Preparation equipment of modified asphalt pavement mixture

Abstract

The invention relates to preparation equipment of a modified asphalt pavement mixture. Comprising an engineering vehicle as well as an oil furnace device and a mixing device which are carried by the engineering vehicle, and further comprises a circulating device for circulating hot oil between the oil furnace device and the mixing device, the mixing device comprises a granular material box internally provided with a plurality of material bins, discharging valves are installed on bottom outlets of the material bins of the granular material box, a stirring box with a stirring assembly is installed below the granular material box, a discharging valve is installed on a bottom outlet of the stirring box, a discharging hopper is installed below a bottom outlet of the stirring box, and the mixing device further comprises a powder tank. A conveying assembly for conveying powder in the tank into the stirring box is mounted at the bottom of the powder tank, the heat tracing type asphalt pump is provided with a heat tracing box, and the in-box heat tracing material distribution pipe is mounted at the top of an inner cavity of the stirring box and is provided with a plurality of material distribution bent pipes; a discharging pipe of the heat tracing type asphalt tank is connected with an inlet of the heat tracing type asphalt pump through an out-box heat tracing conveying pipe, an outlet of the heat tracing type asphalt pump is connected with an outer port of the in-box heat tracing distributing pipe through the out-box heat tracing conveying pipe, and the heat tracing type asphalt tank, the out-box heat tracing conveying pipe, the in-box heat tracing distributing pipe and the heat tracing box are connected in series through connecting oil pipelines. And under the action of the circulating device, hot oil circularly flows between the oil cavities of the components and the oil furnace device. The device is vehicle-mounted equipment, on-site preparation of the mixture is achieved, and the requirements for flexibility and timeliness of mixture supply are met.

Description

Technical Field

[0001] The invention belongs to the technical field of road material mixing equipment, and in particular relates to a preparation equipment for modified asphalt road surface mixture. Background Art

[0002] Modified asphalt pavement mixture refers to a modified asphalt mixture used for paving roads. It is an asphalt binder made by adding rubber, resin, high molecular polymer, ground rubber powder or other fillers and other admixtures (modifiers), or taking measures such as mild oxidation of asphalt to improve the performance of asphalt or asphalt mixture. The mixture in modified asphalt needs to be processed and prepared by mixing equipment, and transferred to the construction site for application after reaching the application state.

[0003] Existing processing and preparation equipment is usually fixed equipment, which is set up at the prefabrication site of the road surface, and the prepared modified asphalt mixture is transported to the construction site by engineering vehicles. In some construction scenarios, such as repairing potholes or the construction site is far away from the prefabrication site, people hope to have a mobile and flexible on-site preparation implementation to complete the preparation of the aforementioned mixture, to ensure the flexibility and timeliness of the mixture preparation and on-site use. The existing technology lacks the aforementioned preparation equipment, and needs to be developed and designed according to the needs of the engineering project. Summary of the invention

[0004] The purpose of the present invention is to provide a preparation device for a modified asphalt pavement mixture, so as to realize on-site preparation of the mixture and meet the requirements of flexibility and timeliness of the mixture supply.

[0005] The technical solution adopted by the present invention is: a preparation device for modified asphalt pavement mixture, including an engineering vehicle and an oil furnace device and a mixing device carried by the engineering vehicle, and also including a circulation device for circulating hot oil between the oil furnace device and the mixing device; the mixing device includes a granular material box with multiple silos inside, a discharge valve is installed at the bottom outlet of each silo of the granular material box, a mixing box with a mixing component is installed below the granular material box, a discharge valve is installed at the bottom outlet of the mixing box, a discharge hopper is installed below the bottom outlet of the mixing box, and also includes a powder tank, and a discharge valve is installed at the bottom of the powder tank to discharge the powder in the tank. The conveying assembly for conveying material into the mixing box also includes a heating asphalt tank, a heating asphalt pump with a heating box, and an in-box heating distribution pipe with multiple distribution elbows installed on the top of the inner cavity of the mixing box. The discharge pipe of the heating asphalt tank is connected to the inlet of the heating asphalt pump through the heating delivery pipe outside the box, and the outlet of the heating asphalt pump is connected to the outer port of the heating distribution pipe inside the box through the heating delivery pipe outside the box. The heating asphalt tank, the heating delivery pipe outside the box, the heating distribution pipe inside the box and the heating box are connected in series by using a connecting oil pipeline. Under the action of the circulation device, the hot oil circulates between the oil cavity of the aforementioned components and the oil furnace device.

