A mixing method for fiber-modified asphalt

Abstract

The present invention provides a method for mixing fiber-modified asphalt, belonging to the technical field of asphalt modification. It includes a material storage barrel, a material pipe, a clamping rod, a blowing component and a lifting component. The material storage barrel is used for storing asphalt. The material pipe is located above the material storage barrel. The top end of the material pipe is connected to the clamping rod. The top end of the material pipe is externally connected to the blowing component through an air inlet pipe. The bottom of the material pipe is fixedly provided with a bottom plate uniformly and perforated with a plurality of discharge holes. A switch component for opening and closing the discharge holes is provided at the bottom end of the material pipe. Fibers are loaded into the material pipe, and then the material pipe is inserted into the asphalt in the material storage barrel. The air compressor is started. After the pressure in the material pipe reaches a certain value, the discharge holes at the bottom of the material pipe are opened, and the material pipe is controlled to slowly rise. The fibers are blown into the asphalt, and during the rising process of the material pipe, the flowing asphalt wraps the falling fibers, so as to achieve the effect of uniform mixing of the fibers and the asphalt. The dispersibility and uniformity of the fibers in the asphalt are improved, and the probability of the fibers climbing the rod and winding around the axis can be reduced.

Description

Technical Field

[0001] The present invention relates to the technical field of asphalt modification, and particularly to a mixing method for fiber-modified asphalt. Background Art

[0002] Fiber-modified asphalt refers to a kind of asphalt in which fiber materials are added to modified asphalt. Adding fiber materials to asphalt can improve its thermal stability, low-temperature cracking resistance, durability and tensile strength. The traditional production method of fiber-modified asphalt is to put fibers and asphalt into a mixer and stir them together. However, since fiber materials are not soluble in asphalt and have a large aspect ratio, during the traditional high-speed stirring process with asphalt, the fiber materials are prone to climbing the rod and winding around the axis, and the phenomenon of fiber wrapping the axis is likely to occur, resulting in problems of low dispersion efficiency and poor dispersion uniformity.

[0003] In response to this problem, there has also emerged a method of blowing fibers onto the surface of asphalt through an air compressor and a blowing mechanism, and then mixing them through a mixing device. For example, the Chinese invention patent application with the publication number CN113355977A discloses a mixing device and a mixing method for fiber-modified asphalt concrete. A mixing mechanism is arranged directly above the material storage cylinder. The mixing mechanism includes an upper frame body and a reciprocating telescopic mechanism installed on the upper frame body. The telescopic end of the reciprocating telescopic mechanism faces vertically downward the opening of the material storage cylinder, and a mixing head is installed on the telescopic end of the reciprocating telescopic mechanism, so that the mixing head can axially extend into and withdraw from the material storage cylinder under the action of the reciprocating telescopic mechanism to mix the asphalt in the material storage cylinder. The mixing device for fiber-modified asphalt concrete of this invention has the advantages of being able to reduce the probability of fiber climbing the rod and winding around the axis and improving the fiber dispersion rate.

[0004] However, since most of the fibers fall on the surface of the asphalt in this method, it is difficult for them to penetrate deep into the interior of the asphalt through the mixing mechanism, and the dispersion and uniformity of the fibers in the asphalt still cannot be guaranteed. Therefore, to obtain modified asphalt with excellent performance, the problem of the uniformity of fiber dispersion in asphalt must be solved, and the key is to find a method to effectively improve the dispersion performance of fibers in asphalt. Summary of the Invention

[0005] In view of the above problems in the prior art, the present invention provides a mixing method for fiber-modified asphalt.

[0006] In order to achieve the above invention object, the technical solution adopted by the present invention is as follows:

[0007] Provided is a mixing method for fiber-modified asphalt, including a material storage bucket, a material pipe, a clamping rod, a blowing assembly, and a lifting assembly. The material storage bucket is used to hold asphalt. The material pipe is located above the material storage bucket, and the top end of the material pipe is connected to the clamping rod. An inner cavity for holding fibers is provided in the material pipe. The top end of the material pipe is externally connected to the blowing assembly through an air inlet pipe. The bottom end of the material pipe faces the upper opening of the material storage bucket. A bottom plate is coaxially and fixedly provided at the bottom of the material pipe, and a plurality of discharge holes are uniformly and penetratingly formed in the bottom plate. A switch assembly for opening and closing the discharge holes is provided at the bottom end of the material pipe. The lifting assembly is used to drive the clamping rod to vertically lift and lower.

