High-position hot melting RAP fine aggregate asphalt slurry preparing and adding device

Abstract

The invention discloses a high-position hot melting RAP fine aggregate asphalt mortar preparing and adding device which comprises an asphalt storage tank, the asphalt storage tank internally comprises an asphalt electric heating system, a large-particle aggregate filtering device, an asphalt mortar discharging system and an asphalt flue gas discharging device, and an asphalt stirring system comprises two sets of symmetrical four-group frequency conversion spiral stirrers. The asphalt electric heating system is used for electrically heating an asphalt tank body and an asphalt mortar discharging port, the asphalt mortar discharging system comprises an air cylinder, a pneumatic valve group and the like to realize accurate metering and discharging of asphalt mortar, and the asphalt smoke discharging device is an environment-friendly discharging system for asphalt smoke and water vapor generated by heating. According to the high-position hot melting RAP fine aggregate asphalt mortar preparing and adding device, asphalt mortar double-layer laminar flow stirring and filtering are designed, effective dissolving and uniform dispersing of asphalt mortar are achieved, through reasonable setting of the working rotating speed and the working rotating direction of the four sets of frequency conversion spiral stirrers, the uniformity, the fluidity and the workability of asphalt mortar are guaranteed, and the high-position hot melting RAP fine aggregate asphalt mortar preparing and adding device is suitable for large-scale production. High-quality, high-efficiency and high-addition application of the RAP fine aggregate is improved, and better and wider application prospects are brought to RAP material application.

Description

Technical Field

[0001] This invention relates to the field of road construction technology, and in particular to a device for preparing and adding high-grade hot-melt RAP fine aggregate asphalt slurry. Background Technology

[0002] Asphalt concrete pavement accounts for 80% of the road surface structure in my country. Currently, 5 million kilometers of roads require maintenance, representing 98% of the total road mileage. my country is poised to become the world's largest market for recycled asphalt pavement materials. According to incomplete statistics, the annual removal of waste asphalt mixtures from major and medium-scale asphalt pavement repairs nationwide reaches tens of millions of tons, currently exceeding 200 million tons. Large quantities of waste asphalt mixtures are generated annually during old road maintenance projects. Direct disposal not only requires the extraction of vast amounts of soil and rock resources but also easily pollutes the environment. As various grades of asphalt pavements in my country enter their maintenance phase, and with the peak of old road reconstruction and maintenance, how to effectively utilize waste asphalt mixtures has become a crucial issue urgently needing to be addressed. To reduce project costs, realize the concept of green development, build a resource-saving society, and further enhance public environmental awareness, guided by the scientific development concept of sustainable development, the plan clearly requires that the utilization rate of recycled asphalt materials reach over 90%, making the in-depth development of recycled asphalt pavement an inevitable trend. As direct participants in my country's highway construction, road and bridge engineers need to conduct in-depth research in this field and improve the utilization efficiency of asphalt pavement recycled materials through various forms and approaches. This is not only necessary for the development of enterprises, but also for the development of the country's transportation industry.

[0003] Among the large quantities of milled asphalt mixtures, the most valuable is the RAP fine aggregate with a high asphalt content. A high-level hot-melt RAP fine aggregate asphalt slurry preparation and addition device is a RAP fine aggregate recycling process. This research focuses on the application of the 0-5 fine aggregate, which has the highest asphalt content and utilization value in RAP. It involves drying and dehydrating the RAP fine aggregate through a heating system, then mixing it evenly with hot asphalt to produce asphalt slurry. This slurry is then used as an auxiliary material in asphalt mixture production at a certain proportion, significantly reducing the asphalt-aggregate ratio and production costs, effectively ensuring the high-quality and efficient application of RAP. Therefore, this high-level hot-melt RAP fine aggregate asphalt slurry preparation and addition device can ensure continuous production at asphalt mixing plants and stabilize the quality of asphalt mixtures. This research result has significant potential market demand, enabling the large-scale, efficient, and rational application of RAP in the market, and effectively supplementing efforts to improve RAP utilization and achieve the target utilization rate of recycled materials. Summary of the Invention

[0004] The main objective of this invention is to provide a device for preparing and adding high-grade hot-melt RAP fine aggregate asphalt slurry, which can effectively solve the problems in the background art.

