Fly ash modified asphalt mixing equipment based on pavement

Abstract

The invention provides fly ash modified asphalt mixing equipment based on pavement, and relates to the technical field of asphalt mixing, and the fly ash modified asphalt mixing equipment comprises a U-shaped rotary bracket, a spherical mixing tank and a coaxial reversing mechanism. The spherical mixing tank rotates along the equatorial plane and rotates in the reverse direction of the stirrer to form a shear flow field, the throwing effect generated by 360-degree overturning of the U-shaped rotary support is overlaid, composite motion of materials in a three-dimensional space is achieved, the mixing uniformity is remarkably improved compared with traditional double-shaft stirring, and the mixing efficiency is improved. The resistance of reverse rotation of the stirrer and the spherical mixing tank is converted into the overall overturning motion of the spherical mixing tank and the U-shaped rotary support, when the resistance is increased, the spherical mixing tank automatically accelerates to overturn, hardened materials with large local resistance are dispersed through material throwing, and the stirring speed is increased; therefore, the phenomenon that the stirring shaft is broken or the motor is overloaded due to overlarge resistance is avoided, and meanwhile, the stirring efficiency is not reduced due to overload prevention.

Description

Technical Field

[0001] The present invention relates to the technical field of asphalt mixing, and particularly to a fly ash modified asphalt mixing device based on a paved road surface. Background Art

[0002] The construction and oxidation of road infrastructure are of great significance for maintaining ecological balance and improving the level of regional sustainable development. As an industrial waste, fly ash has great potential in secondary utilization. However, at present, the utilization rate of fly ash in asphalt concrete is less than 1%, resulting in a large amount of fly ash being stored, seriously harming the environment. Therefore, by deeply studying the key technologies for the application of high-volume fly ash in asphalt concrete, the effective utilization rate of fly ash resources can be further improved. By applying fly ash to asphalt concrete, not only can waste emissions be effectively reduced, but also the performance of road materials can be improved, the service life can be extended, and the recycling of solid waste resources can be realized. The mixing device is crucial in the preparation of fly ash modified asphalt.

[0003] Since the viscosity of fly ash modified asphalt varies greatly with temperature, once the temperature control fails, the viscosity of the asphalt will increase sharply, easily causing the motor of the stirring device to be overloaded and burned out. For traditional overload protection mixing devices, such as the mixer with the publication number CN103542010B, an overload protection mechanism is used to protect the motor and the reducer from overload. However, these overload protection methods are based on reducing the output power, which will reduce the mixing effect. Summary of the Invention

[0004] The purpose of the present invention is to provide a fly ash modified asphalt mixing device based on a paved road surface to solve the problem that the overload protection of the traditional mixing device in the above background reduces the mixing effect.

[0005] To solve the above technical problems, the technical solution adopted by the present invention is a fly ash modified asphalt mixing device based on a paved road surface, including: a mixing support, on which a U-shaped rotary support is rotatably connected, on which a spherical mixing tank is rotatably connected. One side of the mixing support is fixedly installed with a mixing motor through bolts. The output end of the mixing motor is connected to a transmission shaft through belt drive. The transmission shaft is rotatably connected to both the mixing support and the U-shaped rotary support. One end of the transmission shaft is fixedly connected with a driving gear through keyway fit. A large gear ring is fixedly connected to the spherical mixing tank through bolts. The large gear ring meshes with the driving gear, so as to drive the spherical mixing tank to rotate along the equatorial direction by using the mixing motor.

[0006] A stirrer is rotatably connected inside the spherical mixing tank. The stirrer includes a stirring shaft that penetrates the spherical mixing tank, and a coaxial reverse mechanism is fixedly connected to the bottom of the U-shaped rotary support. The input end of the coaxial reverse mechanism is fixedly connected to the spherical mixing tank, and the output end of the coaxial reverse mechanism is fixedly connected to the stirring shaft, so that when the spherical mixing tank rotates, it drives the stirrer to rotate in the opposite direction;

[0007] The mixing support provides support and a fixed foundation for the entire equipment to ensure the stability of the equipment; the U-shaped rotary support is rotatably connected to the mixing support, so that the spherical mixing tank can have a certain flipping space. The mixing motor serves as a power source, transmits power to the transmission shaft through belt drive, and then the driving gear on the transmission shaft meshes with the large gear ring to drive the spherical mixing tank to rotate along the equatorial direction, providing the rotational power of the tank body for the mixing of materials and promoting the preliminary mixing of materials in the tank.

