Modified asphalt manufacturing equipment and preparation process

Abstract

The invention provides modified asphalt manufacturing equipment and a preparation process, and belongs to the technical field of road asphalt, the modified asphalt manufacturing equipment comprises a first stirring tank, a first grinding machine, a second stirring tank, a second grinding machine and a finished product tank, the discharging port of the first stirring tank is connected with the feeding port of the first grinding machine, and the discharging port of the second grinding machine is connected with the finished product tank; the first grinding machine is connected with a discharging port of the second stirring tank, a discharging port of the second stirring tank is connected with a feeding port of the second grinding machine, a discharging port of the second grinding machine is connected with a feeding port of the finished product tank, the first grinding machine is connected with a first storage tank, and the second grinding machine is connected with a second storage tank. The stirring motor is arranged on the stirring tank to drive the stirring shaft to rotate, the stirring blades on the stirring shaft and the connecting shaft rotate along with the stirring shaft and stir asphalt, meanwhile, the hanging brush assembly on the connecting shaft also rotates along with the stirring shaft, and the scraping plate on the hanging brush assembly firstly scrapes off the asphalt on the inner side wall of the tank body; and the bristles on the rear side of the scraping plate sweep the asphalt which is not scraped off, so that the asphalt on the inner side wall of the tank body can be scraped off.

Description

Technical Field

[0001] The present invention relates to the technical field of road asphalt, and particularly to a modified asphalt production device and a preparation process. Background Art

[0002] In the construction of highway asphalt pavements, in order to improve their physical and mechanical properties, various modified asphalt mixtures are used as the surface layer, that is, modifiers are incorporated into the asphalt. The purpose of asphalt modification is to improve the high-temperature stability, low-temperature crack resistance and anti-aging ability of asphalt concrete. Since modified asphalt needs to fully combine the required modifiers and the matrix asphalt body, the research and development focus of this product also has two parts. On the one hand, it is necessary to optimize the formula and production process of modified asphalt as much as possible; on the other hand, due to the high viscosity of asphalt, when using ordinary mixing equipment, the situation of sticking to the mixing equipment often occurs, so it is also necessary to carry out customized design and manufacturing. The inventor combines years of asphalt production experience, and through the research and development and transformation of related processes and equipment, a set of modified asphalt production process is perfected to solve the above technical problems. Summary of the Invention

[0003] The purpose of the present invention is to provide a modified asphalt production device and a preparation process to solve the existing technical problems.

[0004] In order to achieve the above purpose, the technical solution adopted by the present invention is as follows:

[0005] A modified asphalt production device includes a first mixing tank, a first grinder, a second mixing tank, a second grinder and a finished product tank. The discharge port of the first mixing tank is connected to the feed port of the first grinder, the discharge port of the first grinder is connected to the feed port of the second mixing tank, the discharge port of the second mixing tank is connected to the feed port of the second grinder, the discharge port of the second grinder is connected to the feed port of the finished product tank, the first grinder is connected to a first storage tank, and the second grinder is connected to a second storage tank.

[0006] Further, the first mixing tank includes a tank body. A mixing motor is arranged at the top of the tank body. The output end of the mixing motor is connected to a mixing shaft. A plurality of mixing blades are arranged on the mixing shaft. An inlet is arranged on one side of the top of the tank body. A discharge port is arranged at the bottom of the tank body, and the discharge port is communicated with the first grinder.

[0007] Further, a connecting shaft is arranged in the middle of the mixing shaft, and scraping assemblies are respectively arranged at both ends of the connecting shaft.

[0008] Further, each scraping assembly includes a fixing plate. One side of the fixing plate is connected to the connecting shaft, and a scraping plate and a brush are respectively arranged on the other side of the fixing plate.

[0009] Further, the first grinder includes a grinding body, a grinding disc, and a grinding motor. The grinding motor is disposed at the top of the grinding body. The output end of the grinding motor is connected to a rotating shaft, and one end of the rotating shaft is connected to a grinding roller. The grinding roller is disposed inside the grinding disc, and the grinding disc is connected to a hopper. The hopper is disposed at the upper end inside the grinding body.

[0010] A preparation process of modified asphalt includes the following steps:

[0011] (1) Put matrix asphalt, a modifier, and a concentrate into a first stirring tank and stir evenly to obtain a premix;

[0012] (2) Put the premix into a first grinder for grinding twice to obtain a ground premix;

[0013] (3) Put the ground premix and modified rubber powder into a second stirring tank and stir evenly to obtain a mixture;

[0014] (4) Put the mixture into a second grinder for primary grinding to obtain a primary ground mixture and store it in a second storage tank;

[0015] (5) After putting a stabilizer into the second storage tank, put it into the second grinder for re - grinding to obtain modified asphalt and store it in a finished product tank.

