalt mixture, has the function of one machine with multiple purposes and can adapt to different engineering requirements.

3. According to the invention, a vibrating screen, a heat storage bin, an aggregate weighing scale and the like are not required to be configured, continuous metering and batching are realized by arranging the primary belt scale and the like which can automatically calibrate and weigh, the equipment yield is greatly improved, in addition, the structure is simpler, the mechanical failure rate is lower, the main building height is low, and the building construction is convenient.

Drawings

FIG. 1 is a schematic structural diagram of the present invention.

Fig. 2 is a schematic structural diagram of the primary cold ingredient metering and conveying system of the present invention.

FIG. 3 is a schematic structural diagram of the regenerative cold ingredient metering delivery system of the present invention.

Fig. 4 is a schematic structural diagram of the mixing system and the raw material drying and heating system of the present invention.

FIG. 5 is a schematic structural view of the combination of the raw big bag dust removal system and the raw material drying and heating system according to the present invention.

FIG. 6 is a schematic view showing the construction of an asphalt supply system according to the present invention.

Detailed Description

The following describes embodiments of the present invention with reference to the drawings.

Refer to fig. 1, 2, 3, 4, 5, and 6. An apparatus for preparing an asphalt mixture comprising

The primary cold batching measuring and conveying system 1 comprises a plurality of primary cold material bins 11 and primary conveying devices 12, wherein the primary conveying devices 12 are used for receiving and measuring primary materials discharged from the primary cold material bins 11 and conveying the primary materials to the primary material drying and heating system 4;

the regenerative cold batching metering and conveying system 2 comprises a plurality of regenerative cold bins 21 and a regenerative conveying device 22, wherein the regenerative conveying device 22 is used for receiving and metering the regenerative materials discharged from the regenerative cold bins 21 and conveying the regenerative materials to the stirring system 3;

the stirring system 3 comprises one-stage or multi-stage stirring cylinders which are arranged in series;

the primary material drying and heating system 4 comprises a primary drying roller 41 and a primary burner 42 for heating the primary drying roller 41, wherein the primary drying roller 41 is arranged above the stirring system 3, so that the material in the primary drying roller 41 can fall into the stirring system 3 for stirring;

a powder supply system 5 including a recovered powder bin 51, a mineral powder bin 52, and a recovered powder conveying device 53, wherein the recovered powder conveying device 53 is used for receiving and metering the recovered powder discharged from the recovered powder bin 51 and conveying the recovered powder to the stirring system 3;

the primary big bag dust removal system 6 comprises a big bag dust remover 61 and a recycling powder screw conveyor 62, wherein the big bag dust remover 61 is arranged above the primary material drying and heating system 4, so that the flue gas generated by the primary material drying and heating system 4 can be sent into the big bag dust remover 61 through an inlet 611 of the big bag dust remover 61 for treatment, and the recycling powder obtained after the treatment of the big bag dust remover 61 can be sent into the recycling powder bin 51 through the recycling powder screw conveyor 62;

the raw cold batching and conveying area dust removal system 7 comprises a small bag-type dust remover 71 and a collecting hopper 72, wherein an inlet 711 of the small bag-type dust remover 71 is communicated with the raw cold bin 11 to absorb dust generated by the raw cold bin 11, and the collecting hopper 72 is used for receiving recovered powder obtained after the treatment of the small bag-type dust remover 71;

the powder spraying system 8 comprises a first roots blower 81 and a second roots blower 82, wherein the first roots blower 81 is used for conveying the recovered powder in the collecting hopper 72 to the recovered powder bin 51, and an air inlet 821 of the second roots blower 82 is communicated with the ore powder bin 52, and an air outlet 822 is respectively communicated with an inlet 611 of the large bag-type dust collector 61 and an inlet 711 of the small bag-type dust collector 71;

an asphalt supply system 9 comprising a plurality of asphalt tanks 91, an asphalt conveying device 92, the asphalt conveying device 92 being used for receiving and metering asphalt discharged from the asphalt tanks 91 and conveying the asphalt to the stirring system 3;

the asphalt tank flue gas treatment system 1a is used for conveying asphalt flue gas generated by an asphalt tank to an inlet 711 of a small bag-type dust collector 71;

the waste gas treatment system 2a comprises a primary gravity dust removal chamber 2a1, a secondary gravity dust removal chamber 2a2, a regeneration fan 2a3 and a return air fan 2a 4; the air inlet of the primary gravity dust chamber 2a1 is communicated with the stirring system 3, and the sediment in the primary gravity dust chamber 2a1 can fall back to the stirring system 3; an air inlet of the secondary gravity dust chamber 2a2 is communicated with an air outlet of the primary gravity dust chamber 2a1, a first air outlet is communicated with the primary drying roller 41 through a regeneration fan 2a3, and sediments in the secondary gravity dust chamber 2a2 can fall back to the regeneration conveying device 22;

a finished product material conveying and storing system 3a, which comprises an embedded scraper conveyor 3a1 and a plurality of finished product bins 3a2, wherein the embedded scraper conveyor 3a1 is arranged below the stirring system 3 to convey the materials discharged by the stirring system 3 to the finished product bins 3a 2;

