Automatic mixed material regeneration mixing device and mixing method

Abstract

An automated mixture regeneration mixing device and a mixing method, which relate to the field of asphalt mixture mixing. The present invention aims to solve the problems that the asphalt mixture prepared by the existing regenerated asphalt mixture mixing method and mixing device is prone to uneven mixing and insufficient mixing of new and old asphalt. The solid preheating device and the liquid preheating device of the present invention are installed at least at one end of the mixing device, the feed weighing device is installed below the solid preheating device at an angle to the lower right and feeds the mixing device, one end of the spraying device is installed on the liquid preheating device, the other end of the spraying device faces the mixing device and sprays new asphalt or regeneration agent into the mixing device, and the purification device is installed on the right side of the mixing device and purifies the flue gas in the mixing device. Preheating RAP, new aggregate, regeneration agent or new asphalt; premixing; spray mixing; purifying the flue gas generated during the mixing process; discharging. The present invention is used for asphalt mixture regeneration mixing.

Description

Technical Field

[0001] The invention relates to a mixing device and a mixing method, in particular to an automatic mixture regeneration mixing device and a mixing method, and belongs to the technical field of asphalt mixture mixing. Background Art

[0002] The complete miscibility of asphalt regeneration agent or new asphalt with waste asphalt mixture (RAP) is a prerequisite for the full recovery of RAP performance. At present, the asphalt mixture mixer commonly used in indoor tests is more suitable for the preparation of ordinary matrix asphalt mixtures and only has a simple mixing function. In the preparation work, it is necessary to batch the ingredients in advance, and additionally equip multiple ovens to preheat the aggregates, mineral powder and asphalt respectively; when preparing the mixture, the experimenters often use spoons and electronic scales to manually add asphalt or regeneration agents, which not only has a large feeding error, but is also extremely inconsistent with the spraying addition method in the actual mixing process, and the operation is cumbersome, making it difficult to truly simulate the actual feeding and mixing process of the recycled asphalt mixture.

[0003] Existing studies have shown that in the process of mixing recycled asphalt mixture, various factors such as the method of adding regeneration agent, the preheating temperature of new and old materials, and the order of feeding have a significant impact on the road performance of recycled asphalt mixture. For example, when the preheating temperature is too high and the mixing time is too long, the new and old materials cannot be fully mixed, which can easily lead to poor road performance of recycled asphalt mixture; on the contrary, RAP will undergo secondary aging, which will also reduce the regeneration efficiency. Therefore, the asphalt mixture prepared by the mixing method and mixing device that do not conform to the actual conditions is prone to problems such as uneven mixing and insufficient mixing of new and old asphalt, resulting in the failure of the performance test results of the recycled mixture to meet the requirements of road use specifications, and it is difficult to give full play to the regeneration effect of the regeneration agent, thereby affecting the objective evaluation of the performance of the asphalt regeneration agent by researchers. Based on the current technical defects, the present invention proposes a green automated mixture regeneration mixing device and method, which is closer to the engineering conditions of the factory-mixed hot regeneration mixing plant and the on-site hot regeneration mixing vehicle, and is committed to achieving the goals of automated feeding, high mixing efficiency, no smoke pollution, and convenient discharge.

[0004] In summary, the asphalt mixture prepared by the existing mixing method and mixing device of recycled asphalt mixture is prone to uneven mixing and insufficient mixing of new and old asphalt, resulting in the test results of the performance of the recycled mixture failing to meet the requirements of road use specifications, making it difficult to give full play to the regeneration effect of the regeneration agent, thus affecting the objective evaluation of the performance of the asphalt regeneration agent by researchers. Summary of the invention

[0005] The purpose of the present invention is to solve the problem that the asphalt mixture prepared by the existing regenerated asphalt mixture mixing method and mixing device is prone to uneven mixing and insufficient mixing of new and old asphalt. Further, an automatic mixture regeneration mixing device and mixing method are provided.

[0006] The technical solution of the present invention is: an automated mixture regeneration mixing device includes a preheating device, a feeding and weighing device, a spraying device, a mixing device and a purification device, the preheating device includes a solid preheating device and a liquid preheating device, wherein the solid preheating device includes a RAP preheating chamber and an aggregate preheating chamber, the RAP preheating chamber and the aggregate preheating chamber are arranged sequentially from left to right, the solid preheating device and the liquid preheating device are installed at least at one end of the mixing device, the feeding and weighing device is installed below the solid preheating device at an angle to the lower right and supplies the mixing device, one end of the spraying device is installed on the liquid preheating device, the other end of the spraying device faces the mixing device and sprays new asphalt into the mixing device, and the purification device is installed on the right side of the mixing device and purifies the flue gas in the mixing device.