[0016] Further, in step (1), the modifier is SBS; the concentrate is composed of titanate, coupling agent, graphene sheets, and rubber oil.

[0017] Further, in step (2), the specific process of the first grinder for grinding twice is as follows: Put the premix into the first grinder for primary grinding to obtain a primary ground premix and store it in a first storage tank. After the primary grinding is completed, put the primary ground premix into the first grinder again for grinding to obtain a ground premix.

[0018] Further, in step (3), the modified rubber powder is composed of truck tire rubber powder, sulfur, naphthenic oil, silane KH - 550, antioxidant 4020, and nano - zinc oxide.

[0019] Further, in step (5), the stabilizer is composed of sulfur powder and a dispersant.

[0020] Due to the adoption of the above - mentioned technical solution, the present invention has the following beneficial effects:

[0021] 1. The manufacturing equipment of the present invention drives the stirring shaft to rotate by setting a stirring motor on the stirring tank. The stirring blades and connecting shafts on the stirring shaft rotate accordingly to stir the asphalt. At the same time, the hanging brush assembly on the connecting shaft also rotates accordingly. The scraper on the hanging brush assembly first scrapes off the asphalt on the inner side wall of the tank, and the bristles behind the scraper sweep the asphalt that has not been scraped off, ensuring that the asphalt on the inner side wall of the tank can be scraped and brushed off.

[0022] 2. In the preparation process of the present invention, the modifier, concentrated liquid, modified rubber powder and stabilizer are added and fused through two stirrings and multiple grindings, so that they are more completely compatible, and thus the prepared modified asphalt has low-temperature ductility and good stability.

[0023] 3. The main component of the modified rubber powder used in the modified asphalt prepared by the present invention is truck tire rubber powder, which belongs to waste recycling, and has simple operation and low cost.

[0024] 4. For the modified asphalt prepared by the present invention, a "double continuous network" is formed by the star-shaped structure of SBS and the broken elastomeric particles of the modified rubber powder. SBS provides rapid resilience, the modified rubber powder enhances the ability to resist permanent deformation through its high filling property, SBS promotes low-temperature ductility, and the modified rubber powder improves high-temperature stability. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] Figure 1 is a schematic diagram of the manufacturing equipment of the present invention;

[0026] Figure 2 is a cross-sectional view of the stirring tank of the present invention;

[0027] Figure 3 is a schematic structural diagram of the scraping and brushing assembly of the present invention;

[0028] Figure 4 is a cross-sectional view of the grinder of the present invention.

[0029] In the drawings, 1 - First stirring tank, 11 - Tank body, 12 - Stirring motor, 13 - Stirring shaft, 14 - Stirring blades, 15 - Feeding port, 16 - Discharging port, 17 - Connecting shaft, 18 - Scraping and brushing assembly, 181 - Fixed plate, 182 - Scraper, 183 - Brush, 2 - First grinder, 21 - Grinding body, 22 - Grinding disc, 23 - Grinding motor, 231 - First feeding port, 232 - Second feeding port, 233 - First discharging port, 234 - Second discharging port, 24 - Rotating shaft, 25 - Grinding roller, 26 - Connecting piece, 27 - Wear-resistant bushing, 28 - Hopper, 3 - Second stirring tank, 4 - Second grinder, 5 - Finished product tank, 6 - First storage tank, 7 - Second storage tank. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0030] To make the objectives, technical solutions and advantages of the present invention more clear and understandable, the following preferred embodiments are given with reference to the accompanying drawings to further elaborate on the present invention. However, it should be noted that many details listed in the specification are only for enabling the reader to have a thorough understanding of one or more aspects of the present invention, and these aspects of the present invention can be implemented even without these specific details.

