A pretreatment device for improving the dispersibility of synthetic fibers in asphalt mixtures

Abstract

A pretreatment device for improving the dispersion of synthetic fibers in asphalt mixtures, comprising a vibrating screen assembly, an ion wind generator, and a heater; the pretreatment device is arranged above the aggregate mixing device. When the aggregate mixing device is working, synthetic fibers are put into the vibrating screen assembly, and the vibrating screen assembly vibrates to gradually screen out and drop the synthetic fibers from the vibrating screen assembly; the heater is powered on to heat the air to form an upward flowing hot air current; when the hot air current passes through the ion wind generator, an ion wind flowing upward with electricity is formed; when the synthetic fibers are screened out and dropped from the vibrating screen assembly, the upward flowing ion wind extends the falling time of the synthetic fibers, enabling the bundled synthetic fibers to be naturally dispersed under the action of the ion wind; at the same time, after the bundled synthetic fibers come into contact with the ion wind flowing upward with electricity, the synthetic fiber bundles are charged, and the charged synthetic fiber bundles repel each other with the same sex, prompting the bundled synthetic fibers to be further dispersed, thereby improving the dispersion of the synthetic fibers in the aggregates.

Description

Technical Field

[0001] The invention relates to the technical field of highway asphalt pavement construction, and in particular to a pretreatment device for improving the dispersibility of synthetic fibers in asphalt mixtures. Background Art

[0002] As the asphalt pavement of highways increases in service time, various forms of cracks, looseness, rutting and other defects will gradually appear on the asphalt pavement, thus affecting the normal use of the highway, and even affecting the driving safety of the highway in serious cases. Therefore, how to delay the occurrence and development of various asphalt pavement defects and extend the service life of the asphalt pavement of highways has been the main research topic for highway design, construction and maintenance companies.

[0003] Adding fibers to asphalt mixtures and applying them to the repair, renovation and maintenance of newly built highway pavements or in-use highway pavements can form a three-dimensional network stable structure composed of fibers in the highway asphalt mixture pavement, so that the highway asphalt mixture pavement has higher high temperature stability, fatigue resistance and resistance to aging and cracking, and delays or postpones the occurrence and development of asphalt pavement cracks, looseness, rutting and other diseases, thereby greatly extending the service life and maintenance cycle of highway asphalt pavements and significantly reducing the maintenance cost of highways.

[0004] At present, the types of fibers used in asphalt mixtures mainly include natural fibers, mineral fibers and synthetic fibers; among them, synthetic fibers have the characteristics of high tensile strength, toughness, UV resistance and good aging resistance, and are increasingly used in asphalt mixtures; but synthetic fibers are mostly in clustered bundles. During the mixing and stirring process, bundles of synthetic fibers are prone to agglomeration, which seriously affects the dispersion of synthetic fibers in asphalt mixtures, thereby affecting the comprehensive mechanical properties of fiber asphalt mixtures.

[0005] The Chinese invention patent with application number 202411811425.0 discloses a polyethylene / aramid composite fiber asphalt mixture and its preparation method and application. The coarse aggregate and aramid composite fiber in the asphalt mixture are divided into several portions, and the dispersion of the aramid composite fiber in the asphalt mixture is improved by adding and stirring several portions of coarse aggregate and aramid composite fiber multiple times; however, this method has the problem of complex mixing process, and the maximum dispersion of aramid composite fiber in the asphalt mixture can only reach 85.5%; therefore, how to reduce the complexity of the mixing process of synthetic fiber added to the asphalt mixture, reduce the production difficulty of synthetic fiber asphalt mixture, and further improve the dispersion of synthetic fiber in asphalt mixture, is a technical problem that needs to be solved in the promotion and application of synthetic fiber asphalt mixture, which has important practical significance for extending the service life of highway asphalt pavement and reducing the maintenance cost of kilometer asphalt pavement. Summary of the invention

[0006] In order to overcome the deficiencies in the background art, the present invention discloses a pretreatment device for improving the dispersibility of synthetic fibers in asphalt mixtures, overcoming the deficiencies of the prior art, further improving the dispersibility of synthetic fibers in asphalt mixtures, and at the same time solving the technical problem of the complex production process of synthetic fiber asphalt mixtures.

