An asphalt mixture production equipment and production method

Abstract

The application discloses an 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 connected with a stirring equipment negative pressure pipe in a communicating mode, a pneumatic air door is arranged on the stirring equipment negative pressure pipe; a regeneration tail gas conveying inlet pipe is connected to the tail gas outlet end of the regeneration drying system, the regeneration tail gas conveying inlet pipe is connected to the stirring cylinder, an adjusting air door one is arranged on the regeneration tail gas conveying inlet pipe; a regeneration tail gas conveying outlet pipe is further connected to the stirring cylinder, an adjusting air door two is arranged on the regeneration tail gas conveying outlet pipe, and a pressure detection device is further arranged on the stirring cylinder. In the asphalt feeding and stirring process, the opening degrees of the adjusting air door one and the adjusting air door two are adjusted and the air door is switched, so that the stirring cylinder is in a positive pressure state and a low-oxygen environment, and the volatilization of light components of asphalt is reduced.

Description

Technical Field

[0001] This invention relates to the field of asphalt production equipment technology, and more specifically to an asphalt mixture production equipment and production method. Background Technology

[0002] Hot mixing technology for asphalt mixtures involves adding aggregates (virgin materials), mineral powder, asphalt, and appropriate proportions of recycled asphalt mixtures (recycled aggregates) to a mixing tank in a specific process sequence and mixing them thoroughly to form the finished asphalt mixture.

[0003] Many factors influence the quality of finished asphalt mixtures. One such factor is the aging process of high-temperature asphalt during mixing with high-temperature aggregates in the mixing drum. This oxidation causes the asphalt to harden and become brittle. Aged asphalt exhibits reduced bonding strength, making the mixture prone to loosening and cracking. The main reasons for this aging of high-temperature asphalt during mixing in the drum are as follows: Under the action of the mixing arms, the asphalt rapidly disperses and coats the surface of the aggregates. As the aggregates continuously tumble and rotate within the drum, the high-temperature asphalt comes into full contact with oxygen, further accelerating the aging process and reducing the quality of the finished product.

[0004] To address the above issues, Chinese utility model patent CN 206219946U discloses an asphalt concrete mixing plant, comprising 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 via the metering assembly, and the vacuum system is also connected to the mixing cylinder assembly. The raw material conveying assembly includes a powder conveying device and a powder screening device, with the powder conveying device connected to the mixing cylinder assembly via the powder screening device. The vacuum system allows for vacuuming of the mixing equipment in the asphalt concrete mixing plant, preventing oxygen from entering the mixing device and causing aging of the asphalt. However, this method of vacuuming the mixing equipment can cause the light components in the asphalt to volatilize, potentially leading to asphalt hardening. Summary of the Invention

[0005] This invention provides an asphalt mixture production equipment and production method. Its main purpose is to overcome the shortcomings of existing mixing equipment, such as the volatilization of light components in asphalt during the asphalt mixing process, which can easily lead to asphalt hardening.

[0006] The present invention adopts the following technical solution:

[0007] An asphalt mixture production equipment 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 mixing system, and a tail gas dust removal system. The mixture mixing system includes a mixing cylinder with a discharge gate. 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 mixing cylinder. The mixing cylinder is connected to a negative pressure pipe for a mixing device, and a pneumatic damper is installed on the negative pressure pipe. The tail gas outlet of the recycled drying system is connected to a recycled tail gas inlet pipe, which is connected to the mixing cylinder. The recycled tail gas inlet pipe is equipped with a regulating damper. The mixing cylinder is also connected to a recycled tail gas outlet pipe, which is equipped with a regulating damper. A pressure detection device is also installed on the mixing cylinder.

[0008] In a preferred embodiment, the above-mentioned regenerative drying system includes a regenerative burner, a regenerative combustion chamber, a regenerative drying drum, and a regenerative exhaust gas chamber. The regenerative burner is installed at one end of the regenerative combustion chamber, and the other end is connected to one end of the regenerative drying drum. The regenerative exhaust gas chamber is connected to the other end of the regenerative drying drum. The exhaust end of the regenerative exhaust gas chamber is connected to a regenerative exhaust gas conveying pipe. A fan is installed on the regenerative exhaust gas conveying pipe, and the end of the regenerative exhaust gas conveying pipe is connected to the primary drying system through a regenerative secondary combustion flue.

[0009] In a preferred embodiment, the above-mentioned regenerated exhaust gas inlet pipe is connected in parallel with the end of the regenerated exhaust gas delivery pipe, and the end of the regenerated exhaust gas outlet pipe is connected to the regenerated combustion chamber through a second fan.

