CN110593066A - Temperature raising mixing machine for in-situ heat regeneration of asphalt pavement - Google Patents
Temperature raising mixing machine for in-situ heat regeneration of asphalt pavement Download PDFInfo
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- CN110593066A CN110593066A CN201910808525.0A CN201910808525A CN110593066A CN 110593066 A CN110593066 A CN 110593066A CN 201910808525 A CN201910808525 A CN 201910808525A CN 110593066 A CN110593066 A CN 110593066A
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- E—FIXED CONSTRUCTIONS
- E01—CONSTRUCTION OF ROADS, RAILWAYS, OR BRIDGES
- E01C—CONSTRUCTION OF, OR SURFACES FOR, ROADS, SPORTS GROUNDS, OR THE LIKE; MACHINES OR AUXILIARY TOOLS FOR CONSTRUCTION OR REPAIR
- E01C19/00—Machines, tools or auxiliary devices for preparing or distributing paving materials, for working the placed materials, or for forming, consolidating, or finishing the paving
- E01C19/02—Machines, tools or auxiliary devices for preparing or distributing paving materials, for working the placed materials, or for forming, consolidating, or finishing the paving for preparing the materials
- E01C19/10—Apparatus or plants for premixing or precoating aggregate or fillers with non-hydraulic binders, e.g. with bitumen, with resins, i.e. producing mixtures or coating aggregates otherwise than by penetrating or surface dressing; Apparatus for premixing non-hydraulic mixtures prior to placing or for reconditioning salvaged non-hydraulic compositions
- E01C19/1004—Reconditioning or reprocessing bituminous mixtures, e.g. salvaged paving, fresh patching mixtures grown unserviceable; Recycling salvaged bituminous mixtures; Apparatus for the in-plant recycling thereof
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- E—FIXED CONSTRUCTIONS
- E01—CONSTRUCTION OF ROADS, RAILWAYS, OR BRIDGES
- E01C—CONSTRUCTION OF, OR SURFACES FOR, ROADS, SPORTS GROUNDS, OR THE LIKE; MACHINES OR AUXILIARY TOOLS FOR CONSTRUCTION OR REPAIR
- E01C19/00—Machines, tools or auxiliary devices for preparing or distributing paving materials, for working the placed materials, or for forming, consolidating, or finishing the paving
- E01C19/02—Machines, tools or auxiliary devices for preparing or distributing paving materials, for working the placed materials, or for forming, consolidating, or finishing the paving for preparing the materials
- E01C19/10—Apparatus or plants for premixing or precoating aggregate or fillers with non-hydraulic binders, e.g. with bitumen, with resins, i.e. producing mixtures or coating aggregates otherwise than by penetrating or surface dressing; Apparatus for premixing non-hydraulic mixtures prior to placing or for reconditioning salvaged non-hydraulic compositions
- E01C19/1013—Plant characterised by the mode of operation or the construction of the mixing apparatus; Mixing apparatus
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- E—FIXED CONSTRUCTIONS
- E01—CONSTRUCTION OF ROADS, RAILWAYS, OR BRIDGES
- E01C—CONSTRUCTION OF, OR SURFACES FOR, ROADS, SPORTS GROUNDS, OR THE LIKE; MACHINES OR AUXILIARY TOOLS FOR CONSTRUCTION OR REPAIR
- E01C23/00—Auxiliary devices or arrangements for constructing, repairing, reconditioning, or taking-up road or like surfaces
- E01C23/06—Devices or arrangements for working the finished surface; Devices for repairing or reconditioning the surface of damaged paving; Recycling in place or on the road
- E01C23/065—Recycling in place or on the road, i.e. hot or cold reprocessing of paving in situ or on the traffic surface, with or without adding virgin material or lifting of salvaged material; Repairs or resurfacing involving at least partial reprocessing of the existing paving
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- E—FIXED CONSTRUCTIONS
- E01—CONSTRUCTION OF ROADS, RAILWAYS, OR BRIDGES
- E01C—CONSTRUCTION OF, OR SURFACES FOR, ROADS, SPORTS GROUNDS, OR THE LIKE; MACHINES OR AUXILIARY TOOLS FOR CONSTRUCTION OR REPAIR
- E01C19/00—Machines, tools or auxiliary devices for preparing or distributing paving materials, for working the placed materials, or for forming, consolidating, or finishing the paving
- E01C19/02—Machines, tools or auxiliary devices for preparing or distributing paving materials, for working the placed materials, or for forming, consolidating, or finishing the paving for preparing the materials
- E01C19/10—Apparatus or plants for premixing or precoating aggregate or fillers with non-hydraulic binders, e.g. with bitumen, with resins, i.e. producing mixtures or coating aggregates otherwise than by penetrating or surface dressing; Apparatus for premixing non-hydraulic mixtures prior to placing or for reconditioning salvaged non-hydraulic compositions
- E01C19/1059—Controlling the operations; Devices solely for supplying or proportioning the ingredients
- E01C19/1063—Controlling the operations
