An asphalt modification reactor and its method

Abstract

The present invention belongs to the technical field of asphalt production, and in particular relates to an asphalt modification reactor and a method thereof, including: a kettle body, inside which a stirring cylinder is rotatably connected, and a plurality of stirring rods fixedly connected to the cylinder wall of the stirring cylinder and distributed in a linear array; a feed inlet and a feeding port are provided on the side wall of the kettle body, an exhaust port is provided at the upper end of the kettle body, a timed exhaust valve is arranged in the exhaust port, and a discharge valve is arranged at the bottom end of the kettle body; a driving mechanism is arranged above the kettle body and is used to drive the stirring cylinder to rotate so as to mix the base asphalt and the modifier evenly. By setting an adjusting mechanism, the present invention can automatically adjust the stirring amplitude according to the air pressure change caused by the temperature change inside the kettle body. When the reaction temperature is too high, the stirring amplitude is reduced to prevent the reaction from being too violent; when the reaction temperature is relatively low, the stirring amplitude is increased to increase the contact opportunity between the modifier and the asphalt and promote the full progress of the reaction.

Description

Technical Field

[0001] The present invention belongs to the technical field of asphalt production, and particularly relates to an asphalt modification reactor and a method thereof. Background Art

[0002] In the field of road construction, asphalt is a key material, and its performance directly affects the quality and service life of roads. Traditional base asphalt has obvious defects when facing complex climates and traffic loads. For example, it is easy to soften at high temperatures, resulting in rutting on the road surface; it becomes brittle at low temperatures, causing cracking; and its poor fatigue resistance leads to premature damage of the road surface. To improve the performance of asphalt, adding modifiers for modification has become a common method, and the asphalt modification reactor is crucial as the core equipment.

[0003] Existing asphalt modification reactors often have the following deficiencies in actual applications:

[0004] On the one hand, it is impossible to adjust the stirring amplitude according to the reaction temperature. When the temperature is too high, if the original stirring amplitude is maintained, the reaction between asphalt and modifier will be too fast, and a large amount of volatile components in asphalt and modifier will volatilize, which not only causes waste of raw materials and increases production costs, but also may pose safety hazards, and at the same time leads to asphalt aging and reduces its performance. When the temperature is too low, if the original stirring amplitude is maintained, the reaction will be slow, the production efficiency will be low, and at the same time, the reaction between asphalt and modifier will be insufficient, reducing the performance and quality stability of the modified asphalt.

[0005] On the other hand, the dispersibility of modifiers (such as rubber powder, polymers, etc.) in asphalt is poor, and they are prone to agglomeration or precipitation. Existing reactors lack effective solutions to the problem of modifier agglomeration, resulting in the formation of relatively large-sized modifier aggregates during the reaction process, seriously affecting the uniformity and performance of the modified asphalt. Summary of the Invention

[0006] The purpose of the present invention is to solve the problems raised in the above background art, and provide an asphalt modification reactor and a method thereof that can automatically adjust the stirring amplitude according to the change in air pressure caused by the temperature change inside the reactor body.

[0007] To achieve the above purpose, the present invention adopts the following technical solutions:

[0008] An asphalt modification reactor, comprising:

[0009] A reactor body, inside which a stirring cylinder is rotatably connected. Multiple groups of stirring rods are fixedly connected to the cylinder wall of the stirring cylinder and are distributed in a linear array. Feed ports and dosing ports are provided on the side wall of the reactor body. An exhaust port is provided at the upper end of the reactor body, and a timed exhaust valve is provided in the exhaust port. A discharge valve is provided at the bottom end of the reactor body;

[0010] A driving mechanism is arranged above the kettle body and is used to drive the stirring cylinder to rotate, so as to mix the matrix asphalt and the modifier evenly.

[0011] An adjusting mechanism is used to adjust the stirring amplitude according to the air pressure change caused by the temperature change inside the kettle body. The adjusting mechanism includes a control cylinder arranged at the upper end of the kettle body. A control cavity communicating with the inside of the kettle body is opened on the bottom wall of the control cylinder. A piston plate is hermetically and slidably connected inside the control cavity. A liquid storage cavity is opened in the control cylinder above the control cavity. A control block is hermetically and slidably connected inside the liquid storage cavity. A push rod is fixedly connected between the control block and the piston plate. A diversion cavity is opened inside the stirring cylinder. An infusion pipe is fixedly communicated between the control cavity and the diversion cavity. A chute is opened inside the stirring rod. An extension rod is hermetically and slidably connected inside the chute. An infusion channel is opened between the diversion cavity and the chute.

