Bituminous mixture mixing and heating equipment and method

Abstract

The invention relates to asphalt mixture mixing and heating equipment and method in the technical field of asphalt mixture preparation, and the asphalt mixture mixing and heating equipment comprises a plurality of drying cylinders which are used for receiving different aggregates and respectively heating and drying the corresponding aggregates; the asphalt heater is used for receiving the asphalt and heating the asphalt; and the mixer is internally provided with microwave heating equipment, the microwave heating equipment is used for heating the asphalt, and the mixer is used for mixing the asphalt and the aggregates. According to the asphalt mixture mixing and heating equipment and the asphalt mixture mixing and heating method, the quality and the performance of the asphalt mixture can be ensured while the energy consumption of preparation of the asphalt mixture is reduced.

Description

Technical Field

[0001] The present application relates to the technical field of asphalt mixture preparation, and in particular to an asphalt mixture mixing and heating device and method. Background Art

[0002] Traditional hot mix asphalt technology is the most widely used asphalt production technology with good road performance. It has made great contributions to the development of modern road traffic. However, its emissions under high temperature conditions seriously endanger people’s lives and property safety. The higher construction temperature will consume a lot of energy, generate a lot of dust and exhaust gas, cause environmental pollution, affect the health of construction workers, and is not in line with the concept of sustainable development.

[0003] Although warm-mix asphalt technology can reduce construction energy consumption and reduce gas emissions, the production and processing costs of warm-mix asphalt are higher than those of traditional hot-mix asphalt pavement, and its construction costs are also relatively high, which limits the promotion and application of warm-mix asphalt and makes it only used in some areas. Warm-mix asphalt also has certain defects: (1) Poor crack resistance: Compared with hot-mix asphalt pavement, warm-mix asphalt's crack resistance is slightly inferior, mainly manifested in the tendency to crack under relatively bad weather conditions; (2) High pavement hardness: Compared with other pavements, warm-mix asphalt pavement has a higher hardness and is prone to rutting, making it unsuitable for use in special sections such as large tunnels and bridges; (3) Faster aging: Compared with hot-mix asphalt pavement, warm-mix asphalt pavement ages faster and usually needs to be repaired or replaced every 8-10 years.

[0004] To this end, the present invention is proposed. Summary of the invention

[0005] In view of the problems existing in the background technology, the present application provides an asphalt mixture mixing heating device and method, which can reduce the energy consumption of asphalt mixture preparation while ensuring the quality and performance of the asphalt mixture.

[0006] According to one aspect of the present invention, there is provided an asphalt mixture mixing and heating device, comprising: a plurality of drying drums, the plurality of drying drums being used to receive different aggregates and respectively heat and dry the corresponding aggregates; an asphalt heater, the asphalt heater being used to receive and heat the asphalt; a mixer, the mixer being equipped with a microwave heating device, the microwave heating device being used to heat the asphalt, and the mixer being used to mix the asphalt and the aggregates.

[0007] In some embodiments of the present invention, the mixer uses ceramic stirring blades for mixing and stirring.

[0008] In some embodiments of the present invention, the asphalt mixture mixing and heating equipment further comprises: a hot hopper, wherein the hot hopper is used to temporarily store aggregates dried by the drying drum.

[0009] In some embodiments of the present invention, the asphalt mixture mixing and heating equipment also includes a feeding hopper, a cold hopper and a vibrating screening device. Each aggregate is input into the cold hopper through the feeding hopper, and then screened by the vibrating screening device, and each aggregate enters the corresponding drying drum.

[0010] According to another aspect of the present invention, there is provided a method for heating an asphalt mixture, comprising the following steps:

[0011] Aggregates of different specifications are fed into different drying drums, where hot air heats the aggregates to a certain temperature.

[0012] Sending the asphalt to the asphalt heater to heat it to liquid state;

[0013] Then the asphalt and various aggregates are fed into the mixer in a certain proportion. The asphalt is heated by microwaves to ensure its fluidity. The stirring blades in the mixer mix the asphalt and various aggregates evenly to form an asphalt mixture.

