An asphalt mixture drying device

Abstract

The present application provides a kind of asphalt mixture drying device, it is related to asphalt recycling equipment technical field, including rotary drum and rotary drum driving assembly, rotary drum one end is rotationally equipped with distribution cylinder, the rotation of distribution cylinder is driven by distribution cylinder driving assembly;Distribution cylinder is rotationally equipped with distribution frame in, distribution frame is driven by driving element, multiple sieve plates are installed on distribution frame, gap is left between sieve plate and the inner wall of distribution cylinder;Multiple sieve plates are equipped with spiral blade, spiral blade is connected with distribution frame, the lower portion of spiral blade is equipped with blanking plate, the lower portion of distribution cylinder is equipped with burner one.The present application separates coarse material and fine material in asphalt mixture using distribution cylinder, burner one preheats material in distribution cylinder, can transfer more heat to coarse material, coarse material and fine material enter rotary drum and dry the same time, it is favorable to the drying effect of coarse material and fine material consistent, thereby it is favorable to reduce the situation of fine material excessive drying.

Description

Technical Field

[0001] This invention relates to the field of asphalt recycling equipment technology, and specifically to an asphalt mixture drying device. Background Technology

[0002] Asphalt is a commonly used material in road construction, used for paving highways, urban roads, and airport runways. Recycled asphalt mixtures are circular building materials formed through the crushing, screening, and recycling of waste asphalt pavement. Their main components include aged asphalt, aggregates, and additives. In the asphalt pavement recycling process, the recycled asphalt mixture is typically dried to remove moisture. Residual moisture hinders the bonding between new asphalt and old aggregates, leading to interfacial delamination and increased porosity, thereby reducing the pavement's resistance to water damage and its durability.

[0003] For example, patent document CN118600800B discloses a drying and mixing device for recycled asphalt mixtures. This device features an inner cylinder within an outer cylinder, with an arc-shaped rack at the bottom. Multiple boxes are mounted on the inner side of the outer cylinder, each equipped with a lifting plate assembly. When the outer cylinder rotates, bringing the boxes closer to the bottom, a first drive gear and the arc-shaped rack activate the drive shaft, storing energy and driving the lifting plates towards the bottom of the boxes. This creates space to catch and store the asphalt mixture falling from above. As the outer cylinder continues to rotate until the first drive gear on the box leaves the arc-shaped rack, the energy release assembly releases energy, causing the lifting plates to spring up and disperse the stored mixture inside the boxes. This method can improve the drying effect of the asphalt mixture to some extent.

[0004] However, because the asphalt mixture contains asphalt particles of different sizes, these particles, even after being mixed in a specific ratio and entering the drying equipment, still exhibit differences in size. Asphalt particles of varying sizes enter the drying equipment together and are dried along a common path. Within the same drying time, smaller asphalt particles dry before larger ones. When the larger particles dry, the smaller particles become over-dried, which can lead to the aging of the asphalt components. Therefore, it is necessary to develop an asphalt mixture drying device to solve the technical problem of uneven drying of asphalt particles of different sizes. Summary of the Invention

[0005] In view of this, the present invention provides an asphalt mixture drying device to solve the technical problem of uneven drying of asphalt particles of different sizes during the drying of asphalt mixtures in the prior art.

[0006] To solve the above-mentioned technical problems, the present invention provides an asphalt mixture drying device, including a rotating drum and a rotating drum driving assembly for driving the rotating drum to rotate. A material distribution cylinder is rotatably provided at one end of the rotating drum, and the rotation of the material distribution cylinder is driven by the material distribution cylinder driving assembly.

[0007] A material distribution frame is rotatably installed inside the material distribution cylinder. The material distribution frame is driven by a drive component. Multiple screen plates are installed on the material distribution frame near the inner wall of the material distribution cylinder. The multiple screen plates form a cylindrical structure, and a gap is left between the screen plates and the inner wall of the material distribution cylinder.

