RAP adding steam discharging negative pressure adjusting device

Abstract

The invention discloses an RAP adding steam discharge negative pressure adjusting device, and relates to the technical field of asphalt pavement regeneration, the RAP adding steam discharge negative pressure adjusting device comprises a hot aggregate scale body and a stirring pot body which are in non-rigid connection, and the aggregate scale body is subjected to steam negative pressure treatment; when the fine aggregate enters the scale, the adjusting device stops running immediately, moisture in steam is extracted and condensed and collected in the discharge box, and dry gas is discharged through the exhaust hole; steam treatment at the mixing pot: when the accurately metered RAP and hot aggregate enter the mixing pot at the same time for dry mixing, starting a steam discharge negative pressure adjusting device through an intelligent control system, immediately stopping running the adjusting device when mineral powder enters the mixing pot, pumping out steam, primarily filtering the steam through a filter screen, pumping out water in the steam, condensing and collecting the water in a discharge box, and discharging the water in the discharge box; and the dry gas is exhausted through the exhaust hole. The two systems can quickly reduce the pressure in the box body, protect the sealing structure of the equipment, ensure the quality of the mixture and improve the production efficiency.

Description

Technical Field

[0001] This invention relates to the field of asphalt pavement recycling technology, specifically to a RAP (Rapid Acid Additive) steam emission negative pressure regulating device. Background Technology

[0002] The annual production of RAP material for roads at all levels is approximately 150 to 200 million tons. Due to the inability to apply RAP material to a high-quality environment, a large amount of RAP material is disposed of as solid waste. This invention addresses this issue by premixing RAP material with new hot aggregates to produce asphalt mixtures, thereby enabling resource reuse, reducing the demand for asphalt and raw materials, saving costs and reducing environmental pollution. The addition of RAP can improve the performance of asphalt mixtures, such as enhancing their rutting resistance and high-temperature resistance. By recycling and reusing RAP, the stock of solid waste can be effectively consumed, contributing to environmental protection and sustainable development.

[0003] The main methods for recycling RAP (Rich Aggregate Additive) materials to produce asphalt mixtures are hot recycling and cold addition. Hot recycling requires an expensive hot recycling system, which is complex and occupies a large area, and is typically used in long-term, fixed-site applications. Cold addition involves simpler, less expensive equipment and is flexible and convenient for use with asphalt engineering plants. However, its promotion and application have stagnated because the two key issues affecting the quality of asphalt mixtures—raising the temperature of the RAP material and removing moisture—have not been effectively resolved. The cold addition and layering solution effectively solves the problems of raising the temperature and removing moisture. Cold addition and layering mainly involves two heating processes in the aggregate weigher and mixing pot, with two separate moisture evaporation processes. These breakthroughs in overcoming these two key issues provide the optimal approach for the comprehensive promotion and high-quality application of RAP materials.

[0004] As a beneficial supplement to the cold-feeding and stacking scheme, the present invention mainly addresses the issues of moisture removal and high instantaneous steam pressure in RAP. When RAP material enters the aggregate weigher to mix with hot aggregate, and when it enters the mixing pot to further exchange heat with hot aggregate and asphalt, a certain amount of water vapor and the pressure brought by the water vapor are generated instantaneously. If this moisture is not effectively treated, it will affect the quality of the asphalt mixture. At the same time, the instantaneous pressure will have an adverse effect on the equipment structure and the metering of the aggregate weigher. Therefore, it is necessary to add steam emission negative pressure regulation measures to ensure the stability and sustainability of asphalt mixture production. Summary of the Invention

[0005] The purpose of this invention is to provide a negative pressure regulating device for RAP addition steam discharge, in order to solve the technical problem that when RAP material is cold-added and stacked into the aggregate weigher body to mix with hot aggregate, and when it enters the mixing pot to further exchange heat with hot aggregate and asphalt, a certain amount of water vapor and the pressure brought by the water vapor will be generated instantaneously. If the water vapor is not treated, it will affect the quality of the asphalt mixture, and at the same time, the instantaneous pressure will have an adverse effect on the equipment structure and the metering of the aggregate weigher body.

