Asphalt mixture production equipment and production method

Abstract

The invention discloses asphalt mixture production equipment and a production method, and belongs to the technical field of asphalt production equipment. The equipment comprises a regeneration drying system, a primary drying system, an asphalt metering and conveying system, a mixture stirring system and the like. The mixture stirring system comprises a stirring cylinder, the stirring cylinder is communicated and connected with a stirring equipment negative pressure pipe, and a pneumatic air door is mounted on the stirring equipment negative pressure pipe; the tail gas outlet end of the regeneration drying system is connected with a regeneration tail gas conveying gas inlet pipe, the regeneration tail gas conveying gas inlet pipe is connected to the stirring cylinder, and a first adjusting air door is arranged on the regeneration tail gas conveying gas inlet pipe. The stirring cylinder is further connected with a regenerated tail gas conveying gas outlet pipe, a second adjusting air door is arranged on the regenerated tail gas conveying gas outlet pipe, and a pressure detection device is further installed on the stirring cylinder. According to the method, in the asphalt feeding and stirring process, the interior of the stirring cylinder is in a positive pressure state and a low-oxygen environment by switching the air doors and adjusting the opening degrees of the first adjusting air door and the second adjusting air door, and volatilization of light components of asphalt is reduced.

Description

Technical Field

[0001] The present invention relates to the technical field of asphalt production equipment, and more specifically to asphalt mixture production equipment and a production method. Background Art

[0002] Asphalt mixture hot mixing technology is to put certain specifications of stone (primary material), mineral powder, asphalt and appropriate proportion of asphalt mixture recycled material (recycled aggregate) into the mixing tank according to the process sequence and mix them. After sufficient mixing, the finished asphalt mixture is formed.

[0003] The quality of finished asphalt mixtures is influenced by many factors. Among them, during the mixing process of high-temperature asphalt with high-temperature aggregate in the mixing tank, thermal oxidation causes aging, hardening and brittleness. Aged asphalt loses its cohesiveness, causing the mixture to loosen and crack. The main reasons for aging during mixing in the mixing tank are as follows: The mixing arm rapidly disperses and coats the surface of the aggregate, while the aggregate tumbles and rotates within the tank. This allows the high-temperature asphalt to fully come into contact with the oxygen within the tank, further accelerating aging and reducing the quality of the finished mixture.

[0004] To solve the above problems, the Chinese utility model patent with authorization announcement number CN 206219946U discloses an asphalt concrete mixing station, which includes a raw material conveying assembly, a metering assembly, a mixing cylinder assembly, a vacuum system and a temperature control system. The raw material conveying assembly is connected to the mixing cylinder assembly through the metering assembly, and the vacuum system is connected to the mixing cylinder assembly. The raw material conveying assembly includes a powder conveying device and a powder screening device, and the powder conveying device is connected to the mixing cylinder assembly through the powder screening device. The setting of the vacuum system can make the mixing equipment of the asphalt concrete mixing station vacuum-treated to prevent oxygen from entering the mixing device and causing aging effects on the asphalt. However, this method of vacuuming the mixing equipment with a vacuum system will cause the light components in the asphalt to volatilize, which can easily lead to hardening of the asphalt. Summary of the Invention

[0005] The present invention provides an asphalt mixture production device and a production method, the main purpose of which is to overcome the shortcomings of existing mixing equipment in which the asphalt is vacuumed during the mixing process, which causes the light components in the asphalt to volatilize and easily leads to the hardening of the asphalt.

[0006] The present invention adopts the following technical solutions: An asphalt mixture production device includes a recycled material metering and conveying system, a recycled drying system, a recycled hot material metering and conveying system, a virgin material metering and conveying system, a virgin drying system, a virgin hot material metering and conveying system, an asphalt metering and conveying system, a powder metering and conveying system, a mixture stirring system, and a tail gas dust removal system; the mixture stirring system includes a stirring cylinder, a discharge door is provided on the stirring cylinder, the recycled hot material metering and conveying system, the virgin hot material metering and conveying system, the asphalt metering and conveying system, and the powder metering and conveying system are respectively connected to the stirring cylinder, the stirring cylinder is connected to a negative pressure pipe of a stirring device, and a pneumatic air door is installed on the negative pressure pipe of the stirring device; the tail gas outlet end of the recycled drying system is connected to a recycled tail gas conveying inlet pipe, the recycled tail gas conveying inlet pipe is connected to the stirring cylinder, and a regulating air door one is provided on the recycled tail gas conveying inlet pipe; a recycled tail gas conveying outlet pipe is also connected to the stirring cylinder, a regulating air door two is provided on the recycled tail gas conveying outlet pipe, and a pressure detection device is also installed on the stirring cylinder.