[0006] Preferably, the external heating delivery pipe includes an external pipe body and an external heating sleeve installed outside the external pipe body, and an oil cavity is formed between the external pipe body and the external heating sleeve; the internal heating material distribution pipe includes a horizontally placed internal pipe body and an internal heating sleeve installed outside the internal pipe body, and an oil cavity is formed between the internal pipe body and the internal heating sleeve, and the lower end of each material distribution elbow of the internal heating material distribution pipe passes through the internal heating sleeve and is connected to the internal pipe body.

[0007] Preferably, the heated asphalt tank includes a first heated asphalt tank and a second heated asphalt tank, two in-box heated distribution pipes are installed inside the mixing box and the two are respectively located on both sides of the conveying component, and two heated asphalt pumps are provided, one of which pumps the asphalt in the first heated asphalt tank, and the other heated asphalt pump pumps the asphalt in the second heated asphalt tank.

[0008] Preferably, the conveying component of the powder tank is a powder conveying auger, the auger sleeve of the powder conveying auger is located inside the mixing box and has multiple discharge ports on the bottom wall, the bottom outlet of the powder tank is docked with the feed port located at the top of the outer end of the auger sleeve, and the auger body located in the auger sleeve is driven by a powder hydraulic motor located outside.

[0009] Preferably, the powder tank comprises a tank body with a tapered bottom, a powder filling port is provided on the top wall of the tank body, a detachable filter bag is installed on the powder filling port to prevent dust from spreading to the outside; a vibrating hydraulic motor is also installed on the outer wall of the powder tank.

[0010] Preferably, the interior of the pellet box is divided into a first pellet bin and a second pellet bin by an inner partition, a first pellet hopper with a first discharge valve at the bottom is installed at the bottom of the first pellet bin, and a second pellet hopper with a second discharge valve at the bottom is installed at the bottom of the second pellet bin; the first discharge valve and the second discharge valve have the same structure, both including a rotatable discharge valve plate and a discharge cylinder for driving the discharge valve plate to rotate and shift; a detachable box cover is installed on the top of the pellet box.

[0011] Preferably, the discharge valve at the bottom of the mixing box includes a rotatable discharge valve plate and a discharge cylinder driving the discharge valve plate to rotate and shift.

[0012] Preferably, the stirring assembly includes a double stirring shaft and a stirring impeller installed in a stirring box, the same side ends of the two stirring shafts are connected by a transmission box, and also includes two stirring hydraulic motors, the output shafts of the two stirring hydraulic motors are respectively connected to the two stirring shafts.

[0013] Preferably, the circulation device comprises two parallel circulation pipelines installed on a base frame, a circulation oil pump and a pressure relief pipeline are installed on the circulation pipelines, and an oil delivery pipeline is connected to the outlets of the two circulation pipelines and a filter is installed on the oil delivery pipeline.

[0014] Preferably, the oil furnace device includes a heat exchange combustion tank installed in a protective frame, a burner is installed on the heat exchange combustion tank, a heat exchange coil is installed inside the heat exchange combustion tank, and an exhaust pipe is provided on the top of the heat exchange combustion tank; it also includes an oil outlet pipeline connected to one end of the heat exchange coil and an oil return pipeline connected to the other end of the heat exchange coil.

