CN109183583B

CN109183583B - Layered hot milling equipment, hot air microwave composite in-situ heat regeneration complete set unit and layered construction method thereof

Info

Publication number: CN109183583B
Application number: CN201811146029.5A
Authority: CN
Inventors: 任化杰; 张江勇; 张陈; 郑健龙; 焦生杰; 李家春; 陆平; 燕铎; 成九瑞; 理俊杰; 李骁斐; 樊丽丽; 张青国; 解睿; 丁艳; 顾海荣; 武浩浩; 郭荣东; 张青梅; 吴振毅
Original assignee: Jiangsu Jicui Road Engineering Technology And Equipment Research Institute Co ltd
Current assignee: Jiangsu Jicui Road Engineering Technology And Equipment Research Institute Co ltd
Priority date: 2018-09-29
Filing date: 2018-09-29
Publication date: 2020-07-21
Anticipated expiration: 2038-09-29
Also published as: WO2020062891A1; CN109183583A

Abstract

The invention discloses a layered hot milling device, a hot air and microwave combined in-place hot recycling complete set unit and a layered construction method thereof, wherein the layered hot milling device comprises a hot air heater, a front milling heater, a rear milling heater, a microwave tunnel heater, a feeding machine, a remixer and a remixer; by adopting the processes of hot-air layered heating, layered hot milling and planing, and layered conveying and heating on the asphalt pavement, semi-closed low-temperature construction is realized, the energy consumption is reduced, and the construction efficiency is improved; by adopting a novel modularized hot air variable power heating and microwave composite heating technology, the nondestructive, uniform and efficient heating of the asphalt pavement is realized, the performance of the asphalt pavement is recovered, the method is smokeless and environment-friendly, the heating depth is moderate, the interlayer temperature gradient is small, the hot milling and planing are in stepless matching damage, the temperature of the asphalt material in each link reaches the standard, and the construction quality is high; the addition of new materials adopts a combined mode of a dump truck and a multifunctional feeding machine, so that multi-freedom and multi-directional feeding is realized, feeding is accurate and continuous, and the temperature of the asphalt materials is reduced.

Description

Layered hot milling equipment, hot air microwave composite in-situ heat regeneration complete set unit and layered construction method thereof

Technical Field

The invention belongs to the technical field of road maintenance equipment, and particularly relates to layered hot milling equipment, a hot air and microwave combined in-situ heat regeneration complete set unit and a layered construction method thereof.

Background

The method is a technology for realizing regeneration of the old asphalt pavement in a certain depth range on the surface at one time by adopting special in-situ heat regeneration equipment to heat, mill and plane the asphalt pavement, then adding certain new aggregates, new asphalt, a regenerant and the like, and carrying out the working procedures of mixing, spreading, rolling and the like.

At present, the existing on-site heat regeneration units at home and abroad mainly have the following defects:

(1) scorching of road surface, damage of vegetation and environmental pollution. The pavement heater mostly adopts a fuel oil/gas open fire heating mode, a fuel gas infrared heating mode or a coarse high-power diesel hot air circulation heating mode, the heating temperature of the asphalt pavement is not easy to be accurately controlled, the asphalt pavement is easy to age and coke, and the pavement performance of the regenerated pavement is reduced; high-temperature hot smoke around construction easily causes scorching of green belts and trees, and is accompanied by a large amount of toxic blue smoke to pollute the environment;

(2) the deep disease cannot be treated, and the adaptability of the construction process is poor. In the existing local heat regeneration unit in the market, the one-time heating depth is mostly limited to 30-40 mm, so that the regeneration thickness is limited, deep diseases cannot be well treated, and the working condition adaptability is poor; in addition, from the construction process, only the material adding and re-mixing regeneration process and the re-mixing and paving process can be realized at present, the simultaneous in-situ thermal regeneration of the upper surface layer and the middle surface layer cannot be realized, a certain proportion of new asphalt mixture is not added in the re-mixing process of the re-mixing and paving process, a regeneration layer is formed by adding a proper amount of regenerant and re-mixing and paving, then the brand new asphalt mixture with a certain thickness is paved on the regeneration layer, and the true double-layer paving is not realized.

(3) The interlayer temperature gradient is large, aggregates are easy to damage during milling, the temperature of formed reclaimed materials is low, and the regeneration quality is influenced. According to statistics, the temperature of the asphalt material with the thickness of 10-20 mm at the upper part of the asphalt pavement is too high (up to 240 ℃), but the temperature of the asphalt material at the position of 30-50 mm at the lower part is only 70-80 ℃, the interlayer temperature gradient is large, and the heating is not uniform; moreover, because the temperature of the bottom layer is low, the phenomenon of the destruction (the occurrence of white materials) of aggregate gradation in the asphalt material in the milling process is easily caused, the comprehensive temperature of the formed reclaimed material is only about 120 ℃, the direct paving temperature is low, and the regeneration quality is influenced; the secondary temperature raising of the reclaimed materials is carried out by adopting infrared heating or hot air heating, the heating temperature is not easy to be accurately controlled, the secondary aging of the reclaimed materials is easy to cause, and the regeneration quality is influenced.

(4) The flue gas and dust leakage in the high-temperature pavement heating and hot milling links is large, and the environment is polluted. The local heat regeneration unit in the market lacks the measures of recycling and processing smoke and dust in the links of high-temperature pavement heating and hot milling, the emission does not reach the standard, and the national requirements of relevant environmental laws and regulations cannot be met.

(5) The addition of new materials is difficult, and the heat loss is large. The repeated mixing regenerator is operated intermittently frequently, which affects the regeneration quality. At present, the addition of a new asphalt mixture is mostly completed by adopting a transfer dump truck, a material pile with the thickness of 200-300 mm can be gathered after the heating and milling of a road surface, before the material addition of the transfer dump truck, a plurality of road surface heating machines and a heating milling machine need to move forward for 20-30 m, then the transfer dump truck crosses the material pile with the thickness, the transfer dump truck rides on the material pile and feeds the material pile into a hopper of a remixing regenerator, so that the remixing regenerator frequently stops operating, the thick material pile is driven out after the feeding is finished, then the plurality of heating machines and the heating milling machine retreat and return to the original position, and the operation is recovered.

Disclosure of Invention

Aiming at the problems, the invention provides a layered hot milling device, a hot air and microwave combined in-situ heat regeneration complete set unit and a layered construction method thereof, which adopt the processes of in-situ hot air layered heating, layered hot milling and layered conveying heating of an asphalt pavement, realize semi-closed low-temperature construction, reduce energy consumption and improve construction efficiency; meanwhile, a novel modular hot air variable power heating and 2.45GHz frequency microwave composite heating technology is adopted, so that the lossless, uniform and efficient heating of the asphalt material is realized, the performance of the asphalt road is recovered, the technology is smokeless and environment-friendly, the heating depth is moderate, the interlayer temperature gradient is small, the hot milling and planing are in stepless matching and damage, the temperature of the asphalt material in each link reaches the standard, and the construction quality is high; the addition of new materials adopts a combined mode of a dump truck and a multifunctional feeding machine, so that multi-degree-of-freedom and multi-direction feeding is realized, feeding is accurate and continuous, and the temperature of the asphalt materials is reduced; the unique re-mixing regenerator adopts a double-ironing plate and double-leveling design, can realize a brand-new material adding, re-mixing and paving regeneration process, considers the simultaneous material adding, re-mixing and regeneration process of the upper surface layer and the middle surface layer, realizes the real double-layer paving, and improves the regeneration quality of the asphalt pavement.

The technical purpose is achieved, the technical effect is achieved, and the invention is realized through the following technical scheme:

in a first aspect, the present disclosure provides a layered hot milling apparatus comprising: sequentially arranging a hot air heater, a front milling heater and a rear milling heater;

the hot air heater is used for heating the old asphalt pavement;

the front milling and heating machine comprises a front milling and heating machine body, a front milling device is arranged at the front part of the front milling and heating machine body, and a first inclined scraper material lifting unit and a first horizontal scraper material conveying and heating unit are sequentially arranged behind the front milling and heating device; a heating element is arranged below the first horizontal scraper material conveying and heating unit;

the rear milling and heating machine comprises a rear milling and heating machine body, a second inclined scraper lifting unit is arranged at the front part of the rear milling and heating machine body, a second horizontal scraper material conveying and heating unit is arranged behind the second inclined scraper material lifting unit, and a heating element is arranged below the second horizontal scraper material conveying and heating unit; the tail part of the rear milling heating machine body is provided with a rear milling device.

In a second aspect, the present invention provides a hot air microwave composite in-situ heat regeneration unit, including:

the layered hot milling apparatus of the first aspect;

microwave tunnel heating machine, microwave tunnel heating machine locates rearmounted milling and planing heating machine rear among the hot milling equipment of layering for heat the material of the equipment output of hot milling and planing of layering, it includes:

a microwave tunnel heater body;

the third inclined scraper lifting device is arranged below the foremost part of the microwave heater body;

the tunnel type horizontal material conveying unit comprises a closed cavity, a distributor, a microwave heating unit and a material conveying assembly, wherein the top of the closed cavity is provided with an inlet, and the bottom of the closed cavity is provided with an outlet; the distributing device is arranged at an inlet at the top of the closed cavity and is positioned above the inlet of the material conveying assembly; the microwave heating unit is arranged at the top of the closed cavity and is positioned above the material conveying assembly; the outlet end of the material conveying component is positioned above the outlet at the bottom of the closed cavity.