[0008] Furthermore, a sealing cover is provided on the spherical mixing tank, and the sealing cover and the spherical mixing tank are sealed with a sealing ring. The setting of the sealing cover and the sealing ring ensures the sealing performance of the spherical mixing tank, prevents material leakage during the mixing process, and also avoids foreign impurities from entering the tank and affecting the mixing quality, providing a relatively closed and stable environment for the mixing of materials.

[0009] Furthermore, the output shaft of the mixing motor is fixedly connected with a small belt pulley through keyway fit, one end of the transmission shaft is fixedly connected with a large belt pulley through keyway fit, and the large belt pulley and the small belt pulley are connected by belt drive. The transmission ratio of the small belt pulley to the large belt pulley is 1:4. Through the belt drive system composed of the small belt pulley and the large belt pulley, the power transmission from the mixing motor to the transmission shaft is realized. The setting of the transmission ratio of 1:4 can adjust the speed of the mixing motor, convert the high-speed rotation of the motor into an appropriate speed of the transmission shaft to meet the speed requirements of the rotation of the spherical mixing tank. At the same time, belt drive has the functions of buffering, shock absorption, and overload protection.

[0010] Furthermore, the large gear ring is located on the equatorial plane of the spherical mixing tank, and the rotating shaft between the spherical mixing tank and the U-shaped rotary support is perpendicular to the equatorial plane of the spherical mixing tank. The large gear ring being located on the equatorial plane of the spherical mixing tank enables the meshing of the driving gear and the large gear ring to effectively drive the spherical mixing tank to rotate smoothly along the equatorial direction. The setting that the rotating shaft between the spherical mixing tank and the U-shaped rotary support is perpendicular to the equatorial plane provides a reasonable structural basis for the subsequent possible flipping movement of the spherical mixing tank, which helps to achieve multi-angle material mixing.

[0011] Furthermore, the transmission shaft is located at the center of gravity of the U-shaped rotary support and the spherical mixing tank, so that after the spherical mixing tank is filled with materials, its own center of gravity is closer to the transmission shaft, facilitating the smooth rolling of the U-shaped rotary support and the spherical mixing tank.

[0012] Furthermore, the transmission shaft coincides with the rotating shafts of the mixing support and the U-shaped rotating support. This ensures the stability and accuracy of power transmission. Such a setting prevents additional vibration and wear caused by non-coincidence of the shafts during transmission, ensuring that the driving gear can accurately drive the large gear ring, and thus enabling the spherical mixing tank to rotate stably.

[0013] Furthermore, a rotating sleeve is fixedly welded to the middle of the U-shaped rotating support. A connecting flange is fixedly connected to the bottom of the spherical mixing tank by bolts. A rotating rod is welded to the bottom of the connecting flange and passes through the rotating sleeve, and the rotating rod is rotatably connected to the rotating sleeve. The rotating sleeve provides rotational support for the rotating rod, enabling the spherical mixing tank to rotate stably on the U-shaped rotating support through the rotating rod. The connecting flange is used to firmly connect the spherical mixing tank and the rotating rod to ensure effective power transmission. This structural design ensures both the rotational flexibility of the spherical mixing tank and the stability of the structure.

[0014] Furthermore, the coaxial reverse mechanism includes a spherical gearbox. The spherical gearbox is fixedly connected to the bottom of the rotating sleeve by a flange. Inside the spherical gearbox, there are a first bevel gear, a second bevel gear, a third bevel gear, and a fourth bevel gear. The first bevel gear is located at the top of the spherical gearbox and is fixedly connected to the rotating rod through keyway fitting. The second bevel gear and the third bevel gear are respectively located on the left and right sides of the spherical gearbox and are both rotatably connected to the spherical gearbox. The first bevel gear forms a 90° orthogonal drive with the second bevel gear and the third bevel gear. The fourth bevel gear is located at the bottom of the spherical gearbox and also forms a 90° orthogonal drive with the second bevel gear and the third bevel gear. The core function of the coaxial reverse mechanism is to achieve the reverse rotation of the spherical mixing tank and the agitator. When the spherical mixing tank rotates, it drives the rotating rod to rotate, and then the first bevel gear rotates. Through the 90° orthogonal drive of the first bevel gear with the second bevel gear, the third bevel gear, and the fourth bevel gear, the rotation direction of the spherical mixing tank is changed and transmitted to the stirring shaft, causing the agitator to rotate in the opposite direction to the spherical mixing tank, enhancing the mixing effect of the materials.