[0008] A spiral blade is provided between multiple screen plates. The spiral blade is connected to the material distribution frame. A material drop plate is provided below the spiral blade. The material distribution cylinder and the rotating cylinder are connected. A burner that can heat the material distribution cylinder is provided below the material distribution cylinder. The axis of the material distribution cylinder gradually slopes downward from the end away from the rotating cylinder to the end closer to the rotating cylinder. The rotation directions of the material distribution cylinder and the material distribution frame are opposite.

[0009] By adopting the above technical solution, the burner heats a pair of distribution cylinders, thereby preheating the material inside the distribution cylinders. The distribution cylinder drive assembly drives the distribution cylinders to rotate, which is beneficial for uniform heating of the distribution cylinders. The drive component drives the distribution frame to rotate, feeding the asphalt mixture to be dried into the distribution cylinders first. Smaller particles of fine material pass through the screen plate and enter the discharge plate. The spiral blades follow the rotation of the distribution frame, quickly conveying the fine material into the rotating drum for drying. Larger particles of coarse material fall onto the screen plate. As the distribution frame drives the screen plate to rotate, the coarse material falls from the gap between the distribution cylinder and the screen plate to the bottom of the distribution cylinder. With the rotation of the distribution cylinder, the coarse material is gradually conveyed into the rotating drum for drying. Because fine materials can enter the rotating drum for drying more quickly under the conveying of the spiral blades, while coarse materials need to fall to the bottom of the distribution drum with the rotation of the screen plate before entering the rotating drum. In addition, coarse materials are closer to the drum wall than fine materials, so the heat on the drum wall is transferred to the coarse materials first. Thus, the distribution drum can transfer more heat to the coarse materials than to the fine materials. After coarse and fine materials enter the rotating drum and are dried for the same amount of time, it is beneficial to ensure that the drying effect of coarse and fine materials is consistent, thereby helping to reduce the over-drying of fine materials.

[0010] Preferably, both ends of the distribution cylinder are rotatably connected to a front baffle and a rear baffle. Both the front baffle and the rear baffle are provided with multiple corrugated grooves connected in sequence. The distribution frame is provided with a sliding groove, and a crushing frame is slidably installed in the sliding groove. Both ends of the crushing frame can slide in the corrugated grooves of the front baffle and the rear baffle, respectively. The crushing frame is located between the distribution cylinder and the screen plate, and multiple crushing rods are installed on the crushing frame.

[0011] By adopting the above technical solution, the drive component drives the material distribution frame to rotate, and the material distribution frame drives the crushing frame to rotate. At the same time, the crushing frame slides in the corrugated groove, causing the crushing frame to drive the crushing rod to reciprocate between the material distribution cylinder and the screen plate. The crushing rod can crush the coarse material on the screen plate, which helps to reduce the phenomenon that existing asphalt mixture recycled material is prone to clumping due to its own weight during storage. This, in turn, helps to evenly heat the internal moisture and asphalt of the clumps, thus improving the drying effect.

[0012] Preferably, the rear baffle is located between the distributing cylinder and the rotating cylinder, and the rear baffle and the rotating cylinder are rotatably connected. The discharge plate is installed between the front baffle and the rear baffle. The discharge plate has a discharge port at one end near the rear baffle, and the lower part of the rear baffle has a feed port.

[0013] By adopting the above technical solution, after fine materials fall onto the discharge plate, they are conveyed by the stirring blades and fall from the discharge port to the bottom of the distribution cylinder, near the rotating drum. Then, through the rotation of the distribution cylinder, they enter the rotating drum through the feed inlet for drying. After coarse materials fall to the bottom of the distribution cylinder, they gradually move towards the feed inlet as the distribution cylinder rotates, and then enter the rotating drum through the feed inlet for drying.

[0014] Preferably, the material distribution rack is equipped with a scraper that can abut against the inner wall of the material distribution cylinder.