Preferably, the tunnel type horizontal material conveying unit further comprises a first suppressor and a second suppressor, wherein the first suppressor and the second suppressor are respectively arranged at an inlet and an outlet of the closed cavity and used for preventing microwaves from leaking out.

Preferably, a first hot asphalt spraying unit, a first regenerant spraying unit and a first flue gas recovery processing device are arranged on the front milling and heating machine body; the first hot asphalt spraying unit and the first regenerant spraying unit are respectively used for spraying hot asphalt and a regenerant onto the upper layer of the old asphalt pavement; the first flue gas recovery processing device is close to the front milling device and is used for recovering flue gas generated by the front milling heating machine in the milling process;

the rear milling and heating machine body is provided with a second hot asphalt spraying unit, a second regenerant spraying unit and a second flue gas recovery processing device; the second hot asphalt spraying unit and the second regenerant spraying unit are respectively used for spraying hot asphalt and a regenerant onto the middle layer of the old asphalt pavement; the second flue gas recovery processing device is close to the rear milling device and is used for recovering flue gas generated by the rear milling heating machine in the milling process.

Preferably, the hot air microwave composite in-situ heat regeneration unit further comprises a feeding machine; the feeding machine comprises a feeding machine body, a first hopper is arranged at the front part of the feeding machine body, a material conveying and lifting device is arranged at an outlet of the first hopper and used for conveying and lifting materials, a slewing bearing assembly is arranged at one end, far away from the first hopper, of the material conveying and lifting device, a slewing lifting device is hinged to the slewing bearing assembly, and the slewing lifting device is connected with a cab through a variable amplitude oil cylinder;

under the action of the slewing bearing assembly, the slewing lifting device rotates by 90 degrees left and right around the slewing center of the slewing bearing assembly;

under the action of the amplitude variation oil cylinder, the rotary material lifting device realizes amplitude variation adjustment of 0-35 degrees up and down relative to a connection point of the rotary material lifting device and the rotary support assembly.

Preferably, the hot air and microwave composite in-situ heat regeneration unit further comprises a remixer, a second hopper is arranged at the front of the remixer, a scraper conveying metering device is arranged at the bottom of the second hopper, a fourth inclined scraper lifting device is arranged at the tail end of the scraper conveying metering device, a first heat connection heating wall is arranged between two bridges at the lower part of the fourth inclined scraper lifting device, and a first stirrer is arranged above the tail end of the body of the remixer.

Preferably, the hot air microwave composite in-situ heat regenerator unit further comprises a re-mixing regenerator; the compound mixing regenerator comprises a compound mixing regenerator body, wherein a second stirrer is arranged at the front part of the compound mixing regenerator body, second thermal connection heating walls which are oppositely arranged are arranged on the left side and the right side of the second stirrer, a plurality of groups of microwave heating walls are arranged behind the second stirrer, a first cloth screw and a first ironing plate are sequentially arranged at the rear end of the compound mixing regenerator body, a second cloth screw and a second ironing plate are sequentially arranged behind the first ironing plate, a horizontal conveying device is arranged between a left supporting beam and a right supporting beam of the compound mixing regenerator body, the horizontal conveying device extends forwards and is connected with a transition hopper, a feed chute extends backwards and is connected with the transition hopper, and an automatic opening discharge door is arranged on a conveying bottom plate of the horizontal conveying device between the transition hopper and the second stirrer.

In a third aspect, the invention provides a material adding and re-mixing regeneration method for a hot air microwave composite in-situ heat regeneration unit, which comprises the following steps:

step S11, heating the old asphalt pavement by a hot air heater; the heating depth of the old asphalt pavement is a set first depth range value, the highest temperature of the surface layer of the old asphalt pavement is less than or equal to a set first temperature threshold, and the temperature at the first depth range value in the old asphalt pavement is greater than or equal to a set second temperature threshold;

step S12, spraying a regenerant and hot asphalt on the heated old asphalt pavement by using a front milling heater, then carrying out hot milling on the old asphalt pavement within a first depth range by using a front milling device to form a regenerated material pile, wherein the temperature of the regenerated material pile is greater than or equal to a third set temperature threshold value, lifting the regenerated material pile by a first inclined scraper lifting unit to a first horizontal scraper material conveying and heating unit, and carrying out backward conveying, heating and heat preservation to finish the heating and milling operation of a first layer of pavement; then, heating the old asphalt pavement below the first depth range continuously by adopting a heating element below the front milling and heating machine body;

step S13, a second inclined scraper lifting device in the rear milling heater is used for lifting materials to a second horizontal scraper material conveying and heating unit, and the reclaimed material pile formed by the first layer of pavement is conveyed backwards continuously and is heated and insulated; heating the old asphalt pavement below the first depth range continuously by adopting a heating element below the rear milling and heating machine body, controlling the highest temperature of the surface layer to be less than or equal to a set first temperature threshold, and controlling the temperature at a second depth range in the pavement to be greater than or equal to a set second temperature threshold; spraying a regenerant and hot asphalt on the second layer of pavement within the second depth range, carrying out hot milling on the old asphalt pavement within the second depth range by using a rear milling device to form a regenerated material pile, and simultaneously conveying the regenerated material formed on the first layer of pavement to the regenerated material pile by using a second horizontal scraper material conveying and heating unit to form a regenerated material pile mixture, wherein the comprehensive temperature of the regenerated material pile mixture is greater than or equal to a set third temperature threshold;

step S14, a third inclined scraper plate material lifting device in the microwave tunnel heater is used for lifting materials to a tunnel type horizontal material conveying device and conveying the materials backwards, a microwave heating unit is used for emitting microwaves to carry out secondary heating on the regenerated material pile mixture, and the comprehensive temperature of the heated regenerated material pile mixture is greater than or equal to a fourth temperature threshold value;

step S15, adding a new asphalt mixture to the reclaimed material pile mixture of the microwave tunnel heater by using a feeding machine, or adding a new asphalt mixture to a transition hopper of the remixing regenerator, and controlling the new asphalt mixture to enter the second stirrer through opening and closing of a discharge door of the remixing regenerator; the method comprises the steps that a re-mixing regenerator is used for fully and uniformly mixing a regenerated material pile mixture and a new asphalt mixture to form a mixed material pile, when the temperature of the mixed material pile is smaller than a set fifth temperature threshold value, a second microwave heating wall emits microwaves to heat the mixed material pile, the average temperature of the heated mixed material pile is smaller than or larger than the fifth temperature threshold value, second heat connecting heating walls which are oppositely arranged are arranged on the left side and the right side of a second stirrer to heat the hot bonding of the milled asphalt pavement, the heating temperature is larger than or equal to a sixth temperature threshold value, a first-level distribution spiral and a first-level leveling ironing plate are lifted during spreading, a second-level distribution spiral and a second-level basic spreading ironing plate are used for completing distribution and spreading prepressing, and finally, rolling compaction is carried out, so that the regenerated asphalt pavement is obtained;

or a dump truck is adopted to directly add new asphalt mixture to a second hopper of the remixer, metering and conveying of the new asphalt mixture to a reclaimed material pile are completed through a scraper material conveying metering device, reclaimed materials and the new asphalt mixture are continuously conveyed to an overhead first stirrer through a fourth inclined scraper material lifting unit, the materials are fully and uniformly mixed to form the material pile, a first thermal connection heating wall heats thermal bonding of the milled asphalt pavement, the temperature is not lower than a sixth temperature threshold, material distribution and paving are completed through an independent paver, and finally, compaction is performed through rolling to obtain the reclaimed asphalt pavement.

In a fourth aspect, the invention provides a material adding, re-mixing, and additional paving regeneration method for a hot air microwave composite in-situ heat regeneration unit, which is characterized by comprising the following steps: the method comprises the following steps:

a step S21, the step S21 being the same as step S11;

a step S22, the step S22 being the same as step S12;

a step S23, the step S23 being the same as step S13;

a step S24, the step S24 being the same as step S14;

step S25, the feeder machine is used for driving on the regeneration lane and the left and right lateral lanes to complete the addition of the new asphalt mixture in the regeneration material pile and the transition hopper in the remixing regeneration machine, wherein one part continuously and directly adds the new asphalt mixture to the regeneration material pile gathered after milling, the other part continuously and additionally adds the new asphalt mixture to the transition hopper in the remixing regeneration machine, and the horizontal conveying device controls the new asphalt mixture to be transported backwards;

step S26, a remixing regenerator is used for simultaneously completing remixing regeneration and surface paving, the remixing regeneration refers to a feeder for conveying a new asphalt mixture to a recycled material pile collected after milling, a second stirrer of the remixing regenerator is used for uniformly mixing the fresh asphalt mixture and the recycled material pile to form a mixed material pile, when the temperature of the mixed material pile is lower than a set fourth temperature threshold value, a microwave heating wall is used for emitting microwave for carrying out temperature compensation heating on the mixed material pile collected after remixing again, second heat connecting heating walls on two sides are used for carrying out heat bonding heating on a milled asphalt pavement, the mixed material pile is paved and pre-pressed by a first-level distributing screw and a first-level leveling ironing plate to form a remixing regeneration layer, the surface paving refers to a feeder for conveying the new asphalt mixture to a transition hopper, a horizontal conveying device is used for controlling the new asphalt mixture to be conveyed backwards and slide onto the remixing regeneration layer, and the mixed regeneration layer is paved by a second-level distributing screw and a second-level foundation paving plate, And (3) forming a hot-to-hot brand new asphalt thin wearing layer after paving and pre-pressing, and finally, rolling and compacting to obtain the regenerated asphalt pavement.