[0015] Furthermore, the stirring shaft passes through the rotating rod and the first bevel gear and is fixedly connected to the fourth bevel gear. This ensures that the coaxial reverse mechanism can accurately transmit power to the agitator, enabling the agitator to rotate in the opposite direction as designed when the spherical mixing tank rotates, and stirring the materials inside the spherical mixing tank to further promote the uniform mixing of the materials.

[0016] Further, one side of the U-shaped rotary support is fixedly connected with an adjusting handwheel through bolts. The rotating shaft of the adjusting handwheel coincides with the rotating shaft of the U-shaped rotary support. The setting of the adjusting handwheel facilitates the operator to manually adjust the angle of the U-shaped rotary support for loading and unloading materials.

[0017] Compared with the prior art, the beneficial effects of the present invention include:

[0018] 1. The fly ash modified asphalt mixing equipment based on the paved road surface proposed by the present invention forms a shear flow field through the rotation of the spherical mixing tank along the equatorial plane and the reverse rotation of the stirrer, and superimposes the throwing effect generated by the 360° flipping of the U-shaped rotary support, realizing the composite movement of materials in three-dimensional space, and the mixing uniformity is significantly improved compared with the traditional double-shaft stirring.

[0019] 2. The fly ash modified asphalt mixing equipment based on the paved road surface proposed by the present invention converts the resistance of the reverse rotation of the stirrer and the spherical mixing tank into the flipping movement of the whole spherical mixing tank and the U-shaped rotary support. When the resistance increases, the spherical mixing tank automatically accelerates and flips, and uses the throwing of materials to disperse the agglomerated materials with larger local resistance, thus avoiding the fracture of the stirring shaft or the overload of the motor caused by excessive resistance, and at the same time, the stirring efficiency is not reduced due to preventing overload. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] The disclosure of the present invention will be described with reference to the accompanying drawings. It should be understood that the drawings are only for illustrative purposes and are not intended to limit the scope of protection of the present invention. In the drawings, the same reference numerals are used to refer to the same components. Among them:

[0021] Figure 1 Schematically shows a cross-sectional structure diagram of a fly ash modified asphalt mixing equipment based on a paved road surface proposed according to an embodiment of the present invention;

[0022] Figure 2 Schematically shows an external structure diagram of a fly ash modified asphalt mixing equipment based on a paved road surface proposed according to an embodiment of the present invention;

[0023] Figure 3 Schematically shows a mixing motor structure diagram of a fly ash modified asphalt mixing equipment based on a paved road surface proposed according to an embodiment of the present invention;

[0024] Figure 4 Schematically shows a connection flange structure diagram of a fly ash modified asphalt mixing equipment based on a paved road surface proposed according to an embodiment of the present invention;

[0025] Figure 5 Schematically shows the fly ash modified asphalt mixing equipment based on a paved road surface proposed according to an embodiment of the present invention Figure 1Schematic enlarged view of part A;

[0026] Figure 6 Schematically shows a structural schematic diagram of a spherical mixing tank of a fly ash modified asphalt mixing device based on a paved road according to an embodiment of the present invention;

[0027] Figure 7 Schematically shows a fly ash modified asphalt mixing device based on a paved road according to an embodiment of the present invention Figure 6 Schematic enlarged view of part B.