[0015] By adopting the above technical solution, since the material distribution frame and the material distribution cylinder rotate in opposite directions, the material distribution frame drives the scraper to rotate synchronously during the rotation process. The scraper scrapes the material adhering to the inner wall of the material distribution cylinder, which reduces the workload of cleaning the material distribution cylinder and helps to reduce the impact of the material adhering to the inner wall of the material distribution cylinder on heat exchange.

[0016] Preferably, both ends of the crusher are equipped with slide bars that can pass through the slide groove and extend into the corrugated groove.

[0017] By adopting the above technical solution, the slide rod passes through the slide groove and can slide inside the slide groove. The material distribution frame drives the slide groove to rotate, which in turn drives the slide rod and the crushing frame to rotate. The slide rod extends into the corrugated groove and slides along the corrugated groove while rotating, so that the slide rod and the crushing frame can reciprocate between the screen plate and the inner wall of the material distribution cylinder to achieve the crushing of coarse materials.

[0018] Preferably, a feeding cylinder is rotatably connected to the end of the distributing cylinder away from the rotating cylinder. The upper part of the feeding cylinder is provided with a material inlet. A front baffle is installed inside the feeding cylinder. The end of the distributing frame is rotatably connected to the end of the feeding cylinder away from the distributing cylinder.

[0019] By adopting the above technical solution, the material enters the feeding cylinder from the material inlet. The screen plate is located below the material inlet. The coarse material falls onto the screen plate on the distribution frame and moves with the screen plate to the bottom of the distribution cylinder. The fine material falls onto the drop plate through the screen plate, realizing the separation of coarse and fine materials and extending the movement path of the coarse material in the distribution cylinder.

[0020] Preferably, a second burner capable of heating the rotating drum is provided at the end of the rotating drum away from the distribution drum, a material outlet is provided below the second burner on the rotating drum, and an air outlet is provided at the end of the feed drum away from the distribution drum.

[0021] By adopting the above technical solution, the heat generated by the second burner is transferred to the rotating drum and dried the material inside the drum. The hot gas is discharged from the gas outlet, and the dried material is discharged from the material outlet.

[0022] Preferably, multiple lifting plates are installed at intervals on the inner wall of the rotating drum.

[0023] By adopting the above technical solution, the material inside the drum can be lifted up by the lifting plate while the drum rotates, which helps to improve the uniformity of material drying.

[0024] Preferably, the dispensing cylinder drive assembly includes a dispensing cylinder gear ring mounted on the outside of the dispensing cylinder and a dispensing cylinder motor for driving the dispensing cylinder gear ring to rotate.

[0025] By adopting the above technical solution, the motor of the distributing cylinder drives the gear ring of the distributing cylinder to rotate, which in turn drives the distributing cylinder to rotate. This is beneficial for the material at the bottom of the distributing cylinder to enter the rotating cylinder through the material inlet for drying, and at the same time, it is beneficial for the burner to make the cylinder wall of the distributing cylinder uniformly heated.

[0026] Preferably, the driving component includes a material distribution rack gear ring mounted at the end of the material distribution rack and a material distribution rack motor for driving the material distribution rack gear ring to rotate.

[0027] By adopting the above technical solution, the motor of the material distribution frame drives the gear ring of the material distribution frame to rotate, which in turn drives the material distribution frame to rotate. This is beneficial for the coarse material on the screen plate to fall onto the inner wall of the material distribution cylinder. At the same time, it is beneficial for the crushing rod on the crushing frame to rotate along the corrugated groove and crush the coarse material.

[0028] The beneficial effects of the above-described technical solution of the present invention are as follows:

[0029] 1. This invention utilizes a separating cylinder to separate coarse and fine materials in asphalt mixtures. The burner heats the cylinder wall, transferring heat to the material inside and preheating it. The coarse material has a longer movement path than the fine material within the separating cylinder, and it is also closer to the cylinder wall. This allows the heat from the cylinder wall to be transferred to the coarse material first, resulting in the separating cylinder transferring more heat to the coarse material. Since both coarse and fine materials are dried for the same amount of time in the rotating drum, the drying effect is more consistent, thus reducing the risk of over-drying of the fine material.