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- Engineering & Computer Science (AREA)
- Architecture (AREA)
- Civil Engineering (AREA)
- Structural Engineering (AREA)
- Mining & Mineral Resources (AREA)
- Road Paving Machines (AREA)
Abstract
The invention discloses a temperature-raising mixing machine for in-situ heat regeneration of an asphalt pavement, which comprises a temperature raising device, a material raising device, a storage bin and an intermittent mixing cylinder, wherein the material raising device comprises a material raising sealing pipeline, the material raising device is arranged in the material raising sealing pipeline, an air return pipeline is arranged on the outer side of the material raising sealing pipeline in a clinging manner, one end of the air return pipeline is communicated with the storage bin, the other end of the air return pipeline is communicated with an air return bin, and an air outlet of a fan is communicated with an air inlet chamber of a combustor; after heat exchange and temperature increase are completed in the temperature increasing device, the mixture is conveyed into the material storage device through the material increasing device, hot air continuously heats the mixture in the process of conveying the mixture by the material increasing device, the hot air flows back through the air return pipeline after the heat exchange process is completed, and at the moment, the material increasing sealing pipeline is heated and insulated by the hot air waste heat. The invention can uniformly heat the scarified old asphalt mixture to 140-150 ℃, and better meets the temperature requirement of high-quality regenerated asphalt pavement and modified asphalt pavement regeneration.
Description
Technical Field
The invention relates to special equipment for in-situ thermal regeneration construction of an asphalt pavement, in particular to a temperature raising mixer for in-situ thermal regeneration of the asphalt pavement.
Background
The asphalt pavement on-site thermal regeneration technology can realize the regeneration and the utilization of the original pavement materials, has better treatment effect on pavement functional diseases, and is popularized and applied more in the highway maintenance of China. When the in-situ heat regeneration technology is used for repairing pavement diseases, the paving and rolling temperature of the regenerated mixture directly influences the construction effect, and when the in-situ heat regeneration technology is applied to the modified asphalt pavement, the paving and rolling temperature is higher than that of the common asphalt mixture.
In the traditional hot in-place recycling process, the temperature of the asphalt mixture of the original pavement is raised through a heating unit, and then the recycled materials of the original pavement are raked and loosened to be in a loose state through a raking and loosening device to form material ridges. Then the mixture enters a continuous mixing cylinder to be mixed and then is paved and rolled. At present, after scarification operation is carried out on the in-situ heat regeneration equipment at home and abroad, the asphalt mixture is generally 110-120 ℃, heat loss is prevented for the asphalt mixture entering a stirring cylinder in a heat preservation mode, equipment for further improving the temperature of the asphalt mixture is not provided, the final paving temperature of the mixture is only 110-120 ℃, the temperature requirement for regeneration of high-quality regenerated asphalt pavements and modified asphalt pavements cannot be met, and the temperature of the mixture is heated by a heater, so that a certain temperature difference exists between the pavement surface layer and the bottom layer mixture, although the mixture is stirred and stirred in a certain way, the condition of uneven temperature of the final regenerated asphalt mixture can exist during paving, and the engineering quality is influenced. The mixing cylinders adopted by the existing regeneration equipment are all continuous mixing cylinders (such as a German Vietgen regenerator), the continuous mixing cylinders can not provide sufficient mixing time, the regenerated asphalt mixture is forcibly fed into the mixing cylinders and can be discharged after being mixed for only a short time, the uniformity and the stability of the mixed regenerated asphalt mixture are poor, the action time of a regenerant and the old asphalt mixture is short, and the old asphalt mixture can not be fully reduced in a short time. The existing regeneration equipment only provides a regenerant adding device in the aspect of additives generally, has single function and cannot meet the requirement of simultaneously adding multiple additives in high-quality engineering. These problems greatly affect the quality of the in-situ heat regeneration project.