[0007] To achieve the above-mentioned invention purpose, the present invention adopts the following technical solutions: It includes a vibrating screen assembly, and the vibrating screen assembly is arranged on the upper part of the aggregate mixing device; when the aggregate mixing device is working, synthetic fibers are put into the vibrating screen assembly, and the vibrating screen assembly vibrates, so that the synthetic fibers are gradually screened out from the vibrating screen assembly, and the air resistance is used to naturally disperse the bundled synthetic fibers, which fall into the aggregate mixing device and are stirred together with the aggregates, improving the dispersibility of the synthetic fibers in the aggregates.

[0008] Furthermore, it also includes an ion wind generator and a heater. The vibrating screen assembly is fixedly arranged on the upper part of the ion wind generator, and the heater is fixedly arranged on the lower part of the ion wind generator; when the heater is powered on and generates heat, hot air flow that flows upward is formed. When the hot air flow passes through the ion wind generator, an ion wind that flows upward and is charged is formed; after the synthetic fibers are gradually screened out from the vibrating screen assembly, the ion wind that flows upward increases the resistance of the synthetic fibers to fall downward, prolongs the falling time of the synthetic fibers, and makes the dispersed state of the bundled synthetic fibers better; at the same time, after the bundled synthetic fibers come into contact with the ion wind that flows upward and is charged, the synthetic fiber bundles are charged, and the charged synthetic fiber bundles repel each other with the same sex, prompting the bundled synthetic fibers to separate from each other, further improving the dispersibility of the synthetic fibers in the aggregates.

[0009] Furthermore, the vibrating screen assembly includes a vibrating screen, a bracket, and an electric vibrator; the vibrating screen includes a vibrating screen frame and a vibrating screen mesh, and the vibrating screen mesh is fixedly arranged on the lower part of the vibrating screen frame, and the aperture of the vibrating screen mesh is smaller than the length of the synthetic fibers; the vibrating screen is fixedly arranged on the upper part of the ion wind generator through the bracket; the electric vibrator is fixedly arranged on the outside of the vibrating screen frame; the fixed position of the electric vibrator corresponds to the bracket.

[0010] Furthermore, an inner ring electrode and an outer ring electrode are coaxially arranged in the ion wind generator. Inner ring electrode through holes are arrayed on the inner ring electrode, and a number of corona discharge heads are fixedly arrayed on the inner side of the outer ring electrode. The corona discharge heads pass through the inner ring electrode through holes and extend into the inner cavity of the inner ring electrode; when a high-voltage direct current is applied between the inner ring electrode and the outer ring electrode, corona is generated around the corona discharge heads; when the upward flowing hot air flows through the corona around the corona discharge heads, the upward flowing hot air is formed into an upward flowing ion wind.

[0011] Further, an insulating ring cylinder is provided between the inner ring electrode and the outer ring electrode; an inner ring cylinder is provided inside the inner ring electrode; an outer ring cylinder is provided outside the outer ring electrode; several inner ring cylinder spiral grooves are provided inside the inner ring cylinder, and several inner ring cylinder through holes are provided at the bottom of the inner ring cylinder spiral grooves, and the corona generating head is arranged in the inner ring cylinder through holes.

[0012] Further, the inner ring cylinder, the insulating ring cylinder, the outer ring cylinder, and the bottom plate are all made of insulating materials.

[0013] Further, the inner ring electrode, the outer ring electrode, and the corona generating head are all made of conductive metal materials; the inner ring electrode and the outer ring electrode are plate-shaped and are bent into a cylindrical shape.

[0014] Further, the inner ring electrode and the outer ring electrode are led out through an electrode wire assembly; the electrode wire assembly includes a wire, a contactor, and a contactor compression bolt, and the contactor compression bolt is made of insulating material; the contactor is welded to the end of the wire, the contactor compression bolt is sleeved on the wire, and the contactor is compressed against the outer side surface of the inner ring electrode or the outer ring electrode through the contactor compression bolt.