[0030] 2. The crushing frame of the present invention can crush coarse materials, which helps to reduce the phenomenon that existing asphalt mixture recycled materials are prone to clumping due to their own weight during storage. This, in turn, helps to evenly heat the internal moisture and asphalt of the clumps, thus improving the drying effect.

[0031] 3. The scraper of the present invention can scrape off the material adhering to the inner wall of the dispensing cylinder, which reduces the workload of cleaning the dispensing cylinder and helps to reduce the impact of the material adhering to the inner wall of the dispensing cylinder on heat exchange. Attached Figure Description

[0032] Figure 1 This is a schematic diagram of the asphalt mixture drying device of the present invention;

[0033] Figure 2 This is a cross-sectional view of the asphalt mixture drying device of the present invention located at the rotating drum;

[0034] Figure 3 This is a cross-sectional view of the dispensing cylinder of the present invention;

[0035] Figure 4 This is a cross-sectional view of the dispensing cylinder and the feeding cylinder of the present invention;

[0036] Figure 5 for Figure 4 Enlarged view of point A in the middle;

[0037] Figure 6 This is a partial structural diagram of the material distribution rack and crushing rack of the present invention;

[0038] Figure 7 This is a side view of the rear baffle of the present invention;

[0039] Figure 8 for Figure 6 Enlarged view of point B in the middle.

[0040] In the diagram: 1. Feed cylinder; 11. Material inlet; 12. Air outlet; 2. Distributor cylinder; 21. Burner 1; 211. Combustion hood; 22. Distributor frame; 221. Screen plate; 222. Mounting frame; 223. Slide groove; 224. Scraper; 23. Drive component; 231. Distributor frame gear ring; 232. Distributor frame motor; 24. Front baffle; 241. Corrugated groove; 25. Rear baffle; 251. Feed inlet; 26. 27. Spiral blades; 271. Feed plate; 271. Feed port; 28. Crusher frame; 281. Crusher rod; 282. Slide rod; 3. Rotary drum; 31. Lifting plate; 32. Material outlet; 33. Burner II; 4. Distributor cylinder drive assembly; 41. Distributor cylinder gear ring; 42. Distributor cylinder motor; 5. Rotary drum drive assembly; 51. Rotary drum gear ring; 52. Rotary drum motor; 6. Base; 61. Support ring; 62. Support roller. Detailed Implementation

[0041] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the following will be described in conjunction with the embodiments of the present invention. Figures 1-8 The technical solutions of the embodiments of the present invention will be clearly and completely described.

[0042] Example

[0043] This embodiment provides an asphalt mixture drying device, such as... Figure 1 As shown, it includes a feed cylinder 1, a distribution cylinder 2, and a rotating cylinder 3.

[0044] like Figure 1 As shown, along the conveying direction of the asphalt mixture, the feed cylinder 1, the distribution cylinder 2, and the rotating cylinder 3 are arranged sequentially and communicate with each other. The axes of the feed cylinder 1, the distribution cylinder 2, and the rotating cylinder 3 are collinear, and along the conveying direction of the asphalt mixture, the axes are inclined downwards in sequence so that the material in the feed cylinder 1 passes through the feed cylinder 1, the distribution cylinder 2, and the rotating cylinder 3 in sequence.

[0045] like Figure 1 and Figure 2 As shown, the feed cylinder 1 is mounted on the base 6, and the upper part of the feed cylinder 1 is provided with a material inlet 11. The distribution cylinder 2 is rotatably connected to the feed cylinder 1, and the rotation of the distribution cylinder 2 is driven by the distribution cylinder drive assembly 4.

[0046] like Figure 1 and Figure 2 As shown, the dispensing cylinder drive assembly 4 includes a dispensing cylinder gear ring 41 mounted on the outside of the dispensing cylinder 2 and a dispensing cylinder motor 42 that drives the dispensing cylinder gear ring 41 to rotate. A gear (not shown in the figure) that meshes with the dispensing cylinder gear ring 41 is mounted on the output shaft of the dispensing cylinder motor 42. The dispensing cylinder motor 42 drives the gear to rotate, thereby driving the dispensing cylinder gear ring 41 and the dispensing cylinder 2 to rotate.