[0014] In some embodiments of the present invention, in the drying drum, the hot air heats the aggregate to 115-125°C.

[0015] In some embodiments of the present invention, in the drying drum, the hot air heats the aggregate to 120±2°C.

[0016] In some embodiments of the present invention, in the asphalt heater, the asphalt heating temperature is 140°C to 160°C.

[0017] The embodiment of the present application provides an asphalt mixture mixing and heating device and method. The asphalt mixture mixing and heating device and method adopt a microwave heating device to heat the asphalt by microwaves to ensure its fluidity. Wear-resistant ceramic stirring blades are used in the mixer to mix and stir the asphalt and various aggregates evenly to form an asphalt mixture. Compared with the hot mix asphalt technology, the aggregates of the present invention do not need to be heated to 170-180°C, but only need to be heated to about 120°C, which greatly saves energy consumption. Compared with the warm mix method, the present invention belongs to a hot mix technology with a relatively high heating temperature, which can ensure or even improve the quality and performance of the asphalt mixture, and the equipment cost investment is low, which effectively reduces the cost. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Various other advantages and benefits will become apparent to those of ordinary skill in the art by reading the detailed description of the preferred embodiments below. The accompanying drawings are only for the purpose of illustrating the preferred embodiments and are not to be considered as limiting the present application. Also, the same reference symbols are used throughout the accompanying drawings to represent the same components. In the accompanying drawings:

[0019] Figure 1 It is a structural schematic diagram of the asphalt mixture mixing and heating equipment of the present invention.

[0020] The reference numerals in the accompanying drawings represent the following: 1. drying drum; 2. asphalt heater; 3. mixer; 4. hot hopper; 5. cold hopper; 6. vibration screening device; 7. asphalt storage tank. DETAILED DESCRIPTION

[0021] It should be clear that the described embodiments are only part of the embodiments of the present application, rather than all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in the field without creative work are within the scope of protection of the present application.

[0022] When the following description refers to the drawings, unless otherwise indicated, the same numbers in different drawings represent the same or similar elements. The embodiments described in the following exemplary embodiments do not represent all embodiments consistent with the present application. Instead, they are only examples of devices and methods consistent with some aspects of the present application as detailed in the attached claims.

[0023] In the description of the present application, it should be understood that the terms "first", "second", etc. are used for descriptive purposes only and should not be understood as indicating or implying relative importance. For those of ordinary skill in the art, the specific meanings of the above terms in the present application can be understood according to the specific circumstances. In addition, in the description of the present application, unless otherwise specified, "multiple" refers to two or more. "And / or" describes the association relationship of associated objects, indicating that three relationships may exist. For example, A and / or B can represent: A exists alone, A and B exist at the same time, and B exists alone. The character " / " generally indicates that the objects associated before and after are in an "or" relationship.

[0024] Compared with traditional hot-mix asphalt technology, warm-mix asphalt technology can reduce construction energy consumption and gas emissions. However, warm-mix asphalt not only has poor crack resistance, high pavement hardness, and rapid aging, but also has the following defects: (1) High requirements for material quality. During the production, processing and construction of warm-mix asphalt, high requirements for material quality are required. If the quality of raw materials does not meet the standards, the performance of the pavement after construction will be affected, and even more serious problems will occur. (2) Professional processing and construction equipment is required. Since the production, processing and construction process of warm-mix asphalt are relatively complicated, professional processing and construction equipment are required. The cost of these equipment is high, which brings certain economic pressure to construction companies. (3) Difficulty in construction. The construction of warm-mix asphalt is relatively difficult and requires professional construction technology and technical methods. Otherwise, it may lead to poor pavement quality, easy cracking, easy aging and other problems. (4) High cost. Compared with traditional hot-mix asphalt pavement, the production and processing cost of warm-mix asphalt is relatively high, and its construction cost is also relatively high, which makes the promotion and application of warm-mix asphalt subject to certain restrictions and is only used in some areas.