Disclosure of Invention
Aiming at the technical problems, the invention provides a temperature raising mixer for in-situ thermal regeneration of an asphalt pavement, which can uniformly raise the temperature of an old asphalt mixture subjected to scarification to 140-150 ℃, the temperature of the mixed asphalt mixture is averagely not different, and the final paving temperature is not lower than 130 ℃ after the mixed asphalt mixture is fully and uniformly mixed by an intermittent mixing cylinder.
The technical solution adopted by the invention is as follows:
a temperature raising mixing machine for in-situ thermal regeneration of asphalt pavements comprises a temperature raising device, a material raising device, a storage bin and an intermittent mixing cylinder, wherein the material raising device is obliquely arranged, the temperature raising device is arranged at the bottom end of the material raising device, the storage bin is arranged at the top end of the material raising device, and the intermittent mixing cylinder is arranged below the storage bin;
the temperature raising device comprises a temperature raising cavity, wherein turning devices for turning and stirring the mixture are distributed at the bottom of the temperature raising cavity at intervals, a fan is arranged at the top of one end of the temperature raising cavity, an air return bin is arranged at an air inlet below the fan, and a burner is arranged at the top of the other end of the temperature raising cavity;
the material lifting device comprises a material lifting sealed pipeline, a material lifting device is arranged inside the material lifting sealed pipeline, the bottom end of the material lifting sealed pipeline is communicated with the temperature lifting cavity, the top end of the material lifting sealed pipeline is communicated with the storage bin, an air return pipeline is arranged on the outer side of the material lifting sealed pipeline in a clinging manner, one end of the air return pipeline is communicated with the storage bin, the other end of the air return pipeline is communicated with the air return bin, and an air outlet of the fan is communicated with the air inlet cavity of the combustor;
after heat exchange and temperature increase are completed in the temperature increasing device, the mixture is conveyed into the material storage device through the material increasing device, the mixture is continuously heated by hot air in the process of conveying the mixture by the material increasing device, the hot air flows back through the air return pipeline after the heat exchange process is completed, and at the moment, the shell of the material increasing sealing pipeline is heated and insulated by hot air waste heat.
Preferably, the stirring device comprises a main shaft, stirring blades are arranged on the main shaft, and the main shafts of all the stirring devices are in transmission connection with the hydraulic motor through transmission chains; the mixture is turned and stirred by the turning and stirring blade of the turning and stirring device and is always in a throwing state, the contact area of the mixture in the throwing state and hot air is increased, and the hot air is continuously heated to uniformly raise the temperature of the mixture.
Preferably, the outer side of the main shaft is provided with cooling fan blades, and the cooling fan blades rotate along with the main shaft to perform forced air cooling on the main shaft.
Preferably, the stirring blade comprises a stirring arm, one end of the stirring arm is provided with a stirring blade, the other end of the stirring arm is provided with external threads and fastening bolts, and the middle part of the stirring arm is provided with a cross hole.
Preferably, four stirring arms are sequentially arranged on the circumferential direction of the cross section of the main shaft, the adjacent stirring arms are vertically and crossly distributed, the stirring arms are mutually matched and locked, and are locked through fastening bolts, and the fastening bolts fasten a group of four stirring arms into a whole and are simultaneously locked with the stirring shaft.
Preferably, a dustproof grid mesh for preventing hot air carrying mixture dust from entering the fan is arranged between the temperature raising chamber and the fan, and the dustproof grid mesh is quickly inserted and disassembled.
Preferably, the stocker and the intermittent stirring cylinder are separated by a stocker door, and the stocker door is opened at intervals.
Preferably, the heat-insulating material is attached to the outside of the lifting sealed pipeline.
Preferably, the temperature raising mixer is positioned between the scarifier and the paver, a receiving hopper is arranged at the front part of the temperature raising mixer, a dump truck provides a new asphalt mixture into the receiving hopper, and a heater is arranged in front of the scarifier.
The beneficial technical effects of the invention are as follows:
the invention can uniformly heat the scarified old asphalt mixture to 140-150 ℃, the temperature of the mixed asphalt mixture is averagely not different, simultaneously, a plurality of additives are intensively added, and the final paving temperature is not lower than 130 ℃ after the mixture is fully and uniformly mixed by the intermittent mixing cylinder, thereby better meeting the temperature requirements of high-quality regenerated asphalt pavement and modified asphalt pavement.