[0047] like Figure 1 and Figure 4As shown, a burner 21 is located below the distribution cylinder 2, and a combustion hood 211 is installed on the burner 21. The combustion hood 211 and the distribution cylinder 2 are rotatably connected. The heat generated by the burner 21 is transferred to the distribution cylinder 2, and then to the asphalt mixture inside the distribution cylinder 2, for preheating the asphalt mixture.

[0048] like Figure 4 and Figure 5 As shown, a material distribution frame 22 is rotatably installed inside the material distribution cylinder 2, and the rotation of the material distribution frame 22 is driven by the driving component 23.

[0049] like Figure 4 and Figure 5 As shown, the drive unit 23 includes a material distribution rack gear ring 231 mounted at the end of the material distribution rack 22 and a material distribution rack motor 232 that drives the material distribution rack gear ring 231 to rotate. A gear (not shown in the figure) meshing with the material distribution rack gear ring 231 is mounted on the output shaft of the material distribution rack motor 232. The material distribution rack motor 232 drives the gear to rotate, thereby causing the material distribution rack gear ring 231 and the material distribution rack 22 to rotate. The rotation directions of the material distribution cylinder 2 and the material distribution rack 22 are opposite.

[0050] like Figure 4 and Figure 5 As shown, a front baffle 24 is installed at the end of the feed cylinder 1 away from the distribution cylinder 2, and a rear baffle 25 is rotatably installed at the end of the distribution cylinder 2 near the rotating cylinder 3. A support ring 61 is installed on the base 6, and the rear baffle 25 is connected to the support ring 61. Both ends of the distribution frame 22 are provided with annular mounting brackets 222, and the two mounting brackets 222 are rotatably connected to the front baffle 24 and the rear baffle 25, respectively. The distribution frame gear ring 231 is installed on the mounting bracket 222 near the rotating cylinder 3, and an opening is provided at the lower part of the support ring 61 to allow the gear on the output shaft of the distribution frame motor 232 to mesh.

[0051] like Figure 3 As shown, four screen plates 221 are installed on the material distribution frame 22 near the inner wall of the material distribution cylinder 2. The four screen plates 221 form a cylindrical structure. Gaps are left between the screen plates 221 and the inner walls of the feed cylinder 1 and the material distribution cylinder 2 to allow coarse materials to pass through.

[0052] like Figure 4 and Figure 5 As shown, a spiral blade 26 and a discharge plate 27 are provided in the middle part of the feed cylinder 1 and the distribution cylinder 2. Both the spiral blade 26 and the discharge plate 27 are located between the screen plates 221 of the cylindrical structure. The two ends of the spiral blade 26 are connected to the two ends of the distribution frame 22, and the discharge plate 27 is located below the spiral blade 26. The two ends of the discharge plate 27 are connected to the front baffle 24 and the rear baffle 25, respectively.

[0053] like Figure 2 and Figure 4As shown, the rotating drum 3 and the rear baffle 25 are rotatably connected. The material discharge plate 27 has a material discharge port 271 at one end near the rear baffle 25, and the lower part of the rear baffle 25 has a material inlet 251.

[0054] like Figure 2 and Figure 4 As shown, the asphalt mixture to be dried is fed into the material inlet 11. The screen plate 221 is located below the material inlet 11. The fine particles will pass through the screen plate 221 and enter the discharge plate 27. The spiral blades 26 rotate with the material distribution frame 22, which quickly transports the fine particles to the discharge port 271. The fine particles fall through the discharge port 271 to the bottom of the material distribution cylinder 2 and near the feed inlet 251. The rotation of the material distribution cylinder 2 drives the fine particles to enter the rotating drum 3 from the feed inlet 251 for drying.