the regeneration hot air generation system 4a comprises an inverted L-shaped hearth 4a1 and a regeneration burner 4a2 for heating the inverted L-shaped hearth 4a1, and a hot flue gas outlet of the inverted L-shaped hearth 4a1 is communicated with the stirring system 3;

a regeneration additive system 5a comprising an additive metering device 5a1, a spraying device 5a2, the spraying device 5a2 being connected to the additive metering device 5a1 for spraying additive onto the regeneration material on the regeneration delivery device 22;

a fuel supply system 6a comprising at least one oil tank 6a1, a native fuel pump 6a2, a regenerative fuel pump 6a3, the native fuel pump 6a2 connecting the oil tank 6a1 with the native burner 42, the regenerative fuel pump 6a3 connecting the oil tank 6a1 with the regenerative burner 4a 2;

and the lane flue gas treatment system 7a is used for absorbing dust generated when the loader loads materials into the primary cold storage bin.

According to the invention, the primary drying roller 41 is arranged above the stirring system 3, so that the heat loss in the process of lifting the hot aggregate by the traditional equipment is avoided, and the energy is saved; the primary big bag-type dust collector is arranged above the primary drying drum, so that the recovered powder can be conveyed to the recovered powder bin only through the recovered powder screw conveyor without arranging a powder lifter, and the equipment cost is reduced. In addition, the invention does not need to arrange a regenerative drying roller, a regenerative hot material temporary storage bin and a regenerative hot material metering scale, has simple structure and avoids the problem of material sticking of the regenerative drying roller which can not be solved in the industry at present.

In particular, the method of manufacturing a semiconductor device,

refer to fig. 1, 2, 3, 4, 5, and 6. The primary conveying device 12 comprises a plurality of primary variable-frequency feeding belt conveyors 121 which are positioned below the primary cold bin 11 and vertically correspond to the discharge hole of the primary cold bin 11, a primary belt weigher 122 which is arranged below the primary variable-frequency feeding belt conveyors 121 in a one-to-one correspondence manner and can automatically calibrate and weigh, a primary aggregate belt conveyor 123 arranged below the primary belt weigher 122, a primary screen 124, a primary inclined belt conveyor 125 and a primary cold material elevator 126; the raw materials in the raw cold bin 11 can fall onto a raw variable-frequency feeding belt conveyor 121 and then are conveyed to a raw belt scale 122 for weighing, and the raw materials on the raw belt scale 122 can be conveyed to a raw aggregate belt conveyor 123; the primary raw material on the primary aggregate belt conveyor 123 can be conveyed to a primary screen 124 and then falls onto a primary inclined belt conveyor 125; the primary inclined belt conveyor 125 can convey the primary raw materials thereon to the lower side of the primary cold material elevator 126; the primary cold charge elevator 126 can elevate the primary charge into the primary drying drum 41.

When the native belt scale 122 is used, if the weight reading of the native belt scale 122 corresponding to the computer display is consistent with the weight of the self-calibration weight 1221, the next production can be carried out; if the weight reading of the primary belt scale 122 corresponding to the computer display is inconsistent with the weight of the automatic calibration weight 1221, recalibration is needed, the AD value of the lower computer is changed, and the next production is carried out after calibration. The raw materials are weighed by the weighing group 1222 on the raw material belt scale 122, the weight signal is fed back to the lower computer in real time to calculate the conveying capacity of the raw materials, and the conveying capacity is compared with the preset formula, when the deviation is found, the frequency of the raw material variable-frequency feeding belt conveyor 121 can be automatically adjusted according to the program programmed by the lower computer, so that the conveying capacity of the raw materials is adjusted, and the consistency with the preset formula is ensured. The continuously metered primary material is conveyed to the primary drying roller 41 for continuous drying and heating through the primary aggregate belt conveyor 123, the primary screen 124, the primary inclined belt conveyor 125 and the primary cold material hoister 126 in sequence, and then enters the stirring system 3 to be mixed with the asphalt and the recycled powder which are conveyed in a calibrated and continuously metered manner to produce the asphalt mixture.

Refer to fig. 1, 2, 3, 4, 5, and 6. The regeneration conveying device 22 comprises a plurality of regeneration variable-frequency feeding belt conveyors 221 which are positioned below the regeneration cold bin 21 and vertically correspond to the discharge hole of the regeneration cold bin 21, regeneration belt weighers 222 which are arranged below the regeneration variable-frequency feeding belt conveyors 221 in a one-to-one correspondence manner and can automatically calibrate and weigh, regeneration aggregate belt conveyors 223, regeneration primary screens 224, regeneration inclined belt conveyors 225 and regeneration cold material elevators 226 which are arranged below the regeneration belt weighers 222; the reclaimed materials in the reclaimed cold storage bin 21 can fall onto a reclaimed variable-frequency feeding belt conveyor 221 and then are conveyed to a reclaimed belt scale 222 for weighing, and the reclaimed materials on the reclaimed belt scale 222 can be conveyed to a reclaimed aggregate belt conveyor 223; the regenerated aggregate belt conveyor 223 can convey the regenerated materials on the regenerated aggregate belt conveyor to a regenerated primary screen 224 and then fall onto a regenerated inclined belt conveyor 225; the regeneration inclined belt conveyor 225 can convey the regenerated materials on the regeneration inclined belt conveyor to the lower side of a regeneration cold material elevator 226; the regeneration cold elevator 226 can raise the regeneration into the blending system.