[0008] Further, the blowing assembly is an air compressor, and the air outlet end of the air compressor is connected to the top end of the material pipe through the air inlet pipe.

[0009] Further, the lifting assembly includes a base and a support rod. The base is provided on one side of the material storage bucket. The support rod is a hydraulic telescopic rod. One end of the support rod is vertically and fixedly connected to the support rod, and the other end is fixedly connected to the clamping rod.

[0010] Further, a plurality of material pipes are provided, and the plurality of material pipes are horizontally spaced on the clamping rod.

[0011] Further, a plurality of clamping mechanisms are horizontally spaced on the clamping rod, and the material pipe is detachably connected to the clamping rod through the clamping mechanism.

[0012] Further, the clamping mechanism includes two elastic cross bars. One end of the same side of the two elastic cross bars is fixedly connected to the clamping rod. A plurality of concave portions for fitting the outer wall of the material pipe are spaced on the mutually approaching surfaces of the two elastic cross bars. Screws and nuts are provided on both sides of each concave portion on the elastic cross bar, and the two elastic cross bars are clamped to the material pipe by screwing the screws and nuts.

[0013] Further, a heating mechanism for heating the asphalt in the material storage bucket is provided at the bottom of the material storage bucket, and the heating mechanism is a resistance wire.

[0014] Further, a pipe plug is detachably provided at the top of the material pipe, and the air inlet pipe is connected to the pipe plug.

[0015] Further, the switch assembly includes a bottom cover and a motor. The bottom cover is attached to the bottom plate and is coaxially and rotatably connected to the bottom plate. A plurality of cover holes are uniformly and penetratingly formed in the bottom cover. The discharge holes on the bottom plate correspond to the cover holes on the material pipe one by one. The motor is used to drive the bottom cover to rotate.

[0016] Further, a pressure sensor is provided in the material pipe. The pressure sensor is electrically connected to the motor. The pressure sensor is used to detect the pressure in the material pipe. When the pressure sensor detects that the pressure in the material pipe reaches the set value, the motor starts and drives the bottom cover to rotate until the discharge holes on the bottom plate are aligned with the cover holes on the bottom cover.

[0017] The beneficial effects of the present invention are as follows:

[0018] The mixing device of the fiber-modified asphalt concrete is simply arranged and convenient to operate and use. The fibers in the material pipe are blown into the asphalt by an air compressor, which improves the dispersibility and uniformity of the fibers in the asphalt, can reduce the probability of the fibers climbing the rod and winding around the axis, and is beneficial to improving the fiber dispersion rate. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 is a schematic diagram of the overall structure of the mixing device according to an embodiment of the present application;

[0020] Figure 2 is a partial sectional structure schematic diagram of the material pipe according to an embodiment of the present application;

[0021] Figure 3 is a partial structure explosion schematic diagram of the material pipe, the pipe plug and the clamping mechanism according to an embodiment of the present application;

[0022] Figure 4 is a schematic diagram of the logic circuit according to an embodiment of the present application;

[0023] Among them, 1, material storage bucket; 2, material pipe; 21, air inlet pipe; 22, pipe plug; 3, clamping rod; 4, lifting assembly; 41, base; 42, support rod; 5, switch assembly; 51, bottom cover; 511, cover hole; 52, bottom plate; 521, discharge hole; 53, motor; 6, clamping mechanism; 61, elastic cross bar; 62, screw; 63, nut; 7, heating mechanism; 8, pressure sensor; 9, processor. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0024] In order to better understand the above technical solutions, the above technical solutions will be described in detail below in conjunction with the accompanying drawings of the specification and specific embodiments.