[0015] The advantages and positive effects of the present invention are:

[0016] The present invention provides a preparation device for modified asphalt pavement mixture. Compared with the existing fixed equipment, the preparation device in the present invention is constructed based on engineering vehicles, so it has good mobility and flexibility, and can be quickly deployed to the construction site as needed to carry out on-site preparation of modified asphalt pavement mixture. Compared with the method of mixing and prefabrication at the prefabrication site and then transporting and transferring to the construction site by engineering vehicles, the preparation device of the present invention realizes on-site preparation of the mixture, meeting the requirements of flexibility and timeliness of mixture supply. The pavement mixture is discharged downward from the bottom through the discharge hopper and can be directly discharged on the ground for pavement paving, thereby improving the asphalt pavement paving construction efficiency to a certain extent.

[0017] By setting up an oil furnace device and a circulation device, the mixing device is provided with the circulating heating heat source required on site. The fluidity of asphalt is improved by heating the asphalt raw materials. By designing the asphalt tank, the external transportation pipeline, the internal material distribution pipeline and the asphalt pump as a heating type structure, it is ensured that the asphalt raw materials do not cool and solidify during the supply process, and the asphalt raw materials added to the mixing box are kept in a high temperature state, thereby promoting the stirring and mixing effect of the road mixture. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 It is a schematic diagram of the main structure of the present invention;

[0019] Figure 2 yes Figure 1 Schematic diagram of the three-dimensional structure of the intermediate circulation device and the oil furnace device;

[0020] Figure 3 yes Figure 1 Schematic diagram of the three-dimensional structure of the mixing device, from the upper perspective;

[0021] Figure 4 yes Figure 1 Schematic diagram of the three-dimensional structure of the mixing device, bottom viewing angle;

[0022] Figure 5 yes Figure 4 Schematic diagram of the internal structure of the mixing device, bottom view.

[0023] In the figure:

[0024] 1. Engineering vehicle; 2. Circulation device; 2-1. Chassis; 2-2. Oil delivery pipeline; 2-3. Filter; 2-4. Pressure relief pipeline; 2-5. Circulation oil pump; 2-6. Circulation pipeline; 3. Oil furnace device; 3-1. Protection frame; 3-2. Heat exchange combustion tank; 3-3. Burner; 3-4. Oil outlet pipeline; 3-5. Exhaust pipe; 3-6. Oil return pipeline; 4. Mixing device; 4-1. Support frame; 4-2. Powder hydraulic motor; 4-3. Mixing hydraulic motor; 4-4. Mixing box; 4-5. Heat-tracing asphalt pump; 4-6. Granular material box; 4-7, the first heated asphalt tank; 4-8, the second heated asphalt tank; 4-9, the tank cover; 4-10, the powder conveying auger; 4-11, the powder tank; 4-12, the filter bag; 4-13, the transmission box; 4-14, the unloading cylinder; 4-15, the unloading valve plate; 4-16, the unloading hopper; 4-17, the heating conveying pipe outside the box; 4-18, the first pellet hopper; 4-19, the first discharge valve; 4-20, the second pellet hopper; 4-21, the second discharge valve; 4-22, the heating distribution pipe inside the box; 4-23, the connecting oil pipeline; 4-24, the heating box. DETAILED DESCRIPTION

[0025] In order to further understand the content, features and effects of the present invention, the following embodiments are given to explain in detail.

[0026] See also Figure 1 The preparation equipment of the modified asphalt pavement mixture of the present invention comprises an engineering vehicle 1, an oil furnace device 3 and a mixing device 4 carried by the engineering vehicle 1, and a circulation device 2 for circulating hot oil between the oil furnace device 3 and the mixing device 4. Therefore, the preparation equipment is constructed based on the engineering vehicle 1, giving full play to the characteristics of the strong mobility and flexibility of the engineering vehicle 1, the oil furnace device 3 is used to provide a heat source on site, the mixing device 4 is used to mix and prepare the pavement mixture, and the circulation device 2 circulates the hot oil between the oil furnace device 3 and the mixing device 4, continuously transporting heat energy to the mixing device 4, ensuring the fluidity of the asphalt raw material, and ensuring the temperature conditions required for the mixing process.