[0012] Preferably, the end of the infusion pipe far away from the control cylinder is hermetically and rotatably connected with the stirring cylinder, and the infusion pipe is coaxially arranged with the stirring cylinder.

[0013] Preferably, a liquid storage space is formed among the space below the control block in the control cavity, the infusion pipe, the diversion cavity, the infusion channel and the chute. The liquid storage space is filled with hydraulic oil.

[0014] Preferably, a first spring is arranged between the extension rod and the inner wall of the chute to ensure that the distances of multiple extension rods extending out of the chute are always kept consistent.

[0015] Preferably, a heating and adjusting mechanism is arranged on the extension rod to adjust the temperature inside the kettle body in real time. The heating and adjusting mechanism includes an annular heating sheet fixedly connected to the rod body of the extension rod. The stirring rod is made of heat-insulating material. A power supply device electrically connected to the annular heating sheet is arranged inside the extension rod.

[0016] Preferably, the driving mechanism includes a motor fixedly connected to the upper end of the kettle body. A driving gear is fixedly connected to the output end of the motor. A transmission toothed ring is fixedly connected to the part of the stirring cylinder extending above the kettle body. The driving gear meshes with the transmission toothed ring.

[0017] Preferably, an anti-agglomeration mechanism is further provided at the end of the extension rod for preventing the modifier from agglomerating during the stirring process. The anti-agglomeration mechanism includes a transmission rod rotatably connected to the end of the extension rod and coaxially arranged with the extension rod. A plurality of guide fan blades are fixedly connected to the transmission rod and are distributed in a circumferential array. A transmission box is fixedly connected to the rod body of the extension rod through two U-shaped connecting rods. A bilateral gear is fixedly connected to the part of the transmission rod extending into the transmission box. Tooth teeth are symmetrically arranged on both sides of the bilateral gear. Rack bars are arranged at positions on both sides of the bilateral gear in the transmission box. A second spring is arranged between the rack bar and the inner wall of the transmission box. A connecting rod is fixedly connected to the rack bar. The part of the connecting rod extending outside the transmission box is fixedly connected with a comb-shaped cutting plate. The two comb-shaped cutting plates are symmetrically distributed, and comb-shaped protrusions are arranged in a staggered manner on them.

[0018] Preferably, the positions where the connecting rod penetrates through the transmission box are all sealed.

[0019] A method for preparing modified asphalt using the above asphalt modification reactor includes the following steps:

[0020] S1. Raw material pretreatment: Heat the base asphalt to 140 - 160 °C to completely melt it, inject it into the kettle body through the feed port. At the same time, weigh the modifier according to the proportion and add it into the kettle body through the feeding port. Start the motor in the driving mechanism. The motor drives the driving gear to rotate, and then drives the stirring cylinder and the stirring rod to perform initial stirring at a speed of 80 - 120 r / min, so that the base asphalt and the modifier are preliminarily mixed.

[0021] S2. Reaction temperature increase and stirring amplitude adjustment: Activate the annular heating sheet to gradually raise the temperature inside the kettle body to 170 - 190 °C. When the temperature inside the kettle body exceeds 190 °C, the evaporation rate of the volatile components contained in the asphalt and the modifier increases significantly compared with that in the temperature range of 170 - 190 °C. Specifically, the increase in the evaporation rate exceeds 50% of the average evaporation rate in this range. The internal pressure inside the kettle body is relatively high compared with that at 170 - 190 °C. The internal pressure exceeds 1.2 times the average pressure in this temperature range. The extension rod moves towards the inner side of the chute, so that the stirring amplitude of the stirring rod and the extension rod for the base asphalt and the modifier is reduced compared with that at 170 - 190 °C, and the stirring radius is reduced by 15 - 20 mm to avoid too violent reaction. When the temperature inside the kettle body is lower than 170 °C, the stirring amplitude of the stirring rod and the extension rod for the base asphalt and the modifier is increased compared with that at 170 - 190 °C, and the stirring radius is increased by 15 - 20 mm to increase the contact opportunity between the modifier and the asphalt.