[0025] An embodiment of the present invention provides a method for mixing fiber-modified asphalt. Referring to Figure 1 and Figure 2 , it includes a material storage bucket 1, a material pipe 2, a clamping rod 3, a blowing assembly (not shown in the figure) and a lifting assembly 4. The material storage bucket 1 is placed on the ground, and the upper part of the material storage bucket 1 is open for containing asphalt. The material pipe 2 is installed on the clamping rod 3 and is located above the material storage bucket 1. The clamping rod 3 is supported on the ground by the lifting assembly 4, and the clamping rod 3 and the material pipe 2 can be vertically lifted relative to the material storage bucket 1 through the lifting assembly 4. The inside of the material pipe 2 is hollow, and the inside of the material pipe 2 is set as an inner cavity for containing fibers. The top of the material pipe 2 is connected with an air inlet pipe 21. The material pipe 2 is connected with the blowing assembly through the air inlet pipe 21. The bottom of the material pipe 2 is provided with a discharge hole 521 for blowing out the fibers. The bottom of the material pipe 2 faces the upper opening of the material storage bucket 1, and the bottom of the material pipe 2 is provided with a switch assembly 5 for opening and closing the discharge hole 521 at the bottom of the pipeline.

[0026] When mixing asphalt and fibers, the fibers to be mixed are placed in the material pipe 2. The lifting component 4 drives the clamping rod 3 to descend, so that the bottom end of the material pipe 2 is inserted into the asphalt in the lower material bucket 1. Then, the air blowing component and the switch component 5 are turned on, and air can be blown into the asphalt from the material pipe 2. During the air blowing process, the fibers in the material pipe 2 are blown into the interior of the asphalt through the discharge holes 521 at the bottom end of the material pipe 2. At the same time, through the multiple discharge holes 521 at the bottom of the material pipe 2, the air flow in the material pipe 2 can be evenly dispersed into the asphalt, forming several air cavities in the asphalt. At this time, the lifting component 4 drives the clamping rod 3 and the material pipe 2 to be gradually pulled out upward. Under the flow of the asphalt, the asphalt around the top of the air cavity flows towards the middle concave part, wrapping the falling fibers. During the process of the gas rising from the asphalt to bursting, the fibers floating in the air cavity gradually adhere to the surface of the flowing asphalt, thus achieving the effect of uniform mixing of the fibers and the asphalt. By rotating the material bucket 1 and inserting the material pipe 2 into the asphalt from multiple angles repeatedly, it can ensure that the fibers are evenly added to the asphalt, reduce the probability of the fibers climbing the rod and winding around the axis, and is beneficial to improving the fiber dispersion rate.

[0027] Specifically, the air blowing component can be an air compressor. One end of the air inlet pipe 21 away from the material pipe 2 is connected to the air outlet end of the air compressor. By starting the air compressor, air can be filled into the material pipe 2 through the air inlet pipe 21. In other embodiments, the air blowing component can also be a blower. The lifting component 4 can include a base 41 and a support rod 42. The base 41 is located on one side of the material bucket 1, and the base 41 is placed on the ground. The support rod 42 is a hydraulic telescopic rod, and the cylinder body of the hydraulic telescopic rod is vertically fixedly connected to the base 41 by means of bolt connection or the like. The top end of the hydraulic telescopic rod is connected to the clamping rod 3. In other embodiments, the support rod 42 can also be an electric push rod or a cylinder.

[0028] In the embodiment of the present application, the switch component 5 includes a bottom cover 51 and a motor 53. The bottom cover 51 is closely attached to the lower side of the bottom plate 52 of the material pipe 2. The bottom cover 51 can be coaxially rotatably connected to the bottom plate 52. A plurality of cover holes 511 are uniformly penetrated through the bottom cover 51. The number of cover holes 511 is the same as the number of discharge holes 521 on the bottom plate 52. The bottom cover 51 can be rotated to make the cover holes 511 correspond to the discharge holes 521 one by one, and the bottom cover 51 can be rotated to make all the cover holes 511 and the discharge holes 521 be misaligned. In order to drive the bottom cover 51 to rotate relative to the material pipe 2, a motor 53 for driving the bottom cover 51 to rotate is also provided in the material pipe 2. The motor 53 can be fixedly connected to the bottom plate 52 by bolt connection, so that the output shaft of the motor 53 passes through the bottom plate 52 and is coaxially fixedly connected to the bottom cover 51. In other embodiments, the bottom cover 51 can also be arranged inside the material pipe 2, and the motor 53 can be installed in the upper middle part of the material pipe 2, so that the output shaft of the motor 53 extends downward to be connected to the bottom cover 51, increasing the installation height of the motor 53 to reduce the influence of the ambient temperature on the motor 53 when the material pipe 2 is inserted into the asphalt.