[0027] See also Figure 2 , we can see that:

[0028] The circulation device 2 includes two parallel circulation pipelines 2-6 installed on a chassis 2-1, a circulation oil pump 2-5 and a pressure relief pipeline 2-4 are installed on the circulation pipeline 2-6, and an oil delivery pipeline 2-2 is connected to the outlets of the two circulation pipelines 2-6 and a filter 2-3 is installed on the oil delivery pipeline 2-2. During installation, the chassis 2-1 of the circulation device 2 is directly installed and fixed on the chassis of the engineering vehicle 1.

[0029] The two circulation pipelines 2-6 and their circulation oil pumps 2-5 form a one-for-one standby system. A pressure relief safety valve is installed on the pressure relief pipeline 2-4 to open the pressure relief valve when the internal oil pressure is too high to ensure the safety of operation. The filter 2-3 is used to continuously filter the circulating hot oil and promptly filter out particulate impurities that may be contained in the hot oil to avoid blockage of the oil circuit.

[0030] See also Figure 2 , we can see that:

[0031] The oil furnace device 3 includes a heat exchange combustion tank 3-2 installed in a protective frame 3-1, a burner 3-3 is installed on the heat exchange combustion tank 3-2, a heat exchange coil is installed inside the heat exchange combustion tank 3-2, and an exhaust pipe 3-5 is provided on the top of the heat exchange combustion tank 3-2. The burner 3-3 is selected as a fuel type burner, using the fuel (gasoline or diesel) of the engineering vehicle 1 as fuel. The burner 3-3 sends fuel and air into the interior of the heat exchange combustion tank 3-2, ignites under the action of the spark plug, and forms high-temperature combustion flue gas. The burner 3-3 is an existing component, which is obtained through purchase, and its structure and function are not described in detail. During installation, the bottom of the protective frame 3-1 is directly mounted and fixed on the chassis of the engineering vehicle 1.

[0032] It also includes an oil outlet pipeline 3-4 connected to one end of the heat exchange coil and an oil return pipeline 3-6 connected to the other end of the heat exchange coil. The heated hot oil is discharged from the oil outlet pipeline 3-4 into the circulation device 2, and the hot oil returned from the mixing device 4 enters the heat exchange coil through the oil return pipeline 3-6 to exchange heat with the high-temperature combustion flue gas inside and heat it up. The heat exchange flue gas exhaust is discharged upward through the exhaust pipe 3-5.

[0033] See also Figure 3 , Figure 4 and Figure 5 , we can see that:

[0034] The mixing device 4 includes a support frame 4-1, and other auxiliary components are installed and fixed inside the support frame 1. During installation, the bottom of the support frame 4-1 is directly installed and fixed on the chassis of the engineering vehicle 1. Specifically, a vertical through window is provided in the rear part of the chassis of the engineering vehicle 1, and the mixing device 4 is located above the window, and the mixed asphalt pavement mixture is discharged downward.

[0035] The mixing device 4 includes a granular material box 4-6 with multiple silos inside, and a discharge valve is installed at the bottom outlet of each silo of the granular material box 4-6. A mixing box 4-4 with a mixing assembly is installed below the granular material box 4-6, a discharge valve is installed at the bottom outlet of the mixing box 4-4, and a discharge hopper 4-16 is installed below the bottom outlet of the mixing box 4-4. The discharge hopper 4-16 is located in a window on the chassis of the aforementioned engineering vehicle 1, forming a longitudinal channel for the road mixture.