[0010] In a preferred embodiment, the above-mentioned regenerated hot material metering and conveying system includes a regenerated temporary storage bin, a regenerated hot material scale, and a regenerated hot material conveying pipe. The regenerated temporary storage bin is connected to the bottom of the regenerated waste gas chamber. The regenerated hot material scale is located below the discharge port of the regenerated temporary storage bin and is connected to the stirring cylinder through the regenerated hot material conveying pipe.

[0011] In a preferred embodiment, the above-mentioned raw material drying system includes a raw material burner, a raw material drying drum, and a raw material exhaust chamber. The raw material burner is located at the inclined lower end of the raw material drying drum, the inclined upper end of the raw material drying drum is connected to the raw material metering and conveying system, and the raw material exhaust chamber is provided therein. The exhaust end of the raw material exhaust chamber is connected to the exhaust gas dust removal system through the raw material main flue.

[0012] In a preferred embodiment, the above-mentioned raw hot material metering and conveying system includes a raw hot material elevator, a vibrating screen, a raw hot material silo, a raw hot material scale, and a raw hot material conveying pipe. The vibrating screen is located above the raw hot material silo and is connected to the discharge end of the raw hot material elevator. The vibrating screen is also connected to a raw material equipment negative pressure pipe. The raw hot material scale is located below the discharge end of the raw hot material silo and is connected to the mixing cylinder through the raw hot material conveying pipe.

[0013] In a preferred embodiment, the exhaust gas dust removal system includes a primary bag filter and an exhaust fan connected to the exhaust end of the primary bag filter. The other end of the negative pressure pipe of the mixing device is connected in parallel with the negative pressure pipe of the primary device, and the end of the negative pressure pipe of the primary device is connected to the air inlet of the primary bag filter.

[0014] In a preferred embodiment, 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 mixing cylinder. The butterfly valve is installed on the asphalt conveying pipe.

[0015] The present invention also provides a method for producing asphalt mixtures, using the above-mentioned asphalt mixture production equipment, specifically including the following steps:

[0016] (1) When the material is fed, the regulating damper one and regulating damper two are closed and the pneumatic damper is opened. The negative pressure pipe of the mixing equipment draws air into the mixing cylinder, so that the mixing cylinder is in a negative pressure state. The recycled hot material metering and conveying system, the original hot material metering and conveying system and the powder metering and conveying system respectively feed the recycled hot material, the original hot material and the powder into the mixing cylinder.

[0017] (2) Switch the air door, open the air door one and the air door two, close the pneumatic air door, introduce the regenerated exhaust gas into the mixing cylinder, and adjust the opening of the air door one and the air door two to make the mixing cylinder under positive pressure. Then the asphalt metering and conveying system will put the asphalt into the mixing cylinder.

[0018] (3) Start the mixing tank to mix the asphalt with the various aggregates in step (1);

[0019] (4) When the mixing time is over, switch the air damper to close the regulating air damper one and regulating air damper two, open the pneumatic air damper, and open the discharge door of the mixing tank to discharge the material.

[0020] As can be seen from the above description of the structure of the present invention, compared with the prior art, the present invention has the following advantages:

[0021] The asphalt mixture production equipment of this invention includes a negative pressure pipe for the mixing equipment connected to the mixing cylinder, and the negative pressure pipe is equipped with a pneumatic damper. Furthermore, a regenerated exhaust gas inlet pipe from the exhaust gas outlet of the regenerated drying system is connected to the mixing cylinder, and a regenerated exhaust gas outlet pipe is also connected to the mixing cylinder. The regenerated exhaust gas inlet pipe and the regenerated exhaust gas outlet pipe are respectively equipped with regulating damper one and regulating damper two. During the asphalt feeding and mixing process, by switching the dampers and adjusting the opening of regulating damper one and regulating damper two, the mixing cylinder is kept in a positive pressure state and a low-oxygen environment. The positive pressure state reduces the volatilization of the lightweight components of the asphalt, delaying short-term hardening; while the low-oxygen environment significantly reduces the oxidation reaction rate of the asphalt at high temperatures, thereby reducing aging and ensuring the quality of the finished product. Simultaneously, the exhaust gas emitted by the equipment can be fully recycled and reused, reducing equipment costs. Attached Figure Description

[0022] Figure 1 This is a schematic diagram of the structure of the present invention.