Drawings
The invention will be further described with reference to the following detailed description and drawings:
FIG. 1 is a schematic diagram of the location of a temperature raising mixer in an in situ thermal regeneration unit according to the present invention;
FIG. 2 is a schematic view of the overall structure of the temperature raising mixer of the present invention;
FIG. 3 is a schematic diagram of the construction of the temperature raising mixer of the present invention when new asphalt mixture is added;
FIG. 4 is a schematic view of the structural principle of the temperature raising mixer of the present invention, showing the hot air direction;
FIG. 5 is a schematic view of the temperature raising operation of the temperature raising blender of the present invention;
FIG. 6 is a schematic view of a three-dimensional structure of the temperature raising mixer of the present invention;
FIG. 7 is a schematic view of the structural principle of a stirring device in the temperature raising mixer of the present invention;
FIG. 8 is a schematic structural view of a stirring blade in the temperature raising mixer of the present invention;
FIG. 9 is another side view of FIG. 8;
FIG. 10 is a schematic structural view of a plurality of mixing blades of the mixing device;
FIG. 11 is a schematic view of the construction of the present invention in which the turning and mixing blade shovels and throws the material ridge;
FIG. 12 is a schematic three-dimensional view of a temperature riser according to the present invention;
FIG. 13 is a schematic side view of the temperature raising device of the present invention;
FIG. 14 is a schematic view showing the overall structure of the stirring cylinder and the stocker of the present invention;
fig. 15 shows a hopper door open state;
FIG. 16 is a schematic view of the structure of the mixing bowl of the present invention;
fig. 17 shows the three-dimensional vortex motion state of the asphalt mixture in the mixing cylinder.
In the figure: 1-temperature raising device, 101-temperature raising chamber, 102-stirring device, 1021-main shaft, 1022-stirring blade, 1023-stirring arm, 1024-stirring blade, 1025-external thread, 1026-fastening bolt, 1027-cross hole, 103-fan, 104-return air bin, 105-burner, 106-return air pipeline, 2-material raising device, 201-sealing pipeline, 202-material raising device, 3-storage bin, 4-intermittent stirring cylinder, 401-stirring cylinder blade, 402-discharge port, 5-hydraulic motor, 6-cooling fan blade, 7-dustproof grid, 8-storage bin gate, 9-temperature raising mixer, 10-scarification device, 11-paver, 12-receiving hopper, 13-dumper, 14-heater, 15-original road surface cleaning material, 16-paved new road surface and 17-additive nozzle.
Detailed Description
Combine the figure, a temperature raising mixing machine for bituminous paving hot in-place recycling, mix jar 4 including carrying temperature ware 1, carrying material device 2, storage silo 3 and intermittent type formula, carry 2 slopes of material device and arrange, carry temperature ware 1 and set up in the bottom of carrying material device 2, and storage silo 3 sets up on the top of carrying material device 2, and intermittent type formula mixes jar 4 setting in the below of storage silo. The temperature raising device 1 comprises a temperature raising cavity 101, a stirring device 102 for stirring a mixture is arranged at the bottom of the temperature raising cavity at intervals, a fan 103 is arranged at the top of one end of the temperature raising cavity, an air return bin 104 is arranged at an air inlet below the fan, and a burner 105 is arranged at the top of the other end of the temperature raising cavity. The material lifting device comprises a material lifting sealing pipeline 201, a material lifting device 202 is arranged inside the material lifting sealing pipeline, the bottom end of the material lifting sealing pipeline 201 is communicated with a temperature lifting cavity 101, the top end of the material lifting sealing pipeline 201 is communicated with a storage bin 3, an air return pipeline 106 is tightly attached to the outer side of the material lifting sealing pipeline, one end of the air return pipeline is communicated with the storage bin 3, the other end of the air return pipeline is communicated with an air return bin 104, and an air outlet of a fan is communicated with an air inlet cavity of a combustor. After heat exchange and temperature increase are completed in the temperature increasing device, the mixture is conveyed into the material storage device through the material increasing device, the mixture is continuously heated by hot air in the process of conveying the mixture by the material increasing device, the hot air flows back through the air return pipeline after the heat exchange process is completed, and at the moment, the shell of the material increasing sealing pipeline is heated and insulated by hot air waste heat.
As a further design of the present invention, the stirring device 102 includes a main shaft 1021, a stirring blade 1022 is disposed on the main shaft 1021, and the main shafts of all the stirring devices are in transmission connection with the hydraulic motor 5 through a transmission chain. The mixture is turned and stirred by the turning and stirring blade of the turning and stirring device and is always in a throwing state, the contact area of the mixture in the throwing state and hot air is increased, and the hot air is continuously heated to uniformly raise the temperature of the mixture.
