Pretreatment device for improving dispersity of synthetic fibers in asphalt mixture

Abstract

A pretreatment device for improving dispersity of synthetic fibers in an asphalt mixture comprises a vibrating screen assembly, an ionic wind generator and a heater. The pretreatment device is arranged at 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 from the vibrating screen assembly and fall down; the heater is electrified to heat air to form hot air flow flowing upwards; when the hot air flow passes through the ionic wind generator, electrified ionic wind flowing upwards is formed; when the synthetic fibers are screened out from the vibrating screen assembly and fall down, the ion wind flowing upwards prolongs the falling time of the synthetic fibers, so that the bunchy synthetic fibers are naturally dispersed under the action of the ion wind; meanwhile, after the bunchy synthetic fibers are in contact with the electrified upwards-flowing ionic wind, the synthetic fiber bunchy is electrified, the electrified synthetic fiber bunchy repels in like polarity, the bunchy synthetic fibers are promoted to be further dispersed, and therefore the dispersity of the synthetic fibers in the aggregate is improved.

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 technology, the present invention discloses a pretreatment device for improving the dispersion of synthetic fibers in asphalt mixture, overcomes the deficiencies of the prior art, further improves the dispersion of synthetic fibers in asphalt mixture, and solves the technical difficulties of the complex production process of synthetic fiber asphalt mixture.

[0007] In order to achieve the above-mentioned purpose of the invention, the present invention adopts the following technical scheme: it includes a vibrating screen assembly, which is arranged on the upper part of the aggregate mixing device; when the aggregate mixing device is working, the 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, and the bundled synthetic fibers fall into the aggregate mixing device and are stirred together with the aggregate, thereby improving the dispersion of the synthetic fibers in the aggregate.

[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, the heated air forms an upward-flowing hot wind flow. When the hot wind flow passes through the ion wind generator, an upward-flowing charged ion wind is formed. When the synthetic fibers are gradually screened out from the vibrating screen assembly, the upward-flowing ion wind increases the resistance of the synthetic fibers to falling downward, prolongs the falling time of the synthetic fibers, and makes the bundled synthetic fibers better dispersed. At the same time, after the bundled synthetic fibers come into contact with the charged upward-flowing ion wind, the synthetic fiber bundles are charged, and the charged synthetic fiber bundles repel each other with like charges, which promotes the separation of the bundled synthetic fibers, and further improves the dispersion of the synthetic fibers in the aggregate.

[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, the vibrating screen mesh is fixedly arranged at the lower part of the vibrating screen frame, and the aperture of the vibrating screen mesh is smaller than the length of the synthetic fiber; 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 outer side 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, an array of inner ring electrode through holes is arranged on the inner ring electrode, and a plurality of corona generating heads are fixedly arranged in an array on the inner side of the outer ring electrode, and the corona generating heads pass through the inner ring electrode through holes and extend into the inner cavity of the inner ring electrode; when high-voltage direct current is applied between the inner ring electrode and the outer ring electrode, corona is generated around the corona generating heads; when the upward-flowing hot air flows through the corona around the corona generating heads, the upward-flowing hot air forms an upward-flowing ion wind.

[0011] Furthermore, an insulating ring tube is arranged between the inner ring electrode and the outer ring electrode; an inner ring tube is arranged on the inner side of the inner ring electrode; an outer ring tube is arranged on the outer side of the outer ring electrode; a plurality of inner ring tube spiral grooves are arranged on the inner side of the inner ring tube, a plurality of inner ring tube through holes are arranged at the bottom of the inner ring tube spiral grooves, and a corona generating head is arranged in the inner ring tube through holes.

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

[0013] Furthermore, 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] Furthermore, 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 clamping bolt, and the contactor clamping bolt is made of insulating material; the contactor is welded to the end of the wire, and the contactor clamping bolt is sleeved on the wire, and the contactor is clamped to the outer side of the inner ring electrode or the outer ring electrode through the contactor clamping bolt.

