CN107165026A - Sub-material and mixing and stirring system for producing modified pitch - Google Patents

Sub-material and mixing and stirring system for producing modified pitch Download PDF

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Publication number
CN107165026A
CN107165026A CN201710571292.8A CN201710571292A CN107165026A CN 107165026 A CN107165026 A CN 107165026A CN 201710571292 A CN201710571292 A CN 201710571292A CN 107165026 A CN107165026 A CN 107165026A
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CN
China
Prior art keywords
building stones
mixing
group
sub
modified pitch
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Pending
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CN201710571292.8A
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Chinese (zh)
Inventor
赵佳丽
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Individual
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Individual
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Priority to CN201710571292.8A priority Critical patent/CN107165026A/en
Publication of CN107165026A publication Critical patent/CN107165026A/en
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Classifications

    • EFIXED CONSTRUCTIONS
    • E01CONSTRUCTION OF ROADS, RAILWAYS, OR BRIDGES
    • E01CCONSTRUCTION OF, OR SURFACES FOR, ROADS, SPORTS GROUNDS, OR THE LIKE; MACHINES OR AUXILIARY TOOLS FOR CONSTRUCTION OR REPAIR
    • E01C19/00Machines, tools or auxiliary devices for preparing or distributing paving materials, for working the placed materials, or for forming, consolidating, or finishing the paving
    • E01C19/02Machines, 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
    • EFIXED CONSTRUCTIONS
    • E01CONSTRUCTION OF ROADS, RAILWAYS, OR BRIDGES
    • E01CCONSTRUCTION OF, OR SURFACES FOR, ROADS, SPORTS GROUNDS, OR THE LIKE; MACHINES OR AUXILIARY TOOLS FOR CONSTRUCTION OR REPAIR
    • E01C19/00Machines, tools or auxiliary devices for preparing or distributing paving materials, for working the placed materials, or for forming, consolidating, or finishing the paving
    • E01C19/02Machines, 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
    • E01C19/05Crushing, pulverising or disintegrating apparatus; Aggregate screening, cleaning, drying or heating apparatus; Dust-collecting arrangements specially adapted therefor
    • EFIXED CONSTRUCTIONS
    • E01CONSTRUCTION OF ROADS, RAILWAYS, OR BRIDGES
    • E01CCONSTRUCTION OF, OR SURFACES FOR, ROADS, SPORTS GROUNDS, OR THE LIKE; MACHINES OR AUXILIARY TOOLS FOR CONSTRUCTION OR REPAIR
    • E01C19/00Machines, tools or auxiliary devices for preparing or distributing paving materials, for working the placed materials, or for forming, consolidating, or finishing the paving
    • E01C19/02Machines, 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
    • E01C19/10Apparatus 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
    • E01C19/1013Plant characterised by the mode of operation or the construction of the mixing apparatus; Mixing apparatus
    • E01C19/104Mixing by means of movable members in a non-rotating mixing enclosure, e.g. stirrers
    • EFIXED CONSTRUCTIONS
    • E01CONSTRUCTION OF ROADS, RAILWAYS, OR BRIDGES
    • E01CCONSTRUCTION OF, OR SURFACES FOR, ROADS, SPORTS GROUNDS, OR THE LIKE; MACHINES OR AUXILIARY TOOLS FOR CONSTRUCTION OR REPAIR
    • E01C19/00Machines, tools or auxiliary devices for preparing or distributing paving materials, for working the placed materials, or for forming, consolidating, or finishing the paving
    • E01C19/02Machines, 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
    • E01C19/10Apparatus 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
    • E01C19/1059Controlling the operations; Devices solely for supplying or proportioning the ingredients
    • E01C19/1068Supplying or proportioning the ingredients
    • E01C19/1072Supplying or proportioning the ingredients the solid ingredients

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  • Engineering & Computer Science (AREA)
  • Architecture (AREA)
  • Civil Engineering (AREA)
  • Structural Engineering (AREA)
  • Road Paving Machines (AREA)
  • Processing Of Solid Wastes (AREA)