[0022] S3. Temperature dynamic adjustment: Continuously monitor the temperature inside the kettle. When the temperature is higher than 190 °C, the extension rod moves towards the inner side of the chute, causing the length of the annular heating sheet on the extension rod extending out of the chute to decrease compared with when the temperature is between 170 - 190 °C. The extension length decreases by 20 - 30 mm, and the contact area between the annular heating sheet and the matrix asphalt and the modifier decreases compared with when the temperature is between 170 - 190 °C. The contact area decreases by 30 - 40%, reducing the subsequent heating effect. When the temperature is lower than 170 °C, the contact area between the annular heating sheet and the matrix asphalt and the modifier increases compared with when the temperature is between 170 - 190 °C. The contact area increases by 30 - 40%, keeping the reaction temperature stable at 175 - 185 °C;

[0023] S4. Anti - agglomeration treatment: During the stirring process, the guide fan blades rotate under the impact of the matrix asphalt, driving the transmission rod at the end of the extension rod to rotate with the stirring, driving the bilateral gears on it to alternately engage with the racks on both sides, and driving the comb - shaped cutting plate to perform opening and closing movements through the connecting rod to cut and disperse the agglomerated modifier;

[0024] S5. Finished product preparation: Continuously stir for 4 - 6 hours. After the modifier is completely swollen and evenly dispersed, turn off the motor and the annular heating sheet, open the discharge valve at the bottom of the kettle, and transport the modified asphalt to the storage tank through the pipeline to complete the preparation of the modified asphalt.

[0025] Compared with the existing technology, the advantages of this asphalt modification reactor and its method are as follows:

[0026] By setting the adjustment mechanism, the present invention can automatically adjust the stirring amplitude according to the change in air pressure caused by the temperature change inside the kettle. When the reaction temperature is too high, the stirring amplitude is reduced to prevent the reaction from being too violent, avoiding over - reaction of the modifier or aging of the asphalt. When the reaction temperature is relatively low, the stirring amplitude is increased to increase the contact opportunity between the modifier and the asphalt, promoting the full progress of the reaction, and effectively improving the performance and quality stability of the modified asphalt.

[0027] By setting the heating mechanism, the present invention can cooperate with the adjustment mechanism to achieve precise dynamic adjustment of the temperature inside the kettle. Continuously monitor the temperature. When the temperature is higher than the set upper limit, reduce the contact area between the annular heating sheet and the material to reduce the heating effect. When the temperature is lower than the lower limit, increase the contact area to keep the reaction temperature stable in the appropriate range, ensuring that the reaction proceeds under the best temperature conditions, improving production efficiency while ensuring the quality of the modified asphalt.

[0028] By setting the anti - agglomeration mechanism, the present invention can effectively solve the problem of modifier agglomeration. During the stirring process, the guide fan blades drive the transmission rod to rotate, enabling the bilateral gears to cooperate with the racks to drive the comb - shaped cutting plate to perform opening and closing movements, timely dispersing the agglomerated modifier, ensuring the uniform distribution of the modifier in the matrix asphalt, and significantly improving the uniformity and performance of the modified asphalt. Brief Description of the Drawings

[0029] Figure 1 is a schematic three-dimensional structure diagram of the present invention;

[0030] Figure 2 is a schematic sectional structure diagram of the present invention;

[0031] Figure 3 is Figure 2 an enlarged view of part A in

[0032] Figure 4 is a schematic sectional structure diagram of the stirring rod in the present invention;

[0033] Figure 5 is a schematic partial structure diagram of the extension rod in the present invention;

[0034] Figure 6 is a schematic partial structure diagram of the extension rod from another angle in the present invention;

[0035] Figure 7 is a schematic sectional structure diagram of the transmission box in the present invention;

[0036] Figure 8 is a working flowchart of the present invention.

