A mixing method for fiber-modified asphalt

Abstract

The present invention provides a mixing device for fiber-modified asphalt, which belongs to the technical field of asphalt modification. It includes a base, a bracket, a material box and a material pipe. The material box is arranged on the base and is used to hold asphalt. The bracket is fixedly arranged on the base and the top of the bracket has a top plate extending to the top of the material box. The material pipe is arranged between the bracket and the material box. The bracket is provided with a driving member for driving the material pipe to rise and fall. The top of the material pipe is connected to an air compressor through a pipeline. The interior of the material pipe is hollow and is used to place fibers. The bottom of the material pipe is provided with a switch assembly for opening and closing the bottom opening of the pipeline. The air compressor inflates the material pipe, pushes the bottom cover to open, and blows the fibers into the asphalt. During the slow lifting process of the material pipe, the asphalt around the material pipe flows and wraps the fallen fibers, thereby improving the dispersion and uniformity of the fibers in the asphalt, reducing the probability of the fibers climbing the rod and wrapping around the axis, and helping to improve the fiber dispersion rate.

Description

Technical Field

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

[0002] Fiber-modified asphalt refers to asphalt that has fiber materials added to it. This addition improves its thermal stability, low-temperature crack resistance, durability, and tensile strength. Traditionally, fiber-modified asphalt is produced by mixing the fibers and asphalt together in a blender. However, because the fibers do not dissolve in asphalt and have a large aspect ratio, they tend to climb around the asphalt shaft during conventional high-speed mixing, resulting in low dispersion efficiency and poor dispersion uniformity.

[0003] To address this issue, there is currently a method of blowing fibers onto the asphalt surface through an air compressor and an air supply mechanism, and then mixing them through a mixing device. For example, the Chinese invention patent application with publication number CN113355977A discloses a mixing device and mixing method for fiber-modified asphalt concrete, in which a mixing mechanism is provided directly above the material barrel. The mixing mechanism includes an upper frame and a reciprocating telescopic mechanism mounted on the upper frame. The telescopic end of the reciprocating telescopic mechanism faces vertically downward and directly toward the opening of the material barrel. A mixing head is mounted on the telescopic end of the reciprocating telescopic mechanism, so that the mixing head can be axially extended into and out of the material barrel under the action of the reciprocating telescopic mechanism to mix the asphalt in the material barrel. The fiber-modified asphalt concrete mixing device of this invention has the advantages of reducing the probability of the fiber climbing the rod around the axis and improving the fiber dispersion rate.

[0004] However, this method leaves most of the fibers on the surface of the asphalt, making it difficult for them to penetrate deeply into the asphalt through the mixing mechanism. Consequently, the dispersion and uniformity of the fibers in the asphalt remain uncertain. Therefore, to obtain high-performance modified asphalt, the problem of uniform fiber dispersion in the asphalt must be addressed. The key lies in finding a method to effectively improve the dispersion of fibers in asphalt. Summary of the Invention

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

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

[0007] A mixing method for fiber-modified asphalt is provided, comprising a base, a bracket, a material box and a material pipe, wherein the material box is arranged on the base and is used to hold asphalt, the bracket is fixedly arranged on the base and the top of the bracket has a top plate extending to above the material box, the material pipe is arranged between the bracket and the material box, the bracket is provided with a driving member for driving the material pipe to rise and fall, the top end of the material pipe is connected to an external air compressor through a pipeline, the interior of the material pipe is hollow and is used to place fibers, and the bottom of the material pipe is provided with a switch assembly for opening and closing the opening at the bottom end of the material pipe.

[0008] Furthermore, the switch assembly includes a spring and a bottom cover. The bottom cover is coaxially slidably arranged at the bottom of the material tube along the axial direction of the material tube. One end of the spring is connected to the material tube and the other end is connected to the bottom cover. The spring is used to drive the bottom cover to move toward the material tube and close the opening at the bottom end of the material tube.

