CN110747714B - Asphalt mixture stirring device - Google Patents
Asphalt mixture stirring device Download PDFInfo
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- CN110747714B CN110747714B CN201911035721.5A CN201911035721A CN110747714B CN 110747714 B CN110747714 B CN 110747714B CN 201911035721 A CN201911035721 A CN 201911035721A CN 110747714 B CN110747714 B CN 110747714B
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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
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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
- E01C19/104—Mixing by means of movable members in a non-rotating mixing enclosure, e.g. stirrers
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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
Abstract
The invention relates to an asphalt mixture stirring device, which comprises: a primary stirring bin and a secondary stirring bin; a blowing type mineral powder spraying device and a pneumatic type asphalt spraying device as well as a half-bin type rotating stirring device positioned at the lower part are arranged in the primary stirring bin; a double-horizontal-shaft paddle stirring device is arranged in the secondary stirring bin, and a discharge port is formed in the lower end of the secondary stirring bin; the primary stirring bin is supported above the secondary stirring bin by a circular truncated cone-shaped slidable vertical supporting device. The asphalt mixture stirring device aims at solving the engineering problems in the prior art, and aims to realize the efficient stirring of aggregate-asphalt-mineral powder, increase the free motion state and the effective spraying area of mineral aggregate and increase the spraying uniformity of asphalt and mineral powder by changing the stirring form of the asphalt mixture, realize the full-range coverage of discrete mineral aggregate areas, and improve the stirring quality and the stirring efficiency of the asphalt mixture.
Description
Technical Field
The invention relates to the technical field of asphalt mixtures, in particular to an asphalt mixture stirring device.
Background
The asphalt mixture is an important material for road construction, and is composed of three basic materials of aggregate-asphalt-mineral powder, which are effectively mixed to form a road structure layer with excellent performance. However, in the conventional asphalt mixture mixing, the three materials cannot be efficiently mixed to form an optimal stable structure. The main defects are three aspects: firstly, the asphalt is more intensively poured into the mineral aggregate, so that the thickness of the asphalt layer on the surface of the mineral aggregate is uneven, and even the phenomenon of 'block' appears. Secondly, the mineral powder is not uniformly added into the mixture of the asphalt and the mineral aggregate, so that the mineral powder and the asphalt are easy to agglomerate, and thirdly, the movement state of the coarse and fine aggregates is unreasonable, so that the mixture is separated. The three aspects are the root of early damage such as cracks, looseness, pits, large tracks and the like of the asphalt pavement in China.
The existing engineering application shows that the service performance of the pavement is reduced, and even early large-area damage occurs, which is directly caused by low stirring quality of the asphalt mixture. The root of the method is that the raw materials of the asphalt mixture are insufficient in free motion state in the stirring bin, and the adding mode of aggregate, asphalt and mineral powder is unreasonable, so that the production quality of the product is out of control. In the face of the great demand of the national road construction for asphalt mixture, the research and development of a novel stirring device aiming at improving the stirring quality and efficiency of the asphalt mixture is urgent.
Disclosure of Invention
The invention provides an asphalt mixture stirring device, which aims to solve the technical problems in the prior art.
In order to solve the technical problems, the technical scheme of the invention is as follows:
an asphalt mixing device comprising:
once stir the storehouse, once stir the storehouse and include: a blowing type mineral powder spraying device and a pneumatic type asphalt spraying device which are positioned at the upper part, and a semi-bin type rotating stirring device which is positioned at the lower part; a feeding hole is formed in the side surface of the primary stirring bin; the height of the semi-bin type rotary stirring device accounts for 3/7-4/7 of the primary stirring bin, the upper end of the semi-bin type rotary stirring device is provided with a sliding groove, the lower end of the semi-bin type rotary stirring device is provided with a primary discharge hole, the inner wall of the semi-bin type rotary stirring device is provided with a plurality of threaded triangular blades, and the outer wall of the semi-bin type rotary stirring device is provided with an outer wall; the outer wall rotating gear can be driven by a powerful gear engine to rotate;
the top of the secondary stirring bin is connected with a primary discharge port at the lower end of the primary stirring bin; a double-horizontal-shaft paddle stirring device is arranged in the secondary stirring bin, and a discharge port is formed in the lower end of the secondary stirring bin;
the primary stirring bin is supported above the secondary stirring bin by a circular truncated cone-shaped slidable vertical supporting device.