[0028] Reference numerals in the figure: 1, mixing support; 2, U-shaped rotary support; 201, rotating sleeve; 3, spherical mixing tank; 301, sealing cover; 4, mixing motor; 5, small pulley; 6, large pulley; 7, transmission shaft; 8, driving gear; 9, large gear ring; 10, connecting flange; 11, rotating rod; 12, stirrer; 13, stirring shaft; 14, coaxial reverse mechanism; 1401, spherical gearbox; 1402, first bevel gear; 1403, second bevel gear; 1404, third bevel gear; 1405, fourth bevel gear; 15, adjusting handwheel. Detailed implementation manners

[0029] It is easy to understand that according to the technical solution of the present invention, without changing the essence of the present invention, those of ordinary skill in the art can propose various interchangeable structural forms and implementation manners. Therefore, the following detailed implementation manners and the accompanying drawings are only exemplary descriptions of the technical solution of the present invention, and should not be regarded as the whole of the present invention or as a limitation or restriction on the technical solution of the present invention.

[0030] According to an embodiment of the present invention in combination with Figures 1-7 Shown. A fly ash modified asphalt mixing device based on a paved road includes: a mixing support 1, the mixing support 1 is welded by H350×350 steel, and two sets of tapered roller bearings of model 30212 are rotatably connected thereto with a U-shaped rotary support 2. Rotating pairs for cooperating with the mixing support 1 are provided on both side arms of the U-shaped rotary support 2, so that the U-shaped rotary support 2 can be flipped 360°. A rotating sleeve 201 is fixedly welded in the middle of the U-shaped rotary support 2, and a rotary pair is formed between the rotating sleeve 201 and a rotating rod 11 at the bottom of the spherical mixing tank 3. A connecting flange 10 is fixedly welded to the upper end of the rotating rod 11, and the connecting flange 10 is fixedly installed at the bottom of the spherical mixing tank 3 by bolts.

[0031] The spherical mixing tank 3 is fabricated by stamping and welding Q345B steel plates with a thickness of 12 mm, and the inner wall is sprayed with a Teflon coating to reduce material adhesion. The sealing cover 301 is connected to the spherical mixing tank 3 by 12 groups of M16 high-strength bolts. The bolts adopt a strength grade of 10.9, and a ternary ethylene propylene rubber sealing ring is used in the middle to achieve pressure sealing. The mixing motor 4 is selected from the YE3 series of variable-frequency motors and is fixed in the chassis on the left side of the mixing bracket 1 through the bottom flange and four groups of M12 bolts. The rated power of the motor is 37 kW, and the speed range is 0 - 1500 rpm. The output shaft of the motor is connected to the small pulley 5 through a keyway.

[0032] The small pulley 5 and the output shaft of the mixing motor 4 adopt a keyway fit. The key is a 12×8×45 flat key, and the belt is selected as an SPB type V-belt with a transmission ratio of 1:4. The large pulley 6 and the transmission shaft 7 adopt an interference fit plus double-key connection. Both ends of the transmission shaft 7 are supported on the mixing bracket 1 and the U-shaped rotary bracket 2 through tapered roller bearings. The driving gear 8 has a module of 6 and 24 teeth, which is matched with the module of the large gear ring 9, and the center distance is 120 mm, forming an external meshing transmission. The large gear ring 9 is fixed on the equatorial plane of the spherical mixing tank 3 through 24 M12 countersunk head bolts evenly distributed in the circumferential direction, and the bolts are treated with anti-loosening glue.

[0033] The rotating rod 11 is welded to the bottom flange of the spherical mixing tank 3 by groove welding, and the weld thickness is 10 mm. The rod body is subjected to quenching and tempering treatment with 40Cr, with a diameter of 80 mm. A labyrinth seal structure is provided at the bearing fit with the rotating sleeve 201, including two O-ring seals. The spherical gearbox 1401 of the coaxial reverse rotation mechanism 14 is fixed to the bottom flange of the rotating sleeve 201 through four groups of M10 bolts. Four groups of tapered roller bearings of model 30208 are arranged inside the spherical gearbox 1401 to support the bevel gear set. The first bevel gear 1402 and the rotating rod 11 are connected through a rectangular spline N16×13×3, with 16 teeth and a pressure angle of 20°, forming a 90° orthogonal transmission with the second bevel gear 1403 and the third bevel gear 1404. The second bevel gear 1403 and the third bevel gear 1404 both have 24 teeth and are symmetrically arranged on both sides of the first bevel gear 1402, with a center distance of 100 mm, jointly driving the fourth bevel gear 1405. The fourth bevel gear 1405 has 32 teeth and is connected to the stirring shaft 13 through a double key. The key is a 14×9×50 flat key, achieving a speed increase and reverse rotation with a ratio of 1:2.