[0007] In a preferred embodiment, the above-mentioned recycled drying system includes a recycled burner, a recycled combustion chamber, a recycled drying drum, and a recycled waste gas chamber. The recycled burner is installed at one end of the recycled combustion chamber, and the other end is connected to one end of the recycled drying drum. The recycled waste gas chamber is connected to the other end of the recycled drying drum. The exhaust end of the recycled waste gas chamber is connected to a recycled tail gas conveying pipe, and a fan one is installed on the recycled tail gas conveying pipe. The end of the recycled tail gas conveying pipe is connected to the virgin drying system through a recycled secondary combustion flue pipe.

[0008] In a preferred embodiment, the above-mentioned recycled tail gas conveying inlet pipe is connected in parallel with the end of the recycled tail gas conveying pipe, and the end of the recycled tail gas conveying outlet pipe is connected to the recycled combustion chamber through a fan two.

[0009] In a preferred embodiment, the above-mentioned recycled hot material metering and conveying system includes a recycled temporary storage bin, a recycled hot material scale, and a recycled hot material conveying pipe. The recycled temporary storage bin is connected to the bottom of the recycled waste gas chamber. The recycled hot material scale is arranged below the discharge port of the recycled temporary storage bin, and the recycled hot material scale is connected to the stirring cylinder through the recycled hot material conveying pipe.

[0010] In a preferred embodiment, the above-mentioned virgin drying system includes a virgin burner, a virgin drying drum, and a virgin waste gas chamber. The virgin burner is arranged at the inclined lower end of the virgin drying drum. The inclined upper end of the virgin drying drum is connected to the virgin material metering and conveying system, and the virgin waste gas chamber is provided. The exhaust end of the virgin waste gas chamber is connected to the tail gas dust removal system through a virgin main flue pipe.

[0011] In a preferred embodiment, the above-mentioned virgin hot material metering and conveying system includes a virgin hot material elevator, a vibrating screen, a virgin hot material bin, a virgin hot material scale, and a virgin hot material conveying pipe. The vibrating screen is arranged above the virgin hot material bin and is connected to the discharge end of the virgin hot material elevator. The vibrating screen is also connected to a negative pressure pipe of the virgin equipment; the virgin hot material scale is arranged below the discharge end of the virgin hot material bin, and the virgin hot material scale is connected to the mixing cylinder through the virgin hot material conveying pipe.

[0012] In a preferred embodiment, the above-mentioned tail gas dust removal system includes a virgin bag filter and a tail gas exhaust fan connected to the exhaust end of the virgin bag filter. The other end of the negative pressure pipe of the mixing equipment is connected in parallel with the negative pressure pipe of the virgin equipment, and the end of the negative pressure pipe of the virgin equipment is connected to the intake end of the virgin bag filter.

[0013] In a preferred embodiment, the above-mentioned asphalt metering and conveying system includes an asphalt scale, an asphalt conveying pipe, and a butterfly valve. One end of the asphalt conveying pipe is connected to the asphalt scale, and the other end is connected to the mixing cylinder. The butterfly valve is installed on the asphalt conveying pipe.