[0009] Furthermore, a clamping assembly is provided between the bracket and the material box, and the clamping assembly includes a disc and a locking bolt. The disc is provided with a plurality of plug holes adapted to the size of the material pipe, and a threaded hole connected to the plug hole is horizontally provided on the side wall of the disc. The locking bolt is threadedly connected in the threaded hole and abuts against the outer wall of the material pipe inserted in the plug hole.

[0010] Furthermore, the driving component is a hydraulic cylinder, which is vertically fixed on the top plate of the bracket, and the piston rod of the hydraulic cylinder is connected to the disc.

[0011] Furthermore, a pipe plug is detachably provided on the top of the material pipe, and a pipe for connecting to an external air compressor is provided on the pipe plug.

[0012] Furthermore, a heating element is provided at the bottom of the material holding box, and the heating element is an electric heating wire.

[0013] The beneficial effects of the present invention are:

[0014] 1. The installation structure of the mixing device is simple. By inserting the material pipe into the asphalt, air is ventilated into the asphalt to increase the fluidity of the asphalt, and air is blown into the material pipe through the air compressor, when the pressure in the material pipe reaches a level that can overcome the elastic force of the spring, the bottom cover at the bottom of the material pipe is automatically opened, and the fiber in the material pipe is blown into the asphalt. There is no need for staff to operate to open the material pipe. It is easy to operate and can effectively prevent asphalt from entering the material pipe and hindering the normal blowing of the fiber from the material pipe.

[0015] 2. When blowing fibers into the asphalt, slowly lift the material pipe upwards, so that the asphalt around the bottom opening of the material pipe can explore inward under the action of gravity, thereby wrapping the fibers in the air cavity blown out of the material pipe, improving the dispersion and uniformity of the fibers in the asphalt, reducing the probability of the fibers climbing the rod and wrapping around the axis, and helping to improve the fiber dispersion rate. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1This is a schematic diagram of the overall structure of the fiber-modified asphalt mixing device of an embodiment of the present application.

[0017] Figure 2 This is a schematic diagram of the detailed structure of the material tube of an embodiment of the present application.

[0018] Among them, 1. Base; 2. Bracket; 3. Material box; 4. Material pipe; 41. Pipe plug; 42. Pipe; 5. Switch assembly; 51. Spring; 52. Bottom cover; 6. Clamping assembly; 61. Disc; 62. Locking bolt; 7. Hydraulic cylinder; 8. Heating element. DETAILED DESCRIPTION

[0019] In order to better understand the above technical solution, the above technical solution will be described in detail below with reference to the accompanying drawings and specific implementation methods.

[0020] The present application discloses a method for mixing fiber-modified asphalt, referring to Figure 1 , comprising a base 1, a bracket 2, a material storage box 3 and a material pipe 4. The material storage box 3 is placed on the base 1 and is used to store the asphalt to be mixed. The bracket 2 is L-shaped and is vertically fixedly connected to one side edge of the base 1. The top of the bracket 2 extends upward from the material storage box 3 as a top plate. A clamping assembly 6 for clamping the material pipe 4 is provided between the bracket 2 and the material storage box 3. There may be multiple material pipes 4. A driving member is provided on the top plate of the bracket 2. The driving member is connected to the clamping assembly 6 to drive the clamping assembly 6 and the multiple material pipes 4 clamped therein to vertically rise and fall. The material pipe 4 is a pipe 42 that is hollow inside and passes through at least the bottom. Fibers can be placed in the cavity inside the material pipe 4. The top end of the material pipe 4 is connected to the pipe 42, which is externally connected to an air compressor. The bottom end of the material pipe 4 is provided with a switch assembly 5 for opening and closing the bottom end opening of the material pipe 4.