When the regenerated belt scale 222 is used, if the weight reading of the regenerated belt scale 222 corresponding to the computer display is consistent with the weight of the automatic calibration weight 2221, the next production step can be carried out; if the weight reading of the regenerated belt scale 222 corresponding to the computer display is inconsistent with the weight of the automatic calibration weight 2221, recalibration is needed, the AD value of the lower computer is changed, and the next production is carried out after calibration. The reclaimed materials are weighed by the weighing group 2222 on the reclaimed belt scale 222, weight signals can be fed back to the lower computer in real time to calculate the conveying capacity of the reclaimed materials, the conveying capacity of the reclaimed materials is compared with a preset formula, and when deviation is found, the frequency of the regenerated variable-frequency feeding belt conveyor 221 can be automatically adjusted according to a program programmed by the lower computer, so that the conveying capacity of the reclaimed materials is adjusted, and the condition that the conveying capacity of the reclaimed materials is consistent with the preset formula is ensured. The continuously metered reclaimed materials are conveyed to the stirring system 3 by a reclaimed aggregate belt conveyor 223, a reclaimed primary screen 224, a reclaimed inclined belt conveyor 225 and a reclaimed cold material lifter 226 in sequence and are mixed with the asphalt and the reclaimed powder which are conveyed in a calibrated and continuously metered manner to produce the asphalt mixture.

Refer to fig. 1, 2, 3, 4, 5, and 6. The stirring system 3 comprises a first-stage stirring cylinder 31 and a second-stage stirring cylinder 32, wherein the first-stage stirring cylinder 31 is arranged above the second-stage stirring cylinder 32, a discharge hole 312 of the first-stage stirring cylinder 31 is connected with a feed hole 321 of the second-stage stirring cylinder 32, and materials in the primary drying roller 41, the recovered powder conveying device 53 and the asphalt conveying device 92 can be conveyed into the first-stage stirring cylinder 31; the discharge port 322 of the secondary mixing cylinder 32 is positioned above the buried scraper conveyor 3a1, and the air inlet of the primary gravity dust chamber 2a1 is communicated with the secondary mixing cylinder 32.

Wherein, upper cover 311 is installed to one-level agitator 31 upside, and the material on primary drying drum 41, recovery powder conveyor 53, pitch conveyor 92 can convey to upper cover 311, reentrant one-level agitator 31 stirring, and the misce bene in one-level agitator 31 can fall into second grade agitator 32 through its discharge gate 312 and continue the stirring, and the misce bene in the second grade agitator 32 can fall into through discharge gate 322 and carry out the conveying on buried scraper conveyor 3a 1. The primary gravity dust removal chamber 2a1 is positioned above the secondary stirring cylinder 32, and the air inlet 2a11 of the primary gravity dust removal chamber 2a1 is communicated with the upper cover of the secondary stirring cylinder 32, so that dust generated in the operation of the secondary stirring cylinder 32 can flow upwards into the primary gravity dust removal chamber 2a1, and sediments in the primary gravity dust removal chamber 2a1 can fall back to the secondary stirring cylinder 32 for reuse; an air inlet 2a21 of the secondary gravity dust removal chamber 2a2 is communicated with an air outlet 2a12 of a primary gravity dust removal chamber 2a1, a first air outlet 2a22 of the secondary gravity dust removal chamber 2a2 is communicated with the primary drying roller 41 through a regeneration fan 2a3 so that the flue gas subjected to sedimentation treatment can be sent to the primary drying roller 41 by the regeneration fan for secondary combustion treatment, recycling is realized, and a heat exchanger 2a31 is arranged on an air pipe connected with the regeneration fan 2a 3; the second gas outlet 2a23 of the two-stage gravity dust removal chamber 2a2 is communicated with the gas inlet of the inverted L-shaped hearth through the air return fan 2a4 so as to cool the inverted L-shaped hearth, and a heat exchanger 2a41 is arranged on a wind pipe connected with the air return fan 2a 4.

In addition, the sediment in the secondary gravity dust removal chamber 2a2 can fall back to the regeneration conveying device 22 for reuse, specifically, the sediment in the secondary gravity dust removal chamber 2a2 falls back to the regeneration cold burden hoisting machine 226, and is conveyed to the primary stirring cylinder 31 through the upper cover 311 for reuse. The hot flue gas generated by the inverted-L-shaped hearth 4a1 can be conveyed to the primary stirring cylinder 31 and the secondary stirring cylinder 32 to heat the materials. The inverted L-shaped hearth 4a1 and the inner side of the upper cover of the stirring cylinder are both paved with high-temperature resistant ceramic fiber cotton for heat insulation.

The first-stage mixing cylinder 31 and the second-stage mixing cylinder 32 are horizontal shaft type forced mixing cylinders, and the mixing blades are arranged in a special design of 'two-in one-out' mode, namely, a plurality of feeding mixing groups are arranged on the mixing shaft at intervals, a material returning mixing group is arranged behind every two feeding mixing groups, the opening degree of a discharging door of the mixing cylinder is adjustable, the mixing and heat exchange time can be prolonged or shortened as required, and in addition, the mixing cylinders are provided with heat conduction oil heating and outer-wrapped heat insulation cotton heat preservation.