[0036] The pellet box 4-6 is used to store pellet raw materials, and different pellet raw materials can be stored in different silos. In this embodiment, the interior of the pellet box 4-6 is divided into a first pellet silo and a second pellet silo by a partition plate inside the box, and a first pellet hopper 4-18 with a first discharge valve 4-19 at the bottom is installed at the bottom of the first pellet silo, and a second pellet hopper 4-20 with a second discharge valve 4-21 at the bottom is installed at the bottom of the second pellet silo, so the pellet box 4-6 in this embodiment can store two kinds of pellet raw materials.

[0037] The first discharge valve 4-19 and the second discharge valve 4-21 have the same structure, both of which include a rotatable discharge valve plate and a discharge cylinder for driving the discharge valve plate to rotate and shift. The discharge valve plate is controlled by the discharge cylinder to make a swinging motion. When it swings outward to disengage from the bottom outlet of the pellet hopper, the outlet opens. Conversely, when it swings inward to completely block the bottom outlet of the pellet hopper, the outlet closes.

[0038] A detachable box cover 4-9 is installed on the top of the pellet box 4-6. When pellet raw materials need to be added to the box, the box cover 4-9 is opened, and the box cover 4-9 is closed after the raw material filling is completed. The box cover 4-9 can seal the top opening of the pellet box 4-6 to prevent foreign matter from entering and the pellets inside from generating dust upward.

[0039] The discharge valve at the bottom of the mixing box 4-4 includes a rotatable discharge valve plate 4-15 and a discharge cylinder 4-14 for driving the discharge valve plate 4-15 to rotate and shift. The discharge valve plate 4-15 is controlled by the discharge cylinder 4-14 to swing. When it swings outward to disengage from the bottom outlet of the mixing box 4-4, the outlet is opened, and the mixed road mixture is discharged into the discharge hopper 4-16 and finally falls on the ground below. On the contrary, when it swings inward to completely block the bottom outlet of the mixing box 4-4, the outlet is closed.

[0040] In this embodiment, the stirring assembly includes a double stirring shaft and a stirring impeller installed in the stirring box 4-4, and the same side ends of the two stirring shafts are connected by a transmission box 4-13. It also includes two stirring hydraulic motors 4-3, and the output shafts of the two stirring hydraulic motors 4-3 are respectively connected to the two stirring shafts. The two stirring hydraulic motors 4-3 are used in one and standby, that is, only one stirring hydraulic motor 4-3 is in operation, and can drive the two sets of double stirring shafts and stirring impellers to rotate through the transmission box 4-13.

[0041] It also includes a powder tank 4-11, at the bottom of which is installed a conveying assembly for conveying the powder in the tank into the mixing box 4-4. The powder tank 4-11 stores powder raw materials, and the conveying assembly conveys and transfers the powder raw materials into the mixing box 4-4.

[0042] In this embodiment, the conveying component of the powder tank 4-11 is a powder conveying auger 4-10, the auger sleeve of the powder conveying auger 4-10 is located inside the mixing box 4-4 and is provided with a plurality of discharge ports on the bottom wall, the bottom outlet of the powder tank 4-11 is docked with the feed port located at the top of the outer end of the auger sleeve, and the auger body located in the auger sleeve is driven by the powder hydraulic motor 4-2 located outside. When feeding, the powder hydraulic motor 4-2 drives the auger body of the powder conveying auger 4-10 to rotate, and the powder in the powder tank 4-11 enters the auger sleeve from the bottom port and is transported by the auger body in a transverse motion, and is finally discharged from the discharge port provided on the bottom wall of the auger sleeve and falls into the mixing box 4-4 below.

[0043] In this embodiment, the powder tank 4-11 includes a tank body with a constricted bottom, a powder filling port is provided on the top wall of the tank body, and a detachable filter bag 4-12 is installed on the powder filling port to prevent dust from spreading to the outside; a vibration hydraulic motor is also installed on the outer wall of the powder tank 4-11. When filling powder, the filter bag 4-12 is removed, and the filter bag 4-12 is installed after filling. The filter bag 4-12 keeps the air pressure inside the tank consistent with that outside the tank, and can prevent the dust formed by the powder from spreading to the outside. The vibration hydraulic motor is used to provide vibration to prevent the problem of powder being blocked in the tank and unable to supply powder smoothly.