[0037] In the figure:

[0038] 1. Kettle body; 11. Stirring cylinder; 12. Stirring rod; 13. Exhaust port; 14. Discharge valve;

[0039] 2. Driving mechanism; 21. Motor; 22. Driving gear; 23. Driven gear ring;

[0040] 3. Adjusting mechanism; 31. Control cylinder; 32. Control cavity; 33. Piston plate; 34. Liquid storage cavity; 35. Control block; 36. Push rod; 37. Diversion cavity; 38. Liquid delivery pipe; 39. Chute; 310. Extension rod;

[0041] 4. First spring;

[0042] 5. Heating mechanism; 51. Annular heating sheet;

[0043] 6. Anti-agglomeration mechanism; 61. Transmission rod; 62. Diversion fan blade; 63. Transmission box; 64. Bilateral gear; 65. Rack; 66. Second spring; 67. Connecting rod; 68. Comb-shaped cutting plate. Detailed Description of the Preferred Embodiments

[0044] The following embodiments are for illustrative purposes only and are not intended to limit the scope of the present invention.

[0045] Embodiment: Refer to Figures 1 to 8, an asphalt modification reactor, comprising:

[0046] A kettle body 1, inside which a stirring cylinder 11 is rotatably connected. A plurality of stirring rods 12 distributed in a linear array are fixedly connected to the barrel wall of the stirring cylinder 11;

[0047] Specifically, a feed inlet and a feeding port are provided on the side wall of the kettle body 1. The feed inlet is used to inject molten matrix asphalt, and the feeding port is used to add modifiers. An exhaust port 13 is provided at the upper end of the kettle body 1. A timing exhaust valve is provided in the exhaust port 13, whose function is to discharge the excess gas generated by the volatile components in the raw materials due to the temperature rise during the reaction process, maintain the stable air pressure inside the kettle body 1, and avoid potential safety hazards caused by excessive air pressure. A discharge valve 14 is provided at the bottom end of the kettle body 1, which is used to discharge the prepared modified asphalt after the reaction. Opening and closing valves are provided in both the feed inlet and the feeding port, which are used to seal the inside of the kettle body 1 before and after feeding and adding materials, avoid the overflow of raw materials during the reaction process, and maintain the stable air pressure inside the kettle body 1, providing guarantee for subsequently monitoring the temperature change inside the kettle body 1 through air pressure.

[0048] A driving mechanism 2, arranged above the kettle body 1, is used to drive the stirring cylinder 11 to rotate and mix the matrix asphalt and the modifier evenly. The driving mechanism 2 includes a motor 21 fixedly connected to the upper end of the kettle body 1. A driving gear 22 is fixedly connected to the output end of the motor 21. A transmission gear ring 23 is fixedly connected to the part of the stirring cylinder 11 extending above the kettle body 1. The driving gear 22 meshes with the transmission gear ring 23.

[0049] After the motor 21 is started, it drives the driving gear 22 to rotate. Through gear meshing transmission, the stirring cylinder 11 and the stirring rods 12 are driven to rotate, realizing the stirring operation of the materials inside the kettle body 1.

[0050] An adjusting mechanism 3 is used to adjust the stirring amplitude according to the air pressure change caused by the temperature change inside the kettle body 1. The adjusting mechanism 3 includes a control cylinder 31 arranged at the upper end of the kettle body 1. A control cavity 32 communicating with the inside of the kettle body 1 is opened on the bottom wall of the control cylinder 31. A piston plate 33 is hermetically and slidably connected inside the control cavity 32. When the temperature inside the kettle body 1 changes, the air pressure will also change accordingly, and the air pressure change will act on the piston plate 33. A liquid storage cavity 34 is opened at the position above the control cavity 32 inside the control cylinder 31. A control block 35 is hermetically and slidably connected inside the liquid storage cavity 34. A push rod 36 is fixedly connected between the control block 35 and the piston plate 33. A diversion cavity 37 is opened inside the stirring cylinder 11. A liquid infusion pipe 38 is fixedly connected and communicated between the control cavity 32 and the diversion cavity 37. A chute 39 is opened inside the stirring rod 12. An extension rod 310 is hermetically and slidably connected inside the chute 39. A liquid infusion channel is opened between the diversion cavity 37 and the chute 39.

[0051] Specifically, one end of the infusion tube 38 away from the control cylinder 31 is hermetically and rotationally connected to the stirring cylinder 11, and the infusion tube 38 is coaxially arranged with the stirring cylinder 11 to ensure that the infusion tube 38 can normally transport liquid during the rotation of the stirring cylinder 11.

