Heating and stirring device for asphalt concrete stirring station

Abstract

The invention relates to the technical field of asphalt concrete mixing plants, in particular to a heating and mixing device for an asphalt concrete mixing plant, which comprises a mixing plant and a mixing drum rotationally connected to the mixing plant, the auxiliary heating mechanism is used for performing auxiliary heating on the materials; the mixing mechanism is used for mixing the asphalt and the aggregate; the knocking mechanism is used for knocking the mixing mechanism; the mixing mechanism is arranged in the mixing drum, the auxiliary heating mechanism is arranged on the mixing mechanism, and the knocking mechanism is arranged on the mixing drum. When the arranged guide plates rotate, the ends, close to each other, of the two guide plates in each group compress and gather materials, and a local high-pressure area is formed. After the material is guided to the other end along the inclined surface, the pressure is suddenly reduced, so that the material can be periodically compressed and released, and a strong disturbance area and a vortex are formed at the ends, far away from each other, of the guide plates. Therefore, the mixing effect of the materials is greatly enhanced, the asphalt can be quickly and uniformly coated on the surface of the aggregate, and the stirring efficiency of the asphalt concrete is improved.

Description

Technical Field

[0001] This invention relates to the field of asphalt concrete mixing plant technology, specifically to a heating and mixing device for asphalt concrete mixing plants. Background Technology

[0002] Asphalt concrete is a core material in modern road engineering, and its quality directly affects the durability, smoothness, and driving safety of the road surface. The production process of asphalt mixtures is mainly completed in asphalt concrete mixing plants, where the mixing unit is the key equipment to ensure that asphalt and aggregates of different particle sizes are mixed uniformly to form an ideal coating structure. Its performance directly determines the homogeneity, temperature stability, and final road performance of the mixture.

[0003] Currently, the core mixing mechanism of widely used asphalt mixing plants, whether forced or drum type, relies on the shearing action and macroscopic convection generated by rotating blades or mixing arms on the material. At high speeds, the blades propel the material in a continuous circulation, achieving shear dispersion through velocity gradients between material layers. However, asphalt, a typical high-viscosity non-Newtonian fluid, exhibits extremely high viscosity, especially within its operating temperature range, resulting in a low Reynolds number and a consistently stable laminar flow. Under this flow field, material mixing primarily relies on slow molecular diffusion and limited laminar shear, making it difficult to spontaneously generate efficient turbulent disturbances. Therefore, we propose a heated mixing device for asphalt concrete mixing plants. Summary of the Invention

[0004] The purpose of this invention is to provide a heating and mixing device for an asphalt concrete mixing plant, which solves the problems mentioned in the background art.

[0005] To achieve the above objectives, the present invention provides the following technical solution: A heating and mixing device for an asphalt concrete mixing plant includes a mixing plant and a mixing drum rotatably connected to the mixing plant. Auxiliary heating mechanism, used for auxiliary heating of materials; A mixing plant is used to mix asphalt with aggregates; A striking mechanism is used to strike the mixing mechanism; The mixing mechanism is located inside the mixing drum, the auxiliary heating mechanism is located on the mixing mechanism, and the tapping mechanism is located on the mixing drum.

[0006] Preferably, the mixing mechanism includes a guide plate, which is fixedly connected to the inside of the mixing drum. The guide plate is provided in several groups, and the several groups of guide plates are spirally distributed inside the mixing drum.

[0007] Preferably, each group of the guide vanes has two, both of which are arc-shaped structures, and one end of each guide vane is positioned close to the other, with an included angle of 30°-80° between them.

[0008] Preferably, the auxiliary heating mechanism includes a heat preservation cylinder, which is sleeved on the outside of the mixing drum and fixedly connected to the mixing station. A fan is fixedly connected to the mixing station, and the output end of the fan is connected to the heat preservation cylinder through an air inlet pipe.

[0009] Preferably, the guide plate has a turbulence groove, a support rod is rotatably connected inside the turbulence groove, and the turbulence plate is fixedly connected to the support rod.

[0010] Preferably, the spoiler has a triangular prism structure, and a "V" shaped groove is provided on one side of the spoiler. The support rod passes through the guide plate, and a sealing sleeve is fitted on the support rod. The sealing sleeve is fixedly connected to the inside of the guide plate, and a positioning block is fixedly connected to the end of the support rod.