[0029] Reference Figure 4 Furthermore, in order to improve the efficiency of the mixing operation and prevent asphalt from entering the material pipe 2, in the embodiment of the present application, a pressure sensor 8 is further provided inside the material pipe 2. The pressure sensor 8 is externally connected to a processor 9, and the processor 9 is electrically connected to both the pressure sensor 8 and the motor 53 at the same time. The processor 9 can be a PLC controller or a computer. The pressure sensor 8 is used to detect the pressure inside the material pipe 2. By setting a pressure value, after the material pipe 2 extends into the asphalt in the material storage bucket 1, the air compressor is turned on to increase the air pressure inside the material pipe 2. When the pressure inside the material pipe 2 detected by the pressure sensor 8 reaches the set pressure value, the processor 9 controls the motor 53 to be turned on, so that the bottom cover 51 rotates until the cover hole 511 on it is aligned with the discharge hole 521 on the bottom plate 52, and then air can be blown into the asphalt from the discharge hole 521 of the material pipe 2. The set pressure value should be at least greater than the pressure value of the liquid asphalt at the bottom of the material storage bucket 1 to ensure that the asphalt will not pour into the material pipe 2 after the bottom cover 51 rotates to open the material pipe 2.

[0030] By setting the pressure sensor 8, the operator can make the bottom cover 51 automatically rotate and open with the pressure inside the material pipe 2 reaching the standard after the air compressor is turned on, which improves the mixing efficiency and effectively prevents the asphalt from pouring into the material pipe 2, effectively preventing the fibers from adhering and accumulating inside the material pipe 2 and at the discharge port, and improving the utilization rate of the blown fibers.

[0031] In the embodiment of the present application, multiple material pipes 2 are installed on the clamping rod 3, and the material pipes 2 are arranged at equal intervals along the length direction of the clamping rod 3, which can increase the range of the fibers covering the asphalt when the material pipes 2 are inserted into the asphalt in the material storage bucket 1 to blow out the fibers, and improve the efficiency of mixing the asphalt and the fibers.

[0032] Reference Figure 3 The number and positions of the material pipes 2 on the clamping rod 3 can be flexibly controlled. In the embodiment of the present application, a plurality of clamping mechanisms 6 are horizontally spaced on the clamping rod 3, and the material pipes 2 are detachably connected to the clamping rod 3 through the clamping mechanisms 6. Specifically, the clamping mechanism 6 includes two elastic cross bars 61. One end of the same side of the two elastic cross bars 61 is fixedly connected to the clamping rod 3. A plurality of concave portions for fitting the outer wall of the material pipe 2 are spaced on the mutually approaching surfaces of the two elastic cross bars 61. The material pipe 2 is located between two mutually facing concave portions on the two elastic cross bars 61. On the elastic cross bars 61, a screw 62 and a nut 63 are provided on both sides of each concave portion. The screw 62 passes through the two elastic cross bars 61, and the screw 62 is threadedly connected to the nut 63 after passing through the two elastic cross bars 61. By tightening the nut 63 and the screw 62, the two elastic cross bars 61 can be squeezed closer, so as to clamp and fix the material pipe 2 between the two elastic cross bars 61.

[0033] By detachably installing the material pipe 2 and the clamping rod 3, the staff can flexibly select an appropriate number of material pipes 2 according to the size of the material bucket 1 for fiber mixing operations, and can flexibly move the material bucket 1 and change the number of material pipes 2 to ensure uniform addition of fibers to various positions in the material bucket 1.

