Modified asphalt preparation device with global uniform constant-temperature heating function

Abstract

The invention relates to the technical field of oil bath devices, and provides a global uniform constant-temperature heating modified asphalt preparation device which comprises a heating barrel, a partition plate, a stirrer and a sample barrel, the partition plate comprises an annular plate and a funnel, the annular plate is fixedly arranged in the heating barrel, and an oil leakage hole is formed in the annular plate; the funnel is fixedly arranged on the bottom side of the annular plate, the interior of the funnel is communicated with the oil leakage hole, and the inner diameter of the funnel is in a big-end-up shape; the stirrer is rotationally arranged in the heating barrel and located below the partition plate. The sample barrel is detachably fixed on the heating barrel and is arranged in the annular plate in an abutting manner. By arranging the annular plate and the funnel with the thick upper part and the thin lower part, oil liquid can be added into the heating barrel along the oil leakage hole and the funnel, and fluctuation of the liquid level of the oil liquid caused by the stirrer can be weakened, so that the temperature uniformity of the oil liquid in the heating barrel is improved, and smooth proceeding of a modified asphalt preparation experiment is guaranteed.

Description

Technical Field

[0001] The present invention relates to the technical field of oil bath devices, and particularly to a modified asphalt preparation device with globally uniform constant temperature heating. Background Art

[0002] When preparing modified asphalt indoors, heating and heat preservation of asphalt are basic experimental condition requirements. Equipment for heating and heat preservation of asphalt indoors includes direct heating method, oil bath method, and sand bath method. Among them, the direct heating method is extremely prone to uneven heating, which will cause over-aging of asphalt. At the same time, the asphalt layer in direct contact with the heat source will form a hard shell surface layer, resulting in the gas volatilized from the continuously melting asphalt hitting the hard shell surface layer instantaneously, generating an explosion phenomenon. The oil bath method and the sand bath method have the same principle and achieve heating by wrapping asphalt with a plastic medium. Their heating uniformity is far better than that of the direct heating method. In particular, the oil bath method is widely used in the preparation of modified asphalt.

[0003] An existing oil bath device, such as a constant temperature oil bath device disclosed in the utility model with the publication number CN222709705U, is provided with an oil bath pot and an inner tank detachably placed inside the oil bath pot. An oil bath cavity is provided inside the inner tank. A fixed pile is provided at the bottom of the oil bath cavity, and a stirring rod is rotatably installed on the fixed pile. A plurality of stirring blades are distributed at intervals along the circumferential direction of the stirring rod, and the stirring blades are used to stir the oil liquid to increase the heating efficiency of the oil liquid and ensure relatively uniform heating degree of the device.

[0004] However, when stirring the oil liquid with the stirring blades, the liquid level of the oil liquid will fluctuate, increasing the contact area between the oil liquid and the outside air, resulting in a large difference in temperature between the liquid level of the oil liquid and the oil liquid at the bottom of the device, making it difficult to achieve the expected performance of the prepared modified asphalt, especially polymer modified asphalt and reactive modified asphalt. Summary of the Invention

[0005] In view of this, the present invention provides a modified asphalt preparation device with globally uniform constant temperature heating, which can improve the temperature uniformity of the oil liquid in the heating barrel and ensure the smooth progress of the modified asphalt preparation experiment.

[0006] The technical solution of the present invention is realized as follows: The present invention provides a modified asphalt preparation device with globally uniform constant temperature heating, including a heating barrel, a partition plate, a stirrer, and a sample barrel. Among them,

[0007] The partition plate includes an annular plate and a funnel. The annular plate is fixedly arranged inside the heating barrel. Heating wires are arranged inside both the heating barrel and the annular plate, and an oil leakage hole is provided inside the annular plate. The funnel is fixedly arranged at the bottom side of the annular plate, and its interior is communicated with the oil leakage hole, and the inner diameter of the funnel is in a shape of being larger at the top and smaller at the bottom.

[0008] The agitator is rotatably arranged in the heating barrel and is located below the partition board;

[0009] The sample barrel is detachably fixed on the heating barrel and is abutted and arranged within the ring plate.

[0010] Based on the above technical solutions, preferably, the upper end inside the funnel is circular and has the same cross-section as the oil leakage hole;

[0011] The lower end inside the funnel is oblong.