[0007] Furthermore, the liquid preheating device includes a regeneration agent preheating chamber, and the regeneration agent preheating chamber is installed on the right side of the mixing device.

[0008] Furthermore, the liquid preheating device includes an asphalt preheating chamber and a regeneration agent preheating chamber, and the asphalt preheating chamber and the regeneration agent preheating chamber are installed in parallel at the upper end of the RAP preheating chamber.

[0009] Furthermore, the feed weighing device includes an openable and closable discharge port, a conveyor belt, a one-way door and a one-way door stop. The lower ends of the RAP preheating chamber and the aggregate preheating chamber are respectively provided with an openable and closable discharge port. The conveyor belt is located in the shell directly below the RAP preheating chamber and the aggregate preheating chamber, and the conveyor belt is arranged to be inclined to the lower right. The one-way door is installed at the lower part of the left end surface of the mixing device, and the one-way door opens to the right side under the push of the solid material to enter the mixing device. The one-way door stop is installed on the shell, and the one-way door stop is located on the left side of the one-way door to prevent the one-way door from opening to the left.

[0010] Furthermore, the spraying device includes a hydraulic pump, a telescopic tube and a spraying head, one end of the hydraulic pump is connected to the liquid preheating device, the other end of the hydraulic pump is connected to one end of the telescopic tube, and the other end of the telescopic tube is connected to the spraying head.

[0011] Furthermore, the mixing device includes a mixing bin, a rotating shaft, a stirring blade and a driving assembly. The mixing bin is an olive-shaped cylindrical container. The driving assembly is installed on one side of the mixing bin. The rotating shaft is horizontally inserted in the mixing bin, and the rotating shaft and the mixing bin are respectively driven by a driving assembly to achieve rotation. The stirring blade is installed on the rotating shaft; a discharge port is opened at the lower end of the mixing bin.

[0012] Preferably, the stirring blade is a hollow blade, and the stirring blade is connected to the rotating shaft by bolts or threads.

[0013] Furthermore, the purification device includes an electric coke catching device, a smoke inlet pipe and an air outlet pipe, one end of the smoke inlet pipe extends into the mixing bin, the other end of the smoke inlet pipe is connected to the electric coke catching device, and the air outlet pipe is connected to the outlet side of the electric coke catching device.

[0014] The present invention also provides a mixing method using an automated mixed material regeneration mixing device, which comprises the following steps:

[0015] Step 1: Preheat RAP, new aggregate, regeneration agent or new asphalt;

[0016] Step 1: Put RAP and new aggregate into the RAP preheating chamber and aggregate preheating chamber of the solid preheating device respectively, set the preheating temperatures to T1 and T2 respectively, and start rotating heating of the RAP preheating chamber and the aggregate preheating chamber;

[0017] Among them, the preheating temperature T1 is 90-140℃, and T2 is 150-200℃;

[0018] Step 1 and 2: Set the temperature of the mixing device to the mixing temperature T3 for preheating; the mixing temperature T3 is 130-180°C;

[0019] Step 13: Pour the regeneration agent or new asphalt into the liquid preheating device and set the preheating temperature to T4; the preheating temperature T4 is 80-160℃;

[0020] Step 2: Premix;

[0021] Step 21: Open the discharging port on the RAP preheating chamber through the control switch. Assuming that the total mass of a mixed material specimen is M, first let the RAP fall onto the conveyor belt. When the mass is m1, close the discharging port and transport the RAP to the mixing device through the conveyor belt and the one-way door.

[0022] Step 22: Open the discharging port on the aggregate preheating chamber again, so that the new aggregate falls onto the conveyor belt, with a mass of m2, close the discharging port, and transport the new aggregate into the mixing device through the conveyor belt and the one-way door;

[0023] Step 23: Start the rotation function of the mixing device and start pre-mixing. The pre-mixing time is t1;

[0024] Step 3: Spray and mix;

[0025] Step 31: After the mixing is completed, the mixing device stops rotating;

[0026] Step 32: Open the opening and closing window on the top of the mixing bin, or open the spraying door on the left side of the mixing bin, and control the retractable tube to allow the spraying head to penetrate into the mixing device to spray new asphalt or regeneration agent, with a mass of m3;

[0027] Step 33: Start the rotation function of the mixing device again and start spraying and mixing. The spraying and mixing time is t2;

[0028] Step 4: Purify the flue gas generated during the mixing process;

[0029] During the mixing process in the mixing bin, the purification device extracts the flue gas generated in the mixing device through the smoke inlet pipe every 15 seconds, and after being purified by the electric coke collector, it is converted into harmless gas and discharged through the air outlet pipe;

[0030] Step 5: After the mixing is completed, open the discharge port on the mixing bin, take out the mixed recycled asphalt mixture, and conduct subsequent performance tests. At this point, the recycled mixing of the asphalt mixture is completed.