[0006] The technical problem to be solved by this invention can be achieved through the following technical solution: A RAP (Rapid Air Purification) steam discharge negative pressure regulating device includes a base plate; The mixing pot body is fixedly connected to the bottom plate, and the top of the mixing pot body is connected to the top cover. A powder feeding mechanism and an aggregate feeding mechanism are provided between the mixing pot body and the bottom plate. The aggregate feeding mechanism is connected to a steam discharge negative pressure regulating device on its side. The steam discharge negative pressure regulating device includes a channel one and an electric valve two. The aggregate feeding mechanism is provided with a dust collection point on the aggregate scale body. The channel one is connected to the dust collection point on the aggregate scale body, and the electric valve two is connected to the channel one. The mixing pot body is equipped with a steam discharge negative pressure regulating device on its side. The pressure discharge mechanism includes an exhaust pipe and an electric valve. The electric valve is a dust suction valve. The mixing pot body has a dust suction plate on its side wall. The exhaust pipe is connected to the dust suction plate on the mixing pot body. A mounting bracket is fixedly connected to the mixing pot body. The exhaust pipe is connected to the mounting bracket. The electric valve is connected to the exhaust pipe. A filter screen is connected to the dust suction plate.

[0007] As a further embodiment of the present invention: the powder feeding mechanism includes a powder scale, a frame is fixedly connected to the base plate, a conveyor belt is connected to the frame, a plurality of feeding hoppers are connected to the conveyor belt, the powder scale is fixedly connected to the top cover, the feeding hoppers are configured to cooperate with the powder scale, a powder inlet valve is fixedly connected between the bottom of the powder scale and the mixing pot body, and a feeding hole is provided on the top cover to cooperate with the discharge pipe.

[0008] As a further aspect of the present invention, a guide plate is fixedly connected to the powder scale.

[0009] As a further embodiment of the present invention: the aggregate feeding mechanism includes an aggregate scale body, the aggregate scale body is disposed above the top cover, a discharge gate is connected between the aggregate scale body and the top cover, a hot aggregate bin is disposed above the aggregate scale body, a vibrating screen is disposed above the hot aggregate bin, an aggregate inlet channel is disposed below the RAP scale, an RAP material lifting and weighing device is disposed above the RAP scale, and an inlet channel and a sealing structure are provided on the top cover in conjunction with the discharge gate.

[0010] As a further aspect of the present invention: the aggregate scale body is provided with an annular porous suction hood at the dust collection point of the aggregate scale body.

[0011] As a further aspect of the present invention: the first electric valve and the second electric valve are pneumatic butterfly valves, and their opening and closing action time is controlled by an intelligent control unit.

[0012] As a further embodiment of the present invention: the end of the channel one away from the aggregate scale body is connected to the discharge box two, the discharge box two is provided with an exhaust hole, the end of the exhaust pipe one away from the mixing pot body is connected to the discharge box one, and both the discharge box one and the discharge box two are provided with condensate collection tanks, and the bottom of the collection tanks is connected to an automatic drain valve.

[0013] As a further aspect of the present invention: a blower pipe is connected to the side of the dust collection plate of the mixing pot, a connecting pipe three is connected to the end of the blower pipe away from the dust collection plate of the mixing pot, an air inlet pipe is connected to the end of the connecting pipe three away from the blower pipe, a fan is connected to the end of the air inlet pipe away from the connecting pipe three, a bracket is fixedly connected to the mixing pot body, and the fan is fixedly connected to the bracket.

[0014] As a further aspect of the present invention: a pulse solenoid valve is provided between the connecting pipe three and the air inlet pipe, and the pulse solenoid valve is electrically connected to the control system of the mixing pot body, and the blowing frequency is adjustable.

[0015] As a further aspect of the present invention: the filter screen of the dust collection plate of the mixing pot is a stainless steel rotating filter screen, and its axis forms an acute angle with the spray direction of the blow pipe.