[0023] Explanation of reference numerals in the attached drawings: Cold material bin 11; Recycled belt scale 12; Recycled collection belt 13; Recycled material elevator 14; Chute 141; Recycled burner 21; Recycled combustion chamber 22; Recycled drying drum 23; Recycled exhaust gas chamber 24; Recycled tail gas conveying pipe 25; Fan 1 26; Recycled secondary combustion smoke pipe 27; Recycled temporary storage bin 31; Recycled hot material scale 32; Recycled hot material conveying pipe 33; Raw material bin 41; Raw material belt scale 42; Raw material collection belt 43; Raw material burner 51; Raw material drying drum 52; Raw material exhaust gas chamber 53; Raw material main smoke pipe 54; Raw material hot material bin 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 one 73; powder scale 81; powder conveying pipe 82; butterfly valve two 83; mixing cylinder 9; discharge gate 91; mixing equipment negative pressure pipe 92; pneumatic damper 93; regenerated tail gas conveying inlet pipe 94; regulating damper one 95; regenerated tail gas conveying outlet pipe 96; regulating damper two 97; fan two 98; pressure detection device 99; virgin bag dust collector 101; tail exhaust fan 102. Detailed Implementation

[0024] The following is a reference to the appendix. Figure 1 Specific embodiments of the present invention will be described below. Many details are described below to provide a comprehensive understanding of the invention; however, those skilled in the art can implement the invention without these details. Well-known components, methods, and processes will not be described in detail hereafter.

[0025] An asphalt mixture production equipment, referring to Figure 1It 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 mixing system, and a tail gas dust removal system. The mixture mixing system includes a mixing cylinder 9, which is equipped with a discharge gate 91. 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 each connected to the mixing cylinder.

[0026] Reference Figure 1 The recycled material metering and conveying system includes several cold silos 11, recycled belt scales 12, recycled aggregate belts 13, and recycled material elevators 14. The several cold silos 11 are arranged at intervals, and each cold silo 11 is filled with recycled coarse aggregate. A recycled belt scale 12 is located at the bottom of each cold silo 11. The recycled aggregate belts 13 are located below each recycled belt scale 12. The feed end of the recycled material elevator 14 is connected to the discharge end of the recycled aggregate belt 13.

[0027] Reference Figure 1 The aforementioned regeneration drying system includes a regeneration burner 21, a regeneration combustion chamber 22, a regeneration drying drum 23, and a regeneration exhaust gas chamber 24. The regeneration drying drum 23 is inclined. The regeneration burner 21 is installed at one end of the regeneration combustion chamber 22, and the other end is connected to the higher end of the regeneration drying drum 23. The regeneration exhaust gas chamber 24 is connected to the lower end of the regeneration drying drum 23. A feed inlet is also provided at the higher end of the regeneration drying drum 23, and the discharge end of the aforementioned recycled material elevator 14 is connected to the feed inlet via a chute 141.

[0028] Reference Figure 1 The exhaust end of the aforementioned regenerated exhaust gas chamber 24 is connected to a regenerated exhaust gas delivery pipe 25, on which a fan 26 is installed. The end of the regenerated exhaust gas delivery pipe 25 is connected to the primary drying system through a regenerated secondary combustion flue pipe 27.

[0029] Reference Figure 1 The aforementioned regenerated hot material metering and conveying system includes a regenerated temporary storage bin 31, a regenerated hot material scale 32, and a regenerated hot material conveying pipe 33. The regenerated temporary storage bin 31 is connected to the bottom of the regenerated waste gas chamber 24. The regenerated hot material scale 32 is located below the discharge port of the regenerated temporary storage bin 31. The regenerated hot material scale 32 is connected to the mixing system through the regenerated hot material conveying pipe 33.

[0030] Reference Figure 1The aforementioned mixing cylinder 9 is connected to a negative pressure pipe 92 of a mixing device, and a pneumatic damper 93 is installed on the negative pressure pipe 92. The aforementioned regenerated exhaust gas delivery pipe 25 is connected in parallel to a regenerated exhaust gas delivery inlet pipe 94, which is connected to the mixing cylinder 9. The regenerated exhaust gas delivery inlet pipe 94 is equipped with a regulating damper 95. A regenerated exhaust gas delivery outlet pipe 96 is also connected to the mixing cylinder 9. The regenerated exhaust gas delivery outlet pipe is equipped with a regulating damper 97, and the end of the regenerated exhaust gas delivery outlet pipe 96 is connected to the regenerated combustion chamber 22 via a blower 98. A pressure detection device 99 is also installed on the mixing cylinder 9 to detect the internal pressure of the mixing cylinder 9.