[0011] Preferably, the striking mechanism includes a piston cylinder, which is fixedly connected inside the guide plate, and a piston rod is slidably connected inside the piston cylinder, the piston rod passing through the stirring cylinder.

[0012] Preferably, a magnetic block is fixedly connected to the end of the piston rod, and a drive bar is fixedly connected to the inner wall of the insulation cylinder. The drive bar has an arc-shaped structure and is made of magnetic metal.

[0013] Preferably, there are four spoilers, and the four spoilers are arranged in a circumferential array on the support rod. The four spoilers are arranged in the same direction or alternately in opposite directions in the circumferential direction.

[0014] By means of the above technical solution, the present invention provides a heating and mixing device for asphalt concrete mixing plants that has at least the following beneficial effects: (1) In this invention, the guide plates, when rotating, compress and converge the material at the end where the two guide plates in each group are close to each other, forming a local high-pressure zone. After the material flows along the inclined plane to the other end, the pressure drops sharply, thus allowing for periodic compression and release of the material. A strong disturbance zone and vortex are formed at the end where the guide plates are far apart. This greatly enhances the mixing effect of the material, allowing asphalt to coat the aggregate surface more quickly and evenly, and improving the mixing efficiency of asphalt concrete.

[0015] (2) This invention uses guide vanes to forcefully alter the flow field through a figure-eight geometry, breaking the monotonous shear flow in high-viscosity fluids and introducing unstable vortices, thus greatly improving the effect of distributed mixing. The strong compression at the tip and the high shear of the inclined surface help break up asphalt agglomerates and improve the uniformity of the coated aggregates. A predictable and enhanced local flow field is formed, which outperforms simply increasing the number of blades or the rotational speed. Attached Figure Description

[0016] The accompanying drawings, which are provided to further illustrate the invention, constitute a part of this application: Figure 1 This is a schematic diagram of the structure of the present invention; Figure 2 This is a schematic diagram of the insulation cylinder structure of the present invention; Figure 3 This is a schematic diagram of the internal structure of the heat insulation cylinder of the present invention; Figure 4 This is a schematic diagram of the internal structure of the stirring tank of the present invention; Figure 5 This is a schematic diagram of the mixing mechanism of the present invention. Figure 1 ; Figure 6 This is a schematic diagram of the mixing mechanism of the present invention. Figure 2 ; Figure 7 This is a schematic diagram of the internal structure of the mixing mechanism of the present invention.

[0017] In the diagram: 1. Mixing station; 2. Mixing drum; 3. Mixing mechanism; 31. Guide plate; 32. Baffle channel; 33. Support rod; 34. Baffle plate; 35. Sealing sleeve; 36. Positioning block; 4. Auxiliary heating mechanism; 41. Insulation cylinder; 42. Fan; 43. Air inlet pipe; 5. Striking mechanism; 51. Piston cylinder; 52. Piston rod; 53. Magnetic block; 54. Drive bar. Detailed Implementation

[0018] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0019] A heating and mixing device for an asphalt concrete mixing plant, such as Figures 1-7As shown, it includes a mixing plant 1 and a mixing drum 2 rotatably connected to the mixing plant 1; a mixing mechanism 3 is set inside the mixing drum 2 for mixing asphalt and aggregate; an auxiliary heating mechanism 4 is provided on the mixing mechanism 3 for auxiliary heating of the material; a striking mechanism 5 is provided on the mixing drum 2 for reducing the adhesion between asphalt and the mixing mechanism 3.