[0015] Further, the vibrating screen assembly is fixedly arranged on the upper part of the ion wind generator through a feeder; several feeder spiral grooves are provided inside the feeder; the spiral direction of the feeder spiral grooves is opposite to the spiral direction of the inner ring cylinder spiral grooves.

[0016] Further, the heater includes a heating tube and a heat insulation sleeve, the heating tube is bent into an S shape, and the heat insulation sleeve is arranged at the leading-out end of the heating tube; the heater is fixedly arranged at the lower part of the ion wind generator through the bottom plate.

[0017] Due to the adoption of the above-mentioned technical solutions, the present invention has the following beneficial effects: A pretreatment device for improving the dispersion of synthetic fibers in asphalt mixture disclosed by the present invention includes a vibrating screen assembly, an ion wind generator, and a heater. The vibrating screen assembly is fixedly arranged on the upper part of the ion wind generator, and the heater is fixedly arranged at the lower part of the ion wind generator; the pretreatment device is arranged on the upper part of the aggregate mixing device. When the aggregate mixing device works, synthetic fibers are put into the vibrating screen assembly, and the vibrating screen assembly vibrates, so that the synthetic fibers are gradually screened out and fall; the heater is powered on to heat the air to form an upward flowing hot air flow. When the hot air flow passes through the ion wind generator, an ion wind flowing upward with electricity is formed; when the synthetic fibers are screened out and fall from the vibrating screen assembly, the upward flowing ion wind prolongs the falling time of the synthetic fibers, so that the bundled synthetic fibers are naturally dispersed under the action of the ion wind; at the same time, after the bundled synthetic fibers contact the ion wind flowing upward with electricity, the synthetic fiber bundles are charged, and the charged synthetic fiber bundles repel each other with the same sex, prompting the bundled synthetic fibers to be further dispersed, thereby improving the dispersion of the synthetic fibers in the aggregate. Description of the Drawings

[0018] Figure 1It is a schematic diagram of the appearance of the vibrating screen assembly;

[0019] Figure 2 It is a schematic diagram of the appearance of the pretreatment device;

[0020] Figure 3 It is a schematic diagram of the structural decomposition of the pretreatment device;

[0021] Figure 4 It is a schematic diagram of the sectional structure of the pretreatment device;

[0022] Figure 5 It is for Figure 4 The enlarged schematic diagram of the partial A;

[0023] Figure 6 It is a schematic diagram of the appearance of the feeder;

[0024] Figure 7 It is a schematic diagram of the structural decomposition of the ion wind generator;

[0025] Figure 8 It is a schematic diagram of the appearance of the inner ring cylinder;

[0026] Figure 9 It is a schematic diagram of the appearance of the inner ring electrode;

[0027] Figure 10 It is a schematic diagram of the appearance of the insulating ring cylinder;

[0028] Figure 11 It is a schematic diagram of the appearance of the outer ring electrode;

[0029] Figure 12 It is a schematic diagram of the appearance of the outer ring cylinder;

[0030] Figure 13 It is a schematic diagram of the appearance of the electrode wire assembly;

[0031] Figure 14 It is a schematic diagram of the appearance of the heater;

[0032] Figure 15 It is a schematic diagram of the appearance of the bottom plate.

[0033] In the figure: 1. Vibrating screen assembly; 1.1 Vibrating screen; 1.1.1 Vibrating screen frame; 1.1.2 Vibrating screen mesh; 1.2 Support; 1.3 Electric vibrator; 2. Ion wind generator; 2.1 Inner ring cylinder; 2.1.1 Inner ring cylinder spiral groove; 2.1.2 Inner ring cylinder through hole; 2.2 Inner ring electrode; 2.2.1 Inner ring electrode through hole; 2.3 Insulating ring cylinder; 2.3.1 Insulating ring cylinder through hole; 2.3.2 Insulating ring cylinder wire through hole; 2.4 Outer ring electrode; 2.4.1 Inner ring electrode wire avoidance hole; 2.4.2 Corona generating head; 2.5 Outer ring cylinder; 2.5.1 Electrode wire mounting hole; 2.5.2 Heater fixing hole A; 2.6 Electrode wire assembly; 2.6.1 Wire; 2.6.2 Contactor; 2.6.3 Contactor compression bolt; 2.7 Insulating glue; 3. Heater; 3.1 Heating pipe; 3.2 Heat insulation sleeve; 4. Feeder; 4.1 Feeder spiral groove; 5. Bottom plate; 5.1 Heater fixing hole B. Detailed implementation mode