Abstract

Sub-material and mixing and stirring system for producing modified pitch, ingredient sector is sorted including building stones and hot material mixes mechanism, the building stones sorting ingredient sector includes batch mixing stir storehouse, building stones screening machine, a building stones measuring chute, No. two building stones measuring chutes, No. three building stones measuring chutes, No. four building stones measuring chutes, one group of Weighing valve and discharge nozzle, and the top of the batch mixing stir storehouse is open funnel-form warehouse;The invention provides the sub-material and mixing and stirring system for producing modified pitch, reasonable in design, sub-material is carried out to the building stones of different-diameter, and it is precisely controlled corresponding specification building stones consumption, be conducive to the quality control of modified pitch, the thermal agitation to the various dispensings of modified pitch can be efficiently completed simultaneously, it is safe and reliable, with good practical value.

Description

Sub-material and mixing and stirring system for producing modified pitch
Technical field
The present invention relates to equipment of producing modified asphalt technical field, and in particular to for producing the sub-material of modified pitch and mixing Close stirring system.
Background technology
Many changes occur for highroad and road:The magnitude of traffic flow and traveling frequency sharp increase, the axle weight of freight is not Disconnected increase, generally carries out divided lane one-way traffic, it is desirable to further improve the energy of Rut resistance under road surface resistance to flow, i.e. high temperature Power;Improve flexible and elasticity, i.e., the ability of cracking resistance under low temperature;Improve abrasion performance ability and increase the service life.Modern architecture Thing generally uses large-span prestressed roof boarding, it is desirable to which roof waterpoof material adapts to big displacement, more tolerant to harsh height wet Time condition, durability more preferably, there is tack, and convenient construction reduces maintenance load.These changes that use environment occurs are to stone The performance of oil asphalt proposes stern challenge.To petroleum asphalt modified, above-mentioned harsh use requirement is adapted it to, people is caused Attention.
At present, existing modified pitch is mainly mixed in proportion by the building stones of different size, pitch and miberal powder additive Close stirring to form, existing building stones do not have to be sieved before stir storehouse is entered, and are so unfavorable for all size building stones consumption Control, be unfavorable for needing in the control of product quality, modified pitch production line carrying out various dispensings at high temperature with pitch Thermal agitation, existing rabbling mechanism stirring efficiency is low.
The content of the invention
The purpose of the present invention primarily to for above-mentioned technical problem, and provide sub-material for producing modified pitch and Mixing and stirring system.
The present invention includes building stones and sorts ingredient sector and hot material mixing mechanism, and the building stones sorting ingredient sector includes Batch mixing stir storehouse, building stones screening machine, building stones measuring chute, No. two building stones measuring chutes, No. three building stones measuring chutes, a No. four building stones meters Storehouse, one group of Weighing valve and discharge nozzle are measured, the top of the batch mixing stir storehouse is open funnel-form warehouse, the building stones The frame of screening machine is fixedly mounted on the side of batch mixing stir storehouse, and one group of discharging opening of building stones screening machine is located at batch mixing stir storehouse Top, a building stones measuring chute, No. two building stones measuring chutes, No. three building stones measuring chutes and No. four building stones measuring chutes are solid respectively Dingan County mounted in batch mixing stir storehouse open top at, one group of Weighing valve be separately mounted to a building stones measuring chute, The exit of No. two building stones measuring chutes, No. three building stones measuring chutes and No. four building stones measuring chutes, one end of the discharge nozzle is arranged on The exit of batch mixing stir storehouse, building stones sorting ingredient sector include mixing and stirring tank, bitumen feed pipe, building stones feed hopper, Steam pipe coil, miberal powder pipe, discharge nozzle and agitating device, the mixing and stirring tank are provided with bitumen feed mouth, building stones charging aperture, steam Coil inlet, steam pipe coil