[0015] Furthermore, the vibrating screen assembly is fixedly arranged on the upper part of the ion wind generator through a feeder; a plurality of feeder spiral grooves are arranged on the inner side of the feeder; and the spiral direction of the feeder spiral groove is opposite to the spiral direction of the inner ring cylinder spiral groove.

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

[0017] Due to the adoption of the technical scheme as described above, the present invention has the following beneficial effects: a pretreatment device for improving the dispersibility of synthetic fibers in asphalt mixture disclosed in the present invention comprises a vibrating screen assembly, an ion wind generator, and a heater, wherein 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; the pretreatment device is arranged on the upper part of the aggregate mixing device, and when the aggregate mixing device is working, the 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 from the vibrating screen assembly; the heater is energized to generate heat to heat the air, forming an upward-flowing hot air flow, and when the hot air flow passes through the ion wind generator, a charged upward-flowing ion wind 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 come into contact with the charged upward-flowing ion wind, the synthetic fiber bundles are charged, and the charged synthetic fiber bundles repel each other with the same charges, which promotes the further dispersion of the bundled synthetic fibers, thereby improving the dispersibility of the synthetic fibers in the aggregate. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1This is a schematic diagram of the appearance of a vibrating screen assembly; Figure 2 This is a schematic diagram of the appearance of the pretreatment device; Figure 3 It is a schematic diagram of the structural decomposition of the pretreatment device; Figure 4 It is a schematic diagram of the cross-sectional structure of the pretreatment device; Figure 5 for Figure 4 A schematic diagram of a local A enlargement; Figure 6 This is a schematic diagram of the appearance of the feeder; Figure 7 This is a schematic diagram of the decomposition of the ion wind generator structure; Figure 8 This is a schematic diagram of the appearance of the inner ring cylinder; Fig. 9 This is a schematic diagram of the appearance of the inner ring electrode; Fig.10 This is a schematic diagram of the appearance of the insulating ring cylinder; Fig.11 Schematic diagram of the outer ring electrode appearance; Fig.12 This is a schematic diagram of the appearance of the outer ring cylinder; Fig.13 This is a schematic diagram of the appearance of the electrode wire assembly; Fig.14 This is a schematic diagram of the appearance of the heater; Fig.15 This is a schematic diagram of the base plate appearance.

[0019] 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. Bracket; 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 clamping bolt; 2.7. Insulating glue; 3. Heater; 3.1. Heating tube; 3.2. Insulating sleeve; 4. Feeder; 4.1. Feeder spiral groove; 5. Bottom plate; 5.1. Heater fixing hole B. DETAILED DESCRIPTION

[0020] The present invention can be explained in detail by the following examples, and the purpose of disclosing the present invention is to protect all technical improvements within the scope of the present invention.