[0020] Specifically, the mixing mechanism 3 includes guide plates 31, which are fixedly connected to the inner side of the mixing drum 2. Several groups of guide plates 31 are provided, with two guide plates in each group. Both guide plates 31 are arc-shaped, guiding the flow of asphalt. The two guide plates 31 are positioned close to each other at one end, with an included angle of 30°-80°. The two guide plates 31 are combined to form a figure-eight structure, with one end close to each other and the other end far apart. The ends of the guide plates 31 that are close to each other rotate in the same direction as the mixing drum, while the ends that are far apart face the opposite direction. Simultaneously, the guide plates 31, fixed to the inner wall of the mixing drum 2, rotate synchronously with the drum 2. When the guide plates 31 rotate forward, the ends that are close to each other wedge into the material. Due to the inclined surfaces on both sides, most of the material is squeezed out by the inclined surfaces on the far sides of the two guide plates 31, forming a vertical flow. The material is compressed and converged by the guide plates 31, forming a local high-pressure zone. A small portion is subjected to intense shearing through the narrow gap between the two guide plates 31. The material squeezed out by the inclined surfaces of the guide plates 31 accelerates along the inclined surfaces of the guide plates 31 in a direction away from the other guide plate 31. Because the inclined surfaces form a certain angle with the direction of rotation, the material acquires radial and tangential velocity components. The high-viscosity asphalt adhering closely to the surfaces of the guide plates 31 forms a high-shear layer, which is beneficial for the stretching and dispersion of the asphalt film. However, due to the extremely high viscosity, laminar flow remains dominant. At the same time, the inclination of the surfaces causes the flaky aggregates to oriented. Material flowing out from the narrow area between the guide plates 31 enters the suddenly expanding space, where its velocity decreases. According to Bernoulli's principle, a low-pressure wake zone forms behind the ends of the two guide plates 31 that are far apart. Material flowing out from both sides meets, collides, and is entrained in this low-pressure wake zone, easily forming a pair of counter-rotating vortices. This generates transient turbulence or strong disturbance. Simultaneously, this vortex zone strongly entrains material from other areas inside the mixing drum 2, achieving mixing between different batches of material. Several sets of guide plates 31 are spirally distributed inside the mixing drum 2, evenly distributed at different heights, thus enabling effective mixing of asphalt at different heights.

[0021] In addition, the auxiliary heating mechanism 4 includes a heat preservation cylinder 41, which is sleeved on the outside of the mixing drum 2 and fixedly connected to the mixing station 1. The heat preservation cylinder 41 is used to insulate and support the mixing drum 2, improving its stability. There is a gap between the heat preservation cylinder 41 and the mixing drum 2, which allows for temporary storage of the exhaust gas introduced into the heat preservation cylinder 41, increasing the heat exchange time between the exhaust gas and the material inside the mixing drum 2. A fan 42 is fixedly connected to the mixing station 1. The output end of the fan 42 is connected to the heat preservation cylinder 41 through an air inlet pipe 43. The fan 42 is connected to the exhaust gas recovery inlet pipe 43. The fan 42 can introduce exhaust gas with residual heat into the heat preservation cylinder 41, thereby reducing the heating time of the material inside the mixing drum 2. At the same time, the end of the heat preservation cylinder 41 away from the air inlet pipe 43 is connected to an exhaust pipe for the recovery and treatment of the exhaust gas after waste heat recovery.

[0022] Furthermore, the surface of the guide plate 31 is provided with a turbulence groove 32, and a support rod 33 is rotatably connected inside the turbulence groove 32. This turbulence groove 32 increases the heat exchange area between the surface and interior of the guide plate 31, improving the utilization efficiency of the exhaust gas. Four turbulence plates 34 are fixedly connected to the support rod 33, arranged in a circumferential array on the support rod 33. The turbulence plates 34 can agitate the material flowing through the guide plate 31, causing irregular flow as the material passes near the support rod 33, thus improving the mixing and stirring effect of the material.