[0044] It also includes a heating asphalt tank, a heating asphalt pump 4-5 with a heating box 4-24, and an in-box heating distribution pipe 4-22 with multiple distribution elbows installed on the top of the inner cavity of the mixing box 4-4. The discharge pipe of the heating asphalt tank is connected to the inlet of the heating asphalt pump 4-5 through the out-box heating delivery pipe 4-17, and the outlet of the heating asphalt pump 4-5 is connected to the outer port of the in-box heating distribution pipe 4-22 through the out-box heating delivery pipe 4-17.

[0045] A heating type asphalt tank refers to an asphalt tank with a heating function, specifically, a jacket is provided on the outer wall of the asphalt tank, an oil chamber is formed between the jacket and the asphalt tank, and the high-temperature hot oil in the oil chamber heats the asphalt in the tank, causing the asphalt to melt and ensure fluidity. A heating type asphalt pump 4-5 refers to an asphalt pump with a heating box 4-24 installed in the operating part (volute part) of the asphalt pump, and an oil chamber is formed in the heating box 4-24, and the high-temperature hot oil in the oil chamber heats the asphalt in the pump to maintain fluidity. The external heating delivery pipe 4-17 is used to transport asphalt, and its heating characteristics can keep the internal asphalt fluid. The internal heating distribution pipe 4-22 is used to distribute liquid asphalt in the mixing box 4-4, that is, to disperse the asphalt into the mixing box 4-4 below, and its heating characteristics can keep the internal asphalt fluid.

[0046] In this embodiment, the external heating conveying pipe 4-17 includes an external pipe body and an external heating sleeve installed on the outside of the external pipe body, and an oil cavity is formed between the external pipe body and the external heating sleeve; the internal heating distribution pipe 4-22 includes a horizontally placed internal pipe body and an internal heating sleeve installed on the outside of the internal pipe body, and an oil cavity is formed between the internal pipe body and the internal heating sleeve. The lower end of each distribution elbow of the internal heating distribution pipe 4-22 passes through the internal heating sleeve and is connected with the internal pipe body. When multiple distribution elbows are used to distribute liquid asphalt, since the pipe port is located below the arc portion, it can effectively prevent the granular material falling from above and the dust in the box from entering the distribution elbow to cause blockage.

[0047] In this embodiment, the heating type asphalt tank includes a first heating type asphalt tank 4-7 and a second heating type asphalt tank 4-8. Two heating distribution pipes 4-22 are installed inside the mixing box 4-4 and are located on both sides of the conveying component, specifically on both sides of the powder conveying auger 4-10. Two heating type asphalt pumps 4-5 are provided, one of which pumps the asphalt in the first heating type asphalt tank 4-7, and the other heating type asphalt pump 4-5 pumps the asphalt in the second heating type asphalt tank 4-8. The two groups of heating type asphalt tanks and their heating type asphalt pumps 4-5 constitute one for use and one for backup, which improves the reliability of equipment operation.

[0048] The heating type asphalt tank (including the first heating type asphalt tank 4-7 and the second heating type asphalt tank 4-8), the heating delivery pipe 4-17 outside the box, the heating distribution pipe 4-12 inside the box and the heating box 4-24 are connected in series by the connecting oil pipeline 4-23. Under the action of the circulation device 2, the hot oil circulates between the oil chamber of the aforementioned components and the oil furnace device 3.