[0005] To achieve the above objectives, the technical solution adopted by the present invention is as follows: A high-level hot-melt RAP fine aggregate asphalt slurry preparation and addition device includes an asphalt storage tank. The storage tank contains an asphalt mixing system, an asphalt electric heating system, a large particle aggregate filtration device, an asphalt unloading pneumatic valve, and an asphalt fume emission device. The asphalt mixing system includes two sets of symmetrical four-group variable frequency spiral mixers. The asphalt electric heating system is for electric heating of the asphalt tank body and the asphalt unloading port. The large particle aggregate filtration device is composed of a detachable and washable filter plate installed on the upper part of the asphalt tank. The asphalt unloading system is an asphalt slurry unloading opening and closing port. The asphalt fume emission port is an environmentally friendly emission port for asphalt fumes and water vapor generated by heating.

[0006] The electric heating system includes a heating cavity heat dissipation pipe and heat dissipation fins, and the electric heating component includes an electric heating rod, an intelligent heating controller, and related wiring.

[0007] The large particle aggregate filtration device includes a mounting bracket and a hanger, and the bracket is used to install porous filter plates in sections.

[0008] The asphalt unloading valve has a protective sleeve for the valve stem inside the tank; the valve stem is connected to the valve cover for pushing; the electric heating wire of the valve cover is powered by a cable installed inside the valve stem; an electric heating device is installed at the asphalt unloading port; the valve cover and the asphalt unloading port are designed with corresponding bevels to facilitate flushing of adhering material; the valve cover and the asphalt unloading port have built-in temperature sensors to achieve temperature control and monitoring.

[0009] Preferably, the asphalt mixing system is driven by a variable frequency motor and a gearbox assembly to rotate the spiral mixer, and the four sets of spiral mixers are individually frequency-adjustable.

[0010] Preferably, the large particle aggregate filtration device is installed horizontally, the porous filter plate is placed on a bracket, and the bracket is fixedly connected to the top of the asphalt tank by a hanger. To facilitate disassembly and cleaning, the porous filter plate is installed in sections and segments and secured with easy-release key pins.

[0011] Preferably, the asphalt unloading valve is located on the lower left side of the asphalt tank. The asphalt unloading valve relies on a power cylinder to pull the valve rod and drive the valve cover to realize the function of storing or releasing asphalt slurry.

[0012] Preferably, the valve cover is electrically heated by a cable built into the sleeve, which powers an electric heating wire inside the valve cover. The asphalt discharge port is equipped with an electric heating wire powered by an external cable connected to the asphalt tank. Temperature sensors built into both the valve cover and the asphalt discharge port enable temperature control and monitoring.

[0013] Preferably, the valve cover and the asphalt discharge port are made of special materials that are corrosion-resistant, friction-resistant, high-temperature resistant, and impact-resistant, and are sealed with a corresponding bevel. This facilitates the flushing of asphalt slurry fluid when the valve cover is opened and closed, reducing material adhesion.

[0014] This invention provides an improved device for preparing and adding high-grade hot-melt RAP fine aggregate asphalt mortar, which has the following significant improvements and advantages compared with the prior art: (1) Four sets of variable frequency spiral agitators are designed. The speed and direction of the four sets of spiral agitators can be effectively controlled by frequency conversion, so as to achieve controllable flow and mixing of asphalt slurry in the asphalt tank. When the two sets of spiral agitators on the lower side of the asphalt tank are turned on for convection, the speed of the asphalt slurry can be adjusted to achieve strong or weak mixing. When all four sets are turned on at the same time, the mixing and filtering functions of the asphalt slurry can be achieved by adjusting the direction of rotation.

[0015] (2) A large particle aggregate filtration device is designed to effectively clean large particles larger than the mesh size, ensuring that the particle size of the asphalt mortar aggregate is controllable. The disassembly design enables safe, efficient and convenient cleaning.

