A foamed asphalt recycling system and recycling method

Abstract

The present invention relates to the field of foamed asphalt recycling technology, and specifically to a foamed asphalt recycling system. It also relates to a foamed asphalt recycling method. It includes an old asphalt layer crushing device and a foamed asphalt mixing device. The old asphalt layer crushing device is a multi-stage crushing device. The multi-stage crushing device includes a crushing chamber, and a plurality of layers of conical crushing rings installed in the crushing chamber and arranged in sequence along the vertical direction, and a rotating shaft installed vertically in the crushing chamber for driving the conical crushing rings to rotate. The inner wall of the crushing chamber is provided with conical step grooves corresponding to the plurality of layers of conical crushing rings. A crushing cavity for crushing the old asphalt layer is formed between the conical crushing ring and the conical step groove. A material screening cavity for automatically screening material fragments is formed between the outer wall of each conical crushing ring and the inner wall of the crushing chamber. The present invention can fully crush the old asphalt layer at multiple stages, realize the old asphalt recovery function, improve the screening accuracy, and reduce the possibility of repeated crushing.

Description

Technical Field

[0001] The present invention relates to the technical field of foamed asphalt recycling and regeneration, and in particular to a foamed asphalt recycling system and a foamed asphalt recycling method. Background Art

[0002] The foamed asphalt cold recycling technology uses the good properties of foamed asphalt to clean the asphalt surface layer with a milling machine, neatly mill the road surface that needs to be overhauled to the base surface, and use a loader to pull the scrap back to the material yard for storage and recycling, and then spread foamed asphalt concrete. The paving of new roads is not restricted by weather conditions, and construction can still be carried out on cold and rainy days.

[0003] The broken old asphalt pavement may not be completely broken during the extrusion and crushing process of the milling material, resulting in large blocks of old asphalt pavement in the broken material. When it is mixed with foamed asphalt, it causes uneven mixing, reduces the quality of the new mixture, and thus affects the finishing of the asphalt pavement. At the same time, the broken milling material can only be screened once, which is not convenient for further screening.

[0004] In the prior art, the shaved waste materials need to be pulled back to the material yard by a loader, or they need to be cold-regenerated on-site by large-scale integrated mechanical engineering equipment. The method of pulling the materials back reduces work efficiency, cannot be used on-site, is labor-intensive and time-consuming, and the existing large-scale integrated mechanical engineering equipment is relatively expensive, which is not conducive to large-scale use, and cannot quickly repair broken ground in small-scale projects and batches, and has a limited scope of application.

[0005] In the prior art, when performing multi-stage crushing, screening is usually performed at the final discharge point, and the unqualified materials are then re-introduced into the crushing device for re-crushing. However, the re-crushing level cannot be reasonably allocated according to the size of the unqualified materials, and smaller materials are repeatedly crushed, resulting in low crushing efficiency. Summary of the invention

[0006] Based on this, it is necessary to provide a foamed asphalt recovery system and recovery method to address the existing technical problems. The crushing chamber can achieve a multi-stage sufficient crushing effect on the old asphalt layer, and the fully crushed old asphalt layer can be mixed with the foamed asphalt through a foamed asphalt mixing device to achieve the recovery function of the old asphalt layer. The secondary screening function is realized in the material receiving channel, which improves the screening accuracy and reduces the possibility of repeated crushing.

[0007] In order to solve the problems of the prior art, the technical solution adopted by the present invention is:

[0008] The present invention provides a foamed asphalt recovery system, comprising an old asphalt layer crushing device and a foamed asphalt mixing device. The old asphalt layer crushing device is a multi-stage crushing device, which comprises a crushing chamber, and a plurality of layers of conical crushing rings installed in the crushing chamber and arranged in sequence along the vertical direction, and a rotating shaft installed vertically in the crushing chamber for driving the conical crushing rings to rotate. The inner wall of the crushing chamber is provided with conical step grooves corresponding to the plurality of layers of conical crushing rings one by one, and a crushing cavity for crushing the old asphalt layer is formed between the conical crushing rings and the conical step grooves. The cavity heights of the plurality of crushing cavities gradually decrease from top to bottom, and a feeding screening cavity for automatically screening material fragments is formed between the outer side wall of each conical crushing ring and the inner wall of the crushing chamber. The screening material size of the feeding screening cavity matches the crushing effect of the corresponding conical crushing ring, and the screening material size of the plurality of feeding screening cavities gradually decreases from top to bottom. A feeding port is provided at the top of the crushing chamber, and a discharging port is provided at the bottom of the crushing chamber.