Refer to fig. 1, 2, 3, 4, 5, and 6. The primary drying roller 41 is obliquely arranged, and the lower discharging side 411 of the primary drying roller is downwards opposite to the upper cover 311 of the primary mixing cylinder 31, so that the dried and heated aggregate can directly slide into the primary mixing cylinder 31; the inlet 611 of the large bag-type dust collector 61 is connected with the air outlet on the upper side of the primary drying drum 41, so that the flue gas generated by the primary drying drum 41 can sequentially pass through the air outlet of the primary drying drum 41 and the inlet 611 of the large bag-type dust collector 61 and enter the large bag-type dust collector 61 for treatment.

Refer to fig. 1, 2, 3, 4, 5, and 6. The mineral powder bin 52 in the powder supply system 5 is integrally installed on the upper side of the recovered powder bin 51, the recovered powder conveying device 53 comprises a spiral scale 531 and a lower powder conveying screw 532 which can be automatically calibrated and weighed, the spiral scale 531 is correspondingly arranged below the recovered powder bin 51 to receive the recovered powder discharged from the recovered powder bin 51, and the spiral scale 531 can convey the recovered powder on the spiral scale 531 to the lower powder conveying screw 532; the lower powder conveying screw 532 can convey the recovered powder thereon to the stirring system.

Wherein, the discharging side of the powder feeding screw conveyor 532 is downward opposite to the upper cover 311 of the first-stage mixing cylinder 31, so that the recovered powder can directly fall into the first-stage mixing cylinder 31; the spiral scale 531 is provided with an automatic calibration weight 5311 and a weighing group 5312 for calibration, and when the spiral scale 531 is used, if the weight reading of the spiral scale 531 corresponding to the computer display is consistent with the weight of the automatic calibration weight 5311, the next production can be carried out; if the weight reading of the spiral scale 531 corresponding to the computer display is inconsistent with the weight of the automatic calibration weight 5311, recalibration is needed, the AD value of the lower computer is changed, and the next production is carried out after calibration. The recovered powder is weighed by the weighing group 5312 on the spiral scale 531, the weight signal can be fed back to the lower computer in real time to calculate the conveying capacity of the recovered powder, and compared with the preset formula, when deviation is found, the frequency of the powder feeding conveying spiral machine 532 can be automatically adjusted according to the program programmed by the lower computer, so that the conveying capacity of the recovered powder is adjusted, and the consistency with the preset formula is ensured. The continuously metered recycled powder is conveyed by the powder feeding conveying screw 532 to enter the first-stage stirring cylinder 31 to be mixed with the asphalt and the primary material which are conveyed by the calibrated continuous metering to produce the asphalt mixture.

Refer to fig. 1, 2, 3, 4, 5, and 6. In the primary big cloth bag dust removing system 6, the recovered powder obtained after the treatment of the big cloth bag dust remover 61 can automatically fall onto the recovered powder screw conveyor 62 for transmission, and the recovered powder on the recovered powder screw conveyor 62 is conveyed to fall into the recovered powder bin 51 for collection; in addition, the air pipe of the big bag-type dust collector 61 for discharging the purified tail gas is also provided with a heat exchanger 612, so that the tail gas can exchange heat with air before being discharged.

Refer to fig. 1, 2, 3, 4, 5, and 6. The upper sides of the plurality of cold material bins 11 are provided with bin top dust suction devices 13 for absorbing dust in the cold material bins 11, the bin top dust suction devices 13 are communicated to inlets 711 of the small bag-type dust collectors 71 through dust suction pipes 14, and recovered powder generated after treatment of the small bag-type dust collectors 71 can fall downwards onto the dust collection spiral 73 to be conveyed and is conveyed into the dust collection hopper 72 on the lower side of the dust collection spiral.

The lane flue gas treatment system 7a comprises an air suction cover 7a1 and an axial flow fan 7a2, wherein the air suction cover 7a1 is positioned above the primary cold storage bin 11, the air suction cover 7a1 extends to be communicated with an inlet 711 of a small bag-type dust collector 71 through a smoke pipe, and the axial flow fan 7a2 is used for absorbing dust generated when the loader is loaded to the primary cold storage bin through the air suction cover 7a1 and conveying the dust to the small bag-type dust collector 71 for treatment.

Refer to fig. 1, 2, 3, 4, 5, and 6. Pitch conveyor 92 includes pitch additional pump 921, pitch is called 922, pitch spray pump 923, and pitch additional pump 921 intercommunication pitch jar 91 is called 922 with pitch, and pitch is called the discharge gate of 922 to be connected to mixing system through pitch spray pump 923.

A liquid level detection assembly is arranged on the asphalt scale 922, when the asphalt scale 922 is at a low position, the asphalt supplement pump 921 supplements asphalt for the asphalt scale 922, and when the asphalt scale 922 reaches a high position, the asphalt supplement pump 921 stops working; the asphalt spraying pump 923 can be frequency-variable, and the supply amount of asphalt is adjusted by adjusting the frequency of the asphalt spraying pump 923. The asphalt scale 922 is provided with an automatic calibration weight 9221 for calibration, and when the asphalt scale 922 corresponding to the computer display is used, if the weight reading of the asphalt scale 922 is consistent with the weight of the automatic calibration weight 9221, the next production can be carried out; if the weight reading of the asphalt scale 922 corresponding to the computer display is inconsistent with the weight of the automatic calibration weight 9221, recalibration is needed, the AD value of the lower computer is changed, and the next production is carried out after calibration. The continuously metered asphalt enters the primary stirring cylinder 31 through the conveying of the asphalt spraying pump 923 to be mixed with the recovery powder and the primary material which are also conveyed through calibration and continuous metering to produce the asphalt mixture.