In the above technical solution, the blast-type fine ore injection device includes: the device comprises a blower, a mineral powder bin and an annular circular tube powder channel; the ore powder bin is communicated with the annular circular tube powder channel;
the annular circular tube powder channel is provided with a plurality of U-shaped openings; mineral powder can be blown by wind power and uniformly sprinkled to the spherical curved surface to move mineral materials through the plurality of U-shaped openings.
In the above technical solution, the pneumatic asphalt spraying device includes: an asphalt bin and a pneumatic press; the asphalt bin is connected with a plurality of umbrella-shaped spraying heads; the umbrella-shaped spraying head is positioned in the center of the primary stirring bin;
the fluid asphalt in the asphalt bin can be sprayed out of the umbrella-shaped spraying head under the action of pressure generated by ultrahigh air pressure generated by the air compressor.
In the technical scheme, the inner wall of the semi-bin type rotary stirring device is provided with 6 threaded triangular blades, the interval between every two adjacent threaded triangular blades is 33-36 cm, the threaded triangular blades protrude out of the bin wall by 25-30 cm in vertical height, and the included angle between the length direction of the threaded triangular blades and the horizontal line direction of the bin wall is 30-55 degrees.
In the technical scheme, one surface of the threaded triangular blade and the inner wall of the primary stirring bin form an inclination angle of 40-50 degrees, the surface of the threaded triangular blade is an inwards concave curved surface and is attached with a horizontal bulge, and the other surface of the threaded triangular blade is perpendicular to the inner wall.
In the technical scheme, the double-horizontal-shaft paddle stirring device is provided with two symmetrically arranged rotating shafts, 12-15 stirring arms are arranged at the front and the back of each rotating shaft, and a 10-15 cm left-right overlapped stirring area is arranged; the tail end of each stirring arm is provided with a blade, the distance between the outer side of each blade and the bin wall of the secondary stirring bin is 2-3 cm, and the included angle between the surface of each blade and the horizontal direction is 45-50 degrees.
In the technical scheme, the walls of the primary stirring bin and the secondary stirring bin are made of heat-insulating materials.
The invention has the following beneficial effects:
the asphalt mixture stirring device aims at solving the engineering problems in the prior art, and aims to realize the efficient stirring of aggregate-asphalt-mineral powder, increase the free motion state and the effective spraying area of mineral aggregate and increase the spraying uniformity of asphalt and mineral powder by changing the stirring form of the asphalt mixture, realize the full-range coverage of discrete mineral aggregate areas, and improve the stirring quality and the stirring efficiency of the asphalt mixture.
The asphalt mixture stirring device can obviously improve the stirring quality and the stirring efficiency of the asphalt mixture, and increases the free motion state and the effective spraying area of mineral aggregate in a semi-bin type rotating stirring mode; the central air pressure asphalt spraying device and the blowing type mineral powder spraying device greatly enhance the spraying effect of asphalt and mineral powder; the primary stirring bin and the secondary stirring bin work coordinately, so that the production speed of the asphalt mixture is increased. The asphalt mixture stirring device can lead the asphalt mixture to reach an ideal stirring state by reasonably adding and utilizing all raw materials.
The asphalt mixture stirring device of the invention can realize the following advantages:
1. compared with the traditional mode, the thickness of the oil film for coarse and fine aggregate is more uniform.