[0021] Example 1, see the attached specification Figure 1 : A pretreatment device for improving the dispersion of synthetic fibers in asphalt mixture, comprising a vibrating screen assembly 1, which is arranged on the upper part of an aggregate mixing device; 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, wherein the vibrating screen mesh 1.1.2 is a fine steel wire mesh interwoven with warp and weft, 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 smaller than the length of the synthetic fibers by 3-4 m m, for example, when the length of the synthetic fiber is 19 mm, the aperture of the vibration screen 1.1.2 is 15-16 mm; the vibration screen 1.1 is fixedly arranged on the upper part of the mixing device through four "Z" shaped brackets 1.2, the upper end of the bracket 1.2 is fixedly arranged on the bottom of the vibration screen frame 1.1.1 by welding, and the lower end of the bracket 1.2 is connected by bolts and arranged on the upper part of the mixing device; two electric vibrators 1.3 are provided, which are respectively fixedly arranged on the outer side of the vibration screen frame 1.1.1, corresponding to the two adjacent brackets 1.2; When the aggregate mixing device is working, the aggregate is placed in the mixing device for stirring, and the synthetic fiber to be mixed with the aggregate is placed in the vibrating screen 1.1. Since the aperture of the vibrating screen 1.1.2 is smaller than the length of the synthetic fiber, the synthetic fiber will be placed horizontally on the vibrating screen 1.1.2, and will not fall directly into the aggregate mixing device through the vibrating screen 1.1.2; when the two electric vibrators 1.3 are energized, they vibrate, forcing the vibrating screen 1.1 to vibrate in two directions, gradually vibrating out some of the bundled synthetic fibers; when the synthetic fiber (or synthetic fiber bundle) is vibrated in two directions, it will be displaced on the vibrating screen 1.1.2, and when one end of the synthetic fiber (or synthetic fiber bundle) is supported on the fine steel of the vibrating screen 1.1.2 When the synthetic fibers (or synthetic fiber bundles) are mostly suspended on the wire and the other end is mostly suspended in the air, the synthetic fibers (or synthetic fiber bundles) will change from a horizontal state to a nearly vertical state, and will be continuously screened out from the vibrating screen 1.1 under the action of vibration, and fall into the aggregate mixing device to be mixed with the aggregate; a single or only a few synthetic fiber bundles will swing in a nearly horizontal state and slowly fall, and a larger synthetic fiber bundle will encounter air resistance in a nearly vertical state at the beginning of the falling process. The air resistance will cause the synthetic fiber bundles to disperse naturally and become a single or only a few synthetic fiber bundles, and then swing in a nearly horizontal state and slowly fall, thereby solving the problem that the bundled synthetic fibers are easy to agglomerate when directly added to the aggregate, and improving the dispersibility of the synthetic fibers in the aggregate.