[0049] How to run:

[0050] The engineering vehicle 1 moves to the road construction site, and the supporting vehicles such as the granular material supply support vehicle, the asphalt supply support vehicle and the powder material supply support vehicle 1 arrive at the construction site;

[0051] The oil furnace device 3 and the circulation device 2 are started, and the hot oil circulates between the oil furnace device 3 and the mixing device 4. The hot oil serves as a medium to continuously supply the heat energy generated by the oil furnace device 3 to the mixing device 4, so that the asphalt raw material in the mixing device 4 is heated to become liquid to ensure fluidity, and a high temperature environment is provided for the mixing and preparation of the road mixture;

[0052] The granular material in the granular material box 4-6 is directly dropped downward into the mixing box 4-4 by opening the discharge valve at the bottom of the granular material bin, and the powder in the powder tank 4-11 is transferred and transported to the mixing box 4-4 by controlling the operation of the powder conveying auger 4-10. The stirring assembly operates to mix the raw materials in the box, and the asphalt melted into liquid is distributed in a dispersed state into the mixing box 4-4 through the heated distribution pipe 4-22 in the box under the action of the heated asphalt pump 4-5. It is worth noting that the liquid asphalt is gradually distributed into the inside of the mixing box 4-4 during the continuous stirring process; after a certain period of stirring, the internal road surface mixture is prepared, and then the discharge valve is opened and the stirring shaft and the stirring impeller are kept in operation, and the road surface mixture is discharged downward and enters the discharge hopper 4-16, and finally falls on the road surface under the engineering vehicle 1;

[0053] The engineering vehicle 1 is shifted to spread the pavement mixture on the road surface to complete the pavement paving.

Claims

1. A preparation device for modified asphalt pavement mixture, characterized by: Including engineering A vehicle (1) and an oil furnace device (3) and a mixing device (4) carried by the engineering vehicle (1), further comprising a circulation device (2) for circulating hot oil between the oil furnace device (3) and the mixing device (4); the mixing device (4) comprising a pellet box (4-6) with a plurality of silos inside, a discharge valve being installed at the bottom outlet of each silo of the pellet box (4-6), a stirring box (4-4) having a stirring component being installed below the pellet box (4-6), a discharge valve being installed at the bottom outlet of the stirring box (4-4), a discharge hopper (4-16) being installed below the bottom outlet of the stirring box (4-4), a powder tank (4-11), a conveying component for conveying the powder in the tank into the stirring box (4-4) being installed at the bottom of the powder tank (4-11), and a heating device (4-16) for conveying the powder in the tank into the stirring box (4-4) An asphalt tank, a heating asphalt pump (4-5) with a heating box (4-24), and an in-box heating distribution pipe (4-22) installed at the top of the inner cavity of a mixing box (4-4) and having a plurality of distribution elbows. The discharge pipe of the heating asphalt tank is connected to the inlet of the heating asphalt pump (4-5) through an external heating delivery pipe (4-17), and the outlet of the heating asphalt pump (4-5) is connected to the outer port of the in-box heating distribution pipe (4-22) through the external heating delivery pipe (4-17). The heating asphalt tank, the external heating delivery pipe (4-17), the in-box heating distribution pipe (4-22), and the heating box (4-24) are connected in series by a connecting oil pipeline (4-23. Under the action of a circulation device (2), hot oil circulates between the oil cavity of the aforementioned components and an oil furnace device (3).

2. The preparation equipment for modified asphalt pavement mixture according to claim 1, characterized in that: The external heating conveying pipe (4-17) comprises an external pipe body and an external heating sleeve installed outside the external pipe body, and an oil cavity is formed between the external pipe body and the external heating sleeve; the internal heating material distribution pipe (4-22) comprises a horizontally placed internal pipe body and an internal heating sleeve installed outside the internal pipe body, and an oil cavity is formed between the internal pipe body and the internal heating sleeve, and the lower end of each material distribution elbow of the internal heating material distribution pipe (4-22) passes through the internal heating sleeve and is connected to the internal pipe body.