Furthermore, the outer side of the main shaft is provided with cooling fan blades 6, and the cooling fan blades 6 rotate along with the main shaft to perform forced air cooling on the main shaft.
Further, the stirring blade 1022 includes a stirring arm 1023, one end of the stirring arm is provided with a stirring blade 1024, the other end of the stirring arm is provided with an external thread 1025 and a fastening bolt 1026, and a cross hole 1027 is arranged in the middle of the stirring arm.
Furthermore, four stirring arms 1023 are arranged in sequence on the circumferential direction of the cross section of the spindle, the adjacent stirring arms are distributed in a vertical cross mode, the stirring arms are matched and locked with each other, and are locked through fastening bolts, and the fastening bolts fasten a group of four stirring arms into a whole and are simultaneously locked with the spindle 1021.
Furthermore, a dustproof grid 7 used for preventing hot air carrying mixture dust from entering the fan is arranged between the temperature raising cavity and the fan, and the dustproof grid 7 is quickly inserted and disassembled.
Furthermore, the stocker and the intermittent mixing cylinder are separated by a stocker bin gate 8, and the stocker bin gate 8 is opened at intervals; the intermittent stirring cylinder 4 is provided with a stirring cylinder blade 401 inside and a discharge port 402 at the bottom.
Furthermore, a heat insulation material is attached to the outside of the material lifting sealing pipeline so as to enhance the heat insulation effect.
Furthermore, the temperature raising mixer 9 is positioned between the scarifier 10 and the paver 11, a receiving hopper 12 is arranged at the front part of the temperature raising mixer, a dump truck 13 provides a new asphalt mixture into the receiving hopper, and a heater 14 is arranged in front of the scarifier.
The working position of the temperature raising mixer is between the scarifier and the paver, the maximum advancing speed is 4 m/min during working, and the working process can be briefly described as follows: the new asphalt mixture added by the receiving hopper and the material ridge formed by the scarifier are taken into the temperature raising device together, the mixture is conveyed into the material storage device by the material lifting device after being uniformly turned and stirred and heated by hot air provided by the temperature raising device, the external doping agent is simultaneously and intensively added into the material storage device, the material storage device and the stirring cylinder are intelligently controlled to complete intermittent stirring in a matching way, and finally the uniformly mixed regenerated asphalt mixture is put into the paver for paving.
The receiving hopper is supplied by the dump truck, when the old road surface causes the mixture of the original road surface to be lost due to ruts and other reasons, a part of new asphalt mixture can be supplemented through the receiving hopper, and the maximum 30 percent of the addition amount of the new asphalt mixture can be realized by adjusting the running speed of the scraping plate in the receiving hopper.
The temperature lifter is a core component of the equipment, and is internally provided with a stirring blade for throwing the mixture and a hot air heating system. When the mixture is taken into the temperature raising device, the turning and stirring blade is driven by the hydraulic motor to rotate and stir at a rotating speed of at least 80 revolutions per minute, and the L-shaped blade pockets and throws the asphalt mixture in the temperature raising device, so that the asphalt mixture is always in a floating and loose state; the hot air is blown out from the heating box above the temperature lifter to directly impact the thrown asphalt mixture for heating, the asphalt mixture in the throwing state has larger heat exchange contact area, and the mixture of the temperature lifter is always in the stirring state and is uniformly heated, so that the temperature of the asphalt mixture can be quickly and uniformly raised from 110-plus-120 ℃ to 140-plus-150 ℃ in a short time.
The asphalt mixture heated by the temperature raising device is sent into the material storage device by the material raising device, the whole material raising device is externally attached with a heat insulation material, and the bottom of the material raising device is provided with a waste heat return air pipeline for utilizing the waste heat of hot air in the temperature raising device. And the heat loss of the asphalt mixture in a material lifting device is reduced. The running speed of the lifting device is determined by the advancing speed and the scarification depth.
The material lifting device sends the regenerated asphalt mixture after uniform temperature lifting and hot air into the material storage device to be stored and added with the admixture, the material storage device is internally provided with a metering device and a plurality of admixture simultaneous adding devices, the admixture is accurately metered and added to the asphalt mixture entering the material storage device, the admixture is more accurate than the traditional mode of calculating the admixture amount of the regenerant through the traveling speed of a vehicle set, and the functionality is stronger.
The bin gate between the material storage device and the mixing cylinder is intelligently controlled to be opened and closed through a computer, when the mixed materials are being mixed in the mixing cylinder, the bin gate of the material storage device is closed to store the mixed materials and add an external additive, and after the mixed materials are uniformly mixed and discharged by the mixing cylinder, the bin gate of the material storage device is opened to place the mixed materials into the mixing cylinder, so that intermittent mixing is realized.