[0031] As Figure 1 shown, a modified asphalt production device includes a first stirring tank 1, a first grinder 2, a second stirring tank 3, a second grinder 4 and a finished product tank 5. The discharge port of the first stirring tank 1 is connected to the feed port of the first grinder 2, the discharge port of the first grinder 2 is connected to the feed port of the second stirring tank 3, the discharge port of the second stirring tank 3 is connected to the feed port of the second grinder 4, and the discharge port of the second grinder 4 is connected to the feed port of the finished product tank 5. The first grinder 2 is connected to a first storage tank 6, and the second grinder 4 is connected to a second storage tank 7. The base asphalt, modifier and concentrate are put into the first stirring tank 1 and stirred evenly, then enter the first grinder 2, are initially ground in the first grinder 2 and then enter the first storage tank 6 for storage. After the initial grinding of the first grinder 2 is completed, the material in the first storage tank 6 enters the first grinder 2 for re-grinding, and the re-ground material enters the second stirring tank 3. Modified rubber powder is put into the second stirring tank 3, and after stirring in the second stirring tank 3, it enters the second grinder 4, is initially ground in the second grinder 4 and then enters the second storage tank 7 for storage. After the initial grinding of the second grinder 4 is completed, a stabilizer is put into the second storage tank 7, and the material in the second storage tank 7 enters the second grinder 4 for re-grinding, and the re-ground material enters the finished product tank 5 for storage; the first storage tank 6, the second storage tank 7 and the finished product tank 5 are prior arts.

[0032] As Figure 2As shown, the structures of the first mixing tank 1 and the second mixing tank 3 are the same. The first mixing tank 1 includes a tank body 11. A mixing motor 12 is arranged at the top of the tank body 11. The output end of the mixing motor 12 is connected to a mixing shaft 13. The mixing shaft 13 extends into the interior of the tank body 11. A plurality of mixing blades 14 are arranged on the mixing shaft 13. One side of the top of the tank body 11 is provided with a feeding port 15. The bottom of the tank body 11 is provided with a discharging port 16. The discharging port 16 is communicated with the first grinding machine 2. Valves are arranged on both the feeding port 15 and the discharging port 16. After the material enters the tank body 11 from the feeding port 15, the mixing motor 12 is started to drive the mixing shaft 13 to rotate. The mixing blades 14 rotate accordingly and stir the material. The evenly stirred material exits from the discharging port 16. A connecting shaft 17 is arranged in the middle of the mixing shaft 13. Scraping assemblies 18 are respectively arranged at both ends of the connecting shaft 17. The scraping assemblies 18 are used for scraping the material on the inner side wall of the tank body 11 to prevent the material from sticking to the inner side wall of the tank body 11.

[0033] As Figure 3 shown, the scraping assembly 18 includes a fixing plate 181. The fixing plate 181 is used for connecting with the connecting shaft 17 and also for installing a scraping plate 182 and a brush 183. One side of the fixing plate 181 is connected to the connecting shaft 17. The scraping plate 182 and the brush 183 are respectively arranged on the other side of the fixing plate 181. The scraping plate 182 and the brush 183 are respectively arranged on both sides of the same surface of the fixing plate 181. During operation, the scraping plate 182 is in the front and the brush 183 is in the back, so that the brush 183 sweeps the material that the scraping plate 182 has not scraped clean once to ensure that all the material on the inner side wall of the tank body 11 falls off.

[0034] As Figure 4 shown, the structures of the first grinding machine 2 and the second grinding machine 4 are the same. The first grinding machine 2 includes a grinding machine body 21, a grinding disc 22 and a grinding motor 23. The grinding motor 23 is arranged at the top end of the grinding machine body 21. The output end of the grinding motor 23 is connected to a rotating shaft 24. One end of the rotating shaft 24 is connected to a grinding roller 25. The grinding roller 25 is arranged inside the grinding disc 22. The grinding disc 22 is connected to a hopper 28. The hopper 28 is arranged at the upper end inside the grinding machine body 21. After the material enters the grinding machine body 21, it enters the grinding disc 22 along with the hopper 28. The grinding machine body 21 is started to drive the rotating shaft 24 to rotate. The rotating shaft 24 drives the grinding roller 25 to rotate and grind the material.

[0035] In an embodiment of the present invention, the grinding disc 22 is connected to the inner side wall of the grinding machine body 21 through a connecting member 26 to ensure the stability of the grinding disc 22 during operation. A wear-resistant bushing 27 is provided on the inner circumferential side wall of the grinding disc 22. The wear-resistant bushing 27 and the grinding disc 22 are provided as a detachable device. The wear-resistant bushing 27 can prevent the grinding disc 22 from being worn. After the wear-resistant bushing 27 is worn, a new one can be replaced for use, which is simple and convenient. A gap is provided between the grinding disc 22 and the grinding roller 25. The bottom of the grinding disc 22 is provided with a mesh structure so that the material can go out.