[0031] Furthermore, the added masses of RAP, new aggregate and regenerator in step 2 are m1, m2 and m3 respectively, wherein m1 / M is in the range of 10%-80%, and m3 / m1 is in the range of 0.02%-2%.

[0032] Compared with the prior art, the present invention has the following effects:

[0033] The green automated mixture regeneration mixing device and mixing method provided by the present invention can greatly simplify the mixing work of the regenerated asphalt mixture in the laboratory, improve the mixing efficiency and avoid human errors to a certain extent. The specific beneficial effects can be summarized as follows:

[0034] ① Simple feeding method. The improvement of feeding method is reflected in two aspects. On the one hand, it is no longer necessary to use multiple devices such as ovens, mixers, electronic scales, etc. to achieve mixing. Only one device of the present invention can realize the automation and precision of weighing and feeding. On the other hand, the injection of new asphalt and regeneration agent is optimized from the original pouring method to quantitative spraying, which is convenient for better mixing between new asphalt and regeneration agent and solid materials, further improving the uniformity of mixing, and the mixing of new and old asphalt is more complete.

[0035] ② Improved mixing efficiency. Compared with the blade stirring of the traditional mixer, the stirring blade and the mixing bin of the present invention can rotate together through different driving components, thereby increasing the disturbance of the mixed material and being more conducive to the full mixing and blending of new and old materials;

[0036] ③ Environmental protection and safety. The entire mixing device of the present invention is in a closed state during mixing, and is equipped with a fume treatment device (referring to a purification device), which can avoid environmental pollution and harm to the health of workers caused by the release of asphalt fume during the mixing process, and has good promotion and application value. BRIEF DESCRIPTION OF THE DRAWINGS

[0037] Figure 1It is a schematic diagram of the overall structure when the solid preheating device and the liquid preheating device of the present invention are respectively installed on the left and right sides of the mixing device, and the spraying device is located on the right side of the mixing device at this time;

[0038] Figure 2 It is a schematic diagram of the overall structure when the solid preheating device and the liquid preheating device of the present invention are both located on the left side of the mixing device, and the spraying device is located on the left side of the mixing device at this time.

[0039] Figure 3 It is a schematic diagram of the flow pattern of the mixture in the mixing device. DETAILED DESCRIPTION

[0040] The technical solution of the present invention is not limited to the specific implementation modes listed below, but also includes any reasonable combination of the specific implementation modes.

[0041] Specific implementation method 1: Combination Figure 1 to Figure 2 The present embodiment is described. The present embodiment includes a preheating device, a feed weighing device, a spraying device, a mixing device and a purification device. The preheating device includes a solid preheating device and a liquid preheating device, wherein the solid preheating device includes a RAP preheating chamber 1 and an aggregate preheating chamber 2, and the RAP preheating chamber 1 and the aggregate preheating chamber 2 are arranged sequentially from left to right. The solid preheating device and the liquid preheating device are installed at least at one end of the mixing device. The feed weighing device is installed below the solid preheating device at an angle to the lower right and supplies material to the mixing device. One end of the spraying device is installed on the liquid preheating device, and the other end of the spraying device faces the mixing device and sprays new asphalt into the mixing device. The purification device is installed on the right side of the mixing device and purifies the flue gas in the mixing device.

[0042] The solid preheating device in this embodiment is fixed to the left side of the mixing device, and is a cylindrical container. The cylindrical container is divided into two left and right chambers, which can be independently temperature-controlled, wherein the RAP preheating chamber 1 is used to hold RAP material, and the aggregate preheating chamber 2 is used to hold new aggregate; the cylindrical container has both heating and rotation functions, and the heating function can be achieved by automatic temperature control heating through a resistance wire or a heating tube, and the rotation function is generally achieved through an independent drive component, which can be shared with the drive component of the mixing device, and can also be achieved through a separate drive component, which can be achieved in the form of a motor and a gear pair, which can ensure that the RAP and the new aggregate are heated more evenly.