The stirring blades specially designed in the stirring cylinder can ensure that all the asphalt mixtures are subjected to three-dimensional vortex type stirring in the stirring cylinder, violent exchange is generated between the asphalt mixtures, the admixture and the asphalt mixtures are uniformly acted, and the admixture fully exerts the performance.
The asphalt reclaimed material which is mixed well by uniformly raising the temperature enters a receiving hopper of a paver to carry out paving and rolling operation, and the paving temperature is ensured to be not lower than 130 ℃.
The invention will be further described with reference to the accompanying drawings, respectively:
fig. 1 shows the position of the temperature raising mixer in the hot in-place recycling unit, which is positioned between the scarifier and the paver and is provided with new asphalt mixture by the dump truck.
Fig. 2 shows that the temperature raising mixer related to the invention mainly comprises a receiving hopper, a temperature raising device, a material storage device, an external additive centralized adding device, a mixing cylinder, a burner, a fan, a transmission device and the like.
FIG. 3 is a schematic diagram of construction of the temperature raising mixer when new asphalt mixture is added. The temperature raising mixer can meet the new asphalt mixture mixing ratio of 30 percent at most. The method comprises the steps of loading a new asphalt mixture into a receiving hopper by a self-discharging truck, adjusting the running speed by a scraper according to the addition amount of the new asphalt mixture determined by a thermal regeneration mix proportion test, feeding the new asphalt mixture and the scarified old materials into a temperature raising device together for stirring and raising the temperature, feeding the raised regenerated asphalt mixture into a material storage device by a material raising device, completing mixture mixing by matching with a mixing cylinder, and finally placing the material storage device into a paver for paving.
Fig. 4 is a hot air circulation utilization drawing, under the action of positive pressure guiding of a fan, hot air enters a temperature lifter from a combustion chamber, enters a material storage device after heat exchange is completed in the lifter, finally enters the fan through an air return pipeline on the wall of the material storage device, and is sent to a combustor again by the fan to participate in combustion.
Fig. 5 is a schematic diagram of the temperature raising process of the temperature raising device, wherein a stirring device for stirring the mixture is arranged in the temperature raising device, the power of the stirring device is driven by a hydraulic motor, and the hydraulic motor drives 4 main shafts through a transmission chain. The main shaft drives the stirring leaves to stir.
Firstly, the mixture is collected into the temperature raising device, the mixture is turned and stirred by the turning and stirring device blades and is always in a throwing state, hot air is continuously heated to uniformly raise the temperature of the mixture, the contact area of the mixture in the throwing state and the hot air is increased, the heat utilization efficiency is improved, the mixture stirred constantly is guaranteed to be uniformly raised in temperature, and the temperature difference is not generated in the mixture.
After the temperature of the mixture is changed in the temperature raising device, the mixture is conveyed into the material storage device through the material raising device, the mixture is continuously heated by hot air in the process, the material raising device is of a sealing structure, and the heat insulation material is attached to the material raising device, so that the heat loss of the mixture in the material raising process is reduced.
The stocker is started at regular time to put the reclaimed materials into the mixing cylinder, in the process, a small amount of hot air enters the mixing cylinder, the heat loss of the mixed materials in the mixing cylinder is reduced, and the temperature of the reclaimed materials during final paving is ensured.
After the heat exchange process is completed, hot air flows back through an air return pipeline on the wall of the material storage device, and at the moment, the shell of the material lifting device is heated by the hot air waste heat, so that the heat preservation work is further completed.
Fig. 6 is a three-dimensional schematic diagram of a temperature lifter and a material lifting device, wherein two sides of the material lifting device are respectively provided with an air return pipeline with an accurately calculated sectional area, so that the whole hot air heating system is ensured to work stably. The hot air passing through the air return pipeline returns to the combustor to continuously participate in combustion, so that the residual heat is fully utilized, and the generated asphalt smoke is combusted at high temperature, thereby achieving the purposes of environmental protection and energy conservation.