[0021] When mixing fibers into the asphalt in the material box 3, first fill each material pipe 4 with fibers, then use the driving member to drive the material pipe 4 to insert into the asphalt in the material box 3, then use the air compressor to blow air into the material pipe 4, and open the switch assembly 5 at the bottom of the material pipe 4 to blow the fibers in the material pipe 4 into the asphalt. The fibers in the material pipe 4 fall into the asphalt under the impact of the air flow, and the driving member then pulls the material pipe 4 out of the asphalt slowly. The material pipe 4 slowly rises inside the asphalt. Under the flow of asphalt, the surrounding asphalt flows to the central depression and wraps up the fallen fibers, thereby achieving the effect of uniform mixing of the fibers and asphalt.

[0022] Reference Figure 2The bottom cover 52 is fixedly connected to the outer wall of the material tube 4 and the bottom cover 52 is fixedly connected to the bottom wall of the material tube 4.

[0023] The clamping assembly 6 includes a disc 61 and a locking bolt 62. The disc 61 is provided with a plurality of plug holes adapted to the size of the material tube 4. A threaded hole connected to the plug hole is horizontally provided on the side wall of the disc 61. The locking bolt 62 is threadedly connected in the threaded hole and abuts against the outer wall of the material tube 4 inserted in the plug hole.

[0024] In the embodiment of the present application, the driving member can be a hydraulic cylinder 7, the cylinder body of the hydraulic cylinder 7 is vertically fixed to the top plate of the bracket 2 by bolts, and the piston rod of the hydraulic cylinder 7 is connected to the disc 61. In other embodiments, the driving member can also be a pneumatic cylinder or an electric push rod.

[0025] Furthermore, a heating device is provided at the bottom of the container 3. The heating device can be a common heating device such as a resistance wire. The heating device heats the asphalt. Since the heated asphalt has viscosity and fluidity, it is easy to mix the asphalt with the fiber.

[0026] Furthermore, the top of the material pipe 4 is through-set, and a pipe plug 41 is detachably provided on the top of the material pipe 4. The pipe plug 41 can be threadedly connected to the top opening of the material pipe 4. A pipe 42 for an external air compressor is passed through the pipe plug 41. When the pipe plug 41 is installed on the material pipe 4, the pipe 42 is connected to the inside of the material pipe 4.

[0027] The principle of a fiber-modified asphalt mixing method according to an embodiment of the present application is as follows: the fibers to be mixed are placed into a feed pipe 4, which is sealed with a pipe plug 41. The upper end of the feed pipe 4 is clamped by a clamping device, and a hydraulic cylinder 7 is lowered to insert the feed pipe 4 into the asphalt in the feed tank 3. When the feed pipe 4 reaches the bottom of the asphalt, the hydraulic cylinder 7 stops extending and retracting, and the air compressor is turned on, blowing air into the feed pipe 4 through the air intake pipe. When the air pressure in the feed pipe 4 increases to a certain level, the pressure inside the feed pipe 4 causes the spring 51 to extend, and the bottom cover 52 is released from the lower end of the feed pipe 4, and the fibers in the feed pipe 4 are blown out along the surrounding gaps. At this point, the fibers in the feed pipe 4 are impacted by the air flow and fall into the asphalt. The hydraulic cylinder 7 is activated, causing the feed pipe 4 to slowly rise within the asphalt. Under the flow of asphalt, the surrounding asphalt flows into the central depression, enveloping the fallen fibers, thereby achieving a uniform mixing effect between the fibers and the asphalt. When the feed pipe 4 is about to separate from the asphalt, the air compressor is turned off, spring 51 returns to its initial state, and the bottom cover 52 is pulled into the lower opening of the feed pipe 4, making it close to the asphalt, returning the feed pipe 4 to a sealed state. The hydraulic cylinder 7 then drives the feed pipe 4 to continue rising until the feed pipe 4 separates from the asphalt. The pipe plug 41 of the feed pipe 4 is then removed, and the fiber is filled in, and the above steps are repeated. The mixing device for fiber-modified asphalt concrete is simple to set up and easy to operate. The air compressor blows the fibers from the feed pipe 4 into the asphalt, improving the dispersion and uniformity of the fibers in the asphalt, reducing the probability of the fibers climbing the rod and wrapping around the axis, and thus improving the fiber dispersion rate.