[0016] The beneficial effects of this invention are: 1. The key to this invention is the automatic stacking and coating of hot aggregates after vibrating and screening, as well as RAP material that is fed in stages through an intelligent program, in a hot aggregate weigher. Through intelligent control, the hot aggregates are fed in stages and at different times according to the actual grade, and the RAP material is fed in stages and at different times. This setting ensures that the RAP is completely coated in the hot aggregates, realizing the premixing and preheating of the RAP material. This ensures that the asphalt mixture gradation and temperature are qualified after adding RAP material, realizing the hot recycling function of the low-cost cold addition device, realizing the high-quality addition of RAP material in asphalt engineering stations, and thus providing reliable technical support for the comprehensive promotion and application of cold addition of RAP material.

[0017] 2. Steam and pressure treatment for cold-feeding aggregate weighing in this invention: A ring-shaped porous suction hood ensures efficient steam collection. Channel one uses a high-temperature resistant stainless steel pipe, and electric valve two is a high-temperature resistant pneumatic butterfly valve. Its opening and closing time is controlled by an intelligent control unit. The RAP feed signal triggers the control program, and electric valve two immediately opens. Steam enters discharge box two through channel one. Moisture in the steam is condensed and collected in the discharge box, and dry gas is discharged through the exhaust port. To prevent fine particles from being drawn away from the manufactured sand or stone chips, the intelligent control unit automatically stops the regulating device when fine aggregate enters the weighing unit. Steam treatment in the mixing pot: The RAP inlet signal triggers the intelligent control unit, and electric valve one opens. Steam is initially filtered through a filter screen. The oil-gas mixture enters discharge box one through exhaust pipe one. Condensed asphalt droplets are separated and collected. The dual-stage steam treatment system can control the residual moisture in the RAP material, preventing moisture from affecting the asphalt coating. To prevent mineral powder from being drawn away, the regulating device immediately stops operating when mineral powder enters the mixing pot.

[0018] 3. When the filter screen of this invention is self-cleaning, the pulse solenoid valve receives the command of the intelligent control unit, compressed air is delivered through the air inlet pipe, and high-pressure airflow passes through the connecting pipe to the blow pipe, and the nozzle sprays onto the filter screen; through the coordinated work of multiple systems, precise control of steam emission during RAP treatment is achieved, the steam removal rate is high, and effective dust removal can reduce filter screen wear, extend the service life of the filter screen, and the dust-cleaned filter screen can filter gas more effectively, improving the overall filtration effect. Attached Figure Description

[0019] The invention will now be further described with reference to the accompanying drawings.

[0020] Figure 1 This is a schematic diagram of the overall structure of the present invention; Figure 2 This is a schematic diagram of the main structure of the present invention; Figure 3 This is a schematic diagram of the filter structure of the present invention.