[0012] More preferably, the length direction of the lower end inside the funnel is the first direction;

[0013] The radial direction of the ring plate at the center point position of the lower end inside the funnel is the second direction, and the first direction, the second direction and the axial direction of the ring plate are perpendicular to each other pairwise.

[0014] Based on the above technical solutions, preferably, it further includes a protective cover, and the protective cover includes an outer cover, a first limiting plate, a second limiting plate and a spring, wherein,

[0015] The outer cover is arranged outside the funnel and abuts against the lower end of the funnel, and a communication hole is arranged inside the outer cover;

[0016] The first limiting plate is fixedly arranged inside the outer cover and is slidably connected to the funnel;

[0017] The second limiting plate is detachably fixed on the funnel and is slidably arranged inside the outer cover;

[0018] The spring is abutted and arranged between the first limiting plate and the second limiting plate.

[0019] More preferably, the funnel includes a connection end and a water leakage end, wherein,

[0020] One end of the connection end is fixedly arranged on the bottom side of the ring plate and is communicated with the oil leakage hole. The connection end is of a cylindrical structure, and the connection end is slidably arranged inside the first limiting plate, and the second limiting plate is detachably fixed on the connection end;

[0021] One end of the water leakage end is fixedly arranged at the end of the connection end far from the ring plate and is communicated with it. The inner diameter of the water leakage end gradually decreases from top to bottom, and the outer cover abuts against the lower end of the water leakage end.

[0022] More preferably, the outer cover includes a cover body and a frustum, wherein,

[0023] The cover body abuts against the lower end of the funnel and is connected to the first limiting plate and the second limiting plate;

[0024] The frustum is fixedly arranged at the lower end outside the cover body, the outer diameter of the frustum gradually increases from top to bottom, and the oil leakage hole is opened in the cover body and the frustum.

[0025] More preferably, one end of the communication hole close to the funnel is located below the other end far from the funnel.

[0026] On the basis of the above technical solutions, preferably, the stirrer includes a turntable and stirring blades, wherein,

[0027] The turntable is rotatably arranged in the heating barrel and is located below the sample barrel, and an installation hole is provided in the turntable;

[0028] The stirring blades are fixedly arranged in the installation hole, and their fixed positions are adjustable.

[0029] More preferably, the stirring blades include a rotating shaft, a central plate and spiral plates, wherein,

[0030] The rotating shaft is fixedly arranged in the installation hole in a rotatable manner;

[0031] The central plate is fixedly arranged on the rotating shaft;

[0032] The spiral plates are respectively fixedly arranged at both ends of the central plate, and the spiral plates at both ends of the central plate are centrosymmetric about the center point of the central plate.

[0033] On the basis of the above technical solutions, preferably, it further includes three temperature detection devices, the temperature detection devices are fixedly arranged on the ring plate, and the heights of the three temperature detection devices are different.

[0034] The modified asphalt preparation device with globally uniform constant temperature heating of the present invention has the following beneficial effects compared with the prior art:

[0035] (1) By arranging the ring plate and the funnel with a thick upper part and a thin lower part, not only can the oil liquid be added into the heating barrel along the oil leakage hole and the funnel, but also the fluctuation of the oil liquid level caused by the stirrer can be weakened, thereby improving the temperature uniformity of the oil liquid in the heating barrel and ensuring the smooth progress of the modified asphalt preparation experiment;

[0036] (2) By setting the lower end of the funnel to be oblong and restricting its length direction, the amount of oil liquid moving from below the partition plate to above the partition plate can be reduced. By arranging the protective cover, the exchange of oil liquid above and below the partition plate can be avoided, thereby further enhancing the temperature uniformity of the oil liquid;

[0037] (3) By arranging spiral plates at both ends of the central plate, the oil fluid can circulate vertically, thus improving the stirring effect of the stirrer. Description of the Drawings

[0038] In order to more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the following will briefly introduce the drawings required for use in the description of the embodiments or the prior art. Obviously, the following drawings are only some embodiments of the present invention. For those of ordinary skill in the art, without creative efforts, other drawings can be obtained based on these drawings.