2. Compared with the traditional mode, the asphalt mixture stirring device can increase the discreteness of coarse aggregates in the mixture, effectively avoid the segregation of mineral powder, ensure that the proportion of asphalt and the mineral powder is more uniform, more reasonably form asphalt mucilage and greatly reduce the segregation phenomenon of the mixture.
3. Greatly improving the use value of the raw materials of the mixture and obviously improving the production efficiency and road performance of the asphalt mixture.
4. And a powerful basis is provided for scientists to the authenticity and scientificity of the performance determination and evaluation of the asphalt mixture.
5. By using the asphalt mixture stirring device, high-quality and high-efficiency production of the asphalt mixture can be realized, the use value of raw materials of the asphalt mixture is greatly improved, and the road performance of the asphalt mixture is obviously improved.
Drawings
The present invention will be described in further detail with reference to the accompanying drawings and specific embodiments.
FIG. 1 is a schematic representation of the microscopic representation of oil film thickness uniformity.
FIG. 2 is a schematic diagram of the effect analysis of oil film thickness uniformity.
FIG. 3 is a schematic view showing segregation of ore fines.
FIG. 4 is a schematic diagram showing the segregation effect of ore fines.
FIG. 5 is a schematic representation of batch segregation macro-performance.
Fig. 6 is an overall schematic view of the asphalt mixture stirring apparatus.
Fig. 7 is a schematic front view of a half-bin type rotary stirring device.
Fig. 8 is a schematic structural view of a pneumatic asphalt spraying device.
Fig. 9 is a schematic structural view of a blast-type fine ore injection device.
Fig. 10 is a schematic structural view in front perspective of the double horizontal shaft paddle stirring device.
Fig. 11 is a schematic structural view of a truncated cone shaped slidable vertical support means.
Fig. 12 is a schematic top view of a half-bin type rotary stirring device.
Fig. 13 is a schematic top perspective structure view of the double horizontal shaft paddle stirring device.
The reference numerals in the figures denote:
1-blowing type mineral powder spraying device; 2-air pressure type asphalt spraying device; 3-primary stirring bin; 4-a half-bin type rotating stirring device; 5-a truncated cone shaped slidable vertical support means; 6-secondary stirring bin; 7-double horizontal shaft paddle stirring device; 8-a feed inlet; 9-a discharge hole;
11-a blower; 12-a fine ore bin; 13-annular circular tube powder channel; 14-terminal gas outlet; 15-U-shaped opening;
21-an asphalt bin; 22-an air compressor; 23-umbrella sprinkler;
41-a sliding groove; 42-outer wall rotating gear; 43-power gear motor; 44-threaded triangular blades; 45-primary discharge port;
51-a slide; 52-steel frame; 53-I-steel stiffening hoops; 54-a base;
71-a rotating shaft; 72-a stirring arm; 73-blade.
Detailed Description
The present invention will be described in detail with reference to the accompanying drawings.
As shown in fig. 6, the asphalt mixture stirring device provided by the present invention comprises, from top to bottom: a feeding hole 8 for blowing mineral powder into the device 1; the pneumatic asphalt spraying device 2 is attached with an umbrella-shaped spraying head 23; a semi-ellipsoidal primary stirring bin 3; a semi-bin type rotating stirring device 4; a primary stirring bin burner; a truncated cone shaped slidable vertical support means 5; a primary discharge port 45; a secondary stirring bin 6; a double horizontal shaft paddle stirring device 7 and a secondary stirring bin combustor; and a discharge port 9.
The detailed structure and function of the device are described as follows:
and the feed inlet 8 is positioned at the upper left part of the primary stirring bin 3 and is a trapezoidal groove, the inclined plane and the horizontal direction form 40-50 degrees, and the junction of the inclined plane and the primary stirring bin 3 is in arc transition. In order to ensure the smooth falling of the aggregate and avoid the direct impact of the aggregate on the bin bottom of the primary stirring bin 3.