[0023] Based on this, the spoiler 34 has a triangular prism structure, and a "V"-shaped groove is opened on one side of the spoiler 34. The support rod 33 is set through the guide plate 31, and a sealing sleeve 35 is fitted on the support rod 33. The sealing sleeve 35 is fixedly connected to the inside of the guide plate 31. The V-shaped groove allows the end of the spoiler 34 to form a concave structure. Under the impact of the material flow, the spoiler 34, together with the support rod 33, can rotate under the impact of the material flow, thereby continuously agitating the material. The four spoilers 34 can be arranged in the same direction or alternately in opposite directions. When the spoilers 34 are arranged in the same direction, such as... Figure 5 As shown, the V-shaped end of the baffle 34 on one side of the support rod 33 is always in the same direction as the material flow, thus continuously receiving the thrust of the material flow. The end of the baffle 34 on the other side of the support rod 33, away from the V-shape, is in the same direction as the material flow, thus receiving less driving force from the material. This allows the support rod 33 to maintain continuous rotation, while the baffle 34 can continuously cut through at the smaller angle. The material flows past both sides of the baffle 34 in the same way and converges at the tail of the baffle 34, forming different flow states. When the baffles 34 are alternately arranged in opposite directions, such as... Figure 6As shown, the baffles 34 on both sides of the support rod 33 rotate alternately to the V-shaped end, aligning with the material flow direction. This allows the support rod 33 to rotate 1 / 4 turn in the forward direction and 1 / 4 turn in the reverse direction alternately, thus alternatingly disturbing the material flowing on both sides. The sealing sleeve 35 seals the interior of the guide plate 31, preventing exhaust gas from seeping into the material. A positioning block 36 is fixedly connected to the end of the support rod 33, which secures the support rod 33 to the guide plate 31. Simultaneously, because the flow field inside the material remains unstable and irregular under the vortex guided by the guide plate 31, when the tails of the two baffles 34 in opposite directions simultaneously face the stirring direction, the unstable flow field results in different thrusts on the two baffles 34, causing them to continue rotating and disturbing the material.

[0024] In addition, the striking mechanism 5 includes a piston cylinder 51, which is fixedly connected inside the guide plate 31. A piston rod 52 is slidably connected inside the piston cylinder 51. The piston rod 52 passes through the stirring cylinder 2. The piston cylinder 51 and the piston rod 52 can cooperate with each other to form an air hammer structure, which continuously strikes the stirring cylinder 2, thereby reducing the adhesion of materials to the surface of the guide plate 31 or the stirring cylinder 2.

[0025] Based on this, a magnetic block 53 is fixedly connected to the end of the piston rod 52, and a drive bar 54 is fixedly connected to the inner wall of the insulation cylinder 41. The drive bar 54 has an arc-shaped structure and is made of magnetic metal. The magnetic block 53 at the end of the piston rod 52 can cooperate with the drive bar 54 to drive the piston rod 52, causing the end of the piston rod 52 to move along the surface of the arc-shaped drive bar 54 and move out of the piston cylinder 51. After moving to the end of the drive bar 54, it is quickly released. Since the inside of the piston cylinder 51 is sealed, a low-pressure environment is formed inside the piston cylinder 51 after the piston rod 52 moves outward. Meanwhile, exhaust gas is continuously introduced between the stirring cylinder 2 and the insulation cylinder 41, maintaining a normal or high-pressure state. Therefore, under the action of the pressure difference, the piston rod 52 quickly returns to the inside of the piston cylinder 51, achieving a striking effect. A guide wheel is rotatably connected to the piston rod 52 to facilitate the movement of the end of the piston rod 52 on the drive bar 54.

[0026] In the operation of the heating and mixing device for an asphalt concrete mixing plant according to the present invention, the mixing drum 2 rotates continuously under the drive of the driving equipment, continuously mixing the asphalt and aggregate inside the mixing drum 2. As the mixing drum 2 rotates, the guide plate 31 continuously guides the asphalt, causing most of the asphalt material to flow along the side of the guide plate 31 that is far apart from the material. The arc-shaped guide plate 31 causes the material to form a vertical flow trajectory, thereby compressing the material. When the material flows to the end of the guide plate 31, it suddenly loses the restraint of the guide plate 31, and the compressed material converges into a vortex in the cavity formed by the far-away end of the guide plate 31. This results in intense local mixing of the material and guides nearby material to the vortex, improving the mixing effect. During the rotation of the guide plate 31, the baffle plate 34 on the guide plate 31 rotates continuously around the support rod 33 under the impact of the material flow, and the tip of the baffle plate 34 further agitates the material, thereby further improving the mixing effect. The blower 42 continuously introduces exhaust gas into the insulation cylinder 41, which, in conjunction with the heating equipment, heats the material inside the mixing drum 2. The guide plate 31 is connected to the insulation cylinder 41, allowing the exhaust gas entering the insulation cylinder 41 to directly exchange heat with the material through the guide plate 31, thus mitigating the temperature drop caused by the sudden decompression of the material during mixing. As the mixing drum 2 rotates, the piston cylinder 51 rotates synchronously with it. When the piston rod 52 rotates to the position where the drive bar 54 is closest to the mixing drum 2, the magnetic block 53 is attracted by the drive bar 54 due to its magnetism and moves along the drive bar 54 during rotation. As the drive bar 54 gradually moves away from the mixing drum 2, the piston rod 52, driven by the magnetic block 53, gradually moves out of the piston cylinder 51. After separating from the drive bar 54, the low pressure inside the piston cylinder 51 quickly resets it, forming a hammer-like structure that strikes the guide plate 31 to reduce material adhesion.