[0039] Figure 1 Is a perspective view of a modified asphalt preparation device with global uniform constant temperature heating according to the present invention;

[0040] Figure 2 Is a sectional view of a modified asphalt preparation device with global uniform constant temperature heating according to the present invention;

[0041] Figure 3 Is a perspective view of the heating barrel in a modified asphalt preparation device with global uniform constant temperature heating according to the present invention;

[0042] Figure 4 Is a perspective view of the partition in a modified asphalt preparation device with global uniform constant temperature heating according to the present invention;

[0043] Figure 5 Is Figure 4 The enlarged view of part A in

[0044] Figure 6 Is Figure 4 The exploded view of part B in

[0045] Figure 7 Is a sectional view of the funnel in a modified asphalt preparation device with global uniform constant temperature heating according to the present invention;

[0046] Figure 8 Is a perspective view of the stirrer in a modified asphalt preparation device with global uniform constant temperature heating according to the present invention;

[0047] Figure 9 Is a perspective view of the stirring blades in a modified asphalt preparation device with global uniform constant temperature heating according to the present invention;

[0048] Figure 10 Is a perspective view of the connection position between the heating barrel and the sample barrel in a modified asphalt preparation device with global uniform constant temperature heating according to the present invention.

[0049] Wherein: 1. Heating barrel; 2. Partition board; 21. Ring plate; 22. Funnel; 221. Connection end; 222. Water leakage end; 201. Oil leakage hole; 3. Stirrer; 31. Turntable; 32. Stirring blade; 321. Rotating shaft; 322. Central plate; 323. Spiral plate; 301. Mounting hole; 4. Sample barrel; 5. Protective cover; 51. Outer cover; 511. Cover body; 512. Frustum; 52. First limiting plate; 53. Second limiting plate; 54. Spring; 501. Communication hole; 6. Temperature detection device. Detailed implementation manners

[0050] The technical solutions in the present invention will be clearly and completely described below in conjunction with the specific implementation manners of the present invention. Obviously, the described implementation manners are only a part of the implementation manners of the present invention, rather than all the implementation manners. All other implementation manners obtained by those of ordinary skill in the art based on the implementation manners in the present invention without creative efforts belong to the scope of protection of the present invention.

[0051] Traditional asphalt is a colloidal substance composed of asphaltene molecular clusters wrapped by resin. The balance between its two states (sol and gel) depends on the interaction between asphaltene and resin and is strongly affected by the external temperature. Asphalt has significant thermal sensitivity. It is solid or semi-solid at room temperature and melts easily with increasing temperature. This thermal sensitivity hinders the asphalt mixture from showing good performance at high and low temperatures. With the growth of traffic volume and the continuous increase in the proportion of heavy vehicles, the service life of traditional asphalt pavements will continuously decrease. In order to improve the product performance of asphalt and meet the usage requirements under different working conditions throughout the year, it is a feasible method to select certain polymer aggregates to change the characteristics of traditional asphalt and prepare modified asphalt.

[0052] Temperature is one of the important conditions for the preparation of modified asphalt. Firstly, temperature can affect the state of asphalt. An increase in temperature will break the gel state of asphalt and cause the asphalt molecular clusters to evolve into a sol state. An appropriate temperature can keep the asphalt in a state convenient for mixing with the modifier, ensuring the smooth progress of the modification process. Secondly, temperature can affect the reaction rate of modified asphalt. Temperature is an important factor affecting the chemical reaction rate. During the preparation of modified asphalt, appropriately increasing the temperature can accelerate the reaction rate between the modifier and asphalt, enabling the modifier to disperse better in the asphalt and improving the modification effect. However, too high a temperature may cause the modifier to decompose or other side reactions to occur, affecting the performance of modified asphalt. Finally, temperature can affect the performance of modified asphalt. Improper temperature control will affect the final performance of modified asphalt. If the temperature is too low, the modifier and asphalt may not react sufficiently, resulting in poor modification effects. For example, if the reaction between rubber powder and asphalt is not sufficient, it is easy to form a simple physical blend, making the rubber powder modified asphalt prone to segregation and having poor system stability. And if the temperature is too high, the asphalt may age, reducing its flexibility, viscosity and other properties. In summary, during the preparation of modified asphalt, an appropriate temperature needs to be maintained.

[0053] As Figure 2 shown, a modified asphalt preparation device with globally uniform constant temperature heating according to the present invention includes a heating barrel 1, a partition 2, a stirrer 3, a sample barrel 4, a protective cover 5 and a temperature detection device 6.