[0043] In addition, the feeding method of the present invention adopts automatic weighing and feeding, and regeneration agent spraying. Specifically, accurate quantitative weighing is achieved through a feeding weighing device and the material is automatically fed by a conveyor belt, and then the regeneration agent is sprayed through a spraying device to improve the uniformity of the mixed material.

[0044] The mixing efficiency of the present invention is greatly improved, which is achieved by rotating the rotating shaft and the mixing bin in the mixing device respectively, wherein the rotating shaft and the mixing bin rotate in opposite directions, the rotating speed range of the rotating shaft is 10 to 500 r / min, and the rotating speed range of the mixing bin is 10 to 200 r / min. Figure 3 As shown in the figure, it can be seen that under the action of the stirring blades, the flow direction of the mixture is parallel to the rotation axis and flows axially. Driven by the rotation of the mixing bin itself, the mixture can flow in a direction perpendicular to the rotation axis. The two work together to improve the mixing efficiency of the recycled asphalt mixture, which is conducive to the full integration of new and old materials and improves the recycling effect.

[0045] The present invention can also achieve environmentally friendly smokeless mixing, which is specifically embodied in that the entire mixing process of the present invention is carried out in a closed container, and a smoke purification device is used to treat the smoke generated during the mixing process, ensuring that the discharged smoke is harmless.

[0046] The present invention provides a discharge port at the bottom of the mixing bin to directly discharge the materials. This discharge method is simpler and has a fast discharge speed.

[0047] Specific implementation method 2: Combination Figure 1 To explain this embodiment, the liquid preheating device of this embodiment includes a regeneration agent preheating chamber 4, and the regeneration agent preheating chamber 4 is installed on the right side of the mixing device.

[0048] In this arrangement, the liquid preheating device is fixed to the right side of the mixing device, and the regeneration agent preheating chamber 4 is preferably an independent chamber with heating and temperature control, which is used to contain the asphalt regeneration agent or new asphalt, and is connected to the spraying device, through which the asphalt regeneration agent or new asphalt in a liquid state is sprayed onto the solid material. Other components and connection relationships are the same as those in the first embodiment.

[0049] Specific implementation method three: Combination Figure 2 The present embodiment is described. The liquid preheating device of the present embodiment includes an asphalt preheating chamber 3 and a regeneration agent preheating chamber 4 . The asphalt preheating chamber 3 and the regeneration agent preheating chamber 4 are installed in parallel at the upper end of the RAP preheating chamber 1 .

[0050] In this way, the asphalt preheating chamber 3 and the regeneration agent preheating chamber 4 are both independent chambers, which are used to contain new asphalt and regeneration agent respectively, and the new asphalt and regeneration agent are sprayed simultaneously under the action of the spraying device. Other components and connection relationships are the same as those of the first or second specific implementation.

[0051] Specific implementation method four: Combination Figure 1 to Figure 2To illustrate the present embodiment, the feed weighing device of the present embodiment comprises an openable and closable discharge port 5, a conveyor belt 6, a one-way door 8 and a one-way door stop 7. An openable and closable discharge port 5 is respectively installed at the lower end of the RAP preheating chamber 1 and the aggregate preheating chamber 2. The conveyor belt 6 is located in the shell directly below the RAP preheating chamber 1 and the aggregate preheating chamber 2, and the conveyor belt 6 is arranged to be inclined to the lower right. The one-way door 8 is installed at the lower part of the left end surface of the mixing device, and the one-way door 8 opens to the right side to enter the mixing device under the push of the solid material. The one-way door stop 7 is installed on the shell, and the one-way door stop 7 is located on the left side of the one-way door 8 to prevent the one-way door 8 from opening to the left.

[0052] In this way, the feed weighing device in this embodiment is composed of a discharge device and a weighing and conveying device. The discharge device is located at the bottom of the cylinder wall of the cylindrical container of the solid preheating device, that is, the bottom of the cylinder wall of the RAP preheating chamber 1 and the aggregate preheating chamber 2, and is two slidable opening and closing discharge ports 5, which can be freely opened and closed by controlling the switch;

[0053] The weighing and conveying device is a conveyor belt device with a mass sensor embedded inside, which weighs the mass of the RAP and new aggregate falling from the openable and closable discharge port 5 through the mass sensor, and conveys the preheated RAP and new aggregate to the mixing device through the conveyor belt 6. Other components and connection relationships are the same as those of the specific embodiments one, two or three.

[0054] The one-way door stopper 7 in this embodiment is a rectangular one-way door stopper, which realizes the one-way transmission of RAP and new aggregate to the mixing device, and effectively avoids the backflow of the mixed material in the mixing device.