[0025] The present application embodiment discloses an asphalt mixture mixing and heating device. Figure 1 As shown, the asphalt mixture mixing and heating equipment includes a plurality of drying drums 1, an asphalt heater 2 and a mixer 3.

[0026] Among them, multiple drying drums 1 are used to receive different aggregates and heat and dry the corresponding aggregates respectively; the asphalt heater 2 is used to receive asphalt and heat the asphalt; the mixer 3 is installed with a microwave heating device, the microwave heating device is used to heat the asphalt, and the mixer 3 is used to mix the asphalt and various aggregates.

[0027] It should be noted that aggregates include but are not limited to coarse aggregates, fine aggregates and mineral powder, etc. It should be understood that the number of drying drums 1 can be selected according to the type of aggregates, such as 2, 3, 4, etc. There is no specific requirement, and those skilled in the art can make reasonable choices based on actual needs.

[0028] By using the asphalt mixture mixing and heating equipment in the technical scheme, first, aggregates of different specifications are respectively sent to different drying drums 1, in which the hot air heats the aggregates to a certain temperature, and at the same time removes moisture and impurities in the aggregates to ensure the quality and dryness of the aggregates, and the asphalt is sent to the asphalt heater 2 to be heated to a liquid state; then the asphalt and the aggregates are sent to the mixer 3 in a certain proportion, and the asphalt is heated by microwaves to ensure its fluidity. The stirring blades in the mixer 3 mix the asphalt and the aggregates evenly to form an asphalt mixture. The fluidity of the asphalt is ensured by adopting a microwave heating device. Compared with the hot mix asphalt technology, the aggregates of the present invention do not need to be heated to 170-180°C, but only need to be heated to about 120°C, which greatly saves energy consumption. Compared with the warm mix method, the present invention belongs to a hot mix technology with a relatively high heating temperature, which can ensure or even improve the quality and performance of the asphalt mixture, and the equipment cost investment is low, which effectively reduces the cost.

[0029] In some embodiments of the present invention, the microwave heating devices are evenly arranged in two rows on the top of the mixer 3, with three microwave heating devices arranged in each row, for a total of six microwave heating devices.

[0030] In some embodiments of the present invention, the mixer 3 uses ceramic stirring blades for mixing and stirring, and the ceramic stirring blades are preferably made of zirconium oxide (ZrO2) ceramic material.

[0031] In this embodiment, aggregate and asphalt are stirred and mixed by using wear-resistant ceramic stirring blades, which have the characteristics of anti-magnetic and electrical insulation, wear resistance and corrosion resistance, oil-free self-lubrication, high temperature resistance and high cold resistance, and can be used in extremely harsh environments and special working conditions. It not only has a long service life, but also has high stirring and mixing efficiency, which can further reduce energy consumption and improve the quality and performance of asphalt mixture.

[0032] In some embodiments of the present invention, Figure 1 As shown, the asphalt mixture mixing and heating equipment further includes a hot hopper 4 , which is used to temporarily store aggregates dried by the drying drum 1 .

[0033] It should be noted that the number of hot hoppers 4 can be selected according to the type of aggregate, such as 2, 3, 4, etc. There is no specific requirement, and those skilled in the art can make a reasonable choice based on actual needs.

[0034] In this embodiment, the aggregate dried by the drying drum 1 is temporarily stored in the hot hopper 4, and the hot hopper 4 is used to keep the aggregate warm or even heat it in preparation for mixing with asphalt. This can maintain the temperature of the aggregate, reduce heat loss, and ensure the quality of the final mixture.

[0035] In some embodiments of the present invention, Figure 1As shown, the asphalt mixture mixing and heating equipment also includes a feeding hopper, a cold hopper 5 and a vibrating screening device 6. Each aggregate is input into the cold hopper 5 through the feeding hopper, and then screened by the vibrating screening device 6. Each aggregate enters the corresponding drying drum 1.

[0036] By using the feeding hopper, the cold hopper 5 and the vibrating screening device 6, continuous production can be ensured and materials that do not meet the specifications in the aggregate can be screened out, thereby further ensuring the quality and performance of the asphalt mixture.