[0054] The heating barrel 1 is used to store the oil liquid. A heating wire is arranged in the heating barrel 1 to heat the oil liquid in the heating barrel 1 until the oil liquid is heated to the specified temperature. The sample barrel 4 is used to hold the raw materials of modified asphalt. The sample barrel 4 is detachably fixed on the heating barrel 1, and the raw materials in the sample barrel 4 are heated and kept warm by the oil liquid in the heating barrel 1, providing the required temperature conditions for the preparation experiment of modified asphalt.

[0055] When heating the oil liquid with the heating wire on the heating barrel 1, the temperature of the part of the oil liquid close to the electric heating wire rises relatively fast, its density becomes smaller and it rises. The temperature of the part of the oil liquid far from the electric heating wire is lower, its density is larger and it drops, forming natural convection. This heat convection is used to achieve the slow heating of the oil liquid.

[0056] The stirrer 3 is rotatably arranged in the heating barrel 1. The stirrer 3 is used to stir the oil liquid in the heating barrel 1, accelerating the flow of the oil liquid, enabling the oil liquid with a higher temperature and the oil liquid with a lower temperature to be quickly mixed. The hot oil liquid quickly diffuses the higher heat to the low-temperature area with the higher heat, and the cold oil liquid can get closer to the electric heating wire to obtain heat faster, thereby enhancing the effect of heat convection and making the temperature of the whole oil liquid more uniform.

[0057] Under the stirring action of the stirrer 3, large fluctuations will occur at the liquid level of the oil. Compared with the calm liquid level, the contact area between the oil and the air increases, resulting in an increased cooling rate of the upper-layer oil, causing temperature non-uniformity in the oil and affecting the preparation of modified asphalt.

[0058] Due to the presence of the stirrer 3, the flow of the oil can be accelerated. Therefore, the length of the heating wire in the heating barrel 1 can be appropriately reduced. For example, heating wires can be provided only above and below the heating barrel 1, and not in the middle position of the heating barrel 1.

[0059] To reduce the fluctuation effect of the stirrer 3 on the oil, the partition plate 2 is set to include an annular plate 21. The annular plate 21 is in the shape of a circular ring plate structure. The annular plate 21 is fixedly arranged in the heating barrel 1 and is located above the stirrer 3. The sample barrel 4 is abutted and arranged inside the annular plate 21, and heating wires are arranged inside the annular plate 21. When preparing modified asphalt, let the oil submerge the annular plate 21. The rotation of the stirrer 3 will only stir the oil below the annular plate 21, and will not cause fluctuations in the liquid level of the oil. At the same time, the upper-layer oil is heated by the heating wires inside the partition plate 2, thereby improving the temperature uniformity of the oil in the heating barrel 1 to a certain extent.

[0060] To facilitate the addition of oil into the heating barrel 1, an oil leakage hole 201 is opened in the annular plate 21, so that the oil above the annular plate 21 flows into the lower part of the annular plate 21 through the oil leakage hole 201. However, the oil below the annular plate 21 will flow through the oil leakage hole 201 to the upper part of the annular plate 21 after being stirred by the stirrer 3, resulting in fluctuations at the liquid level of the oil. For this reason, the partition plate 2 is set to include a funnel 22. The inner diameter of the funnel 22 is larger at the top and smaller at the bottom. The funnel 22 is fixedly arranged on the bottom side of the annular plate 21, and its interior is connected to the oil leakage hole 201. The oil can be smoothly added to the lower part of the annular plate 21 through the funnel 22, and the oil below the annular plate 21 is not easy to flow along the funnel 22 to the upper part of the annular plate 21.

[0061] As Figure 5 shown, the upper end inside the funnel 22 is circular and has the same cross-section as the oil leakage hole 201. The lower end inside the funnel 22 is oblong, and the width of the lower end of the funnel 22 is very small, so that the oil above the funnel 22 can smoothly flow into the lower part of the funnel 22, and the oil below the funnel 22 is not easy to flow back to the upper part of the funnel 22, so as to reduce the fluctuations caused by the stirrer 3 at the liquid level of the oil and improve the temperature uniformity of the oil in the heating barrel 1.