[0055] Specific implementation method five: Combination Figure 1 to Figure 2 The spraying device of this embodiment includes a hydraulic pump 20, a telescopic tube and a spraying head 21. One end of the hydraulic pump 20 is connected to the liquid preheating device, the other end of the hydraulic pump 20 is connected to one end of the telescopic tube, and the other end of the telescopic tube is connected to the spraying head 21.

[0056] With such a configuration, the telescopic tube can be freely retracted and is resistant to high temperatures. The new asphalt and regeneration agent in the liquid preheating device are transported to the spray head 21 through the telescopic tube under the action of the hydraulic pump 20, and sprayed into the mixing device through the spray head 21. The spray head 21 preferably has a spray angle greater than 90°, with a large spraying area. While ensuring the spraying efficiency, it can also improve the uniformity of mixing. The other components and connection relationships are the same as any one of the specific embodiments one to four.

[0057] Specific implementation method six: Combination Figure 1 to Figure 2To illustrate this embodiment, the mixing device of this embodiment includes a mixing bin 22, a rotating shaft 23, a stirring blade 11 and a driving assembly. The mixing bin 22 is an olive-shaped cylindrical container. The driving assembly is installed on one side of the mixing bin 22. The rotating shaft 23 is horizontally rotatably inserted in the mixing bin 22, and the rotating shaft 23 and the mixing bin 22 are respectively driven by a driving assembly to achieve rotation. The stirring blade 11 is installed on the rotating shaft 23; a discharge port 13 is opened at the lower end of the mixing bin 22.

[0058] In this arrangement, the mixing bin 22 is an olive-shaped cylindrical container, and an opening and closing window 24 is provided on the top of the mixing bin 22 to facilitate the nozzle of the spraying device to penetrate and spray. This situation is suitable for Figure 1 A spraying door 9 may also be installed on the upper left side of the mixing bin 22, the spraying door 9 is a one-way spraying door for spraying the mixing device mounted on the fixed preheating device, see Figure 2 , and a spray check valve 10 is provided on the upper wall of the spray door 9, and the spray check valve 10 is used to prevent the spray door 9 from opening to the left. A discharge port 13 is provided at the bottom of the mixing bin 22 for discharging materials;

[0059] The rotating shaft 23 in this embodiment is arranged at the central axis position of the cylindrical container, which can drive the entire cylindrical container to rotate; the fixed end of the stirring blade 11 has threads, which can be fixed to the rotating shaft by a bolt structure, and is easy to disassemble and replace. The other components and connection relationships are the same as any one of the specific embodiments 1 to 5.

[0060] In addition, when the solid preheating device realizes the rotation function, the rotating shaft in the solid preheating device can drive the rotating shaft 23 of the mixing device, thereby saving power and simplifying the structure.

[0061] The discharge port 13 in this embodiment is located at the bottom of the cylindrical container of the mixing device, and is a discharge window that can be slidably opened and closed. After the window is opened, the recycled mixed material can fall out under the action of gravity.

[0062] Specific implementation method seven: Combination Figure 1 to Figure 2 To explain this embodiment, the stirring blade 11 of this embodiment is a hollow blade, and the stirring blade 11 is connected to the rotating shaft 23 by bolts or threads.

[0063] Such arrangement can reduce the adhesion of the recycled mixed material on the mixing blades during the mixing process and avoid loss. The other components and connection relationships are the same as any one of the specific implementation modes 1 to 6.

[0064] When the stirring paddle 11 in this embodiment is actually used, it is preferably a rectangular paddle, and the rectangular paddle is inclined to one side and installed on the rotating shaft 23, preferably inclined to the right by 30° to 60°. At this time, the contact area between the rectangular paddle and the mixing material is increased, and the mixing is further sufficient. Moreover, the number of the stirring paddles 11 is preferably 2 to 8, and they are installed at equal intervals in a spiral manner on the rotating shaft 23. In addition, the rectangular paddle can also be a hollow paddle in the shape of "日".

[0065] Specific Embodiment VIII: Combining Figure 1 to Figure 2 To illustrate this embodiment, the purification device of this embodiment includes an electrostatic precipitator 15, a smoke inlet pipe 14, and an air outlet pipe 16. One end of the smoke inlet pipe 14 extends into the mixing bin 22, the other end of the smoke inlet pipe 14 is connected to the electrostatic precipitator 15, and the air outlet pipe 16 is connected to the outlet side of the electrostatic precipitator 15.