outlet, miberal powder entrance, modified asphalt outlet and one group of agitating shaft mounting hole, the bitumen feed pipe, Building stones feed hopper, miberal powder pipe and discharge nozzle connect with bitumen feed mouth, building stones charging aperture, miberal powder entrance and modified asphalt outlet respectively Lead to, and the entrance of building stones feed hopper is connected with discharge nozzle, entrance and the outlet of the steam pipe coil are each passed through steam pipe coil and entered Mouth and steam pipe coil outlet, the agitating device include one group of agitating shaft and one group of helical mixing blade, one group of agitating shaft One end be movably arranged on respectively by bearing block at one group of agitating shaft mounting hole, and one group of agitating shaft from top to bottom equi-spaced apart Interlaced arrangement, one group of helical mixing blade is respectively and fixedly installed on one group of agitating shaft.
The building stones sorting ingredient sector also has outlet Weighing valve, and one end of the discharge nozzle is by exporting poidometer Measure the exit that valve is arranged on batch mixing stir storehouse.
The building stones sorting ingredient sector also has waste material pipe and splicing funnel, and the waste material pipe is fixedly mounted on batch mixing stirring The side in storehouse, the top of the waste material pipe is provided with splicing funnel, and splicing funnel is located at the lower section of building stones screening machine caudal end egress.
Building stones sorting ingredient sector also has one group of decelerating through motor thermomechanical components, one group of decelerating through motor thermomechanical components it is dynamic Power output shaft is connected with one group of agitating shaft transmission respectively.
The building stones sorting ingredient sector also has baiting valve, and the discharge nozzle is connected in mixing and stirring tank by baiting valve At modified asphalt outlet.
The mixing and stirring tank is composited by sandwich construction, and the tank skin of mixing and stirring tank is followed successively by stainless steel from outside to inside Surrounding layer, outer glass layer, vacuum interlayer, interior stainless steel layer and interior ceramic coating.
The method have the advantages that:The invention provides the sub-material and mixing and stirring system for producing modified pitch, structure is set Meter is reasonable, and sub-material is carried out to the building stones of different-diameter, and is precisely controlled corresponding specification building stones consumption, is conducive to the matter of modified pitch Control is measured, while the thermal agitation to the various dispensings of modified pitch can be efficiently completed, it is safe and reliable, with good practical valency Value.
Brief description of the drawings
Fig. 1 is schematic structural view of the invention.
Fig. 2 is building stones sorting ingredient sector structural representation of the present invention.
Fig. 3 is that hot material of the present invention mixes mechanism structural representation.
Fig. 4 is the cross section structure schematic diagram that the present invention mixes tank skin.
Embodiment
As shown in drawings, the present invention includes building stones sorting ingredient sector and hot material mixes mechanism, the building stones sorting Ingredient sector include batch mixing stir storehouse 50, building stones screening machine 51, building stones measuring chute 52, No. two building stones measuring chutes 53, No. three Building stones measuring chute 54, No. four building stones measuring chutes 55, one group of Weighing valve 56 and discharge nozzle 57, the batch mixing stir storehouse 50 Top is open funnel-form warehouse, and the frame of the building stones screening machine 51 is fixedly mounted on the side of batch mixing stir storehouse 50, and One group of discharging opening of building stones screening machine 51 is located at the top of batch mixing stir storehouse 50, a building stones measuring chute 52, No. two building stones The top that measuring chute 53, No. three building stones measuring chutes 54 and No. four building stones measuring chutes 55 are respectively and fixedly installed to batch mixing stir storehouse 50 is opened At mouthful, one group of Weighing valve 56 is separately mounted to a building stones measuring chute 52, No. two building stones measuring chutes 53, No. three stones Expect the exit of measuring chute 54 and No. four building stones measuring chutes 55, one end of the discharge nozzle 57 is arranged on going out for batch mixing stir storehouse 50 At mouthful, the building stones sorting ingredient sector includes mixing and stirring tank 70, bitumen feed pipe 71, building stones feed hopper 72, steam