[0036] In an embodiment of the present invention, on both sides of the top end of the grinding machine body 21, a first feed inlet 231 and a second feed inlet 232 are respectively provided. The first feed inlet 231 is communicated with the discharge port 16 of the first stirring tank 1, and the second feed inlet 232 is communicated with the discharge port of the first storage tank 6. On both sides of the bottom end of the grinding motor 23, a first discharge port 233 and a second discharge port 234 are respectively provided. The first discharge port 233 is communicated with the feed inlet of the first storage tank 6, and the second discharge port 234 is communicated with the feed inlet of the second stirring tank 3. Valves are provided on the first feed inlet 231, the second feed inlet 232, the first discharge port 233, and the second discharge port 234. The material coming out of the discharge port 16 of the first stirring tank 1 enters the grinding machine body 21 through the first feed inlet 231 for primary grinding. The material after primary grinding enters the first storage tank 6 for storage. After the first grinder 2 finishes primary grinding, the material in the first storage tank 6 enters the grinding machine body 21 through the second feed inlet 232 for secondary grinding. The material after secondary grinding enters the second stirring tank 3.

[0037] A preparation process of modified asphalt includes the following steps:

[0038] (1) Put the matrix asphalt, modifier, and concentrated liquid into the first stirring tank and stir evenly to obtain a premixed material; the modifier is SBS; the concentrated liquid is composed of titanate, coupling agent, graphene sheets, and rubber oil;

[0039] The graphene sheets accelerate heat diffusion through their lamellar structure, reducing the temperature sensitivity of asphalt;

[0040] The rubber oil can promote the swelling of SBS and the surface activation of rubber powder, and at the same time adjust the system viscosity to avoid processing difficulties caused by a high filler content;

[0041] The specific preparation process of the concentrated liquid is as follows: dissolve titanate in water to obtain a titanate solution, grind graphene micro sheets into powder and then add them together with rubber oil into the titanate solution, and perform ultrasonic treatment in a magnetic field to obtain a graphene dispersion; then, under the action of an external magnetic field, subject the graphene dispersion to vacuum distillation to obtain the concentrated liquid.

[0042] (2) Put the premix into the first grinder for grinding twice to obtain the ground premix;

[0043] The specific process of the first grinder for grinding twice is as follows: Put the premix into the first grinder for primary grinding to obtain the primary ground premix and store it in the first storage tank. After the primary grinding is completed, put the primary ground premix into the first grinder again for grinding to obtain the ground premix.

[0044] (3) Put the ground premix and the modified rubber powder into the second stirring tank and stir evenly to obtain the mixture; The modified rubber powder is composed of truck tire rubber powder, sulfur, naphthenic oil, silane KH-550, antioxidant 4020, and nano-zinc oxide;

[0045] The specific preparation process of the modified rubber powder is as follows: First, the recycled truck tire rubber powder is magnetically separated to remove steel wires, vibration sieved to remove fibers, pickled (soaked in 5% dilute sulfuric acid for 30 minutes) and then washed with water until neutral, dried at 80°C until the moisture content is <0.5% to obtain purified rubber powder (80 mesh); Then, 100 parts of the purified rubber powder are placed in a high-speed mixer, preheated to 90°C, and 3-5 parts of naphthenic oil are sprayed and added, and mixed for 10 minutes to fully swell the rubber powder; Then, the swollen rubber powder is transferred to an internal mixer, and 0.5-1.5 parts of sulfur, 0.8-1.2 parts of silane KH-550, 0.3-0.5 parts of antioxidant 4020, and 1-2 parts of nano-zinc oxide are added in sequence. Ensure the completion of the sulfur cross-linking reaction through on-line viscosity monitoring, and the end point is when the viscosity increases by 15-20%; The temperature of the internal mixing is 135-145°C, the rotation speed is 60 rpm, and the mixing time is 8-12 minutes; Immediately after discharging, it enters a twin-screw extruder for low-temperature pelletizing (die head temperature 80°C), and is granulated by air cooling to obtain modified rubber powder particles with a particle size ≤2 mm. Finally, the finished product is vacuum-packed and stored to obtain;

[0046] In the above, nano-zinc oxide absorbs high-energy radiation as an ultraviolet shielding agent, and antioxidant 4020 captures free radicals. The two form a double protection, increasing the penetration retention rate after ultraviolet aging from 65% to 85%;

[0047] A moderate cross-linked layer is formed on the surface of the rubber powder through dynamic vulcanization of sulfur, which can not only prevent the light components in the asphalt from swelling the rubber powder excessively, but also provide an elastic stress buffer interface; Nano-zinc oxide and carbon black in the rubber powder act synergistically to form a heat conduction network, reducing the temperature sensitivity of the asphalt;

[0048] (4) Put the mixture into the second grinder for primary grinding to obtain the primary ground mixture and store it in the second storage tank;

[0049] (5) After adding the stabilizer into the second storage tank, put it into the second grinder for re-grinding to obtain modified asphalt and store it in the finished product tank; the stabilizer is composed of sulfur powder and a dispersant.