[0009] Preferably, a discharge port is provided on the crushing chamber along the inclination direction of the surface of the conical crushing ring, and there are several discharge ports. The discharge ports are located at the connection between the crushing chamber and the material screening chamber. The several discharge ports correspond one-to-one to the several conical crushing rings. The size of the discharge port is consistent with the cavity height of the corresponding upper crushing cavity, and the size of the discharge port is larger than the screen size of the material screening cavity of this layer.

[0010] Preferably, the discharge port on the outer wall of the crushing chamber is connected to a receiving channel for receiving materials, and there are several receiving channels. Each discharge port on the crushing chamber is connected to a corresponding receiving channel, and the size of the receiving channel is consistent with the size of the corresponding discharge port.

[0011] Preferably, a return port is provided at one end of the material receiving channel close to the discharge port, and the return port is arranged below the discharge port. The screening size of the return port and the material screening cavity at the corresponding position of the discharge port are consistent.

[0012] Preferably, the multi-stage crushing device also includes a screw feeder, which is obliquely arranged on the side of the crushing chamber, with the top of the screw feeder located above the feed inlet of the crushing chamber, and the ends of several material receiving channels away from the discharge port are connected to the lower half of the screw feeder.

[0013] Preferably, a re-entry channel is provided between the screw feeder and the crushing chamber, and a plurality of re-entry channels are provided, the number of which is one less than the number of discharge ports, one end of the re-entry channel is located at the upper half of the screw feeder, and the other end of the re-entry channel passes through the outer wall of the crushing chamber and is connected to the crushing chamber in the crushing chamber, the channel sizes of the plurality of re-entry channels decrease from top to bottom, and the channel size of the re-entry channel is consistent with the cavity height of the crushing cavity at the connection between the re-entry channel and the crushing chamber.

[0014] Preferably, the connection between the material receiving channel and the screw conveyor is located at the upper half of the screw conveyor along its inclined surface, and the connection between the re-entry channel and the screw conveyor is located at the lower half of the screw conveyor along its inclined surface.

[0015] Preferably, a first crushing tooth and a second crushing tooth are provided in the crushing chamber, the first crushing tooth is located on the upper conical surface of the conical crushing ring at a position corresponding to the crushing chamber, the first crushing teeth are densely distributed on the conical crushing ring in a ring shape along the axis direction of the rotating shaft, the second crushing teeth are located on the conical step groove at a corresponding position on the inner wall of the crushing chamber, and the second crushing teeth are densely distributed in a ring shape along the axis direction of the rotating shaft on the step surface of the conical step groove having the same inclination angle as the first crushing tooth.

[0016] Preferably, a vertical section is provided at the top feed port of the crushing chamber, a feed paddle is provided in the vertical section, an outer wall of the feed paddle is fitted with an inner wall of the vertical section, and the feed paddle is fixedly connected to the top of the rotating shaft.

[0017] A method for recovering foamed asphalt is also provided, comprising the following steps:

[0018] S1: Shovel up the broken old asphalt layer and introduce it into the feeding port of the crushing chamber;

[0019] S2: Start the multi-stage crushing device. The rotating shaft rotates to drive several layers of conical crushing rings to rotate inside the crushing chamber. The conical crushing rings and the inner wall of the crushing chamber form a crushing chamber for crushing the old asphalt layer and a material screening chamber for screening the old asphalt layer;

[0020] S3: The old asphalt layer is crushed in multiple stages in the crushing chamber. The qualified materials in each layer enter the lower layer, and the materials that do not meet the requirements in each layer are blocked by the material screening chamber and discharged through the discharge port after rotating to a certain position;

[0021] S4: The materials that do not meet the requirements are poured into the discharge channel after passing through the discharge port. After screening, the qualified materials that mistakenly enter the discharge channel are re-introduced into the lower crushing chamber through the return port;

[0022] S5: The material that does not meet the requirements is introduced into the screw conveyor through the discharge channel, transported upward by the screw conveyor, and re-introduced into the crushing chamber through the re-entry channel or the crushing chamber inlet;

[0023] S6: The crushed material is discharged from the discharge port of the crushing chamber, and is mixed with the foamed asphalt through the foamed asphalt mixing device to achieve the recycling function of the old asphalt layer.