[0062] Assume that the length direction at the lower end inside the funnel 22 is the first direction, and the radial direction of the ring plate 21 located at the center point position at the lower end inside the funnel 22 is the second direction. The first direction, the second direction, and the axial direction of the ring plate 21 should be perpendicular to each other pairwise. When the stirrer 3 drives the oil to rotate around the axial direction of the ring plate 21, the length of the lower end of the funnel 22 along the oil rotation direction is extremely small, so that it is very difficult for the oil below the ring plate 21 to flow through the funnel 22 to the upper side of the ring plate 21.

[0063] The protective cover 5 can completely prevent the oil below the ring plate 21 from flowing to the upper side of the ring plate 21. As Figure 6 and Figure 7 shown, the protective cover 5 includes an outer cover 51, a first limiting plate 52, a second limiting plate 53, and a spring 54. The outer cover 51 is arranged outside the funnel 22 and abuts against the lower end of the funnel 22. A communication hole 501 is provided inside the outer cover 51. The first limiting plate 52 is fixedly arranged inside the outer cover 51 and is slidably connected to the funnel 22. The second limiting plate 53 is detachably fixed on the funnel 22 and is slidably arranged inside the outer cover 51. The spring 54 is sleeved on the funnel 22, and its two ends respectively abut against the first limiting plate 52 and the second limiting plate 53. When the oil flows into the funnel 22 from the oil leakage hole 201, the gravity of the oil will drive the outer cover 51 to move downward, so that the outer cover 51 is separated from the lower end of the funnel 22, and the oil inside the funnel 22 can flow through the communication hole 501 to the position below the ring plate 21 inside the heating barrel 1; as the liquid level of the oil below the ring plate 21 rises, the outer cover 51 will be immersed in the oil. The oil exerts a buoyancy force on the outer cover 51, and together with the elastic force of the spring 54 on the first limiting plate 52, it can drive the outer cover 51 to move upward, so that the outer cover 51 blocks the lower end of the funnel 22 again, preventing the oil from flowing from one side of the ring plate 21 to the other side.

[0064] As Figure 6 shown, the funnel 22 includes a connection end 221 and a water leakage end 222. One end of the connection end 221 is fixedly arranged on the bottom side of the ring plate 21 and is communicated with the oil leakage hole 201. The connection end 221 is of a cylindrical structure, and the connection end 221 is slidably arranged inside the first limiting plate 52. The second limiting plate 53 is detachably fixed on the connection end 221. One end of the water leakage end 222 is fixedly arranged at the end of the connection end 221 far from the ring plate 21 and is communicated with it. The inner diameter of the water leakage end 222 gradually decreases from top to bottom, and the outer cover 51 abuts against the lower end of the water leakage end 222. By setting the connection end 221 to be of a cylindrical structure, the first limiting plate 52 can be evenly slidably arranged on the connection end 221, avoiding lateral shaking of the outer cover 51 during use.

[0065] Preferably, a clamping post is arranged on the circumferential side of the connection end 221, and a sliding groove is arranged on the outer cover 51, so that the clamping post is slidably connected in the sliding groove, improving the connection stability between the outer cover 51 and the funnel 22; at the same time, preferably, a ring-shaped structure with a wedge-shaped cross-section is arranged on the circumferential side of the connection end 221, such as Figure 7 shown. When the protective cover 5 needs to be used, the protective cover 5 is pressed on the funnel 22, so that the wedge-shaped ring structure on the circumferential side of the connection end 221 can pass through the first limiting plate 52 and the second limiting plate 53 in sequence, and the bottom side of the second limiting plate 53 is abutted, improving the installation convenience of the protective cover 5 and realizing the detachable connection between the second limiting plate 53 and the connection end 221.

[0066] such as Figure 7 shown, the outer cover 51 includes a cover body 511 and a frustum 512. The cover body 511 is abutted against the lower end of the funnel 22 and is connected to the first limiting plate 52 and the second limiting plate 53. The frustum 512 is fixedly arranged at the lower end of the outside of the cover body 511. The outer diameter of the frustum 512 gradually increases from top to bottom, and the oil leakage hole 201 is arranged in the cover body 511 and the frustum 512, so that the area of the lower end surface of the outer cover 51 can be increased, which can not only improve the buoyancy of the oil received by the outer cover 51, but also improve the pressure of the oil received by the lower end surface of the outer cover 51, enhancing the sealing performance between the outer cover 51 and the lower end of the funnel 22.