[0052] Specifically, a liquid storage space is formed among the space in the control cavity 32 below the control block 35, the infusion tube 38, the diversion cavity 37, the infusion channel and the chute 39. The liquid storage space is filled with hydraulic oil. By using the incompressibility of the hydraulic oil, the piston plate 33 is pushed through air pressure change, thereby realizing precise control of the extending distance of the extension rod 310 in the chute 39. At the same time, the hydraulic oil used is synthetic ester type hydraulic oil, which has excellent high-temperature stability. Its molecular structure makes it have excellent antioxidant performance at high temperature, can effectively reduce acidic substances and sludge generated by oxidation, and has small viscosity change at high temperature, which can ensure the stable transmission of pressure in the hydraulic system and maintain the accuracy of stirring amplitude adjustment.

[0053] Specifically, a first spring 4 is arranged between the extension rod 310 and the inner wall of the chute 39 to ensure that the extending distances of multiple extension rods 310 extending out of the chute 39 are always the same. When the internal temperature of the kettle body 1 rises, the internal pressure rises, and the rising internal pressure can overcome the gravity of the piston plate 33 and the control block 35. Moreover, the elastic coefficient of multiple first springs 4 is small, ensuring that when the internal pressure changes, the extending distance of the extension rod 310 in the chute 39 can be controlled by hydraulic transmission.

[0054] A heating mechanism 5 is arranged on the extension rod 310 to adjust the temperature inside the kettle body 1 in real time. The heating mechanism 5 includes a circular heating sheet 51 fixedly connected to the rod body of the extension rod 310. The stirring rod 12 is made of heat-insulating material, which can effectively prevent heat dissipation and ensure that the heating effect is concentrated on the materials inside the kettle body 1. A power supply device electrically connected to the circular heating sheet 51 is arranged inside the extension rod 310 to provide power for the circular heating sheet 51 so that it can generate heat, thereby heating the materials inside the kettle body 1 to meet the temperature conditions required for the reaction.

[0055] Specifically, the power supply device electrically connected to the circular heating sheet 51 inside the extension rod 310 uses a high-temperature resistant and miniaturized lithium battery pack as the power supply. This lithium battery pack has a high energy density and good high-temperature resistance, and can work stably in an environment of 170 - 190 °C. Its rated voltage is 24V and the capacity is 5Ah, which can meet the power demand of the circular heating sheet 51 during the reaction. The charging method uses wireless induction charging technology. An induction charging coil is arranged outside the kettle body 1. When the reaction kettle is in a non-working state, the extension rod 310 approaches the charging coil, and wireless charging can be realized, which is convenient and fast.

[0056] The end of the extension rod 310 is also provided with an anti-agglomeration mechanism 6 for preventing the modifier from agglomerating during the stirring process. The anti-agglomeration mechanism 6 includes a transmission rod 61 rotatably connected to the end of the extension rod 310 and coaxially arranged with the extension rod 310. A plurality of guide fan blades 62 distributed in a circumferential array are fixedly connected to the transmission rod 61. During the stirring process, the flowing impact of the matrix asphalt on the guide fan blades 62 causes them to rotate. The rotation of the guide fan blades 62 can not only generate eddy currents to make the material flow more evenly, but also drive the transmission rod 61 at the end of the extension rod 310 to rotate with the stirring. A transmission box 63 is fixedly connected to the rod body of the extension rod 310 through two U-shaped connecting rods. A bilateral gear 64 is fixedly connected to the part of the transmission rod 61 extending into the transmission box 63. Tooth teeth are symmetrically arranged on both sides of the bilateral gear 64. Rack bars 65 are arranged at positions on both sides of the bilateral gear 64 in the transmission box 63. A second spring 66 is arranged between the rack bar 65 and the inner wall of the transmission box 63. A connecting rod 67 is fixedly connected to the rack bar 65. A comb-shaped cutting plate 68 is fixedly connected to the part of the connecting rod 67 extending outside the transmission box 63. The two comb-shaped cutting plates 68 are symmetrically distributed and are provided with staggered comb-shaped protrusions. When the transmission rod 61 rotates, it drives the bilateral gear 64 to alternately engage with the rack bars 65 on both sides, causing the rack bars 65 to reciprocate under the action of the second spring 66, and driving the comb-shaped cutting plate 68 to perform an opening and closing movement through the connecting rod 67 to cut and disperse the agglomerated modifier, ensuring that the modifier is evenly dispersed in the matrix asphalt and improving the quality of the modified asphalt.