[0031] Reference Figure 1 The aforementioned raw material metering and conveying system includes several raw material bins 41, raw material belt scales 42, and raw material collection belts 43. The several raw material bins 41 are arranged at intervals, each raw material bin 41 is filled with raw material, and a raw material belt scale 42 is correspondingly located below the bottom of each raw material bin 41. The raw material collection belts 43 are located below each raw material belt scale 42.

[0032] Reference Figure 1 The aforementioned primary drying system includes a primary burner 51, a primary drying drum 52, and a primary exhaust chamber 53. The primary burner 51 is located at the inclined lower end of the primary drying drum 52, and the inclined upper end of the primary drying drum 52 is connected to the discharge end of the primary collection belt 43. The inclined upper end of the primary drying drum 52 is also connected to the primary exhaust chamber 53, and the exhaust end of the primary exhaust chamber 53 is connected to the exhaust gas dust removal system through the primary main flue 54.

[0033] Reference Figure 1 The aforementioned raw hot material metering and conveying system includes a raw hot material elevator 61, a vibrating screen 62, a raw hot material silo 63, a raw hot material scale 64, and a raw hot material conveying pipe 65. The feed end of the raw hot material elevator 61 is connected to the inclined lower end (discharge end) of the raw drying drum 52. The vibrating screen 62 is located above the raw hot material silo 63 and is connected to the discharge end of the raw hot material elevator 61. The vibrating screen 62 is also connected to a raw equipment negative pressure pipe 66. The raw hot material scale 64 is located below the discharge end of the raw hot material silo 63. The raw hot material scale 64 is connected to the mixing cylinder 9 through the raw hot material conveying pipe 65.

[0034] Reference Figure 1 The aforementioned exhaust gas dust removal system includes a primary bag filter 101 and an exhaust fan 102 connected to the exhaust end of the primary bag filter. The other end of the negative pressure pipe 92 of the mixing equipment is connected in parallel with the negative pressure pipe 66 of the primary equipment, and the end of the negative pressure pipe 66 of the primary equipment is connected to the air inlet end of the primary bag filter 101.

[0035] Reference Figure 1The aforementioned asphalt metering and conveying system includes an asphalt scale 71, an asphalt conveying pipe 72, and a 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 cylinder 9. The asphalt conveying pipe is equipped with a butterfly valve 73.

[0036] Reference Figure 1 The powder metering and conveying system includes a powder scale 81, a powder conveying pipe 82, and a 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 cylinder 9. The powder conveying pipe 82 is equipped with a butterfly valve 83.

[0037] The above-mentioned asphalt mixture production equipment includes the following specific production methods:

[0038] (1) When the material is fed, the regulating damper one and regulating damper two are closed and the pneumatic damper is opened. The negative pressure pipe of the mixing equipment draws air into the mixing cylinder, so that the mixing cylinder is in a negative pressure state. The recycled hot material metering and conveying system, the original hot material metering and conveying system and the powder metering and conveying system respectively feed the recycled hot material, the original hot material and the powder into the mixing cylinder.

[0039] (2) Switch the air door, open the air door one and the air door two, close the pneumatic air door, introduce the regenerated exhaust gas into the mixing cylinder, and adjust the opening of the air door one and the air door two to make the mixing cylinder under positive pressure. Then the asphalt metering and conveying system will put the asphalt into the mixing cylinder.

[0040] (3) Start the mixing tank to mix the asphalt with the various aggregates in step (1);

[0041] (4) When the mixing time is over, switch the air damper to close the regulating air damper one and regulating air damper two, open the pneumatic air damper, and open the discharge door of the mixing tank to discharge the material.

[0042] The above are merely specific embodiments of the present invention, but the design concept of the present invention is not limited thereto. Any non-substantial modifications made to the present invention using this concept shall be considered as infringing upon the protection scope of the present invention.