[0034] For the convenience of the operator to add and supplement fibers into the material pipe 2, in the embodiment of the present application, the top of the material pipe 2 is designed to be open, and a pipe plug 22 is detachably installed at the top of the material pipe 2. An air inlet pipe 21 is fixedly connected to the pipe plug 22. In the embodiment of the present application, the pipe plug 22 is threadedly connected to the material pipe 2. In other embodiments, the pipe plug 22 can also be connected by means such as snap connection and interference connection. When the pipe plug 22 is connected to the material pipe 2, the material pipe 2 is connected to an air compressor through the air inlet pipe 21 on the pipe plug 22.

[0035] Since the material bucket 1 is placed on the ground, the asphalt in the material bucket 1 cools down relatively quickly through heat conduction of the material bucket 1. In the embodiment of the present application, a heating mechanism 7 for heating the asphalt in the material bucket 1 is further provided at the bottom of the material bucket 1. The heating mechanism 7 is a resistance wire. In other embodiments, the heating mechanism 7 can also be a common heating instrument such as a steam coil. By setting the heating mechanism 7, the asphalt can be heated. The heated asphalt has viscosity and fluidity, which is convenient for uniform mixing of the asphalt and the fibers.

[0036] The working process of the present invention is as follows: Put the fibers to be mixed into the material pipe 2, seal the material pipe 2 through the pipe plug 22, clamp the upper end of the material pipe 2 through the clamping mechanism 6 on the clamping rod 3, lower the hydraulic telescopic rod, and insert the material pipe 2 into the asphalt in the material box. When the material pipe 2 is inserted to the bottom of the asphalt, the hydraulic telescopic rod stops telescoping, the air compressor is turned on, and the gas is blown into the material pipe 2 through the air inlet pipe 21. When the pressure sensor 8 on the bottom cover 51 senses a certain pressure, the pressure sensor 8 controls the motor 53 to turn on through the processor 9. The motor 53 drives the bottom cover 51 to rotate a certain angle, so that the cover hole 511 on the bottom cover 51 is aligned with the discharge hole 521 on the pipe bottom. The processor 9 controls the motor 53 to stop working. At this time, the fibers in the material pipe 2 fall into the interior of the asphalt under the impact of the air flow. The hydraulic telescopic rod starts, drives the material pipe 2 to slowly rise inside the asphalt. Under the flow of the asphalt, the surrounding asphalt flows towards the middle depression and wraps the fallen fibers, thus achieving the effect of uniform mixing of the fibers and the asphalt. When the material pipe 2 is about to separate from the asphalt, the air compressor is turned off, and the hydraulic telescopic rod drives the material pipe 2 to continue to rise until the material pipe 2 separates from the asphalt. Pull out the pipe plug 22 of the material pipe 2, fill in the fibers, and continue to cycle the above steps. The mixing device of the fiber-modified asphalt concrete is simply arranged and convenient to operate and use. By blowing the fibers in the material pipe 2 into the interior of the asphalt through the air compressor, the dispersibility and uniformity of the fibers in the asphalt are improved, the probability of the fibers climbing the rod and winding around the axis can be reduced, and it is beneficial to improve the fiber dispersion rate.

[0037] Those skilled in the art will appreciate that although the preferred embodiments of the present invention have been described, additional changes and modifications can be made to these embodiments once the basic creative concept is known to those skilled in the art. Therefore, the appended claims are intended to be construed to include the preferred embodiments as well as all changes and modifications that fall within the scope of the present invention. Obviously, those skilled in the art can make various changes and variations to the present invention without departing from the spirit and scope of the present invention. Thus, if these modifications and variations of the present invention fall within the scope of the claims of the present invention and their equivalent technologies, the present invention is also intended to include these modifications and variations.