[0014] The present invention also provides a method for producing asphalt mixture, which uses the above-mentioned asphalt mixture production equipment, and specifically includes the following steps: (1) When feeding materials, adjust damper one and damper two to be closed, and the pneumatic damper to be opened. The negative pressure pipe of the mixing equipment evacuates the inside of the mixing cylinder, so that the inside of the mixing cylinder is in a negative pressure state. The recycled hot material metering and conveying system, the virgin hot material metering and conveying system, and the powder metering and conveying system respectively feed recycled hot material, virgin hot material, and powder into the mixing cylinder; (2) Switch the damper, adjust damper one and damper two to be opened, and the pneumatic damper to be closed. Feed the recycled tail gas into the mixing cylinder, and adjust the opening degrees of damper one and damper two so that the inside of the mixing cylinder is in a positive pressure state. Then, the asphalt metering and conveying system feeds asphalt into the mixing cylinder; (3) Start mixing in the mixing cylinder to mix the asphalt with various aggregates in step (1); (4) When the mixing time ends, switch the damper to make damper one and damper two closed, the pneumatic damper opened, and open the discharge door of the mixing cylinder to discharge the materials. From the above description of the structure of the present invention, compared with the prior art, the present invention has the following advantages: The asphalt mixture production equipment of the present invention is provided with a negative pressure pipe of a mixing equipment communicating with a mixing cylinder, and the negative pressure pipe of the mixing equipment is provided with a pneumatic air door; moreover, the regenerated tail gas conveying inlet pipe at the tail gas outlet end of the regenerative drying system is connected to the mixing cylinder, and at the same time, a regenerated tail gas conveying outlet pipe is also connected to the mixing cylinder. An adjusting air door I and an adjusting air door II are respectively arranged on the regenerated tail gas conveying inlet pipe and the regenerated tail gas conveying outlet pipe. During the process of asphalt feeding and mixing, by switching the air doors and adjusting the opening degrees of the adjusting air door I and the adjusting air door II, the inside of the mixing cylinder is in a positive pressure state and a low-oxygen environment. In the positive pressure state, the volatilization of the light components of the asphalt can be reduced, and the short-term hardening can be delayed; in the low-oxygen environment, the oxidation reaction rate of the asphalt at high temperature is greatly reduced, thereby reducing aging, ensuring the quality of the finished material, and at the same time, the tail gas discharged by the equipment can be fully recycled, reducing the equipment cost. Brief Description of the Drawings

[0016] Figure 1 It is a schematic structural diagram of the present invention.

[0017] Description of the reference numerals: cold material bin 11; regenerative belt scale 12; regenerative aggregate belt 13; regenerative material elevator 14; chute 141; regenerative burner 21; regenerative combustion chamber 22; regenerative drying drum 23; regenerative waste gas chamber 24; regenerative tail gas conveying pipe 25; fan I 26; regenerative secondary combustion smoke pipe 27; regenerative temporary storage bin 31; regenerative hot material scale 32; regenerative hot material conveying pipe 33; virgin material bin 41; virgin belt scale 42; virgin aggregate belt 43; virgin burner 51; virgin drying drum 52; virgin waste gas chamber 53; virgin main smoke pipe 54; virgin hot material elevator 61; vibrating screen 62; virgin hot material bin 63; virgin hot material scale 64; virgin hot material conveying pipe 65; virgin equipment negative pressure pipe 66; asphalt scale 71; asphalt conveying pipe 72; butterfly valve I 73; powder scale 81; powder conveying pipe 82; butterfly valve II 83; mixing cylinder 9; discharge door 91; negative pressure pipe of mixing equipment 92; pneumatic air door 93; regenerated tail gas conveying inlet pipe 94; adjusting air door I 95; regenerated tail gas conveying outlet pipe 96; adjusting air door II 97; fan II 98; pressure detection device 99; virgin bag filter 101; tail gas exhaust fan 102. Detailed Embodiments

[0018] The following refers to the attached Figure 1 to illustrate the detailed embodiments of the present invention. In order to fully understand the present invention, many details are described below, but for those skilled in the art, the present invention can be implemented without these details. For well-known components, methods and processes, no further detailed description will be given below.

[0019] An asphalt mixture production equipment, referring to Figure 1, including a recycled material metering and conveying system, a recycled drying system, a recycled hot material metering and conveying system, a virgin material metering and conveying system, a virgin drying system, a virgin hot material metering and conveying system, an asphalt metering and conveying system, a powder metering and conveying system, a mixture stirring system, and a tail gas dust removal system. Among them: The mixture stirring system includes a stirring cylinder 9, and a discharge door 91 is provided on the stirring cylinder; the recycled hot material metering and conveying system, the virgin hot material metering and conveying system, the asphalt metering and conveying system, and the powder metering and conveying system are respectively connected to the stirring cylinder.