The primary stirring bin 3 is in a semi-ellipsoidal shape, and the lower two thirds of the primary stirring bin is close to a hemisphere. The net height in the bin is 2.6-2.8 m, the charging height is 0.8-1 m, and the volume can reach 7.6-8.2 m3。
As shown in fig. 7 and 12, the half-bin rotary stirring device 4 has a height of 3/7 to 4/7 of the whole primary stirring bin 3, and mainly includes four characteristic parts, a sliding groove 41, a threaded triangular blade 44, an outer wall rotary gear 42, and a power gear motor 43. Wherein the content of the first and second substances,
the upper edge of the half-bin type rotating stirring device 4 is provided with a sliding groove 41 which can provide vertical lifting force for the stirring device and reduce the sliding friction force of the device, and the lower edge is provided with a truncated cone-shaped sliding vertical supporting device 5 which can provide vertical supporting force and reduce the sliding friction force of the device.
The inner wall of the semi-bin type rotating stirring device 4 is provided with 6 groups of inclined threaded triangular blades 44 at intervals of 33-36 cm, the threaded triangular blades 44 protrude out of the bin wall by a vertical height of 25-30 cm, and an included angle between the threaded triangular blades 44 and the horizontal line of the bin wall along the length direction is 30-55 degrees. The inclined plane of the threaded triangular blade 44 forms an inclination angle of 40-50 degrees with the inner wall of the primary stirring bin 3, the surface of the threaded triangular blade 44 is a concave curved surface and is attached with a horizontal bulge, and the other surface of the threaded triangular blade 44 is vertical to the inner wall. Under the half storehouse body rotation of half storehouse formula rotation agitating unit 4, the three-edged blade of screw thread 44 of slope not only provides centrifugal force for the mineral aggregate, can also pass through rotatory three-edged blade of screw thread 44 slip to top and free fall with bottom mineral aggregate, and the circulation is reciprocal, realizes the whole even thickness of mineral aggregate, is the spherical surface shape large tracts of land and rolls, and very big degree has increased the free motion state and the effective area that sprays of mineral aggregate.
Four strong gear motors 43 are arranged at four corners of the half-bin type rotating and stirring device 4, and can efficiently cooperate with the convex gear tracks on the outer wall of the half-bin type rotating and stirring device 4 to provide rotating speed, so that the rotating speed reaches 50-60 r/min.
As shown in fig. 11, the truncated cone-shaped slidable vertical supporting means 5 serves to vertically support and reinforce while allowing the half-bin type rotary stirring device 4 to rotate. The truncated cone-shaped slidable vertical support device 5 comprises a slideway 51 arranged at the upper end, a steel frame 52 for supporting the slideway 51, an I-shaped steel stiffening hoop 53 positioned at the periphery of the steel frame 52, and a base 54 positioned at the lower end of the steel frame 52.
As shown in fig. 8, the pneumatic asphalt spraying apparatus 2 includes: an asphalt bin 21 and an air compressor 22; the asphalt bin 21 is connected with a plurality of umbrella-shaped spraying heads 23; the pneumatic asphalt spraying device 2 can drive the fluid asphalt in the asphalt bin 21 to be sprayed out through the umbrella-shaped spraying head 23 by using the pressure generated by the ultrahigh air pressure provided by the air pressure device 22. Wherein, the umbrella-shaped sprinkler head 23 is positioned at the center of the primary stirring bin 3. The pneumatic asphalt spraying device 2 is longitudinally provided with four groups of umbrella-shaped spraying heads 23, wherein the three groups of umbrella-shaped spraying heads 23 at the upper part are responsible for the spraying range of 120 degrees, and the other umbrella-shaped spraying head 23 is arranged below the three groups of umbrella-shaped spraying heads 23. The pitch spraying speed of the whole pneumatic pitch spraying device 2 is set to be 75-90 kg/s. The spraying range of the whole air pressure type asphalt spraying device 2 is matched with the spherical surface contact surface of the mineral aggregate, the spraying area is large, and the spraying mode is uniform.