[0034] The adjusting handwheel 15 is fixedly connected to the U-shaped rotary bracket 2 through bolts and is used to manually adjust the angle of the spherical mixing tank 3, thus facilitating loading and unloading.

[0035] When the device is working, the mixing motor 4 drives the spherical mixing tank 3 to rotate clockwise at 60 rpm. At the same time, the stirring shaft 13 realizes a counterclockwise rotation of 120 rpm through the coaxial reverse mechanism 14. The two sets of movements form a shear stress field inside the material. When encountering agglomerated materials that cause resistance, the stirring resistance is transmitted through the stirring shaft 13 to the fourth bevel gear 1405, and after the torque is amplified by the second bevel gear 1403 and the third bevel gear 1404, it is transmitted to the first bevel gear 1402, converted into the rotational resistance of the spherical mixing tank 3, and then transmitted to the large toothed ring 9 and the driving gear 8, forcing the U-shaped rotary support 2 and the spherical mixing tank 3 to rotate around the mixing support 1 together around the transmission shaft 7. The flipping angular velocity of the spherical mixing tank 3 is positively correlated with the stirring resistance and negatively correlated with the rotational speeds of the spherical mixing tank 3 and the stirrer 12. The flipping power of the spherical mixing tank 3 and the rotational stirring power sum of the spherical mixing tank 3 and the stirrer 12 is the output power of the mixing motor 4.

[0036] Working principle: When the above mixing device is working, first open the sealing cover 301, add raw materials such as fly ash, asphalt, and aggregates into the spherical mixing tank 3 in proportion, then close and lock the sealing cover 301, and then start the mixing motor 4. The mixing motor 4 drives the driving gear 8 to rotate through belt drive. Through the cooperation of the driving gear 8 and the large toothed ring 9, the spherical mixing tank 3 is driven to rotate around the rotating sleeve 201. At the same time, the rotating rod 11 rotates together with the spherical mixing tank 3, and then drives the first bevel gear 1402 to rotate. The first bevel gear 1402 drives the second bevel gear 1403 and the third bevel gear 1404 to rotate. The second bevel gear 1403 and the third bevel gear 1404 drive the fourth bevel gear 1405 to rotate in the opposite direction to the first bevel gear 1402. Thus, the fourth bevel gear 1405 can drive the stirring shaft 13 and the stirrer 12 to rotate in the opposite direction to the spherical mixing tank 3 to stir the material.

[0037] When the stirrer 12 rotates in the opposite direction to the spherical mixing tank 3, it will be subject to the resistance of the material. When the resistance is large, the spherical mixing tank 3 and the U-shaped rotary support 2 will undergo an overall flip to roll and stir the material, thus avoiding the motor overload caused by the excessive reverse rotation resistance of the stirrer 12 and the spherical mixing tank 3. Here, the flipping of the spherical mixing tank 3 and the reverse rotation of the stirrer 12 and the spherical mixing tank 3 are complementary. The thinner the material, the smaller the reverse rotation stirring resistance of the stirrer 12 and the spherical mixing tank 3, and the slower the flipping speed of the spherical mixing tank 3. Once the material viscosity is too high or there is local caking, the reverse rotation stirring resistance of the stirrer 12 and the spherical mixing tank 3 will be greater, and the flipping of the spherical mixing tank 3 will be faster. Thus, the flipping of the spherical mixing tank 3 can be used to make the material more uniform, relieve the stirring resistance of the stirrer 12, and avoid the overload of the motor at the same time. Compared with the traditional anti-overload measures, this solution can prevent overload without reducing the stirring effect on the material.

[0038] The technical scope of the present invention is not limited to the content described above. Those skilled in the art can make various deformations and modifications to the above embodiments without departing from the technical idea of the present invention, and these deformations and modifications shall fall within the protection scope of the present invention.