[0021] In the diagram: 1. Base plate; 2. Mixing pot body; 3. Top cover; 4. Mounting frame; 5. Exhaust pipe 1; 6. Electric valve 1; 7. Discharge box 1; 8. RAP material scale; 9. Aggregate scale body; 10. Powder scale; 11. Frame; 12. Dust collection point of aggregate scale body; 13. Channel 1; 14. Feeding hopper; 15. Conveyor belt; 16. Inlet valve; 17. Discharge gate; 18. Guide plate; 19. Aggregate hot material bin; 20. Mixing pot dust collection plate; 21. Filter screen; 22. Blower pipe; 23. Connecting pipe 3; 26. Electric valve 2; 27. Discharge box 2; 28. Exhaust port; 29. ​​Air inlet pipe; 30. Fan; 31. Support frame; 32. Aggregate scale inlet channel; 33. RAP material lifting and feeding device. 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 Figures 1-3 As shown, a RAP (Rapid Additive Producer) steam discharge negative pressure regulating device includes a base plate 1, a mixing pot body 2 fixedly connected to the base plate 1, a top cover 3 connected to the top of the mixing pot body 2, a powder feeding mechanism and an aggregate feeding mechanism provided between the mixing pot body 2 and the base plate 1, the powder feeding mechanism including a powder scale 10, a frame 11 fixedly connected to the base plate 1, a conveyor belt 15 connected to the frame 11, a plurality of feeding hoppers 14 connected to the conveyor belt 15, the powder scale 10 fixedly connected to the top cover 3, the feeding hoppers 14 and the powder scale 10 being configured to cooperate with each other, a guide plate 18 fixedly connected to the powder scale 10, a powder inlet valve 16 fixedly connected between the bottom of the powder scale 10 and the mixing pot body 2, and a feeding hole that cooperates with the discharge pipe on the top cover 3; The aggregate feeding mechanism includes an aggregate scale body 9, which is located above the top cover 3. A discharge gate 17 is provided between the aggregate scale body 9 and the top cover 3. An aggregate hot silo 19 is provided above the aggregate scale body 9. A vibrating screen is provided above the aggregate hot silo 19. An aggregate inlet channel 32 is provided below the RAP scale 8. An RAP material lifting and feeding device 33 is provided above the RAP scale 8. An inlet hole that cooperates with the discharge pipe is provided on the top cover 3. The aggregate hot material bin 19 is connected to a steam discharge negative pressure regulating device on its side. The steam discharge negative pressure regulating device includes a channel 13 and an electric valve 26. The aggregate scale body 9 is provided with an aggregate scale body dust collection point 12 on its side. The channel 13 is connected to the aggregate scale body dust collection point 12, and the electric valve 26 is connected to the channel 13. The end of the channel 13 away from the aggregate scale body 9 is connected to a discharge box 27, and the discharge box 27 is provided with an exhaust port 28. The aggregate scale body 9 is provided with an annular porous suction hood at the aggregate scale body dust collection point 12. The design of the annular porous suction hood and the high-temperature resistant pipe ensures effective steam collection and reduces steam escape.

[0024] A pressure discharge mechanism is provided on the side of the mixing pot body 2. The pressure discharge mechanism includes an exhaust pipe 5 and an electric valve 6. The electric valve 6 is a dust suction valve. A dust suction plate 20 is provided on the side wall of the mixing pot body 2. The exhaust pipe 5 is connected to the dust suction plate 20 on the mixing pot body 2. A mounting bracket 4 is fixedly connected to the mixing pot body 2. The exhaust pipe 5 is connected to the mounting bracket 4. The electric valve 6 is connected to the exhaust pipe 5. The end of the exhaust pipe 5 away from the mixing pot body 2 is connected to a discharge box 7. The electric valves 6 and 26 are pneumatic butterfly valves. Their opening and closing times are controlled by an intelligent control unit. The integrated and automated control by the intelligent control unit improves the automation and intelligence of the entire production process and reduces manual intervention. Both the discharge box 7 and the discharge box 27 are equipped with condensate collection tanks. An automatic drain valve is connected to the bottom of the collection tank. A filter screen 21 is connected to the dust collection plate 20 of the mixing pot. A blow pipe 22 is connected to the side of the dust collection plate 20. A connecting pipe 23 is connected to the end of the blow pipe 22 away from the dust collection plate 20. An air inlet pipe 29 is connected to the end of the connecting pipe 23 away from the blow pipe 22. A pulse solenoid valve is provided between the connecting pipe 23 and the air inlet pipe 29. The pulse solenoid valve is electrically connected to the control system of the mixing pot body 2, and the blowing frequency is adjustable. A fan 30 is connected to the end of the air inlet pipe 29 away from the connecting pipe 23. A bracket 31 is fixedly connected to the mixing pot body 2, and the fan 30 is fixedly connected to the bracket 31. The filter screen 21 of the dust collection plate 20 is a stainless steel rotating filter screen, and its axis forms an acute angle with the spray direction of the blow pipe 22.