pipe coil 73rd, miberal powder pipe 74, discharge nozzle 75 and agitating device, the mixing and stirring tank 70 are provided with bitumen feed mouth, building stones charging aperture, steam Coil inlet, steam pipe coil outlet, miberal powder entrance, modified asphalt outlet and one group of agitating shaft mounting hole, the bitumen feed pipe 71st, building stones feed hopper 72, miberal powder pipe 74 and discharge nozzle 75 respectively with bitumen feed mouth, building stones charging aperture, miberal powder entrance and modification Asphalt outlet is connected, and the entrance of building stones feed hopper 72 is connected with discharge nozzle 57, entrance and the outlet point of the steam pipe coil 73 Not Chuan Guo steam pipe coil entrance and steam pipe coil outlet, the agitating device include one group of agitating shaft 76 and one group of auger leaf Piece 77, one end of one group of agitating shaft 76 is movably arranged at one group of agitating shaft mounting hole by bearing block respectively, and one group The from top to bottom equi-spaced apart interlaced arrangement of agitating shaft 76, one group of helical mixing blade 77 is respectively and fixedly installed to one group of stirring On axle 76.
The building stones sorting ingredient sector also has outlet Weighing valve 58, and one end of the discharge nozzle 57 is claimed by exporting Metering valve 58 is arranged on the exit of batch mixing stir storehouse 50.
The building stones sorting ingredient sector also has waste material pipe 59 and splicing funnel 60, and the waste material pipe 59 is fixedly mounted on mixed Expect the side of stir storehouse 50, the top of the waste material pipe 59 is provided with splicing funnel 60, and splicing funnel 60 is located at building stones screening machine The lower section of 51 caudal end egresses.
The building stones sorting ingredient sector also has one group of decelerating through motor thermomechanical components 78, one group of decelerating through motor thermomechanical components 78 Power output shaft be connected respectively with the transmission of one group of agitating shaft 76.
The building stones sorting ingredient sector also has baiting valve 79, and the discharge nozzle 75 is connected by baiting valve 79 to be stirred in mixing At the modified asphalt outlet for mixing tank 70.
The mixing and stirring tank 70 is composited by sandwich construction, and the tank skin of mixing and stirring tank 70 is followed successively by not from outside to inside Become rusty steel surrounding layer 70-1, outer glass layer 70-2, vacuum interlayer 70-3, interior stainless steel layer 70-4 and interior ceramic coating 70-5. Using the mixing and stirring tank 70 of multi-layer compound structure, heat insulation effect is protruded, it is to avoid the loss of heat, interior ceramic coating 70-5 can be kept away The material exempted from agitator tank corrodes to tank body.
Working method and principle:Mixing building stones in the Drying of front end are lifted entering to building stones screening machine 51 by elevator Mouthful, building stones screening machine 51 carries out level Four screening according to the diameter of building stones, and corresponding level Four building stones are respectively fallen in a building stones meter Storehouse 52 is measured, in No. two building stones measuring chutes 53, No. three building stones measuring chutes 54, No. four building stones measuring chutes 55, after the completion of screening, according to changing Property asphalt formulations part by weight, one group of Weighing valve 56 opens, and puts the corresponding specification building stones of setting quality, is finally completed The proportioning of building stones, exceeded building stones drop into splicing funnel 60 from the tail end of building stones screening machine 51, and are finally exported from waste material pipe 59, The mixing building stones that setting weight can be put by opening outlet Weighing valve 58 fall into building stones feed hopper 72, and enter mixing Tank 70, pitch is passed into mixing and stirring tank 70 by bitumen feed pipe 71, and miberal powder etc. adds auxiliary material and is passed into by miberal powder pipe 74 Mixing and stirring tank 70, steam pipe coil 73 is passed through inside mixing and stirring tank 70, it is ensured that the hot environment in whipping process, so as to drop The density of low pitch, reduces stirring resistance, and one group of decelerating through motor thermomechanical components 78 is opened drives one group of 76 turns of agitating shaft respectively It is dynamic, so that drive installation completes the thermal agitation of modified pitch, after the completion of stirring, beaten in one group of helical mixing blade 77 thereon Open the mixing work that baiting valve 79 completes modified pitch.