As shown in fig. 9, the blast-type fine ore injection device 1 includes a blast blower 11, a fine ore bin 12, and an annular circular tube powder duct 13, wherein the fine ore bin 12 is directly connected to the annular circular tube powder duct 13. A plurality of U-shaped openings 15 are formed below the annular circular tube powder channel 13, so that mineral powder is blown by wind power and uniformly sprinkled to the spherical curved surface motion mineral material through the lower U-shaped openings 15. The tail end of the annular circular tube powder channel 13 is provided with a tail end air outlet 14. The blast type mineral powder spraying device 1 ensures that the added mineral powder has discreteness and is not easy to generate agglomeration. The mineral powder spraying speed of the whole blowing type mineral powder spraying device 1 is set to be 70-85 kg/s.
And a secondary stirring bin 6 for taking a traditional double-horizontal-shaft stirrer. The bin body of the secondary stirring bin 6 is overlapped in a double-cylinder shape, the radius of the cylinder is 0.7-0.8 m, the length of the cylinder is 3.4-3.5 m, and a double-horizontal-shaft paddle stirring device 7 is arranged in the bin body. Considering the influence of the filling rate and the rotating speed on the separation of the mixture, the rotating speed of the double-horizontal-shaft blade stirring device 7 is 75r/min, and the filling rate is 50-55%.
As shown in FIGS. 10 and 13, the double horizontal shaft paddle stirring device 7 is provided with two rotating shafts 71, 12-15 stirring arms 72 are arranged at the front and the back of each rotating shaft 71, the two rotating shafts are symmetrically arranged, and an overlapped stirring area of about 10-15 cm is arranged, so that the mixture can generate a boiling effect more easily. The tail end of each stirring arm 72 is provided with a blade 73, the distance between the outer side of each blade 73 and the bin wall is 2-3 cm, and the included angle between the surface of each blade 73 and the horizontal direction is 45-50 degrees. Through double-shaft reverse rotation and the guide rotation of the blades 73 driven by the stirring arms 72 at the head end and the tail end, the asphalt mixture moves clockwise along the storage channel, and the transverse and vertical free motion states of the asphalt mixture are increased.
The walls of the primary stirring bin 3 and the secondary stirring bin 6 are made of good heat insulation materials, and are respectively provided with a traditional small-sized burner, a primary stirring bin burner and a secondary stirring bin burner which are respectively controlled by a control system in a unified manner, and the details are omitted here.
The asphalt mixture stirring device provided by the invention is used for preparing the asphalt mixture in a novel stirring way, and comprises the following steps:
step i: according to the mix proportion design, required mineral powder is placed into a mineral powder bin, asphalt is added into an asphalt bin, and the dosage of the asphalt and the mineral powder is preset in a control system.
Step ii: the preheated mineral aggregate is slowly added into the primary stirring bin 3 at the speed of about 350t/h, the semi-bin type rotary stirring device 4 is opened, and the preheated mineral aggregate is driven by the inclined thread triangular blades 44 on the inner wall and the surface of the inner wall under the strong power support of the four-engine linkage rotating device to roll along the wall with uniform thickness.
Step iii: after the semi-bin type rotary stirring device 4 is opened for 8s, the control system automatically opens the central air pressure type asphalt spraying device 2 to spray large-area mineral aggregate in all areas. The spraying control system controls the spraying time to be 9-11 s by adjusting the spraying speed, the spraying speed is 75-90 kg/s, and then the spraying control system is closed.
Step iv: and starting the blowing type mineral powder spraying device 1, controlling the adding time to be 9-10 s and the adding speed to be 70-85 kg/s, and then closing.