[0028] Those skilled in the art will appreciate that while preferred embodiments of the present invention have been described, further variations and modifications may be made to these embodiments once those skilled in the art are aware of the underlying inventive concepts. Therefore, the appended claims are intended to be interpreted as encompassing the preferred embodiments and all variations and modifications that fall within the scope of the present invention. Clearly, those skilled in the art may make various changes and modifications to the present invention without departing from the spirit and scope of the present invention. Thus, the present invention is intended to encompass such modifications and variations as fall within the scope of the claims and their equivalents.

Claims

1. A mixing method for fiber-modified asphalt, characterized in that: A fiber-modified asphalt mixing device is provided, comprising a base (1), a bracket (2), a material storage box (3) and a material pipe (4); the material storage box (3) is arranged on the base (1) and is used to store asphalt; the bracket (2) is fixedly arranged on the base (1) and the top of the bracket (2) has a top plate extending to above the material storage box (3); the material pipe (4) is arranged between the bracket (2) and the material storage box (3); a driving member for driving the material pipe (4) to rise and fall is provided on the bracket (2); the top end of the material pipe (4) is connected to an air compressor via a pipe (42); the interior of the material pipe (4) is hollow and is used to place fibers; the bottom of the material pipe (4) is provided with a switch assembly (5) for opening and closing the bottom opening of the material pipe (4); The method comprises: S01, placing fibers to be mixed into a material pipe (4), driving the material pipe (4) downward, and inserting the material pipe (4) into the asphalt in the material container (3); S02, turning on the air compressor to inflate the material pipe (4), and turning on the switch assembly (5); S03, slowly pulling the material pipe (4) out of the asphalt through the driving member, and the asphalt flows to the concave portion at the bottom of the material pipe (4) and wraps the fibers; S04: When the material pipe (4) is about to separate from the asphalt, the air compressor and the switch assembly (5) are turned off, and the material pipe (4) continues to rise until it separates from the asphalt; S05. Repeat steps S01-S04 several times.

2. The mixing method of fiber-modified asphalt according to claim 1, characterized in that: The switch assembly (5) comprises a spring (51) and a bottom cover (52). The bottom cover (52) is coaxially slidably arranged at the bottom of the material tube (4) along the axial direction of the material tube (4). One end of the spring (51) is connected to the material tube (4) and the other end is connected to the bottom cover (52). The spring (51) is used to drive the bottom cover (52) to move toward the material tube (4) and close the opening at the bottom end of the material tube (4).

3. The mixing method of fiber-modified asphalt according to claim 1, characterized in that: A clamping assembly (6) is provided between the bracket (2) and the material container (3), and the clamping assembly (6) includes a disc (61) and a locking bolt (62). The disc (61) is provided with a plurality of plug holes adapted to the size of the material tube (4). A threaded hole communicating with the plug holes is horizontally provided on the side wall of the disc (61). The locking bolt (62) is threadedly connected in the threaded hole and abuts against the outer wall of the material tube (4) inserted in the plug hole.

4. The mixing method of fiber-modified asphalt according to claim 3, characterized in that: The driving member is a hydraulic cylinder (7), which is vertically fixed on the top plate of the bracket (2), and the piston rod of the hydraulic cylinder (7) is connected to the disc (61).

5. The mixing method of fiber-modified asphalt according to claim 1, characterized in that: A pipe plug (41) is detachably provided on the top of the material pipe (4), and a pipe (42) for connecting to an external air compressor is provided on the pipe plug (41).

6. The mixing method of fiber-modified asphalt according to claim 1, characterized in that: A heating element (8) is provided at the bottom of the material holding box (3), and the heating element (8) is an electric heating wire.

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