[0067] One end of the communication hole 501 close to the funnel 22 is located below the end of the communication hole 501 far from the funnel 22. On the one hand, it can reduce the amount of oil flowing back into the inner part of the outer cover 51, and on the other hand, it can make a certain amount of oil remain in the outer cover 51 to form a liquid seal structure, enhancing the sealing performance between the outer cover 51 and the funnel 22; in order to improve the function of the communication hole 501, preferably, a plurality of communication holes 501 are arranged, and the plurality of communication holes 501 are arranged in a circumferential array about the axis of the outer cover 51.

[0068] Similarly, preferably, a plurality of oil leakage holes 201 and a plurality of protective covers 5 are arranged, and the plurality of oil leakage holes 201 and the plurality of protective covers 5 are arranged in a circumferential array about the axis of the heating barrel 1, and the plurality of oil leakage holes 201 and the plurality of protective covers 5 correspond to each other one by one.

[0069] The temperature detection device 6 is used to detect the temperature of the oil, ensuring accurate temperature support for the preparation of modified asphalt.

[0070] Corresponding small holes are formed in the ring plate 21, and the temperature detection device 6 is inserted and fixed in the small holes on the ring plate 21. When adding oil, the small holes can be used to discharge the air below the ring plate 21 to avoid the existence of air below the ring plate 21. After the oil addition is completed, the temperature detection device 6 is fixed in the small holes and fixed.

[0071] Preferably, three temperature detection devices 6 are provided. The three temperature detection devices 6 are at different heights. One temperature detection device 6 is used to detect the temperature of the oil in the bottom of the heating barrel 1, one temperature detection device 6 is used to detect the temperature of the oil at the middle position in the heating barrel 1, and one temperature detection device 6 is used to detect the temperature of the oil at the baffle 2, so as to ensure the temperature uniformity of the oil in the heating barrel 1 and provide a stable temperature environment for the heating and heat preservation of the modified asphalt.

[0072] With the above structure, the temperature of the oil in the heating barrel 1 can be kept uniform. For this purpose, the temperature detection device 6 for detecting the middle position in the heating barrel 1 is set as a mercury thermometer. The mercury thermometer has a high measurement accuracy and can be accurate to 0.1 °C, which can provide relatively reliable data for the experiment. The other two temperature detection devices 6 can be set as thermocouples. They have a relatively fast response to temperature changes and can detect whether there is a temperature difference in the oil in time. At the same time, the mercury thermometer can also prevent the temperature of the heat-conducting oil from getting out of control due to the failure of the thermocouple and can correct the thermocouple at any time.

[0073] As Figure 10 shown, preferably, a clamping groove is provided on the heating barrel 1, and a clamping rod is provided on the sample barrel 4. By the clamping connection between the clamping rod and the clamping groove, the rapid installation of the sample barrel 4 is realized. Preferably, both the clamping rod and the clamping groove are provided in three, and the three clamping grooves and the three clamping rods are arranged in a circumferential array around the axis of the heating barrel 1, and the three clamping grooves and the three clamping rods correspond to each other one by one.

[0074] Since the viscosity of asphalt is relatively large, if the sample barrel 4 is not fixed firmly, during stirring, the sample barrel 4 will gradually rotate in the stirring direction, resulting in a decrease in stirring efficiency and being extremely unsafe. This device can well solve this problem by using the simple method of the clamping rod and the clamping groove without the need for additional complex fixing devices. That is, when placing and extracting the sample barrel 4, only need to vertically put it in and lift it, and it can ensure that the sample barrel 4 will not rotate during stirring, and the operation is very convenient. In addition, to prevent scalding during the test, an annular heat-insulating layer is provided on the outer side of the heating barrel 1. When preparing the modified asphalt, the outer wall temperature of the heating barrel 1 is lower than 60 °C, which can not only prevent excessive heat dissipation but also ensure that the outer layer temperature will not be too high to cause scalding. At the same time, a heat-insulating layer is also provided on the bottom side of the heating barrel 1.

[0075] To facilitate the taking and placing of the sample barrel 4, a handle can also be provided on the sample barrel 4.