And step v: after stirring for 15 ~ 18s in succession, control system control half storehouse formula rotates agitating unit 4 slowing down speed, opens below discharge gate 9, shifts the bituminous mixture to secondary stirring storehouse 6 and continues to stir 20 ~ 25s (specifically see stirring object requirement), and two stirring storehouse temperatures are reacted by control system, utilize small-size combustor regulation and control.
Step vi: after 3 ejection of compact in stirring storehouse, the 4 rotational speed of stirring device are rotated to half storehouse formula to the system can resume automatically, repeats above-mentioned ii to v steps until the work is finished, and whole equipment expects that production efficiency can reach 270 ~ 300t/h, and ejection of compact temperature 120 ~ 160 ℃ (adjustable).
The asphalt mixture stirring device can realize high-quality and high-efficiency production of the asphalt mixture.
In the quality aspect: firstly, the semi-bin type asphalt mixture rotating and stirring device is used for realizing that the whole mineral aggregate is in a spherical curved surface shape and rolls in a large area. Not only greatly increasing the free motion state of the mineral aggregate, but also exponentially increasing the effective spraying area of the asphalt; secondly, the advantages of large spraying range, uniform spraying and the like of the central air pressure spraying device and the blast type mineral powder spraying device are utilized to supplement each other, and an ideal asphalt mixture stirring state is achieved.
In the aspect of efficiency: the primary processing of the primary rotating stirring device makes the uniformity of the asphalt mixture get qualitative leap. And the secondary stirring device is matched to reprocess the product, so that the production rate of the two stirring machines is skillfully realized. The bottleneck that the traditional stirrer is uneven in mixing and slow in production speed is broken through.
In order to verify the necessity of developing the technology of the present invention, the applicant respectively performs experimental analysis on three aspects of oil film thickness, asphalt cement and aggregate segregation from a microscopic angle to a macroscopic angle for the asphalt mixture of the present invention and the conventional plant-mixed asphalt mixture:
1) uniformity of oil film thickness
The thickness of the asphalt film in the asphalt mixture is generally 6-15 mu m, the thickness of the asphalt film of aggregates with different particle sizes is different, and particularly, the asphalt film on the edge angle is thinner, even no asphalt film is wrapped. This results in a mix non-uniformity that macroscopically appears as a whitish color in individual areas of the mix and a black and bright surface in individual areas. The microscopic appearance is shown in FIG. 1. The asphalt mixture stirring device utilizes the air pressure type asphalt spraying device to effectively contact the asphalt with the large-surface-area spherical curved surface mineral aggregate in a spraying mode, and the thickness uniformity of the oil film on the surface of the mineral aggregate is greatly improved. As shown in fig. 2, according to the relationship between the stability, the dynamic stability and the average asphalt film thickness, the stirring test piece of the present invention and the conventional stirring test piece were simulated and manufactured by taking the free motion state of the mineral aggregate as a single variable through an indoor test, and the stability and the dynamic stability were measured and averaged. The stability of the stirring test piece reaches the peak value earlier than that of the traditional stirring test piece under the condition of the same asphalt dosage. And compared with the traditional stirring test piece, the stirring test piece has the advantage that the oil film uniformity is increased by about 13.2-17.8%.
2) Segregation of mineral powder
The production of the asphalt mixture adopts a blast type mineral powder spraying device, and replaces the traditional mode of intensively pouring mineral powder in a spraying mode, thereby effectively avoiding the agglomeration phenomenon, as shown in figure 3. In order to verify the necessity of the form, the applicant carries out indoor test simulation to manufacture two asphalt mucilages of a mineral powder spraying type and a centralized adding type, sets a plurality of groups of parallel tests according to different powder-to-colloid ratios at the temperature of 15 ℃ below zero, and carries out quantitative analysis on the low-temperature bonding strength. As shown in FIG. 4, the results show that the stirring method of the invention can make the mineral powder distribution in the asphalt cement more uniform, and the bonding strength is improved by 26.4-34.8% compared with the performance of the traditional asphalt cement.