Fig. 7 shows a thermostat turning device powered by two hydraulic motors, each driving two spindles via drive chains, each spindle being equipped with 12 sets of turning units. The inclination angle of each group of stirring units is 30 degrees. The turning and mixing blades which are densely arranged enable the reclaimed materials to be in a throwing state all the time after entering the temperature raising device, so that the contact area of the mixed materials and hot air is greatly increased, and the temperature raising uniformity of the mixed materials is guaranteed. The main shaft outside all is equipped with the cooling flabellum, and the cooling flabellum follows the main shaft rotation and to the forced air cooling of main shaft, avoids providing power for the heat sink alone, reduces the overall energy consumption. The rotating speed of a hydraulic motor of the stirring device can be steplessly adjusted, and the corresponding rotating speed is adjusted according to the advancing speed of the vehicle set, so that the aim of uniformly throwing the mixture collected in the temperature raising device is fulfilled.
Fig. 8-10 are schematic structural views of the turning and stirring blade of the temperature lifter, and a fixed angle exists between the stirring blade and the stirring arm to lift the mixture to the maximum extent. The turning and mixing blade can be independently replaced by screwing out the fastening bolt at the bottom of the turning and mixing blade, and the turning and mixing blade is simple in structure, easy to disassemble and convenient to maintain. The stirring arms are mutually matched and locked, and a group of four stirring arms are fastened into a whole by bolts and are simultaneously locked with the stirring shaft. When the stirring blades are damaged, the stirring blades are detached and replaced. The turning and stirring blade and the main shaft both adopt wear-resistant steel as raw materials, so that the service life is prolonged.
Fig. 11 shows that when the temperature raising mixer advances, the material ridge is collected into the temperature raising mixer, the material ridge is shoveled and thrown into the air by the turning and mixing blade driven by the hydraulic motor, so that the contact area between the asphalt mixture and the hot air is maximized, the hot air is blown into the temperature raising mixer to contact with the thrown mixture for heat exchange, the lower mixture is thrown by the turning and mixing blade continuously, the mixture is in a stirring state all the time, the heating is average, and the temperature of the asphalt mixture is uniformly raised to the construction temperature.
FIG. 12 is a schematic diagram of a three-dimensional structure of a temperature raising mixer, the temperature raising mixer is an independent sleeve and is installed below the heating box through bolts, and the temperature raising mixer is simple to assemble and disassemble and convenient to overhaul.
Fig. 13 is that the kneck that return air duct got into the return air case is equipped with the dust screen, prevents that hot-blast mixture dust that carries from getting into fan and combustor, and the dust screen adopts and inserts the dismouting mode soon, and it is convenient to change.
Fig. 14-15 are overall schematic diagrams of a mixing cylinder and a material storage device, wherein the material lifting device feeds the asphalt mixture into the material storage device, a plurality of admixture can be simultaneously and intensively added in the material storage device, and the bin gate of the material storage device is opened at intervals to feed the asphalt mixture into the mixing cylinder for mixing.
FIGS. 16-17 are schematic views of a mixing cylinder with mixing blades arranged to provide three-dimensional vortex mixing of the mixture in the mixing cylinder; in the vortex exchange areas of the two stirring cycles, the asphalt materials are violently exchanged; the mixing time of 50 seconds can ensure that the admixture can fully exert the performance function, and the asphalt mixture has uniform temperature and good stability.
Parts not described in the above modes can be realized by adopting or referring to the prior art.
The foregoing merely illustrates the principles and preferred embodiments of the invention and it will be appreciated by those skilled in the art that variations and modifications may be made without departing from the invention in its construction and this is to be considered as within the scope of the invention.
Claims (9)
1. A temperature raising mixing machine for in-situ thermal regeneration of asphalt pavements is characterized in that: the batch mixer comprises a temperature lifter, a material lifting device, a storage bin and an intermittent mixing cylinder, wherein the material lifting device is obliquely arranged, the temperature lifter is arranged at the bottom end of the material lifting device, the storage bin is arranged at the top end of the material lifting device, and the intermittent mixing cylinder is arranged below the storage bin;
the temperature raising device comprises a temperature raising cavity, wherein turning devices for turning and stirring the mixture are distributed at the bottom of the temperature raising cavity at intervals, a fan is arranged at the top of one end of the temperature raising cavity, an air return bin is arranged at an air inlet below the fan, and a burner is arranged at the top of the other end of the temperature raising cavity;
the material lifting device comprises a material lifting sealed pipeline, a material lifting device is arranged inside the material lifting sealed pipeline, the bottom end of the material lifting sealed pipeline is communicated with the temperature lifting cavity, the top end of the material lifting sealed pipeline is communicated with the storage bin, an air return pipeline is arranged on the outer side of the material lifting sealed pipeline in a clinging manner, one end of the air return pipeline is communicated with the storage bin, the other end of the air return pipeline is communicated with the air return bin, and an air outlet of the fan is communicated with the air inlet cavity of the combustor;
after heat exchange and temperature increase are completed in the temperature increasing device, the mixture is conveyed into the material storage device through the material increasing device, the mixture is continuously heated by hot air in the process of conveying the mixture by the material increasing device, the hot air flows back through the air return pipeline after the heat exchange process is completed, and at the moment, the shell of the material increasing sealing pipeline is heated and insulated by hot air waste heat.