[0024] Compared with the prior art, the present invention has the following beneficial effects:

[0025] 1. The crushing chamber can achieve a multi-stage full crushing effect on the old asphalt layer, and the fully crushed old asphalt layer is mixed with foamed asphalt through a foamed asphalt mixing device to achieve the recycling function of the old asphalt layer, improve the mixing effect, and increase the recycling rate.

[0026] 2. The function of secondary screening is realized in the material receiving channel, which improves the screening accuracy and reduces the possibility of repeated crushing.

[0027] 3. The screw feeder uses the re-entry channel to ensure that materials that do not meet the crushing size only enter the crushing chamber of the upper layer for re-crushing, avoiding the situation where all discharged materials have to be crushed in sequence by the first-level crushing mechanism, greatly improving the crushing efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] Figure 1 It is a three-dimensional structural diagram of a foamed asphalt recovery system;

[0029] Figure 2 It is a front view of a foamed asphalt recycling system;

[0030] Figure 3 It is a top view of a foamed asphalt recycling system;

[0031] Figure 4 yes Figure 3 Sectional view at AA in the middle;

[0032] Figure 5 yes Figure 3 Sectional view at the middle BB;

[0033] Figure 6 It is a three-dimensional structural schematic diagram of a foaming device in a foamed asphalt recovery system;

[0034] Figure 7 It is a three-dimensional structural diagram of a crushing chamber in a foamed asphalt recovery system;

[0035] Figure 8 yes Figure 4 The enlarged view of the part at C in the middle and the schematic diagram of the material crushing direction;

[0036] Fig. 9 yes Figure 4 The partial enlarged view of point E in the middle and the schematic diagram of material screening direction;

[0037] Fig.10 It is a three-dimensional structural diagram of a conical crushing ring in a foamed asphalt recovery system;

[0038] Fig.11 It is a cross-sectional view of a conical crushing ring in a foamed asphalt recovery system;

[0039] Fig.12 The present invention is a flow chart of a method for recovering foamed asphalt.

[0040] The numbers in the figure are:

[0041] 1- Crushing chamber;

[0042] 11-conical stepped groove;

[0043] 12- Crushing chamber;

[0044] 13- material screening chamber;

[0045] 14-feeding port;

[0046] 15-discharging port;

[0047] 16-discharge port;

[0048] 17-material receiving channel; 171-return material port;

[0049] 18-Reentry channel;

[0050] 19- second crushing tooth;

[0051] 2-conical crushing ring;

[0052] 21- first crushing tooth;

[0053] 3- Crushing drive device;

[0054] 31-rotating shaft;

[0055] 32-rotation drive motor;

[0056] 33- driving wheel;

[0057] 34- driven wheel;

[0058] 35-feeding paddle;

[0059] 4- Foaming device;

[0060] 41-High temperature asphalt spray nozzle;

[0061] 42-water medium nozzle;

[0062] 43- High-pressure air nozzle;

[0063] 44-foaming tube;

[0064] 5-throwing roller;

[0065] 6-Mixing box;

[0066] 7-Screw conveyor. DETAILED DESCRIPTION

[0067] In order to further understand the features, technical means, specific objectives and functions of the present invention, the present invention is further described in detail below in conjunction with the accompanying drawings and specific implementation methods.

[0068] like Figures 1 to 5 The foamed asphalt recycling system shown in the figure includes an old asphalt layer crushing device and a foamed asphalt mixing device. The old asphalt layer crushing device is a multi-stage crushing device, which includes a crushing chamber 1, and a plurality of layers of conical crushing rings 2 installed in the crushing chamber 1 and arranged in sequence along the vertical direction, and a rotating shaft 31 installed vertically in the crushing chamber 1 for driving the conical crushing rings 2 to rotate. The inner wall of the crushing chamber 1 is provided with conical step grooves 11 corresponding to the plurality of layers of conical crushing rings 2. The conical crushing rings 2 and the conical step grooves 11 are connected to each other. A crushing cavity 12 for crushing the old asphalt layer is formed between the ladder grooves 11, and the cavity height of several crushing cavities 12 gradually decreases from top to bottom. A material screening cavity 13 for automatically screening material fragments is formed between the outer wall of each conical crushing ring 2 and the inner wall of the crushing chamber 1. The screening material size of the material screening cavity 13 matches the crushing effect of the corresponding conical crushing ring 2. The screening material size of several material screening cavities 13 gradually decreases from top to bottom. A material inlet 14 is provided at the top of the crushing chamber 1, and a material outlet 15 is provided at the bottom of the crushing chamber 1.

[0069] During operation, the crushing chamber 1 can achieve a multi-stage full crushing effect on the