[0055] like Figure 2 and Figure 4 As shown, larger coarse particles fall onto the screen plate 221. As the material distribution frame 22 drives the screen plate 221 to rotate, the coarse material falls from the gap between the material distribution cylinder 2 and the screen plate 221 to the bottom of the material distribution cylinder 2. As the material distribution cylinder 2 rotates, the coarse material gradually enters the rotating cylinder 3 from the feed inlet 251 for drying.

[0056] like Figure 2 and Figure 4 As shown, fine materials can enter the rotating drum 3 for drying more quickly under the conveying of the spiral blades 26, while coarse materials need to fall to the bottom of the distribution drum 2 as the screen plate 221 rotates before entering the rotating drum 3. In addition, coarse materials are closer to the drum wall of the distribution drum 2 than fine materials, so the heat on the drum wall of the distribution drum 2 is transferred to the coarse materials first. Thus, the distribution drum 2 can transfer more heat to the coarse materials than to the fine materials. After the coarse and fine materials enter the rotating drum 3 and are dried for the same amount of time, it is beneficial for the coarse and fine materials to have the same drying effect, thereby helping to reduce the over-drying of fine materials.

[0057] like Figure 4 and Figure 7 As shown, both the front baffle 24 and the rear baffle 25 are provided with multiple wave grooves 241 connected in sequence, and the multiple wave grooves 241 form a closed loop.

[0058] like Figure 3 , Figure 6 and Figure 8As shown, four grooves 223 are provided at both ends of the material distribution frame 22 along the radial direction of the material distribution cylinder 2. A crushing frame 28 is slidably mounted in two of the grooves 223 along the axial direction of the material distribution cylinder 2. A sliding rod 282 is installed at both ends of the crushing frame 28. The sliding rod 282 can pass through the groove 223 and extend into the corrugated groove 241. The sliding rod 282 can slide in the corrugated groove 241 of the front baffle 24 and the corrugated groove 241 of the rear baffle 25. The crushing frame 28 is located between the material distribution cylinder 2 and the screen plate 221. Multiple crushing rods 281 are installed on the crushing frame 28.

[0059] like Figure 3 and Figure 6 As shown, the slide rod 282 passes through the slide groove 223 and can slide within the slide groove 223. The material distribution frame 22 drives the slide groove 223 to rotate, while simultaneously driving the slide rod 282 and the crushing frame 28 to rotate. The slide rod 282 extends into the corrugated groove 241. While rotating, the slide rod 282 slides along the corrugated groove 241, allowing the slide rod 282 and the crushing frame 28 to reciprocate between the screen plate 221 and the inner wall of the material distribution cylinder 2. The crushing rod 281 can crush the coarse material on the screen plate 221, which helps to reduce the phenomenon that existing asphalt mixture recycled material is prone to clumping due to its own weight during storage. This, in turn, helps to evenly heat the internal moisture and asphalt of the clumps, improving the drying effect.

[0060] like Figure 3 As shown, four scrapers 224 are spaced apart on the material distribution frame 22. The four scrapers 224 are located between two adjacent screen plates 221. The scrapers 224 extend from the inside of the feed cylinder 1 into the material distribution cylinder 2. The scrapers 224 abut against the inner walls of both the feed cylinder 1 and the material distribution cylinder 2.

[0061] like Figure 3 and Figure 4 As shown, since the distribution frame 22 and the distribution cylinder 2 rotate in opposite directions, the distribution frame 22 drives the scraper 224 to rotate synchronously during its rotation. The scraper 224 scrapes the material adhering to the inner wall of the distribution cylinder 2 and the feed cylinder 1, reducing the workload of cleaning the distribution cylinder 2 and the feed cylinder 1, and also helping to reduce the impact of the material adhering to the inner wall of the distribution cylinder 2 on heat exchange. In addition, the rotation of the scraper 224 can drive the coarse material in the feed cylinder 1 to move into the distribution cylinder 2, where it is preheated.