[0066] With such a setting, the purification device is located on the right side of the mixing device, the air inlet is connected to the side wall of the cylindrical container of the mixing device, and the smoke inlet pipe 14 is connected to the electrostatic precipitator 15; the electrostatic precipitator 15 is used to treat and convert polluted gases. Other compositions and connection relationships are the same as any one of Specific Embodiments I to VII.

[0067] An automatic mixture recycling and mixing device in the present invention further includes a moving device. The moving device includes four support legs 18 and universal wheels 17. The support legs 18 are arranged at the four corners of the cylindrical container of the mixing device to support the entire device; the universal wheels 17 are respectively fixed at the bottoms of the support legs 18 to facilitate the movement of the position.

[0068] Specific Embodiment IX: Combining Figure 1 to Figure 2 To illustrate this embodiment, the mixing method of this embodiment includes the following steps:

[0069] Step 1: Preheat the RAP, new aggregates, regenerant, or new asphalt;

[0070] Step 1-1: Put the RAP and new aggregates into the RAP preheating chamber 1 and the aggregate preheating chamber 2 of the solid preheating device respectively, and set the preheating temperatures to T1 and T2 respectively, and start rotating heating for the RAP preheating chamber 1 and the aggregate preheating chamber 2;

[0071] Among them, the preheating temperature T1 is 90-140°C, and T2 is 150-200°C;

[0072] Step 1-2: Set the temperature of the mixing device to the mixing temperature T3 and preheat it; the mixing temperature T3 is 130-180°C;

[0073] Step 1-3: Pour the regenerant or new asphalt into the liquid preheating device and set the preheating temperature to T4; the preheating temperature T4 is 80-160°C;

[0074] Step 2: Premix;

[0075] Step 21: Open the openable and closable discharge port 5 on the RAP preheating chamber 1 through the control switch. Assuming that the total mass of a mixed material specimen is M, first let the RAP fall onto the conveyor belt 6. When the mass is m1, close the openable and closable discharge port 5, and transport the RAP to the mixing device through the conveyor belt 6 and the one-way door 8;

[0076] Step 22: Open the discharging port 5 on the aggregate preheating chamber 2 again, so that the new aggregate falls onto the conveyor belt 6, with a mass of m2, close the discharging port 5, and transport the new aggregate into the mixing device through the conveyor belt 6 and the one-way door 8;

[0077] Step 23: Start the rotation function of the mixing device and start pre-mixing. The pre-mixing time is t1;

[0078] Step 3: Spray and mix;

[0079] Step 31: After the mixing is completed, the mixing device stops rotating;

[0080] Step 32: Open the opening and closing window 24 on the top of the mixing bin 22, or open the spraying door 9 on the left side of the mixing bin 22, and control the telescopic tube to allow the spraying head 21 to penetrate into the mixing device to spray new asphalt or regeneration agent, with a mass of m3;

[0081] Step 33: Start the rotation function of the mixing device again and start spraying and mixing. The spraying and mixing time is t2;

[0082] Step 4: Purify the flue gas generated during the mixing process;

[0083] During the mixing process of the mixing bin 22, the purifier extracts the flue gas generated in the mixing device through the smoke inlet pipe 14 every 15 seconds, purifies it through the electric coke collector 15, converts it into harmless gas and discharges it through the air outlet pipe 16;

[0084] Step 5: After the mixing is completed, the discharge port 13 on the mixing bin 22 is opened, and the regenerated asphalt mixture after mixing is taken out for subsequent performance tests. At this point, the regeneration mixing of the asphalt mixture is completed.

[0085] The mixing times t1 and t2 in step 23 and step 33 of this embodiment can be adjusted accordingly according to the actual mixing conditions, wherein t1 and t2 should be controlled within the range of 60-180s.

[0086] Specific implementation method ten: Combination Figure 1 to Figure 2To illustrate this embodiment, the added masses of RAP, new aggregate and regenerator in step 2 of this embodiment are m1, m2 and m3 respectively, wherein m1 / M is in the range of 10%-80%, and m3 / m1 is in the range of 0.02%-2%.

[0087] In this way, the amount of RAP in the recycled asphalt mixture is consistent with the RAP ratio in the current actual road regeneration project, which can not only ensure the performance of the recycled asphalt mixture, but also try to study the large-proportion RAP recycled asphalt mixture. The other components and connection relationships are the same as any one of the specific implementation methods one to nine.