[0016] (3) Design an intelligent heating controller to control the electric heating system, including the heating cavity heat dissipation pipe and heat dissipation fins, to increase the heating area, improve the heat conduction rate, improve the heating efficiency and achieve intelligent temperature control.

[0017] (4) The design incorporates electric heating for the asphalt slurry discharge port and electric heating for the valve cover, with built-in temperature sensors to achieve temperature control and monitoring. This effectively ensures that the valve cover and valve port are in a controllable high-temperature state during production, preventing material from sticking to the valve port and valve cover, and ensuring good opening and closing sealing of the valve body.

[0018] (5) The valve cover and the asphalt discharge port are made of special materials that are corrosion-resistant, friction-resistant, high temperature-resistant and impact-resistant, and have a corresponding bevel seal. This is beneficial for the asphalt slurry fluid to be flushed when the valve cover is opened and closed, reducing material adhesion and ensuring effective valve body sealing. Attached Figure Description

[0019] Figure 1 This is a schematic diagram of the overall structure of a high-level hot-melt RAP fine aggregate asphalt slurry preparation and addition device according to the present invention; Figure 2 This is a schematic diagram of the laminar flow small circulation stirring state of the high-level hot-melt RAP fine aggregate asphalt slurry preparation and addition device of the present invention; Figure 3 This is a schematic diagram of the large-circulation stirring and filtration state of a high-level hot-melt RAP fine aggregate asphalt slurry preparation and addition device according to the present invention; Figure 4 This is a view of the mixing system of a high-position hot-melt RAP fine aggregate asphalt slurry preparation and addition device according to the present invention; Figure 5 This is a detailed structural diagram of a high-level hot-melt RAP fine aggregate asphalt slurry preparation and addition device and a large particle aggregate filtration device according to the present invention. Figure 6This is a detailed structural diagram of the asphalt unloading pneumatic valve and power cylinder of the high-position hot-melt RAP fine aggregate asphalt slurry preparation and addition device of the present invention.

[0020] Figure 7 This is a structural diagram of the electric heating system of a high-level hot-melt RAP fine aggregate asphalt slurry preparation and addition device according to the present invention.

[0021] In the diagram: 1. Asphalt tank; 2. RAP fine aggregate inlet; 3. Hot asphalt inlet; 4. Asphalt fume emission device; 5. Spiral agitator; 6. Variable frequency motor and gearbox assembly; 7. Spiral agitator; 8. Electric heating system; 9. Electric heating mounting cavity; 10. Electric heating assembly; 11. Large particle aggregate filter; 12. Asphalt slurry discharge valve; 13. Discharge port; 14. Valve cover; 15. Cylinder; 16. Heat sink and fins; 17. Electric heating rod; 18. Intelligent heating... 19. Heat controller; 20. Bracket; 21. Hanger; 22. Porous filter plate; 23. Valve stem protective sleeve; 24. Valve stem; 25. Cable; 26. Asphalt slurry discharge port; 27. Electric heating device; 28. Valve cover electric heating wire; 29. ​​Temperature sensor; 30. Sleeve fixing bolt; 31. Tie rod fixing bolt; 32. Sleeve adjusting flexible connection; 33. Cylinder support; 34. Cylinder piston; 35. Cylinder fixing screw; 36. Filter screen positioning pin; 37. Filter screen disassembly and assembly tools. Detailed Implementation