[0020] Refer to Figure 1 , the recycled material metering and conveying system includes a plurality of cold material bins 11, a recycled belt scale 12, a recycled aggregate belt 13, and a recycled material elevator 14. The plurality of cold material bins 11 are arranged at intervals, each cold material bin 11 is filled with recycled coarse aggregate, a recycled belt scale 12 is correspondingly provided below the bottom of each cold material bin 11, the recycled aggregate belt 13 is arranged below each recycled belt scale 12, and the feeding end of the recycled material elevator 14 is butted against the discharging end of the recycled aggregate belt 13.

[0021] Refer to Figure 1 , the above-mentioned recycled drying system includes a recycled burner 21, a recycled combustion chamber 22, a recycled drying drum 23, and a recycled exhaust gas chamber 24. The recycled drying drum 23 is inclined, a recycled burner 21 is installed at one end of the recycled combustion chamber 22, the other end is connected to the higher end of the recycled drying drum 23, and the recycled exhaust gas chamber 24 is connected to the lower end of the recycled drying drum 23. A feeding port is also provided at the higher end of the recycled drying drum 23, and the discharging end of the above-mentioned recycled material elevator 14 is connected to the feeding port through a chute 141.

[0022] Refer to Figure 1 , the exhaust end of the above-mentioned recycled exhaust gas chamber 24 is connected to a recycled tail gas conveying pipe 25, a fan one 26 is installed on the recycled tail gas conveying pipe 25, and the end of the recycled tail gas conveying pipe 25 is connected to the virgin drying system through a recycled secondary combustion flue 27.

[0023] Refer to Figure 1 , the above-mentioned recycled hot material metering and conveying system includes a recycled temporary storage bin 31, a recycled hot material scale 32, and a recycled hot material conveying pipe 33. The recycled temporary storage bin 31 is connected to the bottom of the recycled exhaust gas chamber 24 in communication, the recycled hot material scale 32 is arranged below the discharging port of the recycled temporary storage bin 31, and the recycled hot material scale 32 is connected to the mixture stirring system through the recycled hot material conveying pipe 33.

[0024] Refer to Figure 1, the above-mentioned stirring tank 9 is connected to a negative pressure pipe 92 of a stirring device, and a pneumatic air door 93 is installed on the negative pressure pipe 92 of the stirring device. The above-mentioned regenerated tail gas conveying pipe 25 is connected in parallel to a regenerated tail gas conveying inlet pipe 94, and the regenerated tail gas conveying inlet pipe 94 is connected to the stirring tank 9. A regulating air door 95 is provided on the regenerated tail gas conveying inlet pipe 94. A regenerated tail gas conveying outlet pipe 96 is also connected to the stirring tank 9. A regulating air door 97 is provided on the regenerated tail gas conveying outlet pipe, and the end of the regenerated tail gas conveying outlet pipe 96 is connected to the regenerative combustion chamber 22 through a fan 98. A pressure detection device 99 is also installed on the stirring tank 9 for detecting the internal pressure of the stirring tank 9.

[0025] Refer to Figure 1 , the above-mentioned raw material metering and conveying system includes a plurality of raw material bins 41, a raw belt scale 42 and a raw aggregate belt 43. The plurality of raw material bins 41 are arranged at intervals, each raw material bin 41 contains raw materials, and a raw belt scale 42 is correspondingly provided below the bottom of each raw material bin 41. The raw aggregate belt 43 is arranged below each raw belt scale 42.

[0026] Refer to Figure 1 , the above-mentioned raw material drying system includes a raw burner 51, a raw drying drum 52 and a raw waste gas chamber 53. The raw burner 51 is arranged at the inclined lower end of the raw drying drum 52, and the inclined upper end of the raw drying drum 52 is connected to the discharge end of the raw aggregate belt 43. The inclined upper end of the raw drying drum 52 is also connected to a raw waste gas chamber 53, and the exhaust end of the raw waste gas chamber 53 is connected to the tail gas dust removal system through a main raw smoke pipe 54.