[0088] Combination Figure 1 and Figure 2 The mixing embodiment of the present invention is described:

[0089] A mixing method of an automated mixed material regeneration mixing device, the specific steps of the embodiment are as follows:

[0090] Step 1: Place RAP and new aggregate into the corresponding chambers of the solid preheating device, set the preheating temperatures to 110°C and 170°C respectively, and start rotary heating; set the temperature of the mixing device to the mixing temperature of 150°C for preheating; pour new asphalt into the liquid preheating device and set the preheating temperature to 155°C.

[0091] Step 2: Open the discharge window at the bottom of the preheating device through the control switch. Assuming that the total mass of a mixture specimen is 1200g, first let the RAP fall onto the conveyor belt. When the mass is 360g, close the window and transport the RAP to the mixing device through the conveyor belt and the one-way door. Then open the discharge window and let the new aggregate fall onto the conveyor belt. The mass is 794.4g. Close the window and transport the new aggregate to the mixing device through the conveyor belt and the one-way door. Start the rotation function of the mixing device and start mixing for a certain time of 90s.

[0092] Step 3: After the mixing is completed, the mixing device stops rotating, the opening and closing window on the top is opened, and the spray nozzle is inserted into the mixing device by controlling the retractable catheter to spray new asphalt or regeneration agent with a mass of 45.6g; the rotation function of the mixing device is started again, and mixing begins for a certain time of 90s.

[0093] Step 4: During the mixing process, the purification device extracts the flue gas generated in the mixing device through the smoke inlet pipe every 15 seconds, and converts it into harmless gas for discharge after being purified by the electric coke capture device.

[0094] Step 5: After mixing, open the discharging device, take out the mixed recycled asphalt mixture, and use the Marshall compactor and rutting instrument to form test pieces for subsequent rutting tests, water immersion Marshall tests, freeze-thaw splitting tests, low-temperature beam and other performance tests.

[0095] A recycled asphalt mixture A with a RAP content of 30% was prepared by the above method, and a recycled asphalt mixture B prepared by a conventional laboratory mixer was used as a control group. As shown in Table 1, the road performance test results of the two mixtures were compared.

[0096] Table 1 Comparison of key road performance

[0097]

[0098] It can be seen from Table 1 that under the same mixture ratio, mixing temperature and mixing time, compared with the recycled mixture prepared by the traditional mixer, the recycled mixture mixed by the present invention has better anti-rutting performance, anti-cracking performance and water damage resistance, and the RAP performance improvement effect is more significant, which shows that the mixing efficiency provided by the mixing device of the present invention is higher, which is conducive to the full diffusion and mixing of new and old materials.

[0099] The above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit the same. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that the technical solutions described in the aforementioned embodiments may still be modified, or some of the technical features may be replaced by equivalents. However, these modifications or replacements do not deviate the essence of the corresponding technical solutions from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims

1. A mixing method using an automated mixed material regeneration mixing device, wherein the automated mixed material regeneration mixing device comprises a preheating device, a feed weighing device, a spraying device, a mixing device and a purification device, The preheating device includes a solid preheating device and a liquid preheating device, wherein: The solid preheating device comprises a RAP preheating chamber (1) and an aggregate preheating chamber (2), the RAP preheating chamber (1) and the aggregate preheating chamber (2) are arranged in sequence from left to right, the solid preheating device and the liquid preheating device are installed at least at one end of the mixing device, the feed weighing device is installed at the bottom of the solid preheating device and tilted to the lower right, and supplies material to the mixing device, one end of the spraying device is installed on the liquid preheating device, and the other end of the spraying device faces the mixing device and sprays new asphalt or regeneration agent into the mixing device, and the purification device is installed on the right side of the mixing device and purifies the flue gas in the mixing device; The feed weighing device comprises an openable and closable discharge port (5), a conveyor belt (6), a one-way door (8) and a one-way door stopper (7); the lower ends of the RAP preheating chamber (1) and the aggregate preheating chamber (2) are respectively provided with an openable and closable discharge port (5); the conveyor belt (6) is located in a shell directly below the RAP preheating chamber (1) and the aggregate preheating chamber (2), and the conveyor belt (6) is arranged tilted to the lower right; the one-way door (8) is installed at the lower part of the left end surface of the mixing device, and the one-way door (8) is opened to the right side under the push of solid material to enter the mixing device; the one-way door stopper (7) is installed on the shell, and the one-way door stopper (7) is located on the left side of the one-way door (8) to prevent the one-way door (8) from opening to the left; The spraying device comprises a hydraulic pump (20), a telescopic tube and a spraying head (21), one end of the hydraulic pump (20) is connected to the liquid preheating device, the other end of the hydraulic pump (20) is connected to one end of the telescopic tube, and the other end of the telescopic tube is connected to the spraying head (21); The mixing device comprises a mixing bin (22), a rotating shaft (23), a stirring blade (11) and a driving assembly. The mixing bin (22) is an olive-shaped cylindrical container. The driving assembly is installed on one side of the mixing bin (22). The rotating shaft (23) is inserted into the mixing bin (22) for horizontal rotation. The rotating shaft (23) and the mixing bin (22) are respectively driven by a driving assembly to realize rotation. The stirring blade (11) is installed on the rotating shaft (23). A discharge port (13) is provided at the lower end of the mixing bin (22). The purification device comprises an electric coke catching device (15), a smoke inlet pipe (14) and an air outlet pipe (16), one end of the smoke inlet pipe (14) extends into the mixing bin (22), the other end of the smoke inlet pipe (14) is connected to the electric coke catching device (15), and the air outlet pipe (16) is connected to the outlet side of the electric coke catching device (15); It is characterized in that the mixing method comprises the following steps: Step 1: Preheat RAP, new aggregate, regeneration agent or new asphalt; Step 11: RAP and new aggregate are placed in the RAP preheating chamber (1) and the aggregate preheating chamber (2) of the solid preheating device, respectively, and the preheating temperatures are set to T1 and T2 respectively, and the RAP preheating chamber (1) and the aggregate preheating chamber (2) are started to be rotated and heated; Among them, the preheating temperature T1 is 90-140℃, and T2 is 150-200℃; Step 1 and 2: Set the temperature of the mixing device to the mixing temperature T3 for preheating; the mixing temperature T3 is 130-180°C; Step 13: Pour the regeneration agent or new asphalt into the liquid preheating device and set the preheating temperature to T4; the preheating temperature T4 is 80-160℃; Step 2: Premix; Step 21: Open the closable discharge port (5) on the RAP preheating chamber (1) through the control switch. Assuming that the total mass of a mixed material sample is M, first let the RAP fall onto the conveyor belt (6). When the mass is m1, close the closable discharge port (5) and transport the RAP to the mixing device through the conveyor belt (6) and the one-way door (8); Step 22: Open the discharging port (5) on the aggregate preheating chamber (2) again, so that the new aggregate falls onto the conveyor belt (6) with a mass of m2, close the discharging port (5), and transport the new aggregate to the mixing device through the conveyor belt (6) and the one-way door (8); Step 23: Start the rotation function of the mixing device and start pre-mixing. The pre-mixing time is t1; Step 3: Spray and mix; Step 31: After the mixing is completed, the mixing device stops rotating; Step 32: Open the opening and closing window (24) on the top of the mixing bin (22), or open the spraying door (9) on the left side of the mixing bin (22), and control the telescopic tube to allow the spraying head (21) to penetrate into the mixing device to spray new asphalt or regeneration agent, with a mass of m3; Step 33: Start the rotation function of the mixing device again and start spraying and mixing. The spraying and mixing time is t2; Step 4: Purify the flue gas generated during the mixing process; During the mixing process of the mixing bin (22), the purifying device extracts the flue gas generated in the mixing device through the flue gas inlet pipe (14) every 15 seconds, purifies the flue gas through the electric coke collector (15), converts the gas into harmless gas and discharges the gas through the air outlet pipe (16); Step 5: After the mixing is completed, the discharge port (13) on the mixing bin (22) is opened to take out the mixed recycled asphalt mixture and conduct subsequent performance tests. At this point, the recycled mixing of the asphalt mixture is completed.

2. The mixing method according to claim 1, characterized in that: The added masses of RAP, new aggregate and regenerator in step 2 are m1, m2 and m3 respectively, wherein m1 / M is in the range of 10%-80%, and m3 / m1 is in the range of 0.02%-2%.

3. The mixing method according to claim 1, characterized in that: The liquid preheating device comprises a regeneration agent preheating chamber (4), and the regeneration agent preheating chamber (4) is installed on the right side of the mixing device.

4. The mixing method according to claim 1, characterized in that: The liquid preheating device comprises an asphalt preheating chamber (3) and a regeneration agent preheating chamber (4), and the asphalt preheating chamber (3) and the regeneration agent preheating chamber (4) are installed in parallel at the upper end of the RAP preheating chamber (1).

5. The mixing method according to claim 1, characterized in that: The stirring blade (11) is a hollow blade, and the stirring blade (11) is connected to the rotating shaft (23) via bolts or threads.

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