[0022] Example 2, see the attached specification Figure 2-4 : This embodiment also 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 on the upper part of the ion wind generator 2 through the feeder 4, and the heater 3 is fixedly arranged on the lower part of the ion wind generator 2 through the bottom plate 5. When the pretreatment device of this embodiment is working, it is fixedly arranged on the upper part of the aggregate mixing device; See the instruction manual Figure 7 : The ion wind generator 2 includes an inner ring tube 2.1, an inner ring electrode 2.2, an insulating ring tube 2.3, an outer ring electrode 2.4, an outer ring tube 2.5, and an electrode wire assembly 2.6, wherein the inner ring tube 2.1, the inner ring electrode 2.2, the insulating ring tube 2.3, the outer ring electrode 2.4, and the outer ring tube 2.5 are all ring-shaped structures, which are nested in sequence to form a concentric ring structure; see the attached manual Figure 5 Insulating glue 2.7 is also provided at the lower part of the inner ring electrode 2.2 and the outer ring electrode 2.4; See the instruction manual Figure 8 The inner ring tube 2.1 is made of insulating bakelite or insulating glass fiber tube, and the inner wall is provided with six left-handed inner ring tube spiral grooves 2.1.1. The bottom of the inner ring tube spiral grooves 2.1.1 is provided with a number of inner ring tube through holes 2.1.2; see the attached manual Fig. 9 :The inner ring electrode 2.2 is made of copper sheet or stainless steel sheet, which is bent into a cylindrical structure; a plurality of inner ring electrode vias 2.2.1 are arranged in an array on the inner ring electrode 2.2, and the positions of the inner ring electrode vias 2.2.1 correspond to the inner ring tube vias 2.1.2; see the attached manual Fig.10 The insulating ring tube 2.3 is made of insulating bakelite or insulating glass fiber tube, and a plurality of insulating ring tube through holes 2.3.1 are arranged in an array on the tube wall. The positions of the insulating ring tube through holes 2.3.1 correspond to the positions of the inner ring electrode through holes 2.2.1. In addition, an insulating ring tube wire through hole 2.3.2 is also provided on the insulating ring tube 2.3, and the 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 manual Fig.11 : The outer ring electrode 2.4 is made of copper sheet or stainless steel sheet (copper sheet is easy to bend and install), and a cylindrical structure is formed by bending; a plurality of corona generating heads 2.4.2 made of copper are welded in an array on the inner side of the outer ring electrode 2.4, and the outer end thereof is in a pointed cone shape, and the position of the corona generating heads 2.4.2 corresponds to the insulating ring tube through hole 2.3.1; in addition, an inner ring electrode wire avoidance hole 2.4.1 is also provided at the lower part of the outer ring electrode 2.4, and the 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 manual Fig.12:The outer ring tube 2.5 is made of insulating bakelite or insulating glass fiber tube, with connecting flanges at both ends, wherein the lower flange end is provided with a heater fixing hole A2.5.2 (a semicircular hole), and the tube wall is provided with two electrode wire mounting holes 2.5.1, which are threaded holes; one of the electrode wire mounting holes 2.5.1 is located corresponding to the insulating ring tube wire through hole 2.3.2 of the insulating ring tube 2.3; see the attached manual Fig.13 : 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, wherein 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; When assembling the ion wind generator 2, firstly, the inner ring electrode 2.2 is sleeved on the outer side of the inner ring tube 2.1, and then the insulating ring tube 2.3 is sleeved on the outer side of the inner ring electrode 2.2; when installing the outer ring electrode 2.4, the ring tube is unfolded and wrapped around the outer side of the insulating ring tube 2.3, so that the corona generating head 2.4.2 passes through the insulating ring tube through hole 2.3.1, the inner ring electrode through hole 2.2.1, and the inner ring tube through hole 2.1.2 in sequence, and extends to the bottom of the inner ring tube spiral groove 2.1.1 (that is, the pointed cone head of the outer end of the corona generating head 2.4.2 extends to the inner cavity of the inner ring electrode 2.2); finally, the outer ring tube 2.5 is sleeved on the outer ring electrode The electrode 2.4 is installed outside; after the outer ring tube 2.5 is installed, 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 tube 2.5, and tighten the contactor clamping bolt 2.6.3 to press the contactor 2.6.2 against the outer side of the inner ring electrode 2.2 or the outer ring electrode 2.4 to achieve 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 from the lower part of the ion wind generator 2 into the gap between the inner ring tube 2.1 and the insulating ring tube 2.3, and between the insulating ring tube 2.3 and the outer ring tube 2.5; See the instruction manual Fig.14 , 15 :The heater 3 includes a heating tube 3.1 and a heat-insulating sleeve 3.2. The heating tube 3.1 is bent into an S shape. The distance between adjacent heating tubes 3.1 is greater than the length of the synthetic fiber to prevent the synthetic fiber from falling on the adjacent heating tubes 3.1 and accumulating; the heat-insulating 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 an annular plate and is made of insulating bakelite. A heater fixing hole B5.1 (a semicircular hole) is arranged at the bottom; the heat-insulating 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 tube 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; See the instruction manual Figure 4 , 6: The feeder 4 is cylindrical, with a connecting flange at the bottom and six feeder spiral grooves 4.1 on the inside. The spiral direction of the feeder spiral groove 4.1 is opposite to the spiral direction of the inner ring tube 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 a connecting flange; the vibrating screen assembly 1 is fixedly arranged on the connecting flange of the feeder 4 through four brackets 1.2.