[0027] Refer to Figure 1 , the above-mentioned raw hot material metering and conveying system includes a raw hot material elevator 61, a vibrating screen 62, a raw hot material bin 63, a raw hot material scale 64 and a raw hot material conveying pipe 65. The feeding end of the raw hot material elevator 61 is butted with the inclined lower end (discharge end) of the raw drying drum 52. The vibrating screen 62 is arranged above the raw hot material bin 63 and is butted with the discharge end of the raw hot material elevator 61. The vibrating screen 62 is also connected to a negative pressure pipe 66 of the raw equipment; the raw hot material scale 64 is arranged below the discharge end of the raw hot material bin 63, and the raw hot material scale 64 is connected to the stirring tank 9 through the raw hot material conveying pipe 65.

[0028] Refer to Figure 1 , the above-mentioned tail gas dust removal system includes a raw bag filter 101 and a tail gas exhaust fan 102 connected to the exhaust end of the raw bag filter. The other end of the negative pressure pipe 92 of the stirring device is connected in parallel with the negative pressure pipe 66 of the raw equipment, and the end of the negative pressure pipe 66 of the raw equipment is connected to the intake end of the raw bag filter 101.

[0029] Refer to Figure 1, the above asphalt metering and conveying system includes an asphalt scale 71, an asphalt conveying pipe 72, and a first butterfly valve 73. One end of the asphalt conveying pipe 72 is connected to the asphalt scale 71, and the other end is connected to the mixing tank 9. The first butterfly valve 73 is installed on the asphalt conveying pipe.

[0030] Refer to Figure 1 , the powder metering and conveying system includes a powder scale 81, a powder conveying pipe 82, and a second butterfly valve 83. One end of the powder conveying pipe 82 is connected to the powder scale 81, and the other end is connected to the mixing tank 9. The second butterfly valve 83 is installed on the powder conveying pipe 82.

[0031] The above asphalt mixture production equipment, its specific production method includes the following steps: (1) When feeding materials, close the first regulating air door and the second regulating air door, open the pneumatic air door, and the negative pressure pipe of the mixing equipment evacuates the inside of the mixing tank to make the inside of the mixing tank in a negative pressure state. The recycled hot material metering and conveying system, the virgin hot material metering and conveying system, and the powder metering and conveying system respectively feed recycled hot materials, virgin hot materials, and powders into the mixing tank; (2) Switch the air doors, open the first regulating air door and the second regulating air door, close the pneumatic air door, introduce recycled tail gas into the mixing tank, and adjust the opening degrees of the first regulating air door and the second regulating air door to make the inside of the mixing tank in a positive pressure state. Then, the asphalt metering and conveying system feeds asphalt into the mixing tank; (3) Start mixing in the mixing tank to mix the asphalt with various aggregates in step (1); (4) When the mixing time ends, switch the air doors to close the first regulating air door and the second regulating air door, open the pneumatic air door, and open the discharge door of the mixing tank to discharge the materials.

[0032] The above is only the specific implementation manner of the present invention, but the design concept of the present invention is not limited thereto. Any non-substantive modification made to the present invention using this concept shall fall within the scope of infringement of the protection scope of the present invention.

Claims

1. An asphalt mixture production device, comprising a recycled material metering and conveying system, a recycled drying system, a recycled hot material metering and conveying system, a virgin material metering and conveying system, a virgin drying system, a virgin hot material metering and conveying system, an asphalt metering and conveying system, a powder metering and conveying system, a mixture stirring system, and an exhaust gas dust removal system; the mixture stirring system includes a stirring cylinder, a discharge door is provided on the stirring cylinder, the recycled hot material metering and conveying system, the virgin hot material metering and conveying system, the asphalt metering and conveying system, and the powder metering and conveying system are respectively connected to the stirring cylinder, and it is characterized in that: The stirring tank is connected to a negative pressure pipe of a stirring device, and a pneumatic air door is installed on the negative pressure pipe of the stirring device; the tail gas outlet end of the regeneration drying system is connected to a regeneration tail gas conveying inlet pipe, and the regeneration tail gas conveying inlet pipe is connected to the stirring tank, and a regulating air door I is provided on the regeneration tail gas conveying inlet pipe; a regeneration tail gas conveying outlet pipe is further connected to the stirring tank, a regulating air door II is provided on the regeneration tail gas conveying outlet pipe, and a pressure detection device is further installed on the stirring tank.