3) Segregation of the mixture
As shown in fig. 5, the traditional plant-mixed asphalt mixture is not sufficiently mixed, so that the coarse and fine aggregates are not uniformly distributed, i.e. segregation phenomenon is easily generated, and the actual production effect is seriously inconsistent with the initial gradation design. The asphalt mixture stirring device of the invention aims to solve the problem that: utilize primary mixing device, rotatory and the horizontal arch of blade provides frictional force through spiral triangular blade, make full use of centrifugal force and blade angle of inclination, spiral lifting the mixture to the top and rely on self gravity to fall to the bottom. The circulating reciprocating motion obviously increases the free motion state of the asphalt mixture in the horizontal and vertical directions. Secondly, the uniformity of the product is upgraded for the second time by utilizing a secondary traditional double horizontal shaft paddle stirring device. By means of the double-shaft reversal, the mixture is subjected to a boiling effect in the compartment. Meanwhile, the mixing machine moves clockwise along the bin channel under the pushing of the blades, so that the mixing quality of the mixed materials is improved to a great extent.
To verify the necessity of this format, the applicant simulated 10 each of the conventional stirred marshall test piece and the new stirred marshall test piece via laboratory tests. The non-uniform distribution coefficient of the particles in the section and the effect of the non-uniform distribution coefficient on the variability of the road performance index are measured. Through determination, the uneven distribution coefficient of the traditional stirring test piece is large and mostly concentrated in the range of 10% -14%, and only reaches 75% -83% of the stirring test piece. The traditional stirring test piece has poor uniformity and great variability of road performance indexes. On the contrary, the stirring test piece of the invention has better uniformity and smaller variability of the pavement performance index.
The asphalt mixture stirring device can obviously improve the stirring quality and the stirring efficiency of the asphalt mixture. The whole uniform thickness and large-area rolling of the mineral aggregate are realized through the semi-bin type asphalt mixture rotating and stirring device, and the free motion state and the effective spraying area of the mineral aggregate are increased; the advantages of large spraying range, uniform spraying and the like of the central air pressure spraying device and the blowing type mineral powder spraying device are utilized to supplement each other, an ideal asphalt mixture stirring state is achieved, and the asphalt mixture stirring quality and the road performance are obviously improved.
It should be understood that the above examples are only for clarity of illustration and are not intended to limit the embodiments. Other variations and modifications will be apparent to persons skilled in the art in light of the above description. And are neither required nor exhaustive of all embodiments. And obvious variations or modifications therefrom are within the scope of the invention.
Claims (5)
1. An asphalt mixture stirring device, characterized by comprising:
once stir storehouse (3), once stir storehouse (3) includes: a blowing type mineral powder spraying device (1) and a pneumatic type asphalt spraying device (2) which are positioned at the upper part, and a semi-bin type rotating stirring device (4) which is positioned at the lower part; a feeding hole (8) is formed in the side surface of the primary stirring bin (3); the height of the half-bin type rotary stirring device (4) accounts for 3/7-4/7 of the primary stirring bin (3), the upper end of the half-bin type rotary stirring device (4) is provided with a sliding groove (41), the lower end of the half-bin type rotary stirring device is provided with a primary discharge hole (45), the inner wall of the half-bin type rotary stirring device is provided with a plurality of threaded triangular blades (44), and the outer wall of the half-bin type rotary stirring device is provided with an outer wall rotating gear (; the outer wall rotating gear (42) can be driven by a powerful gear motor (43) to rotate;
the top of the secondary stirring bin (6) is connected with a primary discharge hole (45) at the lower end of the primary stirring bin (3); a double-horizontal-shaft paddle stirring device (7) is arranged in the secondary stirring bin (6), and a discharge hole (9) is formed in the lower end of the secondary stirring bin;
the primary stirring bin (3) is supported above the secondary stirring bin (6) by a truncated cone-shaped slidable vertical supporting device (5);
the blast type mineral powder spraying device (1) comprises: the device comprises a blower (11), a mineral powder bin (12) and an annular circular tube powder channel (13); the ore powder bin (12) is communicated with the annular circular tube powder channel (13);
a plurality of U-shaped openings (15) are formed in the annular circular tube powder channel (13); mineral powder can be blown by wind power and uniformly sprinkled to the spherical curved surface to move mineral materials through the plurality of U-shaped openings (15);
the pneumatic asphalt spraying device (2) comprises: an asphalt bin (21) and an air pressure device (22); the asphalt bin (21) is connected with a plurality of umbrella-shaped spraying heads (23); the umbrella-shaped sprinkler head (23) is positioned in the center of the primary stirring bin (3);
the fluid asphalt in the asphalt bin (21) can be sprayed out from the umbrella-shaped spraying head (23) under the action of the ultrahigh air pressure generated by the air compressor (22).