[0062] like Figure 1 As shown, the rotation of the rotating drum 3 is driven by the rotating drum drive assembly 5. The rotating drum drive assembly 5 includes a rotating drum gear ring 51 mounted on the rotating drum 3 and a rotating drum motor 52 that drives the rotating drum gear ring 51 to rotate. A gear (not shown in the figure) that meshes with the rotating drum gear ring 51 is mounted on the output shaft of the rotating drum motor 52. The rotating drum motor 52 drives the gear to rotate, thereby driving the rotating drum gear ring 51 and the rotating drum 3 to rotate.

[0063] like Figure 1 and Figure 2 As shown, the rotary drum motor 52, the feed cylinder motor 42, and the feed rack motor 232 are all mounted on the base 6. Support rollers 62 supporting the rotary drum 3 are rotatably mounted on both sides of the base 6.

[0064] like Figure 2 As shown, multiple lifting plates 31 are installed at intervals on the inner wall of the rotating drum 3. As the asphalt mixture inside the rotating drum 3 rotates with the drum 3, the lifting plates 31 can lift the material, which helps to improve the uniformity of material drying.

[0065] like Figure 1 and Figure 4 As shown, a second burner 33 capable of heating the rotating drum 3 is provided at one end away from the distribution drum 2, and a material outlet 32 ​​is provided below the second burner 33 on the rotating drum 3. An air outlet 12 is provided at one end away from the distribution drum 2 on the feeding drum 1.

[0066] like Figure 1 and Figure 4 As shown, the heat generated by burner 2 33 is transferred to the rotating drum 3 and dries the material inside the rotating drum 3. The hot air is discharged from the air outlet 12, and the dried asphalt mixture is discharged from the material outlet 32.

[0067] The implementation principle of an asphalt mixture drying device in this embodiment is as follows:

[0068] Burner 1 21 heats the distribution cylinder 2, and burner 2 33 heats the rotating drum 3. The asphalt mixture to be dried is fed into the material inlet 11. The fine particles will pass through the screen plate 221 and enter the discharge plate 27. The fine particles are preheated in the distribution cylinder 2. The spiral blades 26 rotate with the distribution frame 22, which quickly transports the fine particles to the discharge port 271. Then, the fine particles fall through the discharge port 271 to the bottom of the distribution cylinder 2 and near the feed inlet 251. The rotation of the distribution cylinder 2 drives the fine particles to enter the rotating drum 3 from the feed inlet 251 for drying.

[0069] Larger particles fall onto the screen plate 221. As the distribution frame 22 drives the screen plate 221 to rotate, the coarse material falls from the gap between the feed cylinder 1 and the screen plate 221 to the bottom of the feed cylinder 1, or from the gap between the distribution cylinder 2 and the screen plate 221 to the bottom of the distribution cylinder 2. As the distribution frame 22 drives the scraper 224 to rotate, the coarse material at the bottom of the feed cylinder 1 moves into the distribution cylinder 2 for preheating. The scraper 224 scrapes the material adhering to the inner wall of the distribution cylinder 2 and the feed cylinder 1. As the distribution cylinder 2 rotates, the coarse material gradually enters the rotating drum 3 from the feed inlet 251 for drying.

[0070] While the material distribution frame 22 drives the slide 223 to rotate, it also drives the slide rod 282 and the crushing frame 28 to rotate. While rotating, the slide rod 282 slides along the corrugated groove 241, so that the slide rod 282 and the crushing frame 28 can reciprocate between the screen plate 221 and the inner wall of the material distribution cylinder 2. The crushing rod 281 can crush the coarse material on the screen plate 221.

[0071] After the asphalt mixture enters the rotating drum 3 for drying, it is discharged from the material outlet 32.

[0072] Furthermore, it should be noted that, in the description of this invention, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "linkage" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components.