2. The temperature raising mixer for hot in-place recycling of asphalt pavements as claimed in claim 1, wherein: the stirring device comprises a main shaft, stirring blades are arranged on the main shaft, and the main shafts of all the stirring devices are in transmission connection with a hydraulic motor through transmission chains; the mixture is turned and stirred by the turning and stirring blade of the turning and stirring device and is always in a throwing state, the contact area of the mixture in the throwing state and hot air is increased, and the hot air is continuously heated to uniformly raise the temperature of the mixture.
3. The temperature raising mixer for hot in-place recycling of asphalt pavements as claimed in claim 2, wherein: and cooling fan blades are arranged on the outer side of the main shaft and rotate along with the main shaft to perform forced air cooling on the main shaft.
4. The temperature raising mixer for hot in-place recycling of asphalt pavements as claimed in claim 2, wherein: the stirring blade comprises a stirring arm, a stirring blade is arranged at one end of the stirring arm, external threads and fastening bolts are arranged at the other end of the stirring arm, and a cross hole is formed in the middle of the stirring arm.
5. The temperature raising mixer for hot in-place recycling of asphalt pavements as claimed in claim 4, wherein: four stirring arms are sequentially arranged on the circumferential direction of the cross section of the main shaft, the adjacent stirring arms are vertically and crossly distributed, the stirring arms are mutually matched and locked, and are locked through fastening bolts, and the fastening bolts fasten a group of four stirring arms into a whole and are locked with the stirring shaft.
6. The temperature raising mixer for hot in-place recycling of asphalt pavements as claimed in claim 1, wherein: a dustproof grid net used for preventing hot air carrying mixture dust from entering the fan is arranged between the temperature raising cavity and the fan, and the dustproof grid net adopts a quick-insertion dismounting mode.
7. The temperature raising mixer for hot in-place recycling of asphalt pavements as claimed in claim 1, wherein: the stocker and the intermittent mixing cylinder are separated by a stocker bin gate, and the stocker bin gate is opened at intervals.
8. The temperature raising mixer for hot in-place recycling of asphalt pavements as claimed in claim 1, wherein: the heat insulating material is attached to the outside of the material lifting sealing pipeline.
9. The temperature raising mixer for hot in-place recycling of asphalt pavements as claimed in claim 1, wherein: the temperature raising mixer is positioned between the scarifier and the paver, the front part of the temperature raising mixer is provided with a receiving hopper, a dump truck provides a new asphalt mixture into the receiving hopper, and a heater is arranged in front of the scarifier.
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| CN201910808525.0A CN110593066A (en) | 2019-08-29 | 2019-08-29 | Temperature raising mixing machine for in-situ heat regeneration of asphalt pavement |
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| CN201910808525.0A CN110593066A (en) | 2019-08-29 | 2019-08-29 | Temperature raising mixing machine for in-situ heat regeneration of asphalt pavement |
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| CN110593066A true CN110593066A (en) | 2019-12-20 |
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| CN201910808525.0A Pending CN110593066A (en) | 2019-08-29 | 2019-08-29 | Temperature raising mixing machine for in-situ heat regeneration of asphalt pavement |
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| CN111501484A (en) * | 2020-04-23 | 2020-08-07 | 江苏集萃道路工程技术与装备研究所有限公司 | Heating device for giving consideration to secondary temperature raising and pavement thermal connection of asphalt mixture |
| CN111519495A (en) * | 2020-04-07 | 2020-08-11 | 江苏集萃道路工程技术与装备研究所有限公司 | Material lifting device for on-site remixer |
| CN113213065A (en) * | 2021-01-29 | 2021-08-06 | 吉林省嘉鹏集团有限公司 | Bulk material lifting device and using method |
| CN113338144A (en) * | 2021-05-20 | 2021-09-03 | 嘉鹏再升科技（深圳）股份有限公司 | Clean in-situ thermal regeneration complete set system |
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| CN113338144A (en) * | 2021-05-20 | 2021-09-03 | 嘉鹏再升科技（深圳）股份有限公司 | Clean in-situ thermal regeneration complete set system |
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