[0025] The working principle of this invention: This device effectively solves the problem of steam pressure accumulation caused by moisture evaporation in RAP material during asphalt mixture production through an intelligent steam emission and negative pressure regulation system. Aggregates enter the aggregate scale body 9 through the aggregate hot aggregate bin 19 for accurate weighing, and RAP material enters the RAP material scale 8 through the lifting weighing device 33 for accurate weighing. After weighing, it enters the aggregate scale 9 through the aggregate scale inlet channel 32. RAP material and hot aggregate are stacked and metered and coated, and then enter the mixing pot body 2 through the aggregate scale 9 and the discharge gate 17. Powder is transported to the powder scale 10 through the conveyor belt 15 and the feeding hopper 14, and then added to the mixing pot through the inlet valve 16. The first steam source is located on the aggregate weigher body 9. Due to the rapid evaporation of moisture when the RAP material comes into contact with the high-temperature aggregate for the first time, the amount of steam is large but the duration is short. The second steam source is located on the mixing pot body 2. Due to the secondary heating when the RAP material is mixed with asphalt, the large contact area generates a large amount of steam and the duration is long. The steam temperature is high and contains asphalt volatiles. Steam treatment of the aggregate scale body: A ring-shaped porous suction hood ensures efficient steam collection. Channel 13 is made of high-temperature resistant stainless steel pipe, and electric valve 26 is a high-temperature resistant pneumatic butterfly valve. The RAP feed signal triggers the intelligent control unit, and electric valve 26 opens immediately. Steam enters discharge box 27 through channel 13. The moisture in the steam is condensed and collected in the discharge box, and the dry gas is discharged through exhaust port 28. To prevent fine particles in the manufactured sand or stone chips from being drawn away, the intelligent control unit automatically stops the operation of this regulating device when fine aggregates are fed into the scale. Precise control of steam emission helps maintain the optimal state of RAP materials in the asphalt mixture, reduces the degradation of material properties caused by improper steam treatment, and thus improves the quality of the asphalt mixture. Reducing harmful substances in steam emissions, such as asphalt volatiles, helps reduce environmental pollution. Steam treatment in the mixing pot: The RAP inlet signal triggers the intelligent control unit, and the electric valve 6 opens. Steam is initially filtered through the filter screen 21. The oil-gas mixture enters the discharge box 7 through the exhaust pipe 5. The condensed asphalt droplets are separated and collected. To prevent the mineral powder from being drawn away, the intelligent control unit automatically stops the operation of the regulating device when the mineral powder enters the mixing pot.

[0026] When the filter screen 21 is self-cleaning, the pulse solenoid valve receives a command from the PLC, and compressed air is delivered through the air inlet pipe 29. The high-pressure airflow passes through the connecting pipe 23 to the blow pipe 22, and the nozzle sprays onto the filter screen. This device achieves precise control of steam emissions during the RAP treatment process through the coordinated operation of multiple systems. It has a high steam removal rate and significantly improves the production quality of asphalt mixture and the stability of equipment operation.

[0027] The foregoing has provided a detailed description of one embodiment of the present invention, but this description is merely a preferred embodiment and should not be construed as limiting the scope of the invention. All equivalent variations and modifications made within the scope of the claims of this invention should still fall within the patent coverage of this invention.

Claims

1. A RAP (Rapid Air Purification) steam discharge negative pressure regulating device, comprising a base plate (1); characterized in that: The bottom plate (1) is fixedly connected to the mixing pot body (2), the top of the mixing pot body (2) is connected to the top cover (3), and the mixing pot body (2) and the top cover (3) are provided with a powder feeding mechanism and an aggregate feeding mechanism. The aggregate feeding mechanism is connected to a steam discharge negative pressure regulating device on its side. The steam discharge negative pressure regulating device includes a channel one (13) and an electric valve two (26). The aggregate feeding mechanism is provided with a dust suction point (12) on the aggregate scale body. The channel one (13) is connected to the dust suction point (12) on the aggregate scale body, and the electric valve two (26) is connected to the channel one (13). A steam discharge negative pressure regulating device is provided on the side of the mixing pot body (2). The steam discharge negative pressure regulating device includes an exhaust pipe (5) and an electric valve (6). The electric valve (6) is a dust suction valve. A mixing pot dust suction plate (20) is on the side wall of the mixing pot body (2). The exhaust pipe (5) is connected to the mixing pot dust suction plate (20) on the mixing pot body (2). A mounting bracket (4) is fixedly connected to the mixing pot body (2). The exhaust pipe (5) is connected inside the mounting bracket (4). The electric valve (6) is connected to the exhaust pipe (5). A filter screen (21) is connected to the mixing pot dust suction plate (20).