3. The preparation equipment for modified asphalt pavement mixture according to claim 2, characterized in that: The heating type asphalt tank comprises a first heating type asphalt tank (4-7) and a second heating type asphalt tank (4-8). Two in-tank heating distribution pipes (4-22) are installed inside the mixing box (4-4) and are respectively located on both sides of the conveying component. Two heating type asphalt pumps (4-5) are provided, one of which pumps the asphalt in the first heating type asphalt tank (4-7) and the other heating type asphalt pump (4-5) pumps the asphalt in the second heating type asphalt tank (4-8).

4. The preparation equipment for modified asphalt pavement mixture according to claim 3, characterized in that: The conveying component of the powder tank (4-11) is a powder conveying auger (4-10). The auger sleeve of the powder conveying auger (4-10) is located inside the mixing box (4-4) and is provided with a plurality of discharge ports on the bottom wall. The bottom outlet of the powder tank (4-11) is butt-connected with the feed port located at the top of the outer end of the auger sleeve. The auger body located inside the auger sleeve is driven by a powder hydraulic motor (4-2) located outside.

5. The preparation equipment for modified asphalt pavement mixture according to claim 4, characterized in that: The powder tank (4-11) comprises a tank body with a constricted bottom, a powder filling port is arranged on the top wall of the tank body, and a detachable filter bag (4-13) is installed on the powder filling port to prevent dust from spreading to the outside; a vibration hydraulic motor is also installed on the outer wall of the powder tank (4-11).

6. The equipment for preparing modified asphalt pavement mixture according to claim 5, characterized in that: The interior of the pellet box (4-6) is divided into a first pellet bin and a second pellet bin by an inner partition plate; a first pellet hopper (4-18) having a first discharge valve (4-19) at the bottom is installed at the bottom of the first pellet bin, and a second pellet hopper (4-20) having a second discharge valve (4-21) at the bottom is installed at the bottom of the second pellet bin; the first discharge valve (4-19) and the second discharge valve (4-21) have the same structure, both comprising a rotatable discharge valve plate and a discharge oil cylinder for driving the discharge valve plate to rotate and shift; a detachable box cover (4-9) is installed on the top of the pellet box (4-6).

7. The equipment for preparing modified asphalt pavement mixture according to claim 6, characterized in that: The discharge valve at the bottom of the mixing box (4-4) comprises a rotatable discharge valve plate (4-15) and a discharge oil cylinder (4-14) for driving the discharge valve plate (4-15) to rotate and shift.

8. The equipment for preparing modified asphalt pavement mixture according to claim 7, characterized in that: The stirring assembly comprises a double stirring shaft and a stirring impeller installed in a stirring box (4-4), the same-side ends of the two stirring shafts are connected by a transmission box (4-13), and also comprises two stirring hydraulic motors (4-3), the output shafts of the two stirring hydraulic motors (4-3) are respectively connected to the two stirring shafts.

9. The equipment for preparing modified asphalt pavement mixture according to claim 1, characterized in that: The circulation device (2) comprises two parallel circulation pipelines (2-6) installed on a base frame (2-1), a circulation oil pump (2-5) and a pressure relief pipeline (2-4) are installed on the circulation pipeline (2-6), an oil delivery pipeline (2-2) is connected to the outlets of the two circulation pipelines (2-6), and a filter (2-3) is installed on the oil delivery pipeline (2-2).

10. The equipment for preparing modified asphalt pavement mixture according to claim 1, characterized in that: The oil furnace device (3) comprises a heat exchange combustion tank (3-2) installed in a protective frame (3-1), a burner (3-3) installed on the heat exchange combustion tank (3-2), a heat exchange coil installed inside the heat exchange combustion tank (3-2), and an exhaust pipe (3-5) is arranged on the top of the heat exchange combustion tank (3-2); and also comprises an oil outlet pipeline (3-4) connected to one end of the heat exchange coil and an oil return pipeline (3-6) connected to the other end of the heat exchange coil.

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