2. The asphalt mixture production equipment according to claim 1, characterized in that: The regeneration drying system includes a regeneration burner, a regeneration combustion chamber, a regeneration drying drum and a regeneration waste gas chamber. The regeneration burner is installed at one end of the regeneration combustion chamber, and the other end is connected to one end of the regeneration drying drum. The regeneration waste gas chamber is connected to the other end of the regeneration drying drum. The exhaust end of the regeneration waste gas chamber is connected to a regeneration tail gas conveying pipe, and a fan I is installed on the regeneration tail gas conveying pipe. The end of the regeneration tail gas conveying pipe is connected to the primary drying system through a regeneration secondary combustion smoke pipe.

3. A bituminous mixture production device according to claim 2, characterized in that: The regeneration tail gas conveying inlet pipe is connected in parallel with the end of the regeneration tail gas conveying pipe, and the end of the regeneration tail gas conveying outlet pipe is connected to the regeneration combustion chamber through a fan II.

4. A bituminous mixture production device according to claim 2, characterized in that: The regeneration hot material metering and conveying system includes a regeneration temporary storage bin, a regeneration hot material scale and a regeneration hot material conveying pipe. The regeneration temporary storage bin is connected to the bottom of the regeneration waste gas chamber. The regeneration hot material scale is arranged below the discharge port of the regeneration temporary storage bin, and the regeneration hot material scale is connected to the stirring tank through a regeneration hot material conveying pipe.

5. The asphalt mixture production equipment according to claim 1, characterized in that: The primary drying system includes a primary burner, a primary drying drum and a primary waste gas chamber. The primary burner is arranged at the inclined lower end of the primary drying drum. The inclined upper end of the primary drying drum is connected to the primary hot material metering and conveying system, and a primary waste gas chamber is provided. The exhaust end of the primary waste gas chamber is connected to the tail gas dust removal system through a primary main smoke pipe.

6. The asphalt mixture production equipment according to claim 5, characterized in that: The primary hot material metering and conveying system includes a primary hot material elevator, a vibrating screen, a primary hot material bin, a primary hot material scale and a primary hot material conveying pipe. The vibrating screen is arranged above the primary hot material bin and is butted against the discharge end of the primary hot material elevator. The vibrating screen is further connected to a primary equipment negative pressure pipe. The primary hot material scale is arranged below the discharge end of the primary hot material bin, and the primary hot material scale is connected to the stirring tank through a primary hot material conveying pipe.

7. The asphalt mixture production equipment according to claim 6, characterized in that: The tail gas dust removal system includes a primary bag filter and a tail exhaust fan connected to the exhaust end of the primary bag filter. The other end of the negative pressure pipe of the stirring device is connected in parallel with the negative pressure pipe of the primary equipment. The end of the negative pressure pipe of the primary equipment is connected to the intake end of the primary bag filter.

8. An asphalt mixture production device according to claim 1, characterized in that: The asphalt metering and conveying system includes an asphalt scale, an asphalt conveying pipe and a butterfly valve. One end of the asphalt conveying pipe is connected to the asphalt scale, and the other end is connected to the stirring tank. The butterfly valve is installed on the asphalt conveying pipe.

9. A method for producing asphalt mixture, using an asphalt mixture production device as described in claim 1, characterized in that, Specifically, it includes the following steps: (1)When feeding materials, Damper 1 and Damper 2 are closed, and the pneumatic damper is opened. The negative pressure pipe of the mixing equipment evacuates the inside of the mixing cylinder, making the inside of the mixing cylinder in a negative pressure state. The recycled hot material metering and conveying system, the virgin hot material metering and conveying system, and the powder metering and conveying system respectively feed recycled hot material, virgin hot material, and powder into the mixing cylinder. (2)Switch the damper, open Damper 1 and Damper 2, close the pneumatic damper, introduce recycled tail gas into the mixing cylinder, and adjust the opening degrees of Damper 1 and Damper 2 to make the inside of the mixing cylinder in a positive pressure state. Then, the asphalt metering and conveying system feeds asphalt into the mixing cylinder. (3)The mixing cylinder starts mixing to mix the asphalt with various aggregates in step (1). (4)When the mixing time ends, switch the damper to close Damper 1 and Damper 2, open the pneumatic damper, and open the discharging door of the mixing cylinder to discharge the materials.

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