Claims

1. An asphalt mixture drying device, comprising a rotating drum (3) and a rotating drum drive assembly (5) for driving the rotating drum (3) to rotate, characterized in that: One end of the rotating drum (3) is provided with a material distribution cylinder (2), and the rotation of the material distribution cylinder (2) is driven by the material distribution cylinder drive assembly (4); A material distribution frame (22) is rotatably provided inside the material distribution cylinder (2). The material distribution frame (22) is driven by a drive component (23). Multiple screen plates (221) are installed on the material distribution frame (22) near the inner wall of the material distribution cylinder (2). The multiple screen plates (221) form a cylindrical structure. There is a gap between the screen plates (221) and the inner wall of the material distribution cylinder (2). A spiral blade (26) is provided between multiple screen plates (221). The spiral blade (26) is connected to the material distribution frame (22). A material drop plate (27) is provided below the spiral blade (26). The material distribution cylinder (2) and the rotating cylinder (3) are connected. A burner (21) that can heat the material distribution cylinder (2) is provided below the material distribution cylinder (2). The axis of the material distribution cylinder (2) gradually slopes downward from the end away from the rotating cylinder (3) to the end close to the rotating cylinder (3). The rotation directions of the material distribution cylinder (2) and the material distribution frame (22) are opposite. Both ends of the feed cylinder (2) are rotatably connected to a front baffle (24) and a rear baffle (25). Both the front baffle (24) and the rear baffle (25) are provided with multiple wave grooves (241) connected in sequence. The feed rack (22) is provided with a sliding groove (223). The crushing rack (28) is slidably installed in the sliding groove (223). Both ends of the crushing rack (28) can slide in the wave groove (241) of the front baffle (24) and the wave groove (241) of the rear baffle (25), respectively. The crushing rack (28) is located between the feed cylinder (2) and the screen plate (221). Multiple crushing rods (281) are installed on the crushing rack (28).

2. The asphalt mixture drying device according to claim 1, characterized in that: The rear baffle (25) is located between the material distribution cylinder (2) and the rotating cylinder (3). The rear baffle (25) and the rotating cylinder (3) are rotatably connected. The discharge plate (27) is installed between the front baffle (24) and the rear baffle (25). The discharge plate (27) has a discharge port (271) at one end near the rear baffle (25), and the lower part of the rear baffle (25) has a feed port (251).

3. The asphalt mixture drying device according to claim 2, characterized in that: The material distribution rack (22) is equipped with a scraper (224) that can abut against the inner wall of the material distribution cylinder (2).

4. The asphalt mixture drying device according to claim 3, characterized in that: Both ends of the crusher (28) are equipped with slide rods (282), which can pass through the slide groove (223) and extend into the corrugated groove (241).

5. The asphalt mixture drying device according to claim 4, characterized in that: The feed cylinder (1) is rotatably connected to the end of the feed cylinder (2) away from the rotating cylinder (3). The feed cylinder (1) has a material inlet (11) at the top. The front baffle (24) is installed inside the feed cylinder (1). The end of the feed rack (22) is rotatably connected to the end of the feed cylinder (1) away from the feed cylinder (2).

6. The asphalt mixture drying device according to claim 5, characterized in that: A second burner (33) that can heat the rotating drum (3) is provided at one end away from the distribution cylinder (2). A material outlet (32) is provided below the second burner (33) on the rotating drum (3). An air outlet (12) is provided at one end away from the distribution cylinder (2) on the feeding cylinder (1).

7. The asphalt mixture drying device according to claim 6, characterized in that: Multiple lifting plates (31) are installed at intervals on the inner wall of the rotating drum (3).

8. The asphalt mixture drying device according to claim 7, characterized in that: The dispensing cylinder drive assembly (4) includes a dispensing cylinder gear ring (41) installed on the outside of the dispensing cylinder (2) and a dispensing cylinder motor (42) that drives the dispensing cylinder gear ring (41) to rotate.

9. The asphalt mixture drying device according to claim 8, characterized in that: The drive unit (23) includes a material rack gear ring (231) installed at the end of the material rack (22) and a material rack motor (232) that drives the material rack gear ring (231) to rotate.

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