[0076] As Figure 2 and Figure 8As shown in the figure, the stirrer 3 includes a turntable 31 and stirring blades 32. The turntable 31 is rotatably arranged in the heating barrel 1 and fixedly connected to the output end of a driving device such as a speed reducer. The turntable 31 is located below the sample barrel 4. An installation hole 301 is provided in the turntable 31, and the stirring blades 32 are fixedly arranged in the installation hole 301. When the speed reducer is started, the stirring blades 32 can be driven to rotate, so as to realize the stirring of the oil liquid in the heating barrel 1.

[0077] Preferably, the fixed position and fixed angle of the stirring blades 32 with respect to the installation hole 301 are adjustable, so that a part of the stirring blades 32 can be moved transversely to the interval between the heating barrel 1 and the sample barrel 4, so that the oil liquid between the heating barrel 1 and the sample barrel 4 can be fully stirred; the inclination angle of the stirring blades 32 can also be adjusted, so as to realize different stirring intensities for the oil liquid.

[0078] As Figure 9 shown in the figure, the stirring blades 32 include a rotating shaft 321, a central plate 322 and spiral plates 323. The rotating shaft 321 is rotatably arranged in the installation hole 301 and fixedly connected by bolts. The central plate 322 is fixedly arranged on the rotating shaft 321. The spiral plates 323 are respectively fixedly arranged at both ends of the central plate 322, and the spiral plates 323 at both ends of the central plate 322 are centrosymmetric about the center point of the central plate 322; when the speed reducer drives the turntable 31 to rotate, the central plate 322 can apply a stable and uniform stirring force to the oil liquid below the sample barrel 4, while the spiral plates 323 at both ends of the central plate 322 can respectively apply spiral stirring forces in opposite directions to the oil liquid below the sample barrel 4 and the oil liquid between the heating barrel 1 and the sample barrel 4. The two-direction stirring forces make the oil liquid form two circulations, thereby further improving the temperature uniformity of the oil liquid.

[0079] The usage method of a modified asphalt preparation device with global uniform constant temperature heating according to the present invention is as follows:

[0080] S1, Inject a certain amount of heat-conducting oil into the heating barrel 1 so that the liquid level of the heat-conducting oil covers the partition plate 2, and ensure that the heat-conducting oil will not overflow from the heating barrel 1 after the sample barrel 4 is placed.

[0081] S2, Energize the heating wires in the heating barrel 1 and the partition plate 2 to let the heating wires heat the heat-conducting oil; at the same time, start the speed reducer to rotate the turntable 31, and let the stirrer 3 stir the heat-conducting oil.

[0082] S3, Utilize the temperature of the heat-conducting oil detected by the temperature detection device 6 and the control of the heating wires to keep the temperature of the heat-conducting oil at 180°C; at this time, the real-time temperature of the heat-conducting oil detected by the temperature detection device 6 is maintained within the range of (180±3)°C.

[0083] S4. Add the matrix asphalt heated to 140 °C into the sample bucket 4, and then add a certain amount of modifier into the sample bucket 4.

[0084] S5. Place the sample bucket 4 on the heating bucket 1 to make them fixedly connected, and wait for the real-time temperature of the heat transfer oil to return within the range of (180 ± 3) °C.

[0085] S6. Use a blender to stir the materials in the sample bucket 4 to prepare modified asphalt. The rotation speed is 5000 r / min and the stirring time is 30 min. During this period, the temperature difference between the upper and lower parts of the heat transfer oil detected by the temperature detection device 6 does not exceed 5 °C, and the temperature difference between the middle position of the heat transfer oil and the upper and lower parts of the heat transfer oil does not exceed 4 °C. Moreover, during the stirring process, ensure that the sample bucket 4 does not shake or shift.

[0086] The above is only the preferred embodiment of the present invention and is 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 in the protection scope of the present invention.

Claims

1. A modified asphalt preparation device with globally uniform constant-temperature heating, characterized in that: It includes a heating barrel (1), a partition plate (2), a stirrer (3) and a sample barrel (4). Among them, the partition plate (2) includes an annular plate (21) and a funnel (22). The annular plate (21) is fixedly arranged inside the heating barrel (1). Heating wires are arranged both inside the heating barrel (1) and the annular plate (21), and an oil leakage hole (201) is provided inside the annular plate (21); the funnel (22) is fixedly arranged on the bottom side of the annular plate (21), its interior is communicated with the oil leakage hole (201), and the inner diameter of the funnel (22) is large at the top and small at the bottom; the stirrer (3) is rotatably arranged inside the heating barrel (1) and is located below the partition plate (2); the sample barrel (4) is detachably fixed on the heating barrel (1) and is abutted and arranged inside the annular plate (21).