Claims (6)

1. for producing the sub-material and mixing and stirring system of modified pitch, it is characterised in that it include building stones sorting ingredient sector and Hot material mixes mechanism, and the building stones sorting ingredient sector includes batch mixing stir storehouse(50), building stones screening machine(51), a stone Expect measuring chute(52), No. two building stones measuring chutes(53), No. three building stones measuring chutes(54), No. four building stones measuring chutes(55), one group claim Metering valve(56)And discharge nozzle(57), the batch mixing stir storehouse(50)Top be open funnel-form warehouse, the stone Material screen extension set(51)Frame be fixedly mounted on batch mixing stir storehouse(50)Side, and building stones screening machine(51)One group of discharging opening Positioned at batch mixing stir storehouse(50)Top, a building stones measuring chute(52), No. two building stones measuring chutes(53), No. three building stones meters Measure storehouse(54)With No. four building stones measuring chutes(55)It is respectively and fixedly installed to batch mixing stir storehouse(50)Open top at, described one group Weighing valve(56)It is separately mounted to a building stones measuring chute(52), No. two building stones measuring chutes(53), No. three building stones meterings Storehouse(54)With No. four building stones measuring chutes(55)Exit, the discharge nozzle(57)One end be arranged on batch mixing stir storehouse(50)'s Exit, the building stones sorting ingredient sector includes mixing and stirring tank(70), bitumen feed pipe(71), building stones feed hopper(72)、 Steam pipe coil(73), miberal powder pipe(74), discharge nozzle(75)And agitating device, the mixing and stirring tank(70)Provided with bitumen feed Mouth, the outlet of building stones charging aperture, steam pipe coil entrance, steam pipe coil, miberal powder entrance, modified asphalt outlet and one group of agitating shaft are installed Hole, the bitumen feed pipe(71), building stones feed hopper(72), miberal powder pipe(74)And discharge nozzle(75)Respectively with bitumen feed mouthful, Building stones charging aperture, miberal powder entrance are connected with modified asphalt outlet, and building stones feed hopper(72)Entrance and discharge nozzle(57)Connection, The steam pipe coil(73)Entrance and outlet be each passed through steam pipe coil entrance and steam pipe coil is exported, the agitating device bag Include one group of agitating shaft(76)With one group of helical mixing blade(77), one group of agitating shaft(76)One end pass through bearing block respectively It is movably arranged at one group of agitating shaft mounting hole, and one group of agitating shaft(76)From top to bottom equi-spaced apart interlaced arrangement, described one Group helical mixing blade(77)It is respectively and fixedly installed to one group of agitating shaft(76)On.
2. according to claim(1)The described sub-material and mixing and stirring system that are used to produce modified pitch, it is characterised in that institute State building stones sorting ingredient sector and also have outlet Weighing valve(58), the discharge nozzle(57)One end by exporting Weighing Valve(58)Installed in batch mixing stir storehouse(50)Exit.
3. the sub-material and mixing and stirring system according to claim 1 for being used to produce modified pitch, it is characterised in that described Building stones sorting ingredient sector also has waste material pipe(59)With splicing funnel(60), the waste material pipe(59)It is fixedly mounted on batch mixing stirring Storehouse(50)Side, the waste material pipe(59)Top be provided with splicing funnel(60), and splicing funnel(60)Positioned at building stones screening Machine(51)The lower section of caudal end egress.
4. the sub-material and mixing and stirring system according to claim 1 for being used to produce modified pitch, it is characterised in that described Building stones sorting ingredient sector also has one group of decelerating through motor thermomechanical components(78), one group of decelerating through motor thermomechanical components(78)Power it is defeated Shaft respectively with one group of agitating shaft(76)Transmission is connected.
5. the sub-material and mixing and stirring system according to claim 1 for being used to produce modified pitch, it is characterised in that described Building stones sorting ingredient sector also has baiting valve(79), the discharge nozzle(75)Pass through baiting valve(79)Connection is in mixing and stirring tank (70)Modified asphalt outlet at.
6. the sub-material and mixing and stirring system according to claim 1 for being used to produce modified pitch, it is characterised in that described Mixing and stirring tank(70)It is composited by sandwich construction, mixing and stirring tank(70)Tank skin be followed successively by stainless steel outsourcing from outside to inside Layer(70-1), outer glass layer(70-2), vacuum interlayer(70-3), interior stainless steel layer(70-4)With interior ceramic coating(70- 5).
CN201710571292.8A 2017-07-13 2017-07-13 Sub-material and mixing and stirring system for producing modified pitch Pending CN107165026A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN201710571292.8A CN107165026A (en) 2017-07-13 2017-07-13 Sub-material and mixing and stirring system for producing modified pitch