[0057] Specifically, the positions where the connecting rod 67 penetrates the transmission box 63 are all sealed to prevent the materials in the kettle body 1 from entering the transmission box 63 and affecting the normal operation of the anti-agglomeration mechanism 6.

[0058] A method for preparing modified asphalt using the above asphalt modification reactor includes the following steps:

[0059] S1. Raw material pretreatment: Heat the matrix asphalt to 140 - 160 °C to make it completely molten, inject it into the kettle body 1 through the feed port. At the same time, weigh the modifier (such as SBS, rubber powder, etc.) according to the proportion and add it into the kettle body 1 through the feeding port. Start the motor 21 in the driving mechanism 2. The motor 21 drives the driving gear 22 to rotate, and then drives the stirring cylinder 11 and the stirring rod 12 to perform initial stirring at a speed of 80 - 120 r / min to preliminarily mix the matrix asphalt and the modifier;

[0060] S2. Reaction Temperature Rise and Stirring Amplitude Adjustment: Start the annular heating sheet 51 and gradually raise the temperature inside the kettle body 1 to 170 - 190 °C. When the temperature inside the kettle body 1 exceeds 190 °C, the evaporation rate of the volatile components contained in the asphalt and the modifier increases significantly compared with that in the temperature range of 170 - 190 °C. Specifically, the increase in the evaporation rate exceeds 50% of the average evaporation rate in this range. The internal pressure inside the kettle body 1 is relatively high compared with that at 170 - 190 °C, and the internal pressure exceeds 1.2 times the average pressure in this temperature range. The extension rod 310 moves inward towards the inner side of the chute 39, causing the stirring amplitude of the stirring rod 12 and the extension rod 310 for the base asphalt and the modifier to decrease compared with that at 170 - 190 °C, and the stirring radius decreases by 15 - 20 mm to avoid overly violent reactions. When the temperature inside the kettle body 1 is lower than 170 °C, the stirring amplitude of the stirring rod 12 and the extension rod 310 for the base asphalt and the modifier increases compared with that at 170 - 190 °C, and the stirring radius increases by 15 - 20 mm, increasing the contact opportunity between the modifier and the asphalt, promoting the reaction, enabling the modifier and the asphalt to fully undergo physical and chemical reactions, and improving the performance of the modified asphalt;

[0061] S3. Temperature Dynamic Adjustment: Monitor the temperature inside the kettle body 1 in real - time. When the temperature is higher than 190 °C, the extension rod 310 moves inward towards the inner side of the chute 39, causing the length of the annular heating sheet 51 extending out from the chute 39 to decrease compared with that at 170 - 190 °C. The extension length decreases by 20 - 30 mm, and the contact area between the annular heating sheet 51 and the base asphalt and the modifier decreases compared with that at 170 - 190 °C. The contact area decreases by 30 - 40%, reducing the subsequent heating effect. When the temperature is lower than 170 °C, the contact area between the annular heating sheet 51 and the base asphalt and the modifier increases compared with that at 170 - 190 °C. The contact area increases by 30 - 40%, keeping the reaction temperature stable at 175 - 185 °C;

[0062] S4. Anti - Agglomeration Treatment: During the stirring process, the guide fan blade 62 rotates under the impact of the base asphalt, driving the transmission rod 61 at the end of the extension rod 310 to rotate with the stirring. The rotation of the guide fan blade 62 can not only generate eddy currents to make the material flow more evenly, but also the rotation of the transmission rod 61 can drive the bilateral gear 64 on it to alternately engage with the racks 65 on both sides, causing the racks 65 to reciprocate under the action of the second spring 66. Through the connecting rod 67, the comb - shaped cutting plate 68 makes opening and closing movements to cut and disperse the agglomerated modifier;

[0063] S5. Finished Product Preparation: Continuously stir for 4 - 6 hours. After the modifier is completely swollen and evenly dispersed, turn off the motor 21 and the annular heating sheet 51, open the discharge valve 14 at the bottom of the kettle body 1, and transport the modified asphalt to the storage tank through the pipeline to complete the preparation of the modified asphalt.