[0022] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0023] like Figure 1-6 As shown, a high-level hot-melt RAP fine aggregate asphalt slurry preparation and addition device includes an asphalt tank 1 with a RAP fine aggregate inlet 2 on the top left, a hot asphalt inlet 3 on the right, and an asphalt fume emission device 4. Four sets of spiral agitators 5 are fixedly installed inside the asphalt tank 1. The spiral agitator 5 includes a variable frequency motor and a gearbox assembly 6 and a spiral agitator 7. An electric heating system 8 is fixedly installed inside the asphalt tank 1. The electric heating system 8 includes an electric heating installation cavity 9 and an electric heating assembly 10. A large particle aggregate filter 11 is installed in the upper part of the asphalt tank 1. The large particle aggregate filter 11 is set as a segmented, easily removable perforated plate. An asphalt slurry discharge valve 12 is provided in the lower part of the asphalt tank 1. The discharge port 13 and valve cover 14 of the asphalt slurry discharge valve 12 are equipped with an electric heating anti-caking design. The pull rod of the asphalt slurry discharge valve 12 passes through the asphalt tank 1 and a power cylinder 15 is installed at the top of the asphalt tank. The electric heating cavity 9 includes a heat dissipation pipe and a heat dissipation fin 16, and the electric heating assembly 10 includes an electric heating rod 17, an intelligent heating controller 18, and related wiring. The large particle aggregate filtration device 11 includes a mounting bracket 19 and a hanger 20. The bracket 19 is used to install porous filter plates 21 in sections. The valve stem 23 inside the tank of the asphalt unloading valve 12 is equipped with a valve stem protective sleeve 22; the valve stem 23 inside the valve cover 14 is connected to the push; the valve cover electric heating wire 27 is powered by a cable 24 installed inside the valve stem 23; the asphalt slurry unloading port 25 is equipped with an electric heating device 26; the valve cover 14 and the asphalt unloading port 25 are designed with corresponding oblique openings to facilitate flushing of adhering material; the valve cover 14 and the asphalt unloading port 25 have built-in temperature sensors 28.

[0024] All electrical equipment involved in this device is controlled by a unified circuit and frequency converter controller. The control principle is simple and is existing technology.

[0025] It should be noted that this invention is a high-level hot-melt RAP fine aggregate asphalt slurry preparation and addition device. To facilitate the entry of the asphalt slurry into the asphalt slurry scale and mixing tank, this device should be installed at the top of the asphalt mixing plant. In use, hot asphalt is first added through inlet 3, and the electric heating system 8 is started. Then, the heated and dried RAP fine aggregate is added through inlet 2 in a certain proportion of the hot asphalt, and mixed in the asphalt tank 1. After heating to a certain temperature, the two sets of spiral agitators 5 below the asphalt tank are started for convection mixing. After observing that the asphalt slurry is evenly mixed, the two sets of spiral agitators above the asphalt tank are started. At this time, all four sets of spiral agitators work simultaneously in the flow direction, entering the mixing process. In the filtration state, after the set time, the large aggregate filter device 11 is cleaned to remove large aggregates or impurities. Samples are taken from different locations in the laboratory to check the mixing of asphalt mortar. After the test is qualified, the addition amount is calculated according to the asphalt and fine particle content in the asphalt mortar, and the addition ratio is set according to the asphalt and fine aggregate addition ratio in the design gradation. It participates in the synchronous metering and addition of asphalt mixture production. During metering, the asphalt mortar unloading valve 12 is opened to feed into the weighing. After the design weight is reached, the valve is closed to stop metering. The asphalt mortar and hot asphalt are simultaneously unloaded into the mixing tank of the asphalt mixing plant to produce asphalt mixture. During the production process, the fumes generated by heating are introduced into the fumes treatment system through the asphalt fumes emission device 4.

[0026] It should be noted that, in this document, relational terms such as "first" and "second" are used only to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such process, method, article, or apparatus.