2. The modified asphalt preparation device for globally uniform constant-temperature heating according to claim 1, characterized in that: The upper end inside the funnel (22) is circular and has the same cross-section as the oil leakage hole (201); The lower end inside the funnel (22) is oblong.

3. The modified asphalt preparation device with globally uniform constant-temperature heating according to claim 2, characterized in that: The length direction of the lower end inside the funnel (22) is the first direction; The radial direction of the annular plate (21) at the center point position of the lower end inside the funnel (22) is the second direction, and the first direction, the second direction and the axial direction of the annular plate (21) are perpendicular to each other in pairs.

4. A modified asphalt preparation device with globally uniform constant-temperature heating as described in claim 1, characterized in that: It further includes a protective cover (5). The protective cover (5) includes an outer cover (51), a first limiting plate (52), a second limiting plate (53) and a spring (54). Among them, the outer cover (51) is arranged outside the funnel (22) and abuts against the lower end of the funnel (22). A communication hole (501) is provided inside the outer cover (51); the first limiting plate (52) is fixedly arranged inside the outer cover (51) and is slidably connected with the funnel (22); the second limiting plate (53) is detachably fixed on the funnel (22) and is slidably arranged inside the outer cover (51); the spring (54) is abutted and arranged between the first limiting plate (52) and the second limiting plate (53).

5. The modified asphalt preparation device for globally uniformly and constantly heating according to claim 4, characterized in that: The funnel (22) includes a connecting end (221) and a water leakage end (222). Among them, one end of the connecting end (221) is fixedly arranged on the bottom side of the annular plate (21) and is communicated with the oil leakage hole (201). The connecting end (221) is of a cylindrical structure, and the connecting end (221) is slidably arranged inside the first limiting plate (52). The second limiting plate (53) is detachably fixed on the connecting end (221); one end of the water leakage end (222) is fixedly arranged at the end of the connecting end (221) away from the annular plate (21) and is communicated with it. The inner diameter of the water leakage end (222) gradually decreases from top to bottom, and the outer cover (51) abuts against the lower end of the water leakage end (222).

6. The modified asphalt preparation device with globally uniform constant temperature heating according to claim 4, characterized in that: The outer cover (51) includes a cover body (511) and a frustum (512). Among them, the cover body (511) abuts against the lower end of the funnel (22) and is connected with the first limiting plate (52) and the second limiting plate (53); The frustum (512) is fixedly arranged at the lower end outside the cover body (511), the outer diameter of the frustum (512) gradually increases from top to bottom, and the oil leakage hole (201) is formed in the cover body (511) and the frustum (512).

7. The modified asphalt preparation device with globally uniform constant-temperature heating according to claim 6, characterized in that: One end of the communication hole (501) close to the funnel (22) is located below the end far from the funnel (22).

8. The modified asphalt preparation device for globally uniformly and constantly heating according to claim 1, characterized in that: The stirrer (3) includes a turntable (31) and stirring blades (32), wherein, The turntable (31) is rotatably arranged in the heating barrel (1) and is located below the sample barrel (4), and an installation hole (301) is arranged in the turntable (31); The stirring blade (32) is fixedly arranged in the installation hole (301), and its fixed position is adjustable.

9. The modified asphalt preparation device with globally uniform constant-temperature heating according to claim 8, characterized in that: The stirring blade (32) includes a rotating shaft (321), a central plate (322) and a spiral plate (323), wherein, The rotating shaft (321) is fixedly arranged in the installation hole (301) in a rotatable manner; The central plate (322) is fixedly arranged on the rotating shaft (321); The spiral plates (323) are respectively fixedly arranged at both ends of the central plate (322), and the spiral plates (323) at both ends of the central plate (322) are centrosymmetric about the center point of the central plate (322).

10. The modified asphalt preparation device with globally uniform constant-temperature heating according to claim 1, characterized in that: It further includes three temperature detection devices (6), the temperature detection devices (6) are fixedly arranged on the ring plate (21), and the heights of the three temperature detection devices (6) are different.

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