[0034] The present invention can be explained in detail through the following embodiments, and the purpose of disclosing the present invention is to protect all technical improvements within the scope of the present invention.

[0035] Embodiment 1. Refer to the attached Figure 1 :

[0036] A pretreatment device for improving the dispersion of synthetic fibers in asphalt mixture, comprising a vibrating screen assembly 1, and the vibrating screen assembly 1 is arranged on the upper part of the aggregate mixing device; the vibrating screen assembly 1 includes a vibrating screen 1.1, a support 1.2, and an electric vibrator 1.3; the vibrating screen 1.1 includes a vibrating screen frame 1.1.1 and a vibrating screen mesh 1.1.2, and the vibrating screen mesh 1.1.2 is a fine wire mesh of warp and weft interweaving, fixedly arranged at the lower part of the vibrating screen frame 1.1.1, and the aperture of the vibrating screen mesh 1.1.2 is less than the length of the synthetic fiber by 3-4 mm. For example, when the length of the synthetic fiber is 19 mm, the aperture of the vibrating screen mesh 1.1.2 is 15-16 mm; the vibrating screen 1.1 is fixedly arranged on the upper part of the mixing device through four "zigzag" supports 1.2, the upper end of the support 1.2 is fixedly arranged at the bottom of the vibrating screen frame 1.1.1 by welding, and the lower end of the support 1.2 is arranged on the upper part of the mixing device by bolt connection; there are two electric vibrators 1.3, which are respectively fixedly arranged on the outside of the vibrating screen frame 1.1.1 and correspond to two adjacent supports 1.2;

[0037] When the aggregate mixing device is working, the aggregate is placed into the mixing device for stirring. The synthetic fiber to be mixed and added to the aggregate is placed in the vibrating screen 1.1. Since the aperture of the vibrating screen mesh 1.1.2 is smaller than the length of the synthetic fiber, the synthetic fiber will be placed horizontally on the vibrating screen mesh 1.1.2 and will not directly fall into the aggregate mixing device through the vibrating screen mesh 1.1.2. When the two electric vibrators 1.3 are powered on and vibrate, they force the vibrating screen 1.1 to vibrate in two directions, gradually vibrating and dispersing some of the bundled synthetic fibers. When the synthetic fiber (or synthetic fiber bundle) is vibrating in two directions, it will displace on the vibrating screen mesh 1.1.2. When one end of the synthetic fiber (or synthetic fiber bundle) is supported on the fine steel wire of the vibrating screen mesh 1.1.2 and the other end is mostly suspended, the synthetic fiber (or synthetic fiber bundle) will change from a horizontal state to a nearly vertical state and be continuously screened out from the vibrating screen 1.1 under the vibration action, falling into the aggregate mixing device and stirring with the aggregate. The synthetic fiber bundle composed of a single fiber or only a few fibers will swing and slowly fall in a nearly horizontal state, while the larger synthetic fiber bundle will encounter air resistance in a nearly vertical state at the initial stage of the falling process. The air resistance will cause the synthetic fiber bundle to naturally disperse into a state of a synthetic fiber bundle composed of a single fiber or only a few fibers, and then swing and slowly fall in a nearly horizontal state, thus solving the problem that the bundled synthetic fiber is prone to agglomeration when directly added to the aggregate and improving the dispersibility of the synthetic fiber in the aggregate.