[0064] The above are only the preferred embodiments of the present invention and are not intended to limit the present invention. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principle of the present invention shall be included within the protection scope of the present invention.

Claims

1. An asphalt modification reactor, characterized in that, Comprising: A kettle body (1), inside which a stirring cylinder (11) is rotatably connected. Multiple groups of stirring rods (12) distributed in a linear array are fixedly connected to the cylinder wall of the stirring cylinder (11). A feed inlet and a feeding port are provided on the side wall of the kettle body (1). An exhaust port (13) is provided at the upper end of the kettle body (1), and a timing exhaust valve is arranged in the exhaust port (13). A discharge valve (14) is provided at the bottom end of the kettle body (1); A driving mechanism (2), arranged above the kettle body (1), for driving the stirring cylinder (11) to rotate and mixing the matrix asphalt and the modifier evenly; An adjusting mechanism (3), for adjusting the stirring amplitude according to the air pressure change caused by the temperature change inside the kettle body (1). The adjusting mechanism (3) includes a control cylinder (31) arranged at the upper end of the kettle body (1). A control cavity (32) communicating with the inside of the kettle body (1) is opened on the bottom wall of the control cylinder (31). A piston plate (33) is hermetically and slidably connected inside the control cavity (32). A liquid storage cavity (34) is opened at a position above the control cavity (32) inside the control cylinder (31). A control block (35) is hermetically and slidably connected inside the liquid storage cavity (34). A push rod (36) is fixedly connected between the control block (35) and the piston plate (33). A diversion cavity (37) is opened inside the stirring cylinder (11). A liquid infusion pipe (38) is fixedly connected and communicated between the control cavity (32) and the diversion cavity (37). A chute (39) is opened inside the stirring rod (12). An extension rod (310) is hermetically and slidably connected inside the chute (39). A liquid infusion channel is opened between the diversion cavity (37) and the chute (39); The space below the control block (35) inside the control cavity (32), the liquid infusion pipe (38), the diversion cavity (37), the liquid infusion channel and the chute (39) form a liquid storage space, and the liquid storage space is filled with hydraulic oil; The extension rod (310) is provided with a heating mechanism (5) for adjusting the temperature inside the kettle body (1) in real time. The heating mechanism (5) includes an annular heating sheet (51) fixedly connected to the rod body of the extension rod (310). The stirring rod (12) is made of a heat-insulating material. A power supply device electrically connected to the annular heating sheet (51) is arranged inside the extension rod (310).

2. The asphalt modification reactor according to claim 1, characterized in that, One end of the liquid infusion pipe (38) far away from the control cylinder (31) is hermetically and rotatably connected to the stirring cylinder (11), and the liquid infusion pipe (38) is coaxially arranged with the stirring cylinder (11).

3. The asphalt modification reactor according to claim 2, wherein, A first spring (4) is arranged between the extension rod (310) and the inner wall of the chute (39) to ensure that the distances of multiple extension rods (310) extending out of the chute (39) are always the same.

4. The asphalt modification reactor according to claim 1, characterized in that, The driving mechanism (2) includes a motor (21) fixedly connected to the upper end of the kettle body (1). A driving gear (22) is fixedly connected to the output end of the motor (21). A transmission toothed ring (23) is fixedly connected to the part of the stirring cylinder (11) extending above the kettle body (1). The driving gear (22) and the transmission toothed ring (23) are meshed with each other.

5. The asphalt modification reactor according to claim 4, characterized in that, An anti-agglomeration mechanism (6) is further provided at the end of the extension rod (310) for preventing the modifier from agglomerating during the stirring process. The anti-agglomeration mechanism (6) includes a transmission rod (61) rotatably connected to the end of the extension rod (310) and coaxially arranged with the extension rod (310). A plurality of guide fan blades (62) distributed in a circumferential array are fixedly connected to the transmission rod (61). A transmission box (63) is fixedly connected to the rod body of the extension rod (310) through two U-shaped connecting rods. A bilateral gear (64) is fixedly connected to the part of the transmission rod (61) extending into the transmission box (63). The two sides of the bilateral gear (64) are provided with symmetrically distributed teeth. Rack bars (65) are provided at positions on both sides of the bilateral gear (64) in the transmission box (63). A second spring (66) is provided between the rack bar (65) and the inner wall of the transmission box (63). A connecting rod (67) is fixedly connected to the rack bar (65). The part of the connecting rod (67) extending outside the transmission box (63) is fixedly connected with a comb-shaped cutting plate (68). The two comb-shaped cutting plates (68) are symmetrically distributed, and comb-shaped protrusions are arranged in an alternating manner on them.