[0023] When the pretreatment device of this embodiment is working, the 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, generating a high temperature of about 150°C-180°C; the two electrode wire assemblies 2.6 are connected to a 60kV-100kV direct current, so that corona discharge is generated around the pointed cone head at the outer end of the corona generating head 2.4.2; when the heater 3 is energized to generate heat, the heated air forms an upward-flowing hot wind flow, and when the hot wind flow passes through the inner ring cylinder 2.1 of the ion wind generator 2, it is affected by the spiral groove 2.1.1 of the inner ring cylinder to generate rotating upward hot wind; in this embodiment, the use of the heater 3 to heat the air has three functions: 1. It can avoid the problem that the upward-flowing air speed is too fast, resulting in the problem that the synthetic fiber cannot fall; 2. The heat The air is more easily ionized under the action of the high-voltage electric field, which increases the charge of the ion wind; 3. The heated air can reduce the relative humidity to prevent the ion wind from returning to electrical neutrality too quickly due to excessive relative humidity; when the rotating upward hot wind flows through the corona discharge area around the cone head at the outer end of the corona generating head 2.4.2, ionization occurs, and ions are exchanged with the corona area to form a charged ion wind that flows upward; the rotating upward flow of the hot air can extend the time it stays in the ion wind generator 2 and increase the charge of the ion wind; when the rotating upward ion wind flows through the feeder 4, the direction of the feeder spiral groove 4.1 changes, and the rotation direction of the rotating upward ion wind will also change, thereby generating turbulence in the feeder 4, and the turbulence will make the overall charge of the ion wind more uniform; When the synthetic fibers are gradually screened out from the vibrating screen 1.1 under the vibration action of the vibrating screen 1.1, they are first affected by the resistance of the ionic wind rotating upward in the feeder 4, which slows down the falling speed of the synthetic fibers, prolongs the falling time of the synthetic fibers, and makes the dispersion state of the bundled synthetic fibers better; at the same time, after the bundled synthetic fibers come into contact with the charged ionic wind flowing upward, the synthetic fiber bundles are charged, and the charged synthetic fiber bundles repel each other, which promotes the separation of the bundled synthetic fibers; when the synthetic fibers fall into the ion wind generator 2, the rotating upward hot air flow will generate a low-pressure area in the middle of the ion wind generator 2, and the low-pressure area will prevent the synthetic fibers from moving toward the side wall of the inner ring cylinder 2.1 during the downward falling process, thereby preventing the synthetic fibers from accumulating in the spiral groove 2.1.1 of the inner ring cylinder.

[0024] When the pretreatment device of the present invention is used to add synthetic fibers to the asphalt mixture, the bundled synthetic fibers are separated, which greatly improves the problem of easy agglomeration of the bundled synthetic fibers. Therefore, the dispersion of the synthetic fibers in the asphalt mixture is improved to about 95%. At the same time, it also greatly simplifies the complexity of the mixing process of the synthetic fibers added to the asphalt mixture, reduces the difficulty of producing the synthetic fiber asphalt mixture, and solves the technical difficulties in promoting the application of the synthetic fiber asphalt mixture in highway construction and maintenance.

[0025] Parts of the present invention not described in detail are 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.

2. The pretreatment device for improving the dispersibility of synthetic fibers in asphalt mixture according to claim 1, characterized in that: The invention 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 flowing upward; when the hot wind flow passes through the ion wind generator (2), a charged ion wind flowing upward is formed; when the synthetic fibers are gradually screened out from the vibrating screen assembly (1), the ion wind flowing upward increases the resistance of the synthetic fibers falling downward, prolongs the falling time of the synthetic fibers, and makes the bundled synthetic fibers more dispersed; at the same time, after the bundled synthetic fibers come into contact with the charged ion wind flowing upward, the synthetic fiber bundles are charged, and the charged synthetic fiber bundles repel each other with the same charge, which promotes the separation of the bundled synthetic fibers, and further improves the dispersion of the synthetic fibers in the aggregate.

3. 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).

4. The pretreatment device for improving the dispersibility of synthetic fibers in asphalt mixture according to claim 3, characterized in that: 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.

5. The pretreatment device for improving the dispersibility of synthetic fibers in asphalt mixture according to claim 4, characterized in that: 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).

6. The pretreatment device for improving the dispersibility of synthetic fibers in asphalt mixture according to claim 5, characterized in that: The inner ring cylinder (2.1), the insulating ring cylinder (2.3), the outer ring cylinder (2.5) and the bottom plate (5) are all made of insulating materials.

7. The pretreatment device for improving the dispersibility of synthetic fibers in asphalt mixture according to claim 5, 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.

8. The pretreatment device for improving the dispersibility of synthetic fibers in asphalt mixture according to claim 5, 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).

9. The pretreatment device for improving the dispersibility of synthetic fibers in asphalt mixture according to claim 5, 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).

10. The pretreatment device for improving the dispersibility of synthetic fibers in asphalt mixture according to claim 2, 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).

Images