[0050] The above are only the preferred embodiments of the present invention. It should be noted that for those of ordinary skill in the art, without departing from the principle of the present invention, several improvements and refinements can be made, and these improvements and refinements should also be regarded as the protection scope of the present invention.

Claims

1. A modified asphalt production device, characterized in that: It includes a first stirring tank (1), a first grinder (2), a second stirring tank (3), a second grinder (4) and a finished product tank (5). The discharge port of the first stirring tank (1) is connected to the feed port of the first grinder (2), the discharge port of the first grinder (2) is connected to the feed port of the second stirring tank (3), the discharge port of the second stirring tank (3) is connected to the feed port of the second grinder (4), the discharge port of the second grinder (4) is connected to the feed port of the finished product tank (5), the first grinder (2) is connected to a first storage tank (6), and the second grinder (4) is connected to a second storage tank (7).

2. The modified asphalt production equipment according to claim 1, characterized in that: The first stirring tank (1) includes a tank body (11). A stirring motor (12) is arranged at the top of the tank body (11). The output end of the stirring motor (12) is connected to a stirring shaft (13). A plurality of stirring blades (14) are arranged on the stirring shaft (13). A feed port (15) is arranged on one side of the top of the tank body (11). A discharge port (16) is arranged at the bottom of the tank body (11), and the discharge port (16) is communicated with the first grinder (2).

3. The modified asphalt production equipment according to claim 2, characterized in that: A connecting shaft (17) is arranged in the middle of the stirring shaft (13), and scraping brush assemblies (18) are respectively arranged at both ends of the connecting shaft (17).

4. The modified asphalt production equipment according to claim 3, characterized in that: The scraping brush assembly (18) includes a fixing plate (181). One side of the fixing plate (181) is connected to the connecting shaft (17), and a scraping plate (182) and a brush (183) are respectively arranged on the other side of the fixing plate (181).

5. A modified asphalt production device according to claim 1, characterized in that: The first grinder (2) includes a grinding body (21), a grinding disc (22) and a grinding motor (23). The grinding motor (23) is arranged at the top end of the grinding body (21). The output end of the grinding motor (23) is connected to a rotating shaft (24). One end of the rotating shaft (24) is connected to a grinding roller 25. The grinding roller 25 is arranged inside the grinding disc (22). The grinding disc (22) is connected to a hopper (28), and the hopper (28) is arranged at the upper end inside the grinding body (21).

6. A preparation process of the modified asphalt according to any one of claims 1-5, characterized in that: It includes the following steps: (1) Put matrix asphalt, a modifier and a concentrate into the first stirring tank and stir evenly to obtain a premix; (2) Put the premix into the first grinder for grinding twice to obtain a ground premix; (3) Put the ground premix and modified rubber powder into the second stirring tank and stir evenly to obtain a mixture; (4) Put the mixture into the second grinder for primary grinding to obtain a primary ground mixture and store it in the second storage tank; (5) After putting a stabilizer into the second storage tank, put it into the second grinder for re-grinding to obtain modified asphalt and store it in the finished product tank.

7. A preparation process of modified asphalt according to claim 1, characterized in that: In step (1), the modifier is SBS; the concentrate is composed of titanate, coupling agent, graphene sheets and rubber oil.

8. A preparation process of modified asphalt according to claim 1, characterized in that: In step (2), the specific process of the first grinder for grinding twice is as follows: The premixed material is put into the first grinder for primary grinding to obtain the primary ground premixed material, which is stored in the first storage tank. After the primary grinding is completed, the primary ground premixed material is put into the first grinder again for grinding to obtain the ground premixed material.

9. A modified asphalt preparation process according to claim 1, characterized in that: In step (3), the modified rubber powder is composed of truck tire rubber powder, sulfur, naphthenic oil, silane KH-550, antioxidant 4020, and nano zinc oxide.

10. A modified asphalt preparation process according to claim 1, characterized in that: In step (5), the stabilizer is composed of sulfur powder and a dispersant.

Images