6. The asphalt modification reactor according to claim 5, characterized in that, The positions where the connecting rod (67) penetrates through the transmission box (63) are all sealed.

7. A method for preparing modified asphalt using the asphalt modification reactor according to any one of claims 5-6, characterized in that, It includes the following steps: S1. Raw material pretreatment: Heat the matrix asphalt to 140 - 160 °C to make it completely molten, inject it into the kettle body (1) through the feed port. At the same time, weigh the modifier proportionally and add it into the kettle body (1) through the feeding port. Start the motor (21) in the driving mechanism (2). The motor (21) drives the driving gear (22) to rotate, and then drives the stirring cylinder (11) and the stirring rod (12) to perform initial stirring at a speed of 80 - 120 r / min to preliminarily mix the matrix asphalt and the modifier. S2. Reaction temperature increase and stirring amplitude adjustment: Start the annular heating sheet (51) to gradually raise the internal temperature of the kettle body (1) to 170 - 190 °C. When the temperature in the kettle body (1) exceeds 190 °C, the evaporation rate of the volatile components contained in the asphalt and the modifier increases significantly compared with that in the temperature range of 170 - 190 °C. Specifically, the increase in the evaporation rate exceeds 50% of the average evaporation rate in this range. The internal pressure in the kettle body (1) is relatively high compared with that at 170 - 190 °C. The internal pressure exceeds 1.2 times the average pressure in this temperature range. The extension rod (310) moves towards the inner side of the chute (39), so that the stirring amplitude of the stirring rod (12) and the extension rod (310) for the matrix asphalt and the modifier is reduced compared with that at 170 - 190 °C, and the stirring radius is reduced by 15 - 20 mm to avoid too violent reaction. When the temperature in the kettle body (1) is lower than 170 °C, the stirring amplitude of the stirring rod (12) and the extension rod (310) for the matrix asphalt and the modifier is increased compared with that at 170 - 190 °C, and the stirring radius is increased by 15 - 20 mm to increase the contact opportunity between the modifier and the asphalt. S3. Temperature dynamic regulation: The temperature inside the kettle body (1) is monitored in real time. When the temperature is higher than 190 °C, the extension rod (310) moves towards the inner side of the chute (39), so that the length of the annular heating sheet (51) on the extension rod (310) extending out of the chute (39) is reduced compared with that when the temperature is between 170 - 190 °C. The extension length is reduced by 20 - 30 mm. The contact area between the annular heating sheet (51) and the matrix asphalt and the modifier is reduced compared with that when the temperature is between 170 - 190 °C. The contact area is reduced by 30 - 40%, reducing the subsequent heating effect. When the temperature is lower than 170 °C, the contact area between the annular heating sheet (51) and the matrix asphalt and the modifier is increased compared with that when the temperature is between 170 - 190 °C. The contact area is increased by 30 - 40%, keeping the reaction temperature stable at 175 - 185 °C; S4. Anti - agglomeration treatment: During the stirring process, the guide fan blade (62) rotates under the impact of the matrix asphalt, driving the transmission rod (61) at the end of the extension rod (310) to rotate with the stirring, driving the bilateral gear (64) on it to alternately engage with the racks (65) on both sides, and driving the comb - shaped cutting plate (68) to perform an opening and closing movement through the connecting rod (67) to cut and disperse the agglomerated modifier; S5. Finished product preparation: Continuously stir for 4 - 6 hours. After the modifier is completely swollen and evenly dispersed, turn off the motor (21) and the annular heating sheet (51), open the discharge valve (14) at the bottom of the kettle body (1), and transport the modified asphalt to the storage tank through the pipeline to complete the preparation of the modified asphalt.

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