[0027] It should be noted that, in this document, relational terms such as "first" and "second" are used only to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such process, method, article, or apparatus.

[0028] Although embodiments of the invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A heating and mixing device for an asphalt concrete mixing plant, characterized in that: It includes a mixing plant (1) and a mixing drum (2) rotatably connected to the mixing plant (1); The mixing unit (3) is used to mix asphalt with aggregates; Auxiliary heating mechanism (4) is used to assist in heating the material; A striking mechanism (5) is used to strike the mixing mechanism (3); The mixing mechanism (3) is located inside the mixing drum (2), the auxiliary heating mechanism (4) is located on the mixing mechanism (3), and the striking mechanism (5) is located on the mixing drum (2).

2. The heating and mixing device for an asphalt concrete mixing plant according to claim 1, characterized in that: The mixing mechanism (3) includes a guide plate (31), which is fixedly connected to the inside of the mixing drum (2). The guide plate (31) is provided in several groups, and the several groups of guide plates (31) are spirally distributed inside the mixing drum (2).

3. The heating and mixing device for an asphalt concrete mixing plant according to claim 2, characterized in that: Each group of the guide plates (31) is provided with two, both of which are arc-shaped structures, and one end of each guide plate (31) is close to the other, with the included angle between the two guide plates (31) being 30°-80°.

4. The heating and mixing device for an asphalt concrete mixing plant according to claim 1, characterized in that: The auxiliary heating mechanism (4) includes a heat preservation cylinder (41), which is sleeved on the outside of the mixing cylinder (2). The heat preservation cylinder (41) is fixedly connected to the mixing station (1). A fan (42) is fixedly connected to the mixing station (1). The output end of the fan (42) is connected to the heat preservation cylinder (41) through the air inlet pipe (43).

5. A heating and mixing device for an asphalt concrete mixing plant according to claim 2, characterized in that: The guide plate (31) is provided with a turbulence groove (32), and a support rod (33) is rotatably connected inside the turbulence groove (32). A turbulence plate (34) is fixedly connected to the support rod (33).

6. The heating and mixing device for an asphalt concrete mixing plant according to claim 5, characterized in that: The spoiler (34) is a triangular prism structure, and a "V" shaped groove is provided on one side of the spoiler (34). The support rod (33) is installed through the guide plate (31). A sealing sleeve (35) is fitted on the support rod (33). The sealing sleeve (35) is fixedly connected inside the guide plate (31). A positioning block (36) is fixedly connected to the end of the support rod (33).

7. The heating and mixing device for an asphalt concrete mixing plant according to claim 1, characterized in that: The striking mechanism (5) includes a piston cylinder (51), which is fixedly connected inside the guide plate (31). A piston rod (52) is slidably connected inside the piston cylinder (51), and the piston rod (52) passes through the stirring cylinder (2).

8. A heating and mixing device for an asphalt concrete mixing plant according to claim 7, characterized in that: A magnetic block (53) is fixedly connected to the end of the piston rod (52), and a drive bar (54) is fixedly connected to the inner wall of the heat preservation cylinder (41). The drive bar (54) has an arc-shaped structure and is made of magnetic metal.

9. A heating and mixing device for an asphalt concrete mixing plant according to claim 6, characterized in that: The spoiler (34) is provided in four parts, and the four spoilers (34) are arranged in a circular array on the support rod (33). The four spoilers (34) are arranged in the same direction or alternately arranged in opposite directions in the circumferential direction.

Images