In a fifth aspect, the invention provides a method for simultaneously adding materials to an upper surface layer and a middle surface layer of a hot air microwave composite in-situ heat regeneration unit and performing re-mixing regeneration, which comprises the following steps: the adding material re-mixing transfer step of the upper layer and the adding material re-mixing regeneration and paving regeneration step of the middle layer;

the adding and re-mixing transfer step of the upper layer comprises the following steps:

a step S31, the step S31 being the same as step S11;

a step S32, the step S32 being the same as step S12;

a step S33, the step S33 being the same as step S13;

a step S34, the step S34 being the same as step S14;

step S35, a dump truck is adopted to directly add new asphalt mixture to a second hopper of the remixer, metering and conveying of the new asphalt mixture to a reclaimed material pile are completed through a scraper material conveying metering device, a fourth inclined scraper material lifting device continuously conveys reclaimed materials and the new asphalt mixture to an overhead first stirrer, the reclaimed materials directly fall into the hopper of the multifunctional feeding machine, and transfer of the reclaimed materials on the upper layer to the dump truck is completed through functions of rotation, amplitude variation, conveying and the like of the feeding machine;

the steps of the material adding and re-mixing regeneration of the middle surface layer and the paving regeneration of the upper surface layer comprise:

a step S36, the step S36 being the same as step S11;

a step S37, the step S37 being the same as step S12;

a step S38, the step S38 being the same as step S13;

a step S39, the step S39 being the same as step S14;

step S310, a remixing regenerator is used for simultaneously completing remixing regeneration of a middle surface layer and paving regeneration of an upper surface layer, remixing regeneration of the middle surface layer refers to that a feeder conveys a new asphalt mixture to a regeneration material pile gathered after milling, a second stirrer of the remixing regenerator finishes mixing the new asphalt mixture and the regeneration material pile uniformly to form a regeneration material pile of the middle surface layer, when the temperature of the regeneration material pile of the middle surface layer is lower than a set fourth threshold value, a microwave heating wall sends out microwaves to perform temperature compensation heating again on the regeneration material pile of the middle surface layer, second heat connection heating walls on two sides heat the hot bonding of the milled asphalt pavement, the regeneration material of the middle surface layer forms a brand new middle surface layer after being paved and pre-pressed by a first-level cloth screw and a first-level leveling ironing plate, the regeneration of the upper surface layer refers to that the feeder conveys the upper regeneration material to a transition hopper, then the horizontal conveying device conveys the material backwards to slide onto the middle surface layer, and the material is paved by a second-level cloth screw and a second-, And (3) forming a brand-new upper surface layer of 'heat to heat' after paving and pre-pressing, and finally, compacting by rolling to obtain the regenerated asphalt pavement.

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

1) the hot air heating machine adopts a novel modularized variable power hot air heating technology, the inlet and return air temperature of hot air is accurately controlled through modularization of a plurality of heating machines, the highest temperature of the surface layer of the asphalt pavement does not exceed 180 ℃, and the temperature of the position 20-30 mm in the pavement is not lower than 110 ℃, so that the problems of environmental pollution and road performance reduction caused by traditional fuel oil/gas open fire heating, fuel gas infrared heating or extensive high-power diesel hot air heating of easily scorched asphalt pavement are solved, and simultaneously, the heat leakage around the equipment is effectively reduced through waste heat recycling around a modularized heating wall, and the scorching of green belts and trees caused by construction of surrounding high-temperature hot smoke is avoided;

2) the front milling heater and the rear milling heater adopt a construction process of hot-air layered heating, layered hot milling, layered conveying and heating of an asphalt pavement, and solve the problems that an in-situ heat regeneration unit on the market at present adopts a construction process of one-time heating of the asphalt pavement, the temperature gradient between layers is large, the temperature of an asphalt material with the thickness of 10-20 mm on the upper part is too high (up to 240 ℃), the depth is mostly limited to 30-40 mm, deep diseases cannot be well treated, the temperature of the asphalt material on the bottom layer is only 70-80 ℃, the phenomenon of damage (white material generation) of aggregate grading in the asphalt material in the milling process is easily caused, the comprehensive temperature of the formed reclaimed material is only about 120 ℃, the direct paving temperature is low, the regeneration quality is influenced, semi-closed low-temperature construction is realized, the energy consumption is reduced, and the construction efficiency is improved; in addition, a flue gas recovery processing device is introduced in the high-temperature pavement heating and hot milling links, so that the emission of flue gas and dust is effectively inhibited, and the requirements of relevant national environmental protection laws and regulations are met.

3) The microwave tunnel heater adopts a tunnel type microwave heating technology, secondary temperature raising is carried out on the reclaimed materials subjected to layered milling by using 2.45GHz frequency microwaves, lossless, uniform and efficient heating of the asphalt materials is realized, the temperature of the asphalt materials in each link is ensured to reach the standard, the performance of the asphalt road is recovered, and the tunnel type microwave tunnel heater is smokeless and environment-friendly. The defects that the temperature of a local heat regeneration unit in the market is heated by infrared rays or hot air and is not easy to be accurately controlled, secondary aging of the regenerated material is easy to cause, and the regeneration quality is influenced are overcome;

4) the introduction of the combination of the dump truck and the multifunctional feeder can realize multi-degree-of-freedom and multi-directional feeding in any area within the range of amplitude variation of the feeding device, the feeding is accurate, the temperature drop loss of the asphalt material is small, and the problems of difficult feeding of the existing new material, large heat loss, frequent intermittent operation of a remixing regenerator in the feeding process, poor construction flatness and poor regeneration quality are solved;

5) the re-mixing regenerator adopts a 2.45GHz frequency microwave and modularized hot air heating mode, selective reheating and temperature raising of an asphalt material pile gathered after re-mixing and thermal bonding heating of a milled and milled asphalt pavement are respectively realized, the heating is smokeless and environment-friendly, the temperature of the asphalt material in each link is ensured to reach the standard, a double ironing plate and double leveling design is adopted, a brand-new material adding, re-mixing, paving and regenerating process can be realized, the simultaneous material adding, re-mixing and regenerating process of an upper surface layer and a middle surface layer can be considered, the real double-layer paving is realized, and the regenerating quality of the asphalt pavement is improved.

Drawings

FIG. 1 is a schematic diagram of the construction process of material-adding and re-mixing regeneration (material-adding of a regeneration lane) of the present invention;

FIG. 2 is a schematic diagram of the material-adding remixing construction process (lateral lane material-adding) of the present invention;

FIG. 3 is a schematic diagram of the construction process (independent paving) of the present invention;

FIG. 4 is a schematic view of the material-adding mix-up and spread-over regeneration construction process (simultaneous material-adding of the regeneration lane and the lateral lane) of the present invention;

FIG. 5 is a schematic view of the construction process of adding materials and re-mixing regeneration for the upper surface layer and the middle surface layer at the same time;

FIG. 6 is a structural arrangement diagram of a hot air heater;

fig. 7 is a structural layout diagram of a front milling and heating machine;

fig. 8 is a structural layout diagram of a rear milling heater;

FIG. 9 is a structural arrangement diagram of a microwave tunnel heater;

FIG. 10 is a structural layout diagram of the feeding combination of the dump truck and the multifunctional feeder;

FIG. 11 is a schematic view of the variable amplitude operation of the multi-function feeder;

FIG. 12 is a schematic view of a rotary operation of the multi-function feeder;

FIG. 13 is a structural layout of a remixer;

FIG. 14 is a structural layout diagram of a remixing regenerator.

In the figure:

1. the system comprises a hot air heater, a first hot air heating wall, a first heating wall lifting frame, a second heating wall lifting frame, a first milling heating machine, a second milling heating wall, a first milling device, a second milling device, a first inclined scraper lifting device, a second inclined scraper lifting device, a third inclined scraper lifting device, a fourth inclined scraper lifting device, a fifth lifting device, a fourth inclined scraper, a fifth lifting device, a sixth lifting device, a.

Detailed Description

In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention is further described in detail with reference to the following embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.

The following detailed description of the principles of the invention is provided in connection with the accompanying drawings.

Example 1

An embodiment of the present invention provides a layered hot milling apparatus, including: a hot air heater 1, a front milling heater 2 and a rear milling heater 3 are sequentially arranged;

in order to overcome the problems that the traditional fuel oil/gas open fire heating, fuel gas infrared heating or extensive high-power diesel hot air heating easily scorches an asphalt pavement to cause environmental pollution and road performance reduction, and effectively avoid the difficult problem that the surrounding high-temperature hot flue gas easily causes green belts and trees to be scorched during construction, the embodiment adopts a novel modularized variable-power hot air heating technology, the hot air inlet and return temperature is accurately controlled through modularization of a plurality of heating machines, the highest temperature of the surface layer of the asphalt pavement is not more than 180 ℃, the temperature of the 20-30 mm part in the pavement is not less than 110 ℃, the heating process is smokeless, environment-friendly and high in thermal efficiency, and meanwhile, the heat leakage around the equipment is effectively reduced through the waste heat recycling around the modularized heating wall. The specific structure of the hot air heater in the present embodiment is described in detail below.