[0037] In some embodiments of the present invention, Figure 1 As shown, the asphalt mixture mixing and heating equipment further includes an asphalt storage tank 7 , which is used to store asphalt. The asphalt is transported from the asphalt storage tank 7 to the asphalt heater 2 .

[0038] This embodiment also proposes an asphalt mixture mixing and heating method, which uses the above-mentioned asphalt mixture mixing and heating equipment to prepare asphalt mixture, and the asphalt mixture mixing and heating method includes the following steps:

[0039] (1) Aggregate drying: Aggregates of various specifications are fed into a cold hopper through a feeding hopper, and then screened by a vibrating screening device. Aggregates of different specifications enter different drying drums respectively. In the drying drum, hot air heats the aggregates to about 120°C, preferably to 115-125°C, such as 120±2°C, while removing moisture and impurities from the aggregates to ensure the quality and dryness of the aggregates. The dried aggregates enter a hot hopper to be mixed with asphalt.

[0040] (2) Asphalt heating: Asphalt is transported from asphalt storage tanks to asphalt heaters and heated to a liquid state to ensure the fluidity of the mixture. The heating temperature of asphalt needs to be between 140°C and 160°C. The specific heating temperature can be reasonably selected based on the type of asphalt and project requirements.

[0041] (3) Mixing and stirring: A microwave heating device is installed in the mixer of the mixing station, and wear-resistant ceramic stirring blades are used. Hot aggregate and asphalt enter the mixer in a certain proportion. The asphalt is heated by microwaves to ensure its fluidity. The stirring blades in the mixer mix the two evenly to form an asphalt mixture. The specific mixing time and temperature can be adjusted according to different asphalt types and engineering requirements.

[0042] The above is only a preferred specific embodiment of the present invention, but the protection scope of the present invention is not limited thereto. Any changes or substitutions that can be easily thought of by a person skilled in the art within the technical scope disclosed by the present invention should be included in the protection scope of the present invention. Therefore, the protection scope of the present invention shall be subject to the protection scope of the claims.

Claims

1. An asphalt mixture mixing and heating device, characterized in that: include: A plurality of drying drums, wherein the plurality of drying drums are used to receive different aggregates and heat and dry the corresponding aggregates respectively; An asphalt heater, the asphalt heater is used to receive asphalt and heat the asphalt; A mixer is provided with a microwave heating device for heating asphalt, and the mixer is used to mix the asphalt and various aggregates.

2. The asphalt mixture mixing and heating equipment according to claim 1, characterized in that: The mixer uses ceramic stirring blades for mixing and stirring.

3. The asphalt mixture mixing and heating equipment according to claim 1, characterized in that: Also includes: A hot hopper is used to temporarily store the aggregate dried by the drying drum.

4. The asphalt mixture mixing and heating equipment according to claim 1, characterized in that: It also includes a feeding hopper, a cold hopper and a vibration screening device. Each aggregate is input into the cold hopper through the feeding hopper, and then screened by the vibration screening device, and each aggregate enters the corresponding drying cylinder.

5. A method for heating asphalt mixture mixing, characterized in that: The following steps are involved: Aggregates of different specifications are fed into different drying drums, where hot air heats the aggregates to a certain temperature. Sending the asphalt to the asphalt heater to heat it to liquid state; Then the asphalt and various aggregates are fed into the mixer in a certain proportion. The asphalt is heated by microwaves to ensure its fluidity. The stirring blades in the mixer mix the asphalt and various aggregates evenly to form an asphalt mixture.

6. The asphalt mixture mixing and heating method according to claim 5, characterized in that: In the drying drum, hot air heats the aggregate to 115-125°C.

7. The asphalt mixture mixing and heating method according to claim 6, characterized in that: In the drying drum, hot air heats the aggregate to 120±2°C.

8. The asphalt mixture mixing and heating method according to claim 5, characterized in that: In the asphalt heater, the asphalt heating temperature is 140°C to 160°C.

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