2. The RAP steam discharge negative pressure regulating device according to claim 1, characterized in that, The powder feeding mechanism includes a powder scale (10), a frame (11) is fixedly connected to the base plate (1), a conveyor belt (15) is connected to the frame (11), a plurality of feeding hoppers (14) are connected to the conveyor belt (15), the powder scale (10) is fixedly connected to the top cover (3), the feeding hoppers (14) are configured in conjunction with the powder scale (10), a powder inlet valve (16) is fixedly connected between the bottom of the powder scale (10) and the mixing pot body (2), and a feeding channel is provided on the top cover (3) in conjunction with the discharge pipe.

3. The RAP steam discharge negative pressure regulating device according to claim 2, characterized in that, A guide plate (18) is fixedly connected to the powder scale (10).

4. The RAP steam discharge negative pressure regulating device according to claim 2, characterized in that, The aggregate feeding mechanism includes an aggregate scale body (9), which is located above the top cover (3). A discharge gate (17) is connected between the aggregate scale body (9) and the top cover (3). An aggregate hot silo (19) and a RAP scale (8) are located above the aggregate scale body (9). A vibrating screen is located above the aggregate hot silo (19). An aggregate feeding channel (32) is located below the RAP scale (8). An RAP material lifting and feeding device (33) is located above the RAP scale (8). A feeding channel and a sealing structure that cooperate with the discharge gate (17) are provided on the top cover (3).

5. The RAP steam discharge negative pressure regulating device according to claim 4, characterized in that, The aggregate scale body (9) is provided with an annular porous suction hood at the dust collection point (12).

6. A RAP steam discharge negative pressure regulating device according to claim 5, characterized in that, The electric valve one (6) and electric valve two (26) are pneumatic butterfly valves, and their opening and closing action time is controlled by an intelligent control unit.

7. The RAP steam discharge negative pressure regulating device according to claim 1, characterized in that, The end of the channel one (13) away from the aggregate scale body (9) is connected to the discharge box two (27). The discharge box two (27) is provided with an exhaust hole (28). The end of the exhaust pipe one (5) away from the mixing pot body (2) is connected to the discharge box one (7). Both the discharge box one (7) and the discharge box two (27) are provided with condensate collection tanks, and the bottom of the collection tank is connected to an automatic drain valve.

8. A RAP steam discharge negative pressure regulating device according to claim 7, characterized in that, The dust collection plate (20) of the mixing pot is connected to a blower pipe (22) on its side. The end of the blower pipe (22) away from the dust collection plate (20) of the mixing pot is connected to a connecting pipe three (23). The end of the connecting pipe three (23) away from the blower pipe (22) is connected to an air inlet pipe (29). The end of the air inlet pipe (29) away from the connecting pipe three (23) is connected to a fan (30). A bracket (31) is fixedly connected to the mixing pot body (2). The fan (30) is fixedly connected to the bracket (31).

9. A RAP steam discharge negative pressure regulating device according to claim 8, characterized in that, A pulse solenoid valve is provided between the connecting pipe three (23) and the air inlet pipe (29). The pulse solenoid valve is electrically connected to the control system of the mixing pot body (2), and the blowing frequency is adjustable.

10. A RAP (Rapid Air Purification) steam discharge negative pressure regulating device according to claim 1, characterized in that, The filter screen (21) of the dust collection plate (20) of the mixing pot is a stainless steel rotating filter screen, and its axis forms an acute angle with the spray direction of the blow pipe (22).

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