Refer to fig. 1, 2, 3, 4, 5, and 6. The asphalt tank flue gas treatment system 1a comprises a gas collecting device 1a1 for collecting asphalt flue gas in an asphalt tank 91 and a centrifugal fan 1a2, wherein the gas inlet side of the centrifugal fan 1a2 is connected with the gas collecting device 1a1, and the gas outlet side of the centrifugal fan extends to an inlet 711 connected with a small bag-type dust collector 71. The invention effectively maintains the environment in the workshop by arranging various dust removal systems.

Refer to fig. 1, 2, 3, 4, 5, and 6. The embedded scraper conveyors 3a1 in the finished product conveying and storing system 3a are obliquely arranged, the lower feeding side 3a11 of the embedded scraper conveyor 3a1 is positioned below the discharge port of the secondary stirring cylinder 32, and the plurality of finished product bins 3a2 are respectively arranged on the upper discharge side 3a12 of the embedded scraper conveyor 3a1, namely, the mixture discharged by the secondary stirring cylinder 32 can move upwards along the embedded scraper conveyor 3a1 and fall into the finished product bins 3a 2. The finished product material is conveyed by the embedded scraper conveyor, has good sealing performance, can prevent asphalt smoke gas leakage and the like, and meets the requirement of environmental protection.

Refer to fig. 1, 2, 3, 4, 5, and 6. In the reclaimed additive system 5a, the spraying device 5a2 can spray the additive onto the reclaimed material on the reclaimed aggregate belt 223.

The automatic calibration weight is lifted up or down by the driving of the cylinder, so that the primary belt scale, the regenerative belt scale or the spiral scale can bear load or not bear load when being calibrated. According to the invention, by designing the continuous metering and batching mode of the primary belt scale, the regenerative belt scale and the spiral scale, the equipment yield is greatly improved, in addition, a vibrating screen, a heat storage bin, an aggregate metering scale and the like are not required to be configured, the structure is simpler, the mechanical failure rate is lower, the main building height is low, and the building construction is convenient.

Refer to fig. 1, 2, 3, 4, 5, and 6. A process for manufacturing an asphalt mixture, comprising the steps of:

1) heating an asphalt tank in an asphalt supply system 9, and starting an asphalt tank flue gas treatment system 1a and a powder spraying system 8 at the same time;

2) calibrating the primary conveyor 12 and/or the reclaim conveyor 22, the asphalt conveyor 92, the reclaimed powder conveyor 53;

3) when the temperature of the asphalt heavy oil reaches the production temperature, starting a primary big cloth bag dust removal system 6 and a primary cold batching and conveying area dust removal system 7;

4) starting a primary cold batching and conveying system 1 and/or a regeneration cold batching and conveying system 2, a stirring system 3, a primary material drying and heating system 4, a waste gas treatment system 2a, a powder supply system 5, an asphalt supply system 9 and a finished product material conveying and storing system 3 a;

5) if the regenerative cold ingredient metering and conveying system 2 in the step 4 is started, the regenerative hot air generating system 4a can be started or not;

6) if the regenerative cold ingredient dosing system 2 has been activated in step 4, the regenerative additive system 5a may or may not be activated, and if the regenerative hot air generation system 4a has been activated in step 5, the regenerative additive system 5a has to be activated.

Specifically, the process of the invention can prepare the asphalt mixture by adopting the following four ways.

The first embodiment is as follows: preparing the asphalt mixture from the pure primary material.

The embodiment is that only a primary unit is opened, primary materials such as sandstone materials and the like with specifications are continuously measured according to the grading requirement and are conveyed to a primary material drying and heating system for heating, the dried and heated primary materials are continuously conveyed to a stirring system, and the primary materials, the asphalt and the reclaimed powder which are continuously measured according to the grading requirement are stirred together to form the asphalt mixture with excellent quality. The method specifically comprises the following steps:

before the actual production, the asphalt tank 91 in the asphalt supply system 9 is heated by heating the asphalt heavy oil, and the asphalt tank flue gas treatment system 1a and the powder spraying system 8 are started simultaneously to perform the 'powder wrapping' treatment on the asphalt flue gas generated by the asphalt tank 91. When the temperature of the asphalt heavy oil reaches the production temperature, entering a formal production link, calibrating the primary belt scale 122, the spiral scale 531 and the asphalt scale 922, and if the weight reading of the corresponding scale displayed by the computer display is consistent with the weight of the weight, entering the next production step; and if the weight reading of the corresponding scale displayed by the computer display is inconsistent with the weight of the weight, recalibrating is needed, the AD value of the lower computer is changed, and the next production is carried out after calibration. And then, sequentially starting the large bag-type dust collector 61, the primary cold batching and conveying area dust removing system 7, the lane flue gas treatment system 7a, the embedded scraper conveyor 3a1, the secondary stirring cylinder 32, the primary stirring cylinder 31, the primary drying roller 41, the primary burner 42, the primary cold material elevator 126, the primary inclined belt conveyor 125, the primary screen 124, the primary aggregate belt conveyor 123, each primary belt scale 122 and the corresponding primary variable-frequency feeding belt conveyor 121, wherein the starting of each primary belt scale 122 and the corresponding primary variable-frequency feeding belt conveyor 121 should be sequentially delayed from the direction far away from the primary cold material elevator 126 to the primary cold material elevator 126. The aggregates of all specifications are weighed by the primary belt weigher, weight signals can be fed back to the lower computer in real time to calculate the conveying capacity of the aggregates of all specifications, the conveying capacity of the aggregates of all specifications is compared with a preset formula, and when deviation is found, the frequency of the primary variable-frequency feeding belt conveyor 121 can be automatically adjusted according to a program programmed by the lower computer, so that the conveying capacity of the aggregates of all specifications is adjusted, and the aggregates of all specifications are ensured to be consistent with the preset formula. The continuously metered aggregates of various specifications are conveyed into a primary drying roller 41 for continuous drying and heating through a primary aggregate belt conveyor 123, a primary screen 124, a primary inclined belt conveyor 125 and a primary cold aggregate elevator 126 in sequence, and then are conveyed into a stirring system 3 to be mixed with the asphalt and the recycled powder which are conveyed in a calibrated and continuously metered mode to produce the asphalt mixture.

Example two: the raw materials are added with a certain proportion of the reclaimed materials to prepare the asphalt mixture.

The embodiment is that a primary unit and a regeneration unit are simultaneously opened, primary materials such as sand and stone materials with specifications are continuously measured according to the grading requirement and are conveyed to a primary material drying and heating system for heating, dried and heated aggregates are continuously conveyed to a stirring system, and the aggregates are stirred with the regenerated materials (the regenerated materials are dried and heated in a primary stirring cylinder and a primary stirring cylinder while being stirred), regeneration additives (optionally added or not added), asphalt and recovery powder which are continuously measured according to the grading requirement to prepare the asphalt mixture. The method specifically comprises the following steps:

the adding method of the raw material is the same as that of the first embodiment, and is not described again. The addition of the regeneration materials is that the production mode of adding a certain proportion of regeneration materials according to the design formula requirements starts a primary unit according to the mode one, and in addition, a regeneration hot air generation system 4a, a regeneration cold material elevator 226, a regeneration inclined belt conveyor 225, a regeneration coarse screen 224, a regeneration aggregate belt conveyor 223, each regeneration belt scale 222 and a corresponding regeneration variable frequency feeding belt conveyor 221 are sequentially started, and the starting of each regeneration belt scale 222 and the corresponding regeneration variable frequency feeding belt conveyor 221 is delayed and started from the direction far away from the regeneration cold material elevator 226 to the regeneration cold material elevator 226. The calibration and metering of each regenerative belt scale and the adjustment principle of the conveying amount of the regenerative materials are consistent with the calibration and metering of the primary belt scale and the adjustment principle of the conveying amount of the aggregate. In addition, the regeneration additive system 5a can be started as required, and the regeneration additives are uniformly sprayed on the regeneration materials on the regeneration aggregate belt conveyor 223 during production, so that the reaction time of the regeneration additives and the regeneration materials is prolonged, and the effect of the regeneration additives is fully exerted. The production mode is that the sand and stone materials with the specification are continuously measured and conveyed to a primary material drying and heating system for heating according to the grading requirement, the dried and heated aggregate is continuously conveyed to a stirring system, and the dried and heated aggregate and the reclaimed material, the asphalt and the reclaimed powder which are continuously measured according to the grading requirement are stirred together to produce the asphalt mixture.

Example three: and (4) preparing the asphalt mixture by hot mixing the fully reclaimed materials.

In this embodiment, only the regeneration unit needs to be started, the starting manner of the regeneration unit is the same as that in the third embodiment, that is, the regeneration hot air generation system 4a, the regeneration cold material elevator 226, the regeneration inclined belt conveyor 225, the regeneration coarse screen 224, the regeneration aggregate belt conveyor 223, each regeneration belt scale 222 and the corresponding regeneration variable frequency feeding belt conveyor 221 are started in sequence, and the starting of each regeneration belt scale 222 and the corresponding regeneration variable frequency feeding belt conveyor 221 should be started in sequence in a delayed manner from a position far away from the regeneration cold material elevator 226 to the direction of the regeneration cold material elevator 226. Meanwhile, a primary big cloth bag dust removal system 6, a primary cold ingredient conveying area dust removal system 7, a lane flue gas treatment system 7a, a powder spraying system 8, a regenerated additive system 5a and an asphalt supply system 9 are started. The regeneration waste gas passes through the primary big cloth bag dust removal system 6 and the powder spraying system 8 and is treated in a powder wrapping smoke mode. According to the production mode, continuously metered reclaimed materials are conveyed to a stirring system according to the grading requirement, drying and heating are carried out while stirring is carried out, a certain proportion of reclaimed additives and asphalt are added according to the requirement, and the full reclaimed materials are subjected to hot mixing to prepare the asphalt mixture.

Example four: and (5) preparing the asphalt mixture by cold mixing the fully reclaimed materials.