Claims

1. A method for mixing fiber-modified asphalt, characterized in that, It includes a mixing device for fiber-modified asphalt. The mixing device includes a material storage barrel (1), a material pipe (2), a clamping rod (3), a blowing assembly, and a lifting assembly (4). The material storage barrel (1) is used to hold asphalt. The material pipe (2) is located above the material storage barrel (1). The top end of the material pipe (2) is connected to the clamping rod (3). An inner cavity for holding fibers is provided inside the material pipe (2). The top end of the material pipe (2) is externally connected to the blowing assembly through an air inlet pipe (21). The bottom end of the material pipe (2) faces the upper opening of the material storage barrel (1). A bottom plate (52) is coaxially and fixedly arranged at the bottom end of the material pipe (2), and a plurality of discharge holes (521) are uniformly and penetratingly formed in the bottom plate (52). A switch assembly (5) for opening and closing the discharge holes (521) is provided at the bottom end of the material pipe (2). The lifting assembly (4) is used to drive the clamping rod (3) to vertically lift and lower. The method includes: S01. Put the fibers to be mixed into the material pipe (2), and drive the clamping rod (3) to descend so that the bottom end of the material pipe (2) is inserted into the asphalt in the lower material storage barrel (1). S02. Turn on the blowing assembly and the switch assembly (5), and blow air from the material pipe (2) into the asphalt. S03. Drive the clamping rod (3) and the material pipe (2) to gradually draw out of the asphalt upward through the lifting assembly (4). S04. When the material pipe (2) is about to separate from the asphalt, the blowing assembly is closed, and the material pipe (2) continues to rise until it separates from the asphalt. S05. Repeat steps S01 - S04 several times.

2. The mixing method of a fiber-modified asphalt according to claim 1, characterized in that, The blowing assembly is an air compressor, and the air outlet end of the air compressor is connected to the top end of the material pipe (2) through the air inlet pipe (21).

3. A method for mixing fiber-modified asphalt according to claim 1, characterized in that The lifting assembly (4) includes a base (41) and a support rod (42). The base (41) is arranged on one side of the material storage barrel (1). The support rod (42) is a hydraulic telescopic rod. One end of the support rod (42) is vertically and fixedly connected to the support rod (42), and the other end is fixedly connected to the clamping rod (3).

4. A method for mixing fiber-modified asphalt according to claim 1, characterized in that A plurality of the material pipes (2) are provided, and the plurality of material pipes (2) are horizontally arranged at intervals on the clamping rod (3).

5. A method for mixing fiber-modified asphalt according to claim 4, characterized in that, A plurality of clamping mechanisms (6) are horizontally arranged at intervals on the clamping rod (3), and the material pipe (2) is detachably connected to the clamping rod (3) through the clamping mechanism (6).

6. The mixing method of a fiber-modified asphalt according to claim 5, characterized in that, The clamping mechanism (6) includes two elastic cross bars (61). The same-side ends of the two elastic cross bars (61) are fixedly connected to the clamping rod (3). A plurality of concave portions for fitting the outer wall of the material pipe (2) are arranged at intervals on the mutually approaching surfaces of the two elastic cross bars (61). Screws (62) and nuts (63) are provided on both sides of each concave portion on the elastic cross bar (61), and the two elastic cross bars (61) are clamped to the material pipe (2) by screwing the screws (62) and nuts (63).

7. A mixing method of fiber-modified asphalt according to claim 1, characterized in that A heating mechanism (7) for heating the asphalt in the material storage barrel (1) is arranged at the bottom of the material storage barrel (1), and the heating mechanism (7) is a resistance wire.

8. A method for mixing fiber-modified asphalt according to claim 1, characterized in that, A pipe plug (22) is detachably arranged at the top of the material pipe (2), and the air inlet pipe (21) is connected to the pipe plug (22).

9. A method for mixing fiber-modified asphalt according to any one of claims 1 to 8, characterized in that, The switch assembly (5) includes a bottom cover (51) and a motor (53). The bottom cover (51) is attached to the bottom plate (52), and the bottom cover (51) is rotatably connected to the bottom plate (52) coaxially. A plurality of cover holes (511) are uniformly formed through the bottom cover (51). The discharge holes (521) on the bottom plate (52) correspond to the cover holes (511) on the bottom cover (51) one by one. The motor (53) is used to drive the bottom cover (51) to rotate.

10. A method for mixing fiber-modified asphalt according to claim 9, characterized in that, A pressure sensor (8) is arranged in the material pipe (2). The pressure sensor (8) is electrically connected to the motor (53). The pressure sensor (8) is used to detect the pressure in the material pipe (2). When the pressure sensor (8) detects that the pressure in the material pipe (2) reaches the set value, the motor (53) starts and drives the bottom cover (51) to rotate until the discharge hole (521) on the bottom plate (52) is aligned with the cover hole (511) on the bottom cover (51).

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