[0027] Although embodiments of the invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A device for preparing and adding high-grade hot-melt RAP fine aggregate asphalt mortar, comprising an asphalt tank (1), characterized in that: The asphalt tank (1) has a RAP fine aggregate inlet (2) on the top left and a hot asphalt inlet (3) and an asphalt fume emission device (4) on the right. An asphalt mixing system is fixedly installed inside the asphalt tank (1). The asphalt mixing system includes a variable frequency motor (5), a gearbox assembly (6), and a spiral mixer (7). An electric heating system (8) is fixedly installed inside the asphalt tank (1). The electric heating system (8) includes an electric heating mounting cavity (9) and an electric heating assembly (10). The asphalt... A large particle aggregate filter device (11) is installed in the upper part of the tank body (1). The large particle aggregate filter device (11) is set as a segmented, easily removable perforated plate. An asphalt slurry unloading system is set at the bottom of the asphalt tank (1). The asphalt unloading system includes an asphalt slurry unloading valve (12), an unloading port (13), and a valve cover (14). The unloading port and the valve cover are equipped with an electric heating anti-caking design. The asphalt slurry unloading valve (12) passes through the asphalt tank body (1) through a pull rod (23) and a power cylinder (15) is installed at the top of the asphalt tank to realize the opening and closing action. The electric heating system includes an electric heating cavity heat dissipation pipe (9) and a heat dissipation fin (16), and the electric heating assembly (10) includes an electric heating rod (17) and an intelligent heating controller (18) and related wiring. The large particle aggregate filtration device (11) includes a mounting bracket (19) and a hanger (20), and a porous filter plate (21) is installed in sections on the bracket (19). The asphalt unloading valve (12) has a valve stem (23) with a valve stem protective sleeve (22) inside the tank; the valve stem (23) inside the valve cover (14) is connected to the push; the valve cover electric heating wire (27) is powered by a cable (24) installed inside the valve stem (23) sleeve; the asphalt unloading port (25) is equipped with an electric heating device (26); the valve cover (14) and the asphalt unloading port (25) are designed with corresponding oblique openings to facilitate flushing of sticky material; the valve cover (14) and the asphalt unloading port (25) have built-in temperature sensors (28), intelligent heating controllers (18) and related wiring.

2. The device for preparing and adding high-grade hot-melt RAP fine aggregate asphalt slurry according to claim 1, characterized in that: The asphalt mixing system is driven by a variable frequency motor (5) and a gearbox assembly (6), and its four sets of spiral mixers (7) are frequency-adjustable.

3. The device for preparing and adding high-grade hot-melt RAP fine aggregate asphalt slurry according to claim 1, characterized in that: The large particle aggregate filtration device (11) is installed horizontally, and the porous filter plate (21) is placed on the bracket (19). The bracket (19) is fixedly connected to the top of the asphalt tank (1) by the hanger. Each porous filter plate (21) is fixedly installed by the positioning pin (35) and is disassembled and assembled in sections by special tools (36).

4. The device for preparing and adding high-grade hot-melt RAP fine aggregate asphalt slurry according to claim 1, characterized in that: The asphalt unloading valve (12) is located directly below the left side of the asphalt tank (1). The asphalt unloading valve (12) relies on the power cylinder (15) to pull the valve rod (23) and drive the valve cover (14) to realize the function of storing or releasing asphalt slurry.

5. The device for preparing and adding high-grade hot-melt RAP fine aggregate asphalt slurry according to claim 4, characterized in that: The valve cover (14) is electrically heated by a cable built into the valve stem (23) to an electric heating wire (27) inside the valve cover (14); the valve stem (23) is protected by a sleeve (22), which is fixed to the valve cover by bolts (29) through its own threads; the valve stem (23) is fixed to the valve cover (14) by bolts (30); the asphalt discharge port (25) is equipped with an electric heating wire (26) which is heated by an external cable from the asphalt tank (1); the valve cover (14) and the asphalt discharge port (25) are equipped with built-in temperature sensors (28) to achieve temperature control and monitoring.

6. The device for preparing and adding high-grade hot-melt RAP fine aggregate asphalt slurry according to claim 5, characterized in that: The valve cover (14) is connected to the piston (33) of the power cylinder (15) via the valve stem (23) to realize the opening and closing of the valve; the power cylinder (15) is fixed to the cylinder support (32) via the fixing screw (34), and the relative distance between the protective sleeve (22) and the valve stem (23) is adjusted by the flexible connection (31).

7. The apparatus for preparing and adding high-grade hot-melt RAP fine aggregate asphalt mortar according to claim 5, characterized in that: The valve cover (14) and the asphalt discharge port (25) are made of special materials that are corrosion-resistant, friction-resistant, high-temperature resistant and impact-resistant, and have a corresponding bevel seal, which is beneficial for the asphalt slurry fluid to be flushed when the valve cover (14) is opened and closed, and reduces the sticking of materials.

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