The difference between the third embodiment and the second embodiment is that the regenerated hot air generation system 4a does not need to be started, and only the regenerated cold ingredient metering and conveying system 2, the regenerated additive system 5a, the stirring system 3, the finished product ingredient conveying and storing system 3a, the lane flue gas treatment system 7a and the primary cold ingredient conveying area dust removal system 7 need to be started, heating is not needed, and 100% of total reclaimed material is produced.

In the production mode, the regeneration hot air generation system of the regeneration unit does not need to be started, and only the lane flue gas treatment system 7a, the primary cold ingredient conveying area dust removal system 7, the finished product material conveying and storing system 3a, the stirring system 3, the regeneration cold ingredient metering and conveying system 2 and the regeneration additive system 5a need to be started (which can be started or not) in sequence; the starting mode of the regenerative cold batching measuring and conveying system 2 is to sequentially start a regenerative cold hoister 226, a regenerative inclined belt conveyor 225, a regenerative coarse screen 224, a regenerative aggregate belt conveyor 223, each regenerative belt scale 222 and a corresponding regenerative variable-frequency feeding belt conveyor 221 thereof, and the starting of each regenerative belt scale 222 and a corresponding regenerative variable-frequency feeding belt conveyor 221 thereof is to be sequentially delayed from a position far away from the regenerative cold hoister 226 to the direction of the regenerative cold hoister 226. The principles of calibration, metering and reclaimed material delivery adjustment for each reclaimed belt scale 222 are consistent with the calibration, metering and aggregate delivery adjustment for the virgin belt scale. In addition, the regeneration additive system can be started as required, and the regeneration additive is uniformly sprayed on the regeneration material of the regeneration aggregate belt conveyor 223 during production, so that the reaction time of the regeneration additive and the regeneration material is prolonged, and the effect of the regeneration additive is fully exerted. For review, the cold recycling production mode does not need heating, and 100 percent of total recycled materials are produced.

The invention can realize four ways of preparing the asphalt mixture, has the function of one machine with multiple purposes and can adapt to different engineering requirements.

The above examples are merely illustrative for clarity and are not intended to limit the embodiments. Other variations and modifications will be apparent to persons skilled in the art in light of the above description. And are neither required nor exhaustive of all embodiments. And obvious variations or modifications therefrom are within the scope of the invention.

Claims (10)

1. An apparatus for preparing an asphalt mixture, characterized in that: comprises that

The primary cold batching measuring and conveying system comprises a plurality of primary cold bins and a primary conveying device, wherein the primary conveying device is used for receiving and measuring the primary materials discharged by the primary cold bins and conveying the primary materials to a primary material drying and heating system;

the regenerative cold batching metering and conveying system comprises a plurality of regenerative cold bins and a regenerative conveying device, wherein the regenerative conveying device is used for receiving and metering the regenerative materials discharged by the regenerative cold bins and conveying the regenerative materials to the stirring system;

the stirring system comprises one or more stages of stirring cylinders which are arranged in series;

the primary material drying and heating system comprises a primary drying roller and a primary burner for heating the primary drying roller, wherein the primary drying roller is arranged above the stirring system so that the material in the primary drying roller can fall into the stirring system for stirring;

the powder supply system comprises a recovered powder bin, an ore powder bin and a recovered powder conveying device, wherein the recovered powder conveying device is used for receiving and metering the recovered powder discharged from the recovered powder bin and conveying the recovered powder to the stirring system;

the primary big bag-type dust removal system comprises a big bag-type dust remover and a recycling powder spiral conveyor, wherein the big bag-type dust remover is arranged above the primary material drying and heating system, so that flue gas generated by the primary material drying and heating system can be sent into the big bag-type dust remover through an inlet of the big bag-type dust remover to be treated, and recycling powder obtained after the treatment of the big bag-type dust remover can be transmitted into the recycling powder bin through the recycling powder spiral conveyor;

the primary cold batching and conveying area dust removal system comprises a small bag-type dust remover and a collecting hopper, wherein an inlet of the small bag-type dust remover is communicated with a primary cold bin to absorb dust generated by the primary cold bin, and the collecting hopper is used for receiving recovered powder obtained after the treatment of the small bag-type dust remover;

the powder spraying system comprises a first Roots blower and a second Roots blower, the first Roots blower is used for conveying the recovered powder in the collecting hopper to the recovered powder bin, and an air inlet of the second Roots blower is communicated with the ore powder bin, and an air outlet of the second Roots blower is respectively communicated with an inlet of the large bag-type dust collector and an inlet of the small bag-type dust collector;

the asphalt supply system comprises a plurality of asphalt tanks and an asphalt conveying device, wherein the asphalt conveying device is used for receiving and metering asphalt discharged by the asphalt tanks and conveying the asphalt to the stirring system;

the asphalt tank flue gas treatment system is used for conveying the asphalt flue gas generated by the asphalt tank to an inlet of the small bag-type dust collector;

the waste gas treatment system comprises a primary gravity dust removal chamber, a secondary gravity dust removal chamber and a regeneration fan; the air inlet of the primary gravity dust removal chamber is communicated with the stirring system, and sediments in the primary gravity dust removal chamber can fall back to the stirring system; the air inlet of the secondary gravity dust removal chamber is communicated with the air outlet of the primary gravity dust removal chamber, the first air outlet is communicated with the primary drying roller through the regeneration fan, and sediments in the secondary gravity dust removal chamber can fall back to the regeneration conveying device;

the finished product material conveying and storing system comprises an embedded scraper conveyor and a plurality of finished product bins, wherein the embedded scraper conveyor is arranged below the stirring system so as to convey materials discharged by the stirring system to the finished product bins.