[0038] Example 2, see the attached instructions Figures 2 - 4 :

[0039] In this embodiment, it further includes an ion wind generator 2, a heater 3, a feeder 4, and a bottom plate 5. The vibrating screen assembly 1 is fixedly arranged above the ion wind generator 2 through the feeder 4, and the heater 3 is fixedly arranged below the ion wind generator 2 through the bottom plate 5. When the pretreatment device of this embodiment is working, it is fixedly arranged above the aggregate mixing device;

[0040] See the attached instructions Figure 7 : The ion wind generator 2 includes an inner ring cylinder 2.1, an inner ring electrode 2.2, an insulating ring cylinder 2.3, an outer ring electrode 2.4, an outer ring cylinder 2.5, and an electrode wire assembly 2.6. Among them, the inner ring cylinder 2.1, the inner ring electrode 2.2, the insulating ring cylinder 2.3, the outer ring electrode 2.4, and the outer ring cylinder 2.5 are all in a ring cylinder structure and are nested in sequence to form a concentric ring structure; see the attached instructions Figure 5 , and an insulating glue 2.7 is further arranged below the inner ring electrode 2.2 and the outer ring electrode 2.4;

[0041] See the attached instructions Figure 8: The inner ring cylinder 2.1 is made of insulating bakelite or insulating fiberglass tube, and six left-handed inner ring cylinder spiral grooves 2.1.1 are provided on the inner wall. A number of penetrating inner ring cylinder through holes 2.1.2 are provided at the bottom of the inner ring cylinder spiral grooves 2.1.1; see the attached drawings of the specification Figure 9 : The inner ring electrode 2.2 is made of thin copper sheet or thin stainless steel sheet, and is formed into a cylindrical structure by bending; a number of inner ring electrode through holes 2.2.1 are arrayed on the inner ring electrode 2.2, and the positions of the inner ring electrode through holes 2.2.1 correspond to those of the inner ring cylinder through holes 2.1.2; see the attached drawings of the specification Figure 10 : The insulating ring cylinder 2.3 is made of insulating bakelite or insulating fiberglass tube, and a number of insulating ring cylinder through holes 2.3.1 are arrayed on the tube wall. The positions of the insulating ring cylinder through holes 2.3.1 correspond to those of the inner ring electrode through holes 2.2.1; in addition, an insulating ring cylinder wire through hole 2.3.2 is also provided on the insulating ring cylinder 2.3, and this hole is used for the installation of the electrode wire assembly 2.6 in contact with the inner ring electrode 2.2; see the attached drawings of the specification Figure 11 : The outer ring electrode 2.4 is made of thin copper sheet or thin stainless steel sheet (it is easy to bend and install when using thin copper sheet), and is formed into a cylindrical structure by bending; a number of corona generating heads 2.4.2 made of copper are arrayed and welded on the inner side of the outer ring electrode 2.4, and the outer end part thereof is in a sharp cone shape. The positions of the corona generating heads 2.4.2 correspond to those of the insulating ring cylinder through holes 2.3.1; in addition, an inner ring electrode wire avoiding hole 2.4.1 is also provided at the lower part of the outer ring electrode 2.4, and this hole is used to prevent high-voltage breakdown discharge between the electrode wire assembly 2.6 and the outer ring electrode 2.4 when the electrode wire assembly 2.6 in contact with the inner ring electrode 2.2 is installed; see the attached drawings of the specification Figure 12 : The outer ring cylinder 2.5 is made of insulating bakelite or insulating fiberglass tube, and connecting flanges are provided at the upper and lower ends. Among them, a heater fixing hole A2.5.2 (semicircular hole) is provided at the end of the lower flange, and two electrode wire mounting holes 2.5.1 are provided on the tube wall. The electrode wire mounting holes 2.5.1 are threaded holes; the position of one of the electrode wire mounting holes 2.5.1 corresponds to that of the insulating ring cylinder wire through hole 2.3.2 of the insulating ring cylinder 2.3; see the attached drawings of the specification Figure 13 : The electrode wire assembly 2.6 includes a wire 2.6.1, a contactor 2.6.2, and a contactor pressing bolt 2.6.3. The contactor pressing bolt 2.6.3 is made of insulating material; the contactor 2.6.2 is welded to the end of the wire 2.6.1, and the contactor pressing bolt 2.6.3 is sleeved on the wire 2.6.1;