2. The asphalt mixture stirring device according to claim 1, wherein the inner wall of the semi-bin type rotary stirring device (4) is provided with 6 threaded triangular blades (44), the interval between the adjacent threaded triangular blades (44) is 33-36 cm, the threaded triangular blades (44) protrude the bin wall by a vertical height of 25-30 cm, and the included angle between the length direction and the horizontal line direction of the bin wall is 30-55 degrees.
3. The asphalt mixture stirring device according to claim 2, wherein one surface of the threaded triangular blade (44) forms an inclination angle of 40-50 degrees with the inner wall of the primary stirring bin (3), the surface is an inward concave curved surface and is attached with a horizontal protrusion, and the other surface of the threaded triangular blade (44) is perpendicular to the inner wall.
4. The asphalt mixture stirring device according to claim 1, wherein the double horizontal shaft paddle stirring device (7) is provided with two symmetrically arranged rotating shafts (71), 12-15 stirring arms (72) are arranged at the front and the back of each rotating shaft (71), and an overlapped stirring area of 10-15 cm is arranged; the tail end of each stirring arm (72) is provided with a blade (73), the distance between the outer side of each blade (73) and the bin wall of the secondary stirring bin (6) is 2-3 cm, and the included angle between the surface of each blade (73) and the horizontal direction is 45-50 degrees.
5. The asphalt mixture stirring device according to claim 1, wherein the walls of the primary stirring bin (3) and the secondary stirring bin (6) are made of heat-insulating materials.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201911035721.5A CN110747714B (en) | 2019-10-29 | 2019-10-29 | Asphalt mixture stirring device |
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| CN110747714B true CN110747714B (en) | 2021-01-22 |
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| CN111778810B (en) * | 2020-06-23 | 2022-04-01 | 苏州东振路桥工程有限公司 | Mixing method of hot-mixed asphalt mixture |
| CN113214662B (en) * | 2021-05-11 | 2022-09-23 | 中交第三公路工程局有限公司 | Environment-friendly asphalt material and preparation process thereof |
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| GB818384A (en) * | 1955-09-09 | 1959-08-19 | Barber Greene Co | Improvements in and relating to mixing apparatus |
| CN2068955U (en) * | 1990-02-14 | 1991-01-09 | 湖南省衡阳公路总段机械修配厂 | Pneumatic conveying apparatus for mineral powders |
| CN203639784U (en) * | 2013-12-23 | 2014-06-11 | 南京英达公路养护车制造有限公司 | Drum-type asphalt mixture bunker |
| CN204235704U (en) * | 2014-11-28 | 2015-04-01 | 时建华 | Build concrete mixer |
| CN104695308B (en) * | 2015-03-19 | 2016-06-15 | 山东省路桥集团有限公司 | Asphalt pavement on-site heat recoveryremixer twin-tub agitator kettle |
| CN109500996A (en) * | 2017-09-15 | 2019-03-22 | 河南三和水工机械有限公司 | The stirring means of concrete batch plant and concrete |
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