As shown in fig. 1 to 6, a hot air heater 1 in the embodiment of the present invention is located at the foremost end of an in-situ heat regeneration device, and is used for heating an old asphalt pavement, and includes a hot air heater body and at least 3 groups of first hot air heating walls 1-1, wherein each first hot air heating wall 1-1 is located in front of, in the middle of, and behind the hot air heater body, and is connected to the hot air heater body through 2 groups of front and rear heating wall lifting frames 1-2 and 1 group of middle heating wall lifting frames 1-3. The specific number of the hot air heaters 1 is not limited in the invention, and the hot air heaters 1 can adopt CN108086123A named as the modular subarea hot air circulation type asphalt pavement heater mentioned in the modular subarea hot air circulation type asphalt pavement heater; the first hot air heating wall adopts a heating wall structure which is disclosed as CN108487020A and is named as a hot air circulation heating device in the Chinese invention patent application; the front and rear heating wall overturning and lifting frame adopts a heating wall operation executing mechanism which is disclosed as CN108560389A and is named as a heating wall operation executing mechanism and the asphalt pavement heater thereof.

In order to solve the problems that the in-situ heat regeneration equipment on the market heats the asphalt pavement at one time, the interlayer temperature gradient is large, the temperature of the asphalt material with the thickness of 10-20 mm at the upper part is too high (up to 240 ℃), the depth is limited to 30-40 mm, deep diseases cannot be well treated, the temperature of the asphalt material at the bottom layer is only 70-80 ℃, the phenomenon of damage (white material generation) of aggregate grading in the asphalt material in the milling process is easily caused, the comprehensive temperature of the formed reclaimed material is only about 120 ℃, the direct paving temperature is low, and the regeneration quality is influenced, the front milling heater and the rear milling heater adopt the construction process of in-situ hot air layered heating, layered hot milling, layered conveying and heating of the asphalt pavement, semi-closed low-temperature construction is realized, the energy consumption is reduced, and the construction efficiency is improved; in addition, a flue gas recovery processing device is introduced in the high-temperature pavement heating and hot milling links, so that the emission of flue gas and dust is effectively inhibited, and the requirements of relevant national environmental protection laws and regulations are met. The specific structure thereof is described in detail as follows.

As shown in fig. 7, the front milling and heating machine 2 includes a front milling and heating machine body, and a front milling device 2-1 is provided under the front of the front milling and heating machine body for hot milling the old asphalt pavement, which is a prior art device; a first inclined scraper lifting device 2-2 and a first horizontal scraper material conveying and heating device 2-3 are sequentially arranged at the rear part of the front milling device 2-1, at least 2 groups of second hot air heating walls 2-4 are arranged between two bridges below the first horizontal scraper material conveying and heating device 2-3, a first hot asphalt box 2-5 and a first regenerant box 2-6 which are symmetrically arranged at the left and right are arranged at the front end of the upper part of the front milling and heating machine body, and a first flue gas recovery and treatment device 2-7 is arranged in the middle of the upper part of the front milling and heating machine body; the second hot air heating wall adopts a heating wall structure which is disclosed in the Chinese invention patent application with the publication number of CN108487020A and is named as a hot air circulation heating device.

As shown in fig. 8, the rear milling heater 3 includes a rear milling heater body, a milling device 3-1 is provided below the rear portion of the rear milling heater body, a second inclined scraper material lifting device 3-2 is provided below the foremost portion of the rear milling heater body, a second horizontal scraper material conveying and heating device 3-3 is arranged at the rear part of the second inclined scraper material lifting device 3-2, at least 2 groups of third hot air heating walls 3-4 are arranged between the front axle and the rear axle below the second horizontal scraper material conveying and heating device 3-3, a second flue gas recovery processing device 3-5 is arranged at the tail end of the upper part of the rear milling and heating machine body, which is positioned at the rear part of the third hot air heating wall 3-4, the front part of the second flue gas recovery processing device 3-5 is provided with a second hot asphalt box 3-6 and a second regenerant box 3-7 which are arranged in bilateral symmetry; the third hot air heating wall adopts a heating wall structure which is disclosed as CN108487020A and is named as a hot air circulation heating device in the Chinese invention patent application.

Example 2

Based on the same inventive concept as embodiment 1, the embodiment of the invention provides a hot air and microwave composite in-situ heat regeneration unit, which not only can realize layered hot milling, but also can overcome the defects that the in-situ heat regeneration unit in the market is not suitable for accurately controlling the infrared heating or hot air heating temperature, secondary aging of the reclaimed materials is easy to cause, the regeneration quality is influenced and the like, a tunnel type microwave heating technology is adopted for a microwave tunnel heater, and 2.45GHz frequency microwaves are used for carrying out secondary temperature raising on the reclaimed materials subjected to layered milling, so that the asphalt pavement is heated uniformly and efficiently without damage, the temperature of the asphalt materials in each link reaches the standard, the performance of the asphalt pavement is recovered, and the unit is smokeless and environment-friendly.

The hot air microwave composite in-situ heat regeneration unit comprises:

the layered hot milling apparatus described in example 1;

microwave tunnel heater, microwave tunnel heater locates rearmounted milling heater rear among the hot milling equipment of layering for heat the material of the equipment output of milling equipment of layering, as shown in fig. 9, microwave tunnel heater 4 includes:

the microwave tunnel heater comprises a microwave tunnel heater body, wherein a third inclined scraper lifting device 4-1 is arranged below the foremost part of the microwave tunnel heater body, and the third inclined scraper lifting device 4-1 is arranged below the foremost part of the microwave tunnel heater body and used for realizing lifting; a tunnel type horizontal material conveying device 4-2 is arranged behind the third inclined scraper material lifting device 4-1, the tunnel type horizontal material conveying device 4-2 comprises a closed cavity, a material distributor 4-3, a plurality of groups of microwave heating units 4-5 and material conveying assemblies, the top of the closed cavity is provided with an inlet, and the bottom of the closed cavity is provided with an outlet; the distributing device 4-3 is arranged at an inlet at the top of the closed cavity, is positioned above the inlet of the material conveying assembly and is used for uniformly distributing materials from left to right; the microwave heating units 4-5 are arranged at the top of the closed cavity and are positioned above the material conveying assembly; the outlet end of the material conveying component is positioned above the outlet at the bottom of the closed cavity.

The microwave tunnel heater is characterized in that a distributor 4-3, a suppressor I4-4, a plurality of groups of microwave heating units 4-5 and a suppressor II 4-6 are sequentially arranged above the microwave tunnel heater from front to back, a plurality of groups of microwave variable frequency power supplies 4-7 and a plurality of groups of microwave heat dissipation devices 4-8 are arranged on the left side and the right side above the microwave tunnel heater body, and a plurality of groups of heat insulation boards 4-9 are further arranged below the microwave tunnel heater body.

Further, in order to prevent the microwave from leaking out, namely, the microwave heating unit is in short load, the tunnel type horizontal material conveying device further comprises a first suppressor 4-4 and a second suppressor 4-6, wherein the first suppressor 4-4 and the second suppressor 4-6 are respectively arranged at the inlet and the outlet of the closed cavity. The first suppressor 4-4 and the second suppressor 4-6 can be reactive energy leakage suppressors, and mineral powder, cement, sand, aluminum profiles and the like are filled in the suppressors and used for absorbing microwave energy leaked from two ends of the inlet and the outlet and limiting the microwave energy generated by the microwave heating unit in the tunnel type closed cavity. The microwave heating unit comprises a magnetron and a waveguide antenna, wherein the magnetron is used for transmitting microwave energy with the frequency of 2.45GHz, the waveguide antenna is used for transmitting the microwave energy, and the structure of the microblog heating unit is the prior art.

Furthermore, in order to solve the problems that the addition of the existing new asphalt mixture needs to stride over a material pile with the thickness of 200-300 mm after milling and a potential safety hazard exists, in addition, a pavement heater and a heating milling machine need to move forward for 20-30 m during material addition, and the milled material heat loss is large due to large span, and the problems that the re-mixing regenerator is frequently stopped when the pavement heater and the heating milling machine are ridden on the material pile and fed to the hopper of the re-mixing regenerator, the paving flatness is affected, and the regeneration quality is not easy to control are solved, the invention also provides a material adding combination 5 of the dump truck and the multifunctional material feeder, which comprises a feeder 5-1 and a dump truck 5-2; the multi-freedom-degree and multi-direction feeding in any area in the range of amplitude variation of the material conveying device can be realized, the feeding is accurate, the temperature drop loss of the asphalt material is small, and the re-mixing regenerator can continuously and efficiently operate. The specific structure is described in detail below.

As shown in fig. 10 to 12, the feeding machine 5 is located right ahead of the remixing regenerator 7 or obliquely ahead of the adjacent left and right lanes, and includes a feeding machine body 5-1, the front portion of the feeding machine body 5-1 is provided with a first hopper 5-1-1, a material conveying and lifting device 5-1-2 is located at the bottom of the first hopper 5-1-1 for realizing material conveying and lifting, a rotary support assembly 5-1-3 is fixed at the tail end of the material conveying and lifting device 5-1-2, the rotary lifting device 5-1-4 is hinged with the rotary support assembly 5-1-3 and is connected with the cab 5-1-5 through a variable amplitude cylinder 5-1-6, and under the action of the rotary support assembly 5-1-3, the rotary lifting device 5-1-4 is hinged with the rotary center of the rotary support assembly 5-1-3 to be solid At present, the left and right rotation is carried out by 90 degrees, and under the action of the amplitude variation oil cylinder 5-1-6, the amplitude variation adjustment of 0-35 degrees up and down is realized by the rotary material lifting device 5-1-4 relative to the connection point of the rotary material lifting device and the rotary support assembly 5-1-3.