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Application Number Priority Date Filing Date Title
CN201710571292.8A CN107165026A (en) 2017-07-13 2017-07-13 Sub-material and mixing and stirring system for producing modified pitch

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CN107165026A true CN107165026A (en) 2017-09-15

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Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN107447626A (en) * 2017-07-26 2017-12-08 湖北圣通石化有限公司 For producing the sub-material and mixing and stirring system of modified pitch
CN108130841A (en) * 2017-11-14 2018-06-08 浙江大学 A kind of modified pitch sand agitator
CN110344303A (en) * 2018-04-02 2019-10-18 利越集团有限公司 Petroleum Asphalt Mixture for Road Lower device and method
CN111648203A (en) * 2020-07-06 2020-09-11 宿迁市高速铁路建设发展有限公司 Asphalt waste collecting and treating equipment for road traffic construction
CN112458830A (en) * 2020-12-01 2021-03-09 浙江春天建设有限公司 Grading method of cold-recycling mixture
CN112516908A (en) * 2020-11-20 2021-03-19 南通路桥工程有限公司 Adding device for aggregate in asphalt mixture

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE1802201A1 (en) * 1968-10-10 1970-05-14 Mitteldeutsche Hartstein Ind A Regulating the final temperature of minerals after - heating
CN201330362Y (en) * 2008-12-29 2009-10-21 长安大学 Intermittent warm asphalt stirring equipment
CN101623610A (en) * 2009-08-06 2010-01-13 郝志付 Asphalt mixture stirring device
CN102535636A (en) * 2011-12-14 2012-07-04 郎溪县恒云工程机械有限公司 H-type steel module assembly structure for asphalt mixing plant
KR20130078000A (en) * 2011-12-30 2013-07-10 송진수 Hot silo with heat sources system using carbon fiber

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE1802201A1 (en) * 1968-10-10 1970-05-14 Mitteldeutsche Hartstein Ind A Regulating the final temperature of minerals after - heating
CN201330362Y (en) * 2008-12-29 2009-10-21 长安大学 Intermittent warm asphalt stirring equipment
CN101623610A (en) * 2009-08-06 2010-01-13 郝志付 Asphalt mixture stirring device
CN102535636A (en) * 2011-12-14 2012-07-04 郎溪县恒云工程机械有限公司 H-type steel module assembly structure for asphalt mixing plant
KR20130078000A (en) * 2011-12-30 2013-07-10 송진수 Hot silo with heat sources system using carbon fiber

Cited By (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN107447626A (en) * 2017-07-26 2017-12-08 湖北圣通石化有限公司 For producing the sub-material and mixing and stirring system of modified pitch
CN108130841A (en) * 2017-11-14 2018-06-08 浙江大学 A kind of modified pitch sand agitator
CN110344303A (en) * 2018-04-02 2019-10-18 利越集团有限公司 Petroleum Asphalt Mixture for Road Lower device and method
CN110344303B (en) * 2018-04-02 2021-02-09 利越集团有限公司 Road petroleum asphalt mixture device and method
CN111648203A (en) * 2020-07-06 2020-09-11 宿迁市高速铁路建设发展有限公司 Asphalt waste collecting and treating equipment for road traffic construction
CN112516908A (en) * 2020-11-20 2021-03-19 南通路桥工程有限公司 Adding device for aggregate in asphalt mixture
CN112458830A (en) * 2020-12-01 2021-03-09 浙江春天建设有限公司 Grading method of cold-recycling mixture

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Application publication date: 20170915