[0042] When assembling the ion wind generator 2, first put the inner ring electrode 2.2 on the outside of the inner ring cylinder 2.1, and then put the insulating ring cylinder 2.3 on the outside of the inner ring electrode 2.2. When installing the outer ring electrode 2.4, unfold the ring cylinder shape and wrap it around the outside of the insulating ring cylinder 2.3, so that the corona generating head 2.4.2 passes through the insulating ring cylinder through hole 2.3.1, the inner ring electrode through hole 2.2.1, and the inner ring cylinder through hole 2.1.2 in sequence, and extends to the bottom of the inner ring cylinder spiral groove 2.1.1 (that is, the tapered head at the outer end of the corona generating head 2.4.2 extends into the inner cavity of the inner ring electrode 2.2); finally, put the outer ring cylinder 2.5 on the outside of the outer ring electrode 2.4; after the installation of the outer ring cylinder 2.5 is completed, insert one end of the contactor 2.6.2 of the electrode wire assembly 2.6 into the electrode wire installation hole 2.5.1 of the outer ring cylinder 2.5, and tighten the contactor compression bolt 2.6.3 to press the contactor 2.6.2 against the outer side surface of the inner ring electrode 2.2 or the outer ring electrode 2.4, so as to realize the electrical connection between the electrode wire assembly 2.6 and the inner ring electrode 2.2 and the outer ring electrode 2.4; finally, pour the insulating glue 2.7 into the gaps between the inner ring cylinder 2.1 and the insulating ring cylinder 2.3, and between the insulating ring cylinder 2.3 and the outer ring cylinder 2.5 from the lower part of the ion wind generator 2;

[0043] See the attached instruction Figure 14 、 15 : The heater 3 includes a heating tube 3.1 and a heat insulation sleeve 3.2. The heating tube 3.1 is bent into an S shape, and the distance between adjacent heating tubes 3.1 is greater than the length of the synthetic fiber to prevent the synthetic fiber from accumulating on the adjacent heating tubes 3.1; the heat insulation sleeve 3.2 is arranged at the lead-out end of the heating tube 3.1; the bottom plate 5 is in the shape of a circular ring plate, made of insulating bakelite, and is provided with a heater fixing hole B5.1 (semicircular hole) at the bottom; the heat insulation sleeve 3.2 of the heater 3 is arranged between the heater fixing hole A2.5.2 at the lower end of the outer ring cylinder 2.5 and the heater fixing hole B5.1 of the bottom plate 5, and the heater 3 is fixedly arranged at the lower part of the ion wind generator 2 through the bottom plate;

[0044] See the attached instruction Figure 4 、 6 : The feeder 4 is in the shape of a cylinder, with a connecting flange at the bottom and six feeder spiral grooves 4.1 on the inner side. The spiral direction of the feeder spiral grooves 4.1 is opposite to the spiral direction of the inner ring cylinder spiral groove 2.1.1; the feeder 4 is arranged at the upper end of the ion wind generator 2 and is fixedly connected to the ion wind generator 2 through the connecting flange; the vibrating screen assembly 1 is fixedly arranged on the connecting flange of the feeder 4 through four brackets 1.2.