2. The apparatus for preparing asphalt mixture according to claim 1, wherein: the system comprises a stirring system, a hot air generating system and a regeneration additive system, wherein the stirring system is used for stirring hot air in the inverted L-shaped hearth; the additive regeneration system comprises an additive metering device and a spraying device, wherein the spraying device is connected with the additive metering device to spray additive onto regenerated materials on the regeneration conveying device.

3. An apparatus for preparing asphalt mixture according to claim 2, wherein: the waste gas treatment system further comprises a return air fan, and a second gas outlet of the secondary gravity dust removal chamber is communicated with a gas inlet of the inverted L-shaped hearth through the return air fan.

4. An apparatus for preparing asphalt mixture according to claim 2, wherein: the fuel supply system comprises at least one oil tank, a primary fuel pump and a regenerative fuel pump, wherein the primary fuel pump is connected with the oil tank and the primary burner, and the regenerative fuel pump is connected with the oil tank and the regenerative burner.

5. The apparatus for preparing asphalt mixture according to claim 1, wherein: the stirring system comprises a primary stirring cylinder and a secondary stirring cylinder, the primary stirring cylinder is arranged above the secondary stirring cylinder, a discharge hole of the primary stirring cylinder is connected with a feed hole of the secondary stirring cylinder, and materials on the primary drying roller, the recovered powder conveying device and the asphalt conveying device can be conveyed into the primary stirring cylinder; and the discharge hole of the second-stage stirring cylinder is positioned above the buried scraper conveyor, and the air inlet of the first-stage gravity dust removal chamber is communicated with the second-stage stirring cylinder.

6. The apparatus for preparing asphalt mixture according to claim 1, wherein: the primary conveying device comprises a plurality of primary variable-frequency feeding belt conveyors, primary belt weighers, primary aggregate belt conveyors, primary screens, primary inclined belt conveyors and primary cold material elevators, wherein the plurality of primary variable-frequency feeding belt conveyors are positioned below the primary cold material bin and vertically correspond to the discharge hole of the primary cold material bin; the primary belt scale can convey the raw materials on the primary belt scale to the primary aggregate belt conveyor; the primary raw material on the primary raw material collecting belt conveyor can be conveyed to the primary screen and then falls onto the primary inclined belt conveyor; the primary inclined belt conveyor can convey the primary raw materials on the primary inclined belt conveyor to the lower side of the primary cold material hoister; the primary cold material hoister can lift primary materials into the primary drying roller.

7. The apparatus for preparing asphalt mixture according to claim 1, wherein: the recovered powder conveying device comprises a spiral scale and a powder feeding conveying screw machine, wherein the spiral scale and the powder feeding conveying screw machine can automatically calibrate and weigh, the spiral scale is correspondingly arranged below the recovered powder bin to receive the recovered powder discharged by the recovered powder bin, and the spiral scale can convey the recovered powder on the spiral scale to the powder feeding conveying screw machine; the powder feeding and conveying screw machine can convey the recovered powder on the powder feeding and conveying screw machine to the stirring system.

8. The apparatus for preparing asphalt mixture according to claim 1, wherein: the asphalt conveying device comprises an asphalt replenishing pump, an asphalt scale and an asphalt spraying pump, wherein a liquid level detection assembly is arranged on the asphalt scale, the asphalt replenishing pump is communicated with the asphalt tank and the asphalt scale, and a discharge port of the asphalt scale is connected to the stirring system through the asphalt spraying pump.

9. The apparatus for preparing asphalt mixture according to claim 1, wherein: the asphalt tank flue gas treatment system comprises a gas collecting device and a centrifugal fan, wherein the gas collecting device is used for collecting asphalt flue gas in the asphalt tank, the gas inlet side of the centrifugal fan is connected with the gas collecting device, and the gas outlet side of the centrifugal fan extends to be connected with the inlet of the small bag-type dust collector.

10. The process of the equipment for preparing the asphalt mixture is characterized by comprising the following steps:

1) heating an asphalt tank in an asphalt supply system, and starting an asphalt tank flue gas treatment system and a powder spraying system at the same time;

2) calibrating a primary conveying device and/or a regeneration conveying device, an asphalt conveying device and a recovery powder conveying device;

3) when the temperature of the asphalt heavy oil reaches the production temperature, starting a primary big cloth bag dust removal system and a primary cold burden conveying area dust removal system;

4) starting a primary cold batching and conveying system and/or a regeneration cold batching and conveying system, a stirring system, a primary material drying and heating system, a waste gas treatment system, a powder supply system, an asphalt supply system and a finished product material conveying and storing system;

5) if the regenerative cold ingredient metering and conveying system in the step 4 is started, the regenerative hot air generating system can be started or not started;

6) if the regenerative cold ingredient metering delivery system in step 4 has been activated, the regenerative additive system may or may not be selected to be activated, and if the regenerative hot air generation system in step 5 has been activated, the regenerative additive system must be activated.

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