Claims

1. Fly ash modified asphalt mixing equipment based on paved roads, characterized in that, Comprising: A mixing support, on which a U-shaped rotary support is rotatably connected. A spherical mixing tank is rotatably connected to the U-shaped rotary support. On one side of the mixing support, a mixing motor is fixedly installed by bolts. The output end of the mixing motor is connected to a transmission shaft through belt pulley transmission. The transmission shaft is rotatably connected to the mixing support and at the same time is rotatably connected to the U-shaped rotary support. One end of the transmission shaft is fixedly connected with a driving gear through keyway fit. A large toothed ring is fixedly connected to the spherical mixing tank by bolts. The large toothed ring meshes with the driving gear, so as to drive the spherical mixing tank to rotate along the equatorial direction by using the mixing motor. A stirrer is rotatably connected inside the spherical mixing tank. The stirrer includes a stirring shaft, and the stirring shaft penetrates through the spherical mixing tank. And a coaxial reverse mechanism is fixedly connected to the bottom of the U-shaped rotary support. The input end of the coaxial reverse mechanism is fixedly connected to the spherical mixing tank, and the output end of the coaxial reverse mechanism is fixedly connected to the stirring shaft, so that when the spherical mixing tank rotates, it drives the stirrer to rotate in the reverse direction.

2. The fly ash modified asphalt mixing equipment based on the paved road surface according to claim 1, wherein, A sealing cover is arranged on the spherical mixing tank, and the sealing cover and the spherical mixing tank are sealed by a sealing ring.

3. The fly ash modified asphalt mixing equipment based on the paved road surface according to claim 1, wherein The output shaft of the mixing motor is fixedly connected with a small belt pulley through keyway fit. One end of the transmission shaft is fixedly connected with a large belt pulley through keyway fit. The large belt pulley and the small belt pulley are connected by a belt in transmission, and the transmission ratio of the small belt pulley to the large belt pulley is 1:

4.

4. The fly ash modified asphalt mixing equipment based on a paved road surface according to claim 1, wherein, The large toothed ring is located on the equatorial plane of the spherical mixing tank, and the rotating shaft between the spherical mixing tank and the U-shaped rotary support is perpendicular to the equatorial plane of the spherical mixing tank.

5. The fly ash modified asphalt mixing equipment based on a paved road surface according to claim 1, wherein, The transmission shaft is at the same height as the centers of gravity of the U-shaped rotary support and the spherical mixing tank.

6. The fly ash modified asphalt mixing equipment based on the paved road surface according to claim 1, characterized in that, The transmission shaft coincides with the rotating shafts of the mixing support and the U-shaped rotary support.

7. The fly ash modified asphalt mixing equipment based on the paved road surface according to claim 1, wherein A rotating sleeve is fixedly welded in the middle of the U-shaped rotary support. A connecting flange is fixedly connected to the bottom of the spherical mixing tank by bolts. A rotating rod is welded to the bottom of the connecting flange, and the rotating rod penetrates through the rotating sleeve, and the rotating rod is rotatably connected to the rotating sleeve.

8. The fly ash modified asphalt mixing equipment based on a paved road surface according to claim 7, characterized in that, The coaxial reverse mechanism includes a spherical gear box. The spherical gear box is fixedly connected to the bottom of the rotating sleeve by a flange. Inside the spherical gear box, there are a first bevel gear, a second bevel gear, a third bevel gear and a fourth bevel gear. The first bevel gear is located at the top of the spherical gear box, and the first bevel gear is fixedly connected with the rotating rod through keyway fit. The second bevel gear and the third bevel gear are respectively located on the left and right sides of the spherical gear box, and the second bevel gear and the third bevel gear are both rotatably connected to the spherical gear box. The first bevel gear forms a 90° orthogonal transmission with the second bevel gear and the third bevel gear. The fourth bevel gear is located at the bottom of the spherical gear box, and the fourth bevel gear also forms a 90° orthogonal transmission with the second bevel gear and the third bevel gear.

9. The fly ash modified asphalt mixing equipment based on the paved road surface according to claim 8, characterized in that, The stirring shaft penetrates through the rotating rod and the first bevel gear and is fixedly connected with the fourth bevel gear.

10. The fly ash modified asphalt mixing equipment based on a paved road surface according to claim 1, wherein, An adjusting handwheel is fixedly connected to one side of the U-shaped rotary support by bolts, and the rotating shaft of the adjusting handwheel coincides with the rotating shaft of the U-shaped rotary support.

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