[0045] When the pretreatment device of this embodiment is working, two electric vibrators 1.3 are energized to vibrate, forcing the vibrating screen 1.1 to vibrate in two directions; the heater 3 is energized to generate heat, producing a high temperature of about 150°C - 180°C; two electrode wire assemblies 2.6 are connected to a direct current of 60 kV - 100 kV, causing corona discharge to occur around the tapered head at the outer end of the corona head 2.4.2; when the heater 3 is energized to generate heat, it heats the air to form an upward flowing hot air current. When the hot air current passes through the inner cylinder 2.1 of the ion wind generator 2, it is affected by the spiral groove 2.1.1 of the inner cylinder and generates a rotating upward hot air; in this embodiment, heating the air by the heater 3 has three functions: 1. It can prevent the upward flowing air from flowing too fast, avoiding the problem that the synthetic fiber cannot fall; 2. The hot air is more likely to be ionized under the action of the high-voltage electric field, increasing the charge amount of the ion wind; 3. The heated air can reduce the relative humidity, preventing the ion wind from quickly returning to electrical neutrality due to too high relative humidity; when the rotating upward hot air current passes through the corona discharge area around the tapered head at the outer end of the corona head 2.4.2, ionization occurs, and ion exchange is carried out with the corona area, forming a charged upward flowing ion wind; the rotating upward flow of the hot air can extend the residence time in the ion wind generator 2, increasing the charge amount of the ion wind; when the rotating upward ion wind passes through the feeder 4, due to the change in the direction of the spiral groove 4.1 of the feeder, the rotating direction of the rotating upward ion wind will also change at this time, thereby generating a turbulent flow in the feeder 4, and the turbulent flow will make the overall charge amount of the ion wind more uniform;

[0046] When the synthetic fiber is gradually screened out from the vibrating screen 1.1 under the vibration of the vibrating screen 1.1, it is first affected by the resistance of the upward rotating ion wind in the feeder 4, slowing down the falling speed of the synthetic fiber and extending the falling time of the synthetic fiber, making the dispersed state of the bundled synthetic fiber better; at the same time, after the bundled synthetic fiber contacts the charged upward flowing ion wind, the synthetic fiber bundle becomes charged, and the charged synthetic fiber bundles repel each other with the same sex, promoting the separation of the bundled synthetic fibers; when the synthetic fiber falls into the ion wind generator 2, a low-pressure area will occur in the middle of the ion wind generator 2 due to the rotating upward hot air current. The low-pressure area will prevent the synthetic fiber from moving inward to the side wall of the inner cylinder 2.1 during the process of falling downward, preventing the synthetic fiber from accumulating in the spiral groove 2.1.1 of the inner cylinder.

[0047] When using the pretreatment device of the present invention to add synthetic fibers to asphalt mixtures, the bundled synthetic fibers are in a separated state, greatly improving the problem that the bundled synthetic fibers are prone to agglomeration. Therefore, the dispersibility of the synthetic fibers in the asphalt mixture is increased to about 95%. At the same time, it also greatly simplifies the complexity of the mixing process of adding synthetic fibers to asphalt mixtures, reduces the production difficulty of synthetic fiber asphalt mixtures, and solves the technical problems in the popularization and application of synthetic fiber asphalt mixtures in highway construction and maintenance.

[0048] The parts not detailed in the present invention are the prior art.

Claims

1. A pretreatment device for improving the dispersibility of synthetic fibers in asphalt mixtures, characterized by: The invention comprises a vibrating screen assembly (1), wherein the vibrating screen assembly (1) is arranged on the upper part of an aggregate mixing device; when the aggregate mixing device is in operation, synthetic fibers are placed in the vibrating screen assembly (1), and the vibrating screen assembly (1) vibrates, so that the synthetic fibers are gradually screened out of the vibrating screen assembly (1), and the bundled synthetic fibers are naturally dispersed by utilizing air resistance, and fall into the aggregate mixing device and are mixed together with the aggregate, thereby improving the dispersibility of the synthetic fibers in the aggregate; It also comprises an ion wind generator (2) and a heater (3), wherein the vibrating screen assembly (1) is fixedly arranged on the upper part of the ion wind generator (2), and the heater (3) is fixedly arranged on the lower part of the ion wind generator (2); when the heater (3) is powered on and generates heat, the heated air forms a hot wind flow that flows upward; An inner ring electrode (2.2) and an outer ring electrode (2.4) are coaxially arranged in the ion wind generator (2); an inner ring electrode through hole (2.2.1) is arranged in an array on the upper side of the inner ring electrode (2.2); a plurality of corona generating heads (2.4.2) are fixedly arranged in an array on the inner side of the outer ring electrode (2.4); the corona generating heads (2.4.2) pass through the inner ring electrode through hole (2.2.1) and extend into the inner cavity of the inner ring electrode (2.2); when high voltage direct current is applied between the inner ring electrode (2.2) and the outer ring electrode (2.4), corona is generated around the corona generating heads (2.4.2); when upwardly flowing hot air flows through the corona around the corona generating heads (2.4.2), the upwardly flowing hot air forms upwardly flowing ion wind; An insulating ring tube (2.3) is arranged between the inner ring electrode (2.2) and the outer ring electrode (2.4); an inner ring tube (2.1) is arranged on the inner side of the inner ring electrode (2.2); an outer ring tube (2.5) is arranged on the outer side of the outer ring electrode (2.4); a plurality of inner ring tube spiral grooves (2.1.1) are arranged on the inner side of the inner ring tube (2.1), a plurality of inner ring tube through holes (2.1.2) are arranged at the bottom of the inner ring tube spiral grooves (2.1.1), and a corona generating head (2.4.2) is arranged in the inner ring tube through hole (2.1.2).