Claims

1. An asphalt mixture production device, comprising a reclaimed material metering conveying system, a reclaimed drying system, a reclaimed hot material metering conveying system, a virgin material metering conveying system, a virgin drying system, a virgin hot material metering conveying system, an asphalt metering conveying system, a powder material metering conveying system, a mixture stirring system, and a tail gas dedusting system; the mixture stirring system comprises a stirring cylinder, a discharge door is arranged on the stirring cylinder, and the reclaimed hot material metering conveying system, the virgin hot material metering conveying system, the asphalt metering conveying system, and the powder material metering conveying system are connected with the stirring cylinder respectively, characterized in that: The stirring cylinder is connected with a stirring device negative pressure pipe, and a pneumatic damper is installed on the stirring device negative pressure pipe; an exhaust outlet end of the regeneration drying system is connected with a regeneration exhaust gas conveying inlet pipe, the regeneration exhaust gas conveying inlet pipe is connected with the stirring cylinder, and an adjusting damper one is arranged on the regeneration exhaust gas conveying inlet pipe; a regeneration exhaust gas conveying outlet pipe is further connected with the stirring cylinder, an adjusting damper two is arranged on the regeneration exhaust gas conveying outlet pipe, and a pressure detection device is further installed on the stirring cylinder; the regeneration drying system comprises a regeneration burner, a regeneration combustion chamber, a regeneration drying cylinder and a regeneration exhaust gas chamber, one end of the regeneration combustion chamber is provided with the regeneration burner, the other end is connected with one end of the regeneration drying cylinder, the other end of the regeneration drying cylinder is connected with the regeneration exhaust gas chamber, and an exhaust end of the regeneration exhaust gas chamber is connected with a regeneration exhaust gas conveying pipe, a fan one is installed on the regeneration exhaust gas conveying pipe, and the end of the regeneration exhaust gas conveying pipe is connected with the primary drying system through a regeneration secondary combustion flue; the end of the regeneration exhaust gas conveying pipe is connected in parallel with the regeneration exhaust gas conveying inlet pipe, and the end of the regeneration exhaust gas conveying outlet pipe is connected with the regeneration combustion chamber through a fan two.

2. An asphalt mixture production plant as claimed in claim 1, characterized in that: The regeneration hot material metering conveying system comprises a regeneration temporary storage bin, a regeneration hot material scale and a regeneration hot material conveying pipe, the regeneration temporary storage bin is connected with the bottom of the regeneration exhaust 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 with the stirring cylinder through the regeneration hot material conveying pipe.

3. An asphalt mixture production plant as claimed in claim 1, characterized in that: The primary drying system comprises a primary burner, a primary drying cylinder and a primary exhaust gas chamber, the primary burner is arranged at the inclined lower end of the primary drying cylinder, the inclined upper end of the primary drying cylinder is connected with the primary hot material metering conveying system, and the inclined upper end of the primary drying cylinder is provided with the primary exhaust gas chamber; and an exhaust end of the primary exhaust gas chamber is connected with the exhaust gas dust removal system through a primary main flue.

4. An asphalt mixture production plant as claimed in claim 3, characterized in that: The primary hot material metering conveying system comprises 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 connected with the discharge end of the primary hot material elevator, and the vibrating screen is further connected with a primary device 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 with the stirring cylinder through the primary hot material conveying pipe.

5. An asphalt mixture production plant as claimed in claim 4, characterized in that: The exhaust gas dust removal system comprises a primary bag-type dust collector and a tail exhaust fan connected with the exhaust end of the primary bag-type dust collector, the other end of the stirring device negative pressure pipe is connected in parallel with the primary device negative pressure pipe, and the end of the primary device negative pressure pipe is connected with the air inlet end of the primary bag-type dust collector.

6. An asphalt mixture production plant as claimed in claim 1, characterized in that: The asphalt metering conveying system comprises an asphalt scale, an asphalt conveying pipe and a butterfly valve, one end of the asphalt conveying pipe is connected with the asphalt scale, the other end is connected with the stirring cylinder, and the butterfly valve is installed on the asphalt conveying pipe.

7. A method of producing an asphalt mixture using the asphalt mixture production apparatus according to claim 1, characterized by, Specifically comprising the following steps: (1) When the material is put in, the first and second adjusting dampers are closed, the pneumatic damper is opened, the negative pressure pipe of the stirring device is used to pump the inside of the stirring cylinder, so that the inside of the stirring cylinder is in a negative pressure state, the regenerated hot material, the original hot material and the powder are respectively put into the stirring cylinder by the regenerated hot material metering and conveying system, the original hot material metering and conveying system and the powder metering and conveying system; (2) The switching damper is switched, the first and second adjusting dampers are opened, the pneumatic damper is closed, the regenerated tail gas is introduced into the stirring cylinder, and the opening degree of the first and second adjusting dampers is adjusted, so that the inside of the stirring cylinder is in a positive pressure state, and then the asphalt is put into the stirring cylinder by the asphalt metering and conveying system; (3) The stirring cylinder is opened for stirring, so that the asphalt is mixed and stirred with the various stones in step (1); (4) When the stirring time is over, the switching damper is switched, the first and second adjusting dampers are closed, the pneumatic damper is opened, and the discharge door of the stirring cylinder is opened for discharging.

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