In order to improve the construction process adaptability of the in-situ heat regeneration unit and overcome the problems that the unit in the market can only realize the material adding remixing regeneration process and the remixing and paving process, can not realize the simultaneous in-situ heat regeneration of an upper surface layer and a middle surface layer, a certain proportion of new asphalt mixture is not added in the remixing process of the remixing and paving process, a proper amount of regenerant is added for remixing and paving to form a regeneration layer, then a certain thickness of brand-new asphalt mixture is paved on the regeneration layer, the true double-layer paving is not realized, and the construction quality is poor, the embodiment of the invention provides a 2.45GHz frequency microwave and modular hot air heating mode, which respectively realizes the selective reheating temperature raising of the asphalt material pile gathered after remixing and the hot bonding heating of the milled asphalt pavement, the heating is environment-friendly, the temperature of the asphalt material in each link is ensured to reach the standard, and a double ironing plate is adopted, The double-leveling design can realize a brand-new material adding, re-mixing and paving regeneration process, and also consider the material adding, re-mixing and regeneration process of the upper surface layer and the middle surface layer at the same time, thereby realizing the real double-layer paving and improving the regeneration quality of the asphalt pavement. Therefore, in the embodiment of the present invention, the hot air microwave composite hot in-place recycling unit further includes a remixer 6 or a remixer 7, and specific structures of the remixer 6 and the remixer 7 are described in detail below.

As shown in figure 13, the foremost part of the remixer 6 is provided with a second hopper 6-1, the bottom of the second hopper 6-1 is provided with a scraper conveying metering device 6-2, the tail end of the scraper conveying metering device 6-2 is provided with a fourth inclined scraper lifting device 6-3, a first heat connecting heating wall 6-4 is arranged between a front bridge and a rear bridge at the lower part of the fourth inclined scraper lifting device 6-3, and the tail end above the body of the remixer is provided with a first stirrer 6-5.

As shown in fig. 14, a second stirrer 7-1 is arranged at the forefront below the remixing regenerator 7, second heat-connecting heating walls 7-2 are arranged at the left and right sides of the second stirrer 7-1, a plurality of groups of microwave heating walls 7-3 are arranged between two back tracks of the second stirrer 7-1, a first-stage distribution screw 7-4 and a first-stage leveling ironing plate 7-5 are arranged at the back end below the remixing regenerator, a second-stage distribution screw 7-6 and a second-stage basic paving ironing plate 7-7 are arranged behind the first-stage leveling ironing plate 7-5, a horizontal conveying device 7-8 is arranged at the forefront end between a left supporting beam and a right supporting beam of the regenerator, the horizontal conveying device 7-8 is connected with a transition hopper 7-9 in a forward extending manner, a material guiding groove 7-10 is connected in a backward extending manner, and a conveying device 7-8 of the horizontal conveying device 7-9 is arranged between the transition hopper 7-9 and the second stirrer 7 The material bottom plate is provided with an automatically opened discharge door 7-11; first embodiment described in the present embodiment

In summary, the following steps: when the hot air microwave composite in-situ heat regeneration complete set unit adopting layered construction provided by the embodiment of the invention is used for construction, three processes including a material adding and re-mixing regeneration process, a material adding and re-mixing and paving regeneration process and a material adding and re-mixing regeneration process for an upper surface layer and a middle surface layer at the same time can be carried out.

Example 3

Based on the same inventive concept as that of the embodiment 2, the embodiment of the invention provides a material adding and re-mixing regeneration method, which is shown in fig. 1 to 3, and the material adding and re-mixing regeneration process comprises the following steps:

step S11, heating the old asphalt pavement by using a plurality of hot air heaters 1, wherein the heating depth of the old asphalt pavement is 20-30 mm, the highest temperature of the surface layer of the old asphalt pavement is not more than 180 ℃, and the temperature of the 20-30 mm position in the pavement is not lower than 110 ℃;

step S12, a recycling agent and hot asphalt are accurately sprayed on the road surface before hot milling by using the front milling heater 2, then the front milling device 2-1 carries out hot milling on the old asphalt road surface by 20-30 mm, the first flue gas recovery processing device 2-7 is introduced in the milling process to carry out flue gas recovery processing, a trapezoidal ridge-shaped recycled material pile is formed after milling, the temperature of the material pile is not lower than 140 ℃, the material is lifted to the first horizontal scraper material conveying and heating device 2-3 by the first inclined scraper material lifting device 2-2 and then is conveyed backwards and heated and insulated, and therefore the heating milling operation of the first layer of road surface by 20-30 mm is completed; then, a second hot air heating wall 2-4 below the machine body is adopted to continuously heat the asphalt pavement with the thickness of 20 mm-30 mm below;

step S13, a material is lifted to a second horizontal scraper material conveying and heating device 3-3 by a front second inclined scraper material lifting device 3-2 of a rear milling and heating machine 3, and the reclaimed materials formed on the first layer of 20-30 mm pavement are conveyed backwards, heated and insulated; continuously heating the asphalt pavement with the thickness of below 20-30 mm by using a third hot air heating wall 3-4 below the machine body, wherein the highest temperature of the surface layer is controlled not to exceed 180 ℃, and the temperature of the position with the thickness of 40-60 mm in the pavement is controlled not to be lower than 110 ℃; accurately spraying a regenerant and hot asphalt on the pavement before the hot milling of the second layer, carrying out hot milling on the old asphalt pavement by a rear milling device 3-1, introducing a second flue gas recovery processing device 3-5 in the milling process to carry out flue gas recovery processing, forming a trapezoidal ridge-shaped regenerated material pile after milling, and simultaneously conveying the regenerated material formed on the pavement of the first layer of 20-30 mm to the regenerated material pile by a second horizontal scraper material conveying and heating device 3-3 to form the regenerated material pile with the comprehensive temperature of not lower than 140 ℃;

step S14, a third inclined scraper blade material lifting device 4-1 arranged in front of a microwave tunnel heater 4 is used for lifting materials to a tunnel type horizontal material conveying device 4-2 for conveying backwards, a microwave heating unit 4-5 is used for emitting 2.45GHz microwaves to carry out secondary heating on the reclaimed materials, the temperature is raised to 10-15 ℃, and the comprehensive temperature of the reclaimed material pile after heating is not lower than 150 ℃;

step S15, a set of dump truck and multifunctional feeder material adding combination 5 is used for driving on a regeneration lane or a left and right lateral lane, new asphalt mixture is continuously and directly added to a milled regeneration material pile, or new asphalt mixture is continuously added to a transition hopper 7-9 of a remixing regenerator 7, and the new asphalt mixture is accurately controlled to enter a second stirrer 7-1 through opening and closing of a discharge door 7-11;

step S16, the re-mixing and regenerating machine 7 is used to complete the full and even mixing of the regenerated material and the new asphalt mixture and form a trapezoidal ridge-shaped mixing material pile, the temperature of the formed material pile is generally not lower than 150 ℃, the microwave heating wall 7-3 can selectively emit 2.45GHz microwave to re-supplement the temperature of the mixed material pile gathered after re-mixing, the average temperature of the mixed material pile after heating is not lower than 160 ℃, the second heat connecting and heating walls 7-2 on the two sides heat and heat the hot bonding of the milled asphalt pavement, the temperature is not lower than 120 ℃ (namely the original pavement formed after twice milling needs to be heated to 120 ℃ before the paving, the bonding strength between the regenerated material and the original pavement can be increased during the paving), the first-level distributing screw 7-4 and the first-level leveling plate 7-5 are lifted during the paving, and the distributing ironing is completed by the second-level distributing screw 7-6 and the second-level basic paving ironing plate 7-7, Paving and prepressing, and finally, rolling and compacting to obtain a regenerated asphalt pavement;

replacing the steps S15 and S16, a dump truck can also be adopted to directly add a new asphalt mixture into a second hopper 6-1 of the remixer 6, the metering and conveying of the new asphalt mixture to a reclaimed material pile are completed through a scraper material conveying metering device 6-2, the reclaimed material and the new asphalt mixture are continuously conveyed to a first overhead stirrer 6-5 through a fourth inclined scraper material lifting device 6-3, the materials are fully and uniformly mixed to form the material pile, the temperature of the material pile is not lower than 150 ℃, a first thermal connection heating wall 6-4 heats thermal bonding of the milled asphalt pavement, the temperature is not lower than 120 ℃, an independent paver 8 is adopted to complete material distribution and paving, and finally, the recycled asphalt pavement is obtained through compaction through rolling.

Example 4

The embodiment of the invention provides a material adding, re-stirring and spreading regeneration process, which comprises the following steps of:

step S21, heating the old asphalt pavement by using a plurality of hot air heaters 1, wherein the heating depth of the asphalt pavement is 20-30 mm, the highest temperature of the surface layer of the old asphalt pavement is not more than 180 ℃, and the temperature of the 20-30 mm position in the pavement is not lower than 110 ℃;

step S22, a recycling agent and hot asphalt are accurately sprayed on the road surface before hot milling by using the front milling heater 2, then the front milling device 2-1 carries out hot milling on the old asphalt road surface by 20-30 mm, the first flue gas recovery processing device 2-7 is introduced in the milling process to carry out flue gas recovery processing, a trapezoidal ridge-shaped recycled material pile is formed after milling, the temperature of the material pile is not lower than 140 ℃, the material is lifted to the first horizontal scraper material conveying and heating device 2-3 by the first inclined scraper material lifting device 2-2 and then is conveyed backwards and heated and insulated, and therefore the heating milling operation of the first layer of road surface by 20-30 mm is completed; then, a second hot air heating wall 2-4 below the machine body is adopted to continuously heat the asphalt pavement with the thickness of 20 mm-30 mm below;

step S23, a material is lifted to a second horizontal scraper material conveying and heating device 3-3 by a front second inclined scraper material lifting device 3-2 of a rear milling and heating machine 3, and the reclaimed materials formed on the first layer of 20-30 mm pavement are conveyed backwards, heated and insulated; continuously heating the asphalt pavement with the thickness of below 20-30 mm by using a third hot air heating wall 3-4 below the machine body, wherein the highest temperature of the surface layer is controlled not to exceed 180 ℃, and the temperature of the position with the thickness of 40-60 mm in the pavement is controlled not to be lower than 110 ℃; accurately spraying a regenerant and hot asphalt on the pavement before the hot milling of the second layer, carrying out hot milling on the old asphalt pavement by a rear milling device 3-1, introducing a second flue gas recovery processing device 3-5 in the milling process to carry out flue gas recovery processing, forming a trapezoidal ridge-shaped regenerated material pile after milling, and simultaneously conveying the regenerated material formed on the pavement of the first layer of 20-30 mm to the regenerated material pile by a second horizontal scraper material conveying and heating device 3-3 to form the regenerated material pile with the comprehensive temperature of not lower than 140 ℃;

step S24, a third inclined scraper blade material lifting device 4-1 arranged in front of a microwave tunnel heater 4 is used for lifting materials to a tunnel type horizontal material conveying device 4-2 for conveying backwards, a microwave heating unit 4-5 is used for emitting 2.45GHz microwaves to carry out secondary heating on the reclaimed materials, the temperature is raised to 10-15 ℃, and the comprehensive temperature of the reclaimed material pile after heating is not lower than 150 ℃;

step S25, a plurality of sets of dump trucks and multifunctional feeder material adding assemblies 5 are driven to a regeneration lane and a left lateral lane and a right lateral lane to complete the addition of new asphalt mixtures at two positions, wherein one position continuously adds new asphalt mixtures to a milled regeneration material pile directly, the other position continuously adds new asphalt mixtures to transition hoppers 7-9 of a remixing regenerator 7, and then the horizontal material conveying devices 7-8 in the feeders accurately control the backward transportation of the new asphalt mixtures; namely: as shown in fig. 4, the re-mixing and paving process adopts two sets of feeding combinations, wherein a lateral lane feeder directly adds a certain proportion of fresh materials to a regenerated material pile formed on the original pavement, the regenerated lane feeder adds the fresh materials to a hopper, and the fresh materials are conveyed backwards to a second ironing plate through a horizontal conveying device at the bottom of the hopper for paving, the two types of the fresh materials have different gradations, the former is a new material with larger particles for re-mixing, and the latter is a new material with fine particles of a surface wearing layer;

step S26, a remixing regenerator 7 is used for simultaneously completing remixing regeneration and surface paving, the remixing regeneration refers to a dump truck and a multifunctional feeder material adding combination 5 for conveying a new asphalt mixture to a recycled material pile gathered after milling, a second stirrer 7-1 of the remixing regenerator 7 completes the even mixing of the two materials and forms a trapezoidal ridge-shaped mixed material pile, the temperature of the formed material pile is generally not lower than 150 ℃, 2.45GHz microwave emitted by a microwave heating wall 7-3 can be selectively used for carrying out temperature supplementing heating again on the mixed material pile gathered after remixing, the average temperature of the mixed material pile after heating is not lower than 160 ℃, second heat connecting heating walls 7-2 at two sides are used for carrying out thermal bonding heating on the milled asphalt pavement, the temperature is not lower than 120 ℃, the mixed material pile is paved and pre-pressed by a first-level distributing screw 7-4 and a first-level leveling plate 7-5 to form a remixing regeneration layer, the surface additional paving refers to that the dump truck and the multifunctional feeder material adding combination 5 convey a new asphalt mixture to the transition hopper 7-9, then the horizontal conveying device 7-8 accurately controls the new asphalt mixture to be conveyed backwards and slide onto the re-mixing regeneration layer, a hot-to-hot brand new asphalt thin wearing layer is formed after the second-stage material distributing spiral 7-6 and the second-stage basic paving ironing plate 7-7 are subjected to material distributing and paving pre-pressing, and finally the regenerated asphalt pavement is obtained through rolling compaction.

Example 5

The embodiment of the invention provides a process for simultaneously adding and remixing an upper surface layer and a middle surface layer for regeneration, which comprises the steps of adding and remixing transfer of the upper surface layer, adding and remixing regeneration of the middle surface layer and paving regeneration of the upper surface layer, and is shown in figure 5 as follows:

the adding and re-stirring transfer step of the upper layer:

step S31, heating the old asphalt pavement by using a plurality of hot air heaters 1, wherein the heating depth of the asphalt pavement is 20-30 mm, the highest temperature of the surface layer of the old asphalt pavement is not more than 180 ℃, and the temperature of the 20-30 mm position in the pavement is not lower than 110 ℃;

step S32, a recycling agent and hot asphalt are accurately sprayed on the road surface before hot milling by using the front milling heater 2, then the front milling device 2-1 carries out hot milling on the old asphalt road surface by 20-30 mm, the first flue gas recovery processing device 2-7 is introduced in the milling process to carry out flue gas recovery processing, a trapezoidal ridge-shaped recycled material pile is formed after milling, the temperature of the material pile is not lower than 140 ℃, the material is lifted to the first horizontal scraper material conveying and heating device 2-3 by the first inclined scraper material lifting device 2-2 and then is conveyed backwards and heated and insulated, and therefore the heating milling operation of the first layer of road surface by 20-30 mm is completed; then, a second hot air heating wall 2-4 below the machine body is adopted to continuously heat the asphalt pavement with the thickness of 20 mm-30 mm below;

step S33, a material is lifted to a second horizontal scraper material conveying and heating device 3-3 by a front second inclined scraper material lifting device 3-2 of a rear milling and heating machine 3, and the reclaimed materials formed on the first layer of 20-30 mm pavement are conveyed backwards, heated and insulated; continuously heating the asphalt pavement with the thickness of below 20-30 mm by using a third hot air heating wall 3-4 below the machine body, wherein the highest temperature of the surface layer is controlled not to exceed 180 ℃, and the temperature of the position with the thickness of 40-60 mm in the pavement is controlled not to be lower than 110 ℃; accurately spraying a regenerant and hot asphalt on the pavement before the hot milling of the second layer, carrying out hot milling on the old asphalt pavement by a rear milling device 3-1, introducing a second flue gas recovery processing device 3-5 in the milling process to carry out flue gas recovery processing, forming a trapezoidal ridge-shaped regenerated material pile after milling, and simultaneously conveying the regenerated material formed on the pavement of the first layer of 20-30 mm to the regenerated material pile by a second horizontal scraper material conveying and heating device 3-3 to form the regenerated material pile with the comprehensive temperature of not lower than 140 ℃;

step S34, a third inclined scraper blade material lifting device 4-1 arranged in front of a microwave tunnel heater 4 is used for lifting materials to a tunnel type horizontal material conveying device 4-2 for conveying backwards, a microwave heating unit 4-5 is used for emitting 2.45GHz microwaves to carry out secondary heating on the reclaimed materials, the temperature is raised to 10-15 ℃, and the comprehensive temperature of the reclaimed material pile after heating is not lower than 150 ℃;

step S35, a dump truck is adopted to directly add new asphalt mixture to a hopper II 6-1 of a remixer 6, metering and conveying of the new asphalt mixture to a reclaimed material pile are completed through a scraper material conveying metering device 6-2, the reclaimed material and the new asphalt mixture are continuously conveyed to an overhead first stirrer 6-5 through a fourth inclined scraper material lifting device 6-3, the materials are fully and uniformly mixed to form the material pile with the temperature not lower than 150 ℃, the reclaimed material directly falls into the hopper of a multifunctional feeding machine 5-1, and the transfer of the reclaimed material on the upper layer to the dump truck is completed through the functions of rotation, amplitude variation, conveying and the like of the multifunctional feeding machine 5-1;

the method comprises the following steps of material adding, re-mixing and regeneration of the middle layer and paving and regeneration of the upper layer:

step S36, heating the old asphalt pavement by using a plurality of hot air heaters 1, wherein the heating depth of the asphalt pavement is 20-30 mm, the highest temperature of the surface layer of the old asphalt pavement is not more than 180 ℃, and the temperature of the 20-30 mm position in the pavement is not lower than 110 ℃;

step S37, a recycling agent and hot asphalt are accurately sprayed on the road surface before hot milling by using the front milling heater 2, then the front milling device 2-1 carries out hot milling on the old asphalt road surface by 20-30 mm, the first flue gas recovery processing device 2-7 is introduced in the milling process to carry out flue gas recovery processing, a trapezoidal ridge-shaped recycled material pile is formed after milling, the temperature of the material pile is not lower than 140 ℃, the material is lifted to the first horizontal scraper material conveying and heating device 2-3 by the first inclined scraper material lifting device 2-2 and then is conveyed backwards and heated and insulated, and therefore the heating milling operation of the first layer of road surface by 20-30 mm is completed; then, a second hot air heating wall 2-4 below the machine body is adopted to continuously heat the asphalt pavement with the thickness of 20 mm-30 mm below;

step S38, a material is lifted to a second horizontal scraper material conveying and heating device 3-3 by a front second inclined scraper material lifting device 3-2 of a rear milling and heating machine 3, and the reclaimed materials formed on the first layer of 20-30 mm pavement are conveyed backwards, heated and insulated; continuously heating the asphalt pavement with the thickness of below 20-30 mm by using a third hot air heating wall 3-4 below the machine body, wherein the highest temperature of the surface layer is controlled not to exceed 180 ℃, and the temperature of the position with the thickness of 40-60 mm in the pavement is controlled not to be lower than 110 ℃; accurately spraying a regenerant and hot asphalt on the pavement before the hot milling of the second layer, carrying out hot milling on the old asphalt pavement by a rear milling device 3-1, introducing a second flue gas recovery processing device 3-5 in the milling process to carry out flue gas recovery processing, forming a trapezoidal ridge-shaped regenerated material pile after milling, and simultaneously conveying the regenerated material formed on the pavement of the first layer of 20-30 mm to the regenerated material pile by a second horizontal scraper material conveying and heating device 3-3 to form the regenerated material pile with the comprehensive temperature of not lower than 140 ℃;

step S39, a third inclined scraper blade material lifting device 4-1 arranged in front of a microwave tunnel heater 4 is used for lifting materials to a tunnel type horizontal material conveying device 4-2 for conveying backwards, a microwave heating unit 4-5 is used for emitting 2.45GHz microwaves to carry out secondary heating on the reclaimed materials, the temperature is raised to 10-15 ℃, and the comprehensive temperature of the reclaimed material pile after heating is not lower than 150 ℃;

step S310, a remixing regenerator 7 is used for simultaneously completing remixing regeneration of a middle surface layer and paving regeneration of an upper surface layer, the remixing regeneration of the middle surface layer refers to that a dump truck and a multifunctional feeder material adding combination 5 convey a new asphalt mixture to a recycled material pile gathered after milling, the remixing regenerator 7 and a second stirrer 7-1 finish the uniform mixing of the two materials and form a middle surface layer recycled material pile, the temperature of the middle surface layer recycled material pile is generally not lower than 150 ℃, 2.45GHz microwave emitted by a microwave heating wall 7-3 can be selectively used for carrying out temperature supplementing heating again on the middle surface layer recycled material pile, the average temperature of the heated mixed material pile is not lower than 160 ℃, second thermal connection heating walls 7-2 on two sides are used for carrying out thermal bonding heating on the milled asphalt pavement, the temperature is not lower than 120 ℃, the recycled material of the middle surface layer is paved by a first-level cloth screw 7-4 and a first-level ironing plate 7-5 to form a, the upper layer spreading regeneration is that the dump truck and multifunctional feeder material adding combination 5 conveys the upper layer regenerated material to a transition hopper 7-9, then the upper layer regenerated material is conveyed backwards by a horizontal conveying device 7-8 and slides onto the middle layer, a brand new upper layer which is hot to hot is formed after the second-stage material distributing screw 7-6 and the second-stage basic spreading ironing plate 7-7 distribute, spreading prepressing, and finally the regenerated asphalt pavement is obtained through rolling compaction.

According to the hot air and microwave composite in-situ heat regeneration complete set unit adopting layered construction and the construction method thereof, the processes of in-situ hot air layered heating, layered heat milling and layered conveying heating of the asphalt pavement are adopted, semi-closed low-temperature construction is realized, the energy consumption is reduced, and the construction efficiency is improved; the novel modular hot air variable power heating and 2.45GHz frequency microwave composite heating technology is adopted, so that the nondestructive, uniform and efficient heating of the asphalt pavement is realized, the performance of the asphalt pavement is recovered, the technology is smokeless and environment-friendly, the heating depth is moderate, the interlayer temperature gradient is small, the hot milling and planing are in stepless matching damage, the temperature of the asphalt material in each link reaches the standard, and the construction quality is high; the addition of new materials adopts a combined mode of a dump truck and a multifunctional feeding machine, so that multi-degree-of-freedom and multi-direction feeding is realized, feeding is accurate and continuous, and the temperature of the asphalt materials is reduced; the unique re-mixing regenerator adopts a double-ironing plate and double-leveling design, can realize a brand-new material adding, re-mixing and paving regeneration process, considers the simultaneous material adding, re-mixing and regeneration process of the upper surface layer and the middle surface layer, realizes the real double-layer paving, and improves the regeneration quality of the asphalt pavement.

The foregoing shows and describes the general principles and broad features of the present invention and advantages thereof. It will be understood by those skilled in the art that the present invention is not limited to the embodiments described above, which are described in the specification and illustrated only to illustrate the principle of the present invention, but that various changes and modifications may be made therein without departing from the spirit and scope of the present invention, which fall within the scope of the invention as claimed. The scope of the invention is defined by the appended claims and equivalents thereof.

Claims

1. A layered hot milling apparatus, comprising: sequentially arranging a hot air heater, a front milling heater and a rear milling heater;

the hot air heater is used for heating the old asphalt pavement;

2. The utility model provides a hot-blast microwave complex hot in-place recycling unit which characterized in that includes:

the layered hot milling apparatus of claim 1;

a microwave tunnel heater body;

3. The hot air microwave composite in-situ heat regeneration unit according to claim 2, characterized in that: the tunnel type horizontal material conveying unit further comprises a first suppressor and a second suppressor, wherein the first suppressor and the second suppressor are respectively arranged at the inlet and the outlet of the closed cavity and used for preventing microwaves from leaking.

4. The hot air microwave composite in-situ heat regeneration unit according to claim 3, characterized in that: the preposed milling and heating machine body is provided with a first hot asphalt spraying unit, a first regenerant spraying unit and a first flue gas recovery processing device; the first hot asphalt spraying unit and the first regenerant spraying unit are respectively used for spraying hot asphalt and a regenerant onto the upper layer of the old asphalt pavement; the first flue gas recovery processing device is close to the front milling device and is used for recovering flue gas generated by the front milling heating machine in the milling process;

5. The hot air microwave composite in-situ heat regeneration unit according to claim 3 or 4, characterized in that: the hot air microwave composite in-situ heat regeneration unit also comprises a feeding machine; the feeding machine comprises a feeding machine body, a first hopper is arranged at the front part of the feeding machine body, a material conveying and lifting device is arranged at an outlet of the first hopper and used for conveying and lifting materials, a slewing bearing assembly is arranged at one end, far away from the first hopper, of the material conveying and lifting device, a slewing lifting device is hinged to the slewing bearing assembly, and the slewing lifting device is connected with a cab through a variable amplitude oil cylinder;

6. The hot air microwave composite in-situ heat regeneration unit according to claim 5, characterized in that: the hot air and microwave composite in-situ heat regeneration unit further comprises a remixer, a second hopper is arranged at the front of the remixer, a scraper conveying metering device is arranged at the bottom of the second hopper, a fourth inclined scraper lifting device is arranged at the tail end of the scraper conveying metering device, a first heat connection heating wall is arranged between two bridges at the lower part of the fourth inclined scraper lifting device, and a first stirrer is arranged above the tail end of the remixer body.

7. The hot air microwave composite in-situ heat regeneration unit according to claim 5, characterized in that: the hot air microwave composite in-situ heat regeneration unit also comprises a remixing regenerator; the compound mixing regenerator comprises a compound mixing regenerator body, wherein a second stirrer is arranged at the front part of the compound mixing regenerator body, second thermal connection heating walls which are oppositely arranged are arranged on the left side and the right side of the second stirrer, a plurality of groups of microwave heating walls are arranged behind the second stirrer, a first cloth screw and a first ironing plate are sequentially arranged at the rear end of the compound mixing regenerator body, a second cloth screw and a second ironing plate are sequentially arranged behind the first ironing plate, a horizontal conveying device is arranged between a left supporting beam and a right supporting beam of the compound mixing regenerator body, the horizontal conveying device extends forwards and is connected with a transition hopper, a feed chute extends backwards and is connected with the transition hopper, and an automatic opening discharge door is arranged on a conveying bottom plate of the horizontal conveying device between the transition hopper and the second stirrer.

8. The material adding and re-mixing regeneration method of the hot air and microwave composite in-situ heat regeneration unit according to claim 6, characterized by comprising the following steps:

and step S15, directly adding a new asphalt mixture into a second hopper of the remixer by using a dump truck, metering and conveying the new asphalt mixture to a reclaimed material pile by using a scraper material conveying and metering device, continuously conveying the reclaimed material and the new asphalt mixture to an overhead first stirrer by using a fourth inclined scraper material lifting unit, fully and uniformly stirring to form the material pile, heating the thermal bonding of the milled asphalt pavement by using a first thermal connection heating wall at a temperature not lower than a sixth temperature threshold value, distributing and paving by using an independent paver, and finally rolling and compacting to obtain the reclaimed asphalt pavement.

9. The material adding and re-mixing regeneration method of the hot air and microwave composite in-situ heat regeneration unit according to claim 7, characterized by comprising the following steps:

step S15, adding a new asphalt mixture to the reclaimed material pile mixture of the microwave tunnel heater by using a feeding machine, or adding a new asphalt mixture to a transition hopper of the remixing regenerator, and controlling the new asphalt mixture to enter the second stirrer through opening and closing of a discharge door of the remixing regenerator; the method comprises the steps that a re-mixing regenerator is used for fully and uniformly mixing a regenerated material pile mixture and a new asphalt mixture to form a mixed material pile, when the temperature of the mixed material pile is smaller than a set fifth temperature threshold value, a second microwave heating wall is used for emitting microwaves to heat the mixed material pile, the average temperature of the heated mixed material pile is smaller than or larger than the fifth temperature threshold value, second thermal connection heating walls which are oppositely arranged are arranged on the left side and the right side of a second stirrer are used for heating thermal bonding of a milled asphalt pavement, the heating temperature is larger than or equal to a sixth temperature threshold value, a first-level distribution spiral and a first-level leveling ironing plate are lifted during spreading, a second-level distribution spiral and a second-level basic spreading ironing plate are used for completing distribution and spreading prepressing, and finally, rolling compaction is carried out, so that the regenerated asphalt pavement is obtained.

10. The material adding, re-mixing and additional paving regeneration method based on the hot air microwave composite in-situ heat regeneration unit as claimed in claim 7 is characterized in that: the method comprises the following steps:

step S21, heating the old asphalt pavement by a hot air heater; the heating depth of the old asphalt pavement is a set first depth range value, the highest temperature of the surface layer of the old asphalt pavement is less than or equal to a set first temperature threshold, and the temperature at the first depth range value in the old asphalt pavement is greater than or equal to a set second temperature threshold;

step S22, spraying a regenerant and hot asphalt on the heated old asphalt pavement by using a front milling heater, then carrying out hot milling on the old asphalt pavement within a first depth range by using a front milling device to form a regenerated material pile, wherein the temperature of the regenerated material pile is greater than or equal to a third set temperature threshold value, lifting the regenerated material pile by a first inclined scraper lifting unit to a first horizontal scraper material conveying and heating unit, and carrying out backward conveying, heating and heat preservation to finish the heating and milling operation of a first layer of pavement; then, heating the old asphalt pavement below the first depth range continuously by adopting a heating element below the front milling and heating machine body;

step S23, a second inclined scraper lifting device in the rear milling heater is used for lifting materials to a second horizontal scraper material conveying and heating unit, and the reclaimed material pile formed by the first layer of pavement is conveyed backwards continuously and is heated and insulated; heating the old asphalt pavement below the first depth range continuously by adopting a heating element below the rear milling and heating machine body, controlling the highest temperature of the surface layer to be less than or equal to a set first temperature threshold, and controlling the temperature at a second depth range in the pavement to be greater than or equal to a set second temperature threshold; spraying a regenerant and hot asphalt on the second layer of pavement within the second depth range, carrying out hot milling on the old asphalt pavement within the second depth range by using a rear milling device to form a regenerated material pile, and simultaneously conveying the regenerated material formed on the first layer of pavement to the regenerated material pile by using a second horizontal scraper material conveying and heating unit to form a regenerated material pile mixture, wherein the comprehensive temperature of the regenerated material pile mixture is greater than or equal to a set third temperature threshold;

step S24, a third inclined scraper plate material lifting device in the microwave tunnel heater is used for lifting materials to a tunnel type horizontal material conveying device and conveying the materials backwards, a microwave heating unit is used for emitting microwaves to carry out secondary heating on the regenerated material pile mixture, and the comprehensive temperature of the heated regenerated material pile mixture is greater than or equal to a fourth temperature threshold value;

step S25, the feeder machine is used for driving on the regeneration lane and the left and right lateral lanes to complete the addition of the new asphalt mixture in the regeneration material pile and the transition hopper in the remixing regeneration machine, wherein one part continuously and directly adds the new asphalt mixture to the regeneration material pile gathered after milling, the other part continuously and additionally adds the new asphalt mixture to the transition hopper in the remixing regeneration machine, and then the material conveying device in the feeder machine controls the new asphalt mixture to be conveyed backwards;

11. The hot air microwave composite in-situ heat regeneration unit upper and middle surface layer simultaneous adding and re-mixing regeneration method based on claim 7 is characterized by comprising the following steps of: the adding material re-mixing transfer step of the upper layer and the adding material re-mixing regeneration and paving regeneration step of the middle layer;

step S31, heating the old asphalt pavement by a hot air heater; the heating depth of the old asphalt pavement is a set first depth range value, the highest temperature of the surface layer of the old asphalt pavement is less than or equal to a set first temperature threshold, and the temperature at the first depth range value in the old asphalt pavement is greater than or equal to a set second temperature threshold;

step S32, spraying a regenerant and hot asphalt on the heated old asphalt pavement by using a front milling heater, then carrying out hot milling on the old asphalt pavement within a first depth range by using a front milling device to form a regenerated material pile, wherein the temperature of the regenerated material pile is greater than or equal to a third set temperature threshold value, lifting the regenerated material pile by a first inclined scraper lifting unit to a first horizontal scraper material conveying and heating unit, and carrying out backward conveying, heating and heat preservation to finish the heating and milling operation of a first layer of pavement; then, heating the old asphalt pavement below the first depth range continuously by adopting a heating element below the front milling and heating machine body;

step S33, a second inclined scraper lifting device in the rear milling heater is used for lifting materials to a second horizontal scraper material conveying and heating unit, and the reclaimed material pile formed by the first layer of pavement is conveyed backwards continuously and is heated and insulated; heating the old asphalt pavement below the first depth range continuously by adopting a heating element below the rear milling and heating machine body, controlling the highest temperature of the surface layer to be less than or equal to a set first temperature threshold, and controlling the temperature at a second depth range in the pavement to be greater than or equal to a set second temperature threshold; spraying a regenerant and hot asphalt on the second layer of pavement within the second depth range, carrying out hot milling on the old asphalt pavement within the second depth range by using a rear milling device to form a regenerated material pile, and simultaneously conveying the regenerated material formed on the first layer of pavement to the regenerated material pile by using a second horizontal scraper material conveying and heating unit to form a regenerated material pile mixture, wherein the comprehensive temperature of the regenerated material pile mixture is greater than or equal to a set third temperature threshold;

step S34, a third inclined scraper plate material lifting device in the microwave tunnel heater is used for lifting materials to a tunnel type horizontal material conveying device and conveying the materials backwards, a microwave heating unit is used for emitting microwaves to carry out secondary heating on the regenerated material pile mixture, and the comprehensive temperature of the heated regenerated material pile mixture is greater than or equal to a fourth temperature threshold value;

step S36, heating the old asphalt pavement by a hot air heater; the heating depth of the old asphalt pavement is a set first depth range value, the highest temperature of the surface layer of the old asphalt pavement is less than or equal to a set first temperature threshold, and the temperature at the first depth range value in the old asphalt pavement is greater than or equal to a set second temperature threshold;

step S37, spraying a regenerant and hot asphalt on the heated old asphalt pavement by using a front milling heater, then carrying out hot milling on the old asphalt pavement within a first depth range by using a front milling device to form a regenerated material pile, wherein the temperature of the regenerated material pile is greater than or equal to a third set temperature threshold value, lifting the regenerated material pile by a first inclined scraper lifting unit to a first horizontal scraper material conveying and heating unit, and carrying out backward conveying, heating and heat preservation to finish the heating and milling operation of a first layer of pavement; then, heating the old asphalt pavement below the first depth range continuously by adopting a heating element below the front milling and heating machine body;

step S38, a second inclined scraper lifting device in the rear milling heater is used for lifting materials to a second horizontal scraper material conveying and heating unit, and the reclaimed material pile formed by the first layer of pavement is conveyed backwards continuously and is heated and insulated; heating the old asphalt pavement below the first depth range continuously by adopting a heating element below the rear milling and heating machine body, controlling the highest temperature of the surface layer to be less than or equal to a set first temperature threshold, and controlling the temperature at a second depth range in the pavement to be greater than or equal to a set second temperature threshold; spraying a regenerant and hot asphalt on the second layer of pavement within the second depth range, carrying out hot milling on the old asphalt pavement within the second depth range by using a rear milling device to form a regenerated material pile, and simultaneously conveying the regenerated material formed on the first layer of pavement to the regenerated material pile by using a second horizontal scraper material conveying and heating unit to form a regenerated material pile mixture, wherein the comprehensive temperature of the regenerated material pile mixture is greater than or equal to a set third temperature threshold;

step S39, a third inclined scraper plate material lifting device in the microwave tunnel heater is used for lifting materials to a tunnel type horizontal material conveying device and conveying the materials backwards, a microwave heating unit is used for emitting microwaves to carry out secondary heating on the regenerated material pile mixture, and the comprehensive temperature of the heated regenerated material pile mixture is greater than or equal to a fourth temperature threshold value;