2. The pretreatment device for improving the dispersibility of synthetic fibers in asphalt mixture according to claim 1, characterized in that: The vibrating screen assembly (1) comprises a vibrating screen (1.1), a bracket (1.2), and an electric vibrator (1.3); the vibrating screen (1.1) comprises a vibrating screen frame (1.1.1) and a vibrating screen mesh (1.1.2); the vibrating screen mesh (1.1.2) is fixedly arranged at the bottom of the vibrating screen frame (1.1.1); the aperture of the vibrating screen mesh (1.1.2) is smaller than the length of the synthetic fiber; the vibrating screen (1.1) is fixedly arranged at the top of the ion wind generator (2) through the bracket (1.2); the electric vibrator (1.3) is fixedly arranged outside the vibrating screen frame (1.1.1); the fixed position of the electric vibrator (1.3) corresponds to the bracket (1.2).

3. The pretreatment device for improving the dispersibility of synthetic fibers in asphalt mixture according to claim 1, characterized in that: The inner ring cylinder (2.1), the insulating ring cylinder (2.3) and the outer ring cylinder (2.5) are all made of insulating materials.

4. The pretreatment device for improving the dispersibility of synthetic fibers in asphalt mixture according to claim 1, characterized in that: The inner ring electrode (2.2), the outer ring electrode (2.4), and the corona generating head (2.4.2) are all made of conductive metal materials; the inner ring electrode (2.2) and the outer ring electrode (2.4) are in the shape of plates and are formed into a cylindrical shape by bending.

5. The pretreatment device for improving the dispersibility of synthetic fibers in asphalt mixture according to claim 1, characterized in that: The inner ring electrode (2.2) and the outer ring electrode (2.4) are led out through the electrode wire assembly (2.6); the electrode wire assembly (2.6) includes a wire (2.6.1), a contactor (2.6.2), and a contactor clamping bolt (2.6.3), and the contactor clamping bolt (2.6.3) is made of insulating material; the contactor (2.6.2) is welded to the end of the wire (2.6.1), and the contactor clamping bolt (2.6.3) is sleeved on the wire ( 2.6.1), and press the contactor (2.6.2) against the outer side of the inner ring electrode (2.2) or the outer ring electrode (2.4) through the contactor clamping bolt (2.6.3).

6. The pretreatment device for improving the dispersibility of synthetic fibers in asphalt mixture according to claim 1, characterized in that: The vibrating screen assembly (1) is fixedly arranged on the upper part of the ion wind generator (2) via a feeder (4); a plurality of feeder spiral grooves (4.1) are arranged on the inner side of the feeder (4); and the spiral direction of the feeder spiral grooves (4.1) is opposite to the spiral direction of the inner ring cylinder spiral grooves (2.1.1).

7. The pretreatment device for improving the dispersibility of synthetic fibers in asphalt mixture according to claim 1, characterized in that: The heater (3) comprises a heating tube (3.1) and a heat insulating sleeve (3.2); the heating tube (3.1) is bent into an S shape; the heat insulating sleeve (3.2) is arranged at the lead-out end of the heating tube (3.1); and the heater (3) is fixedly arranged at the lower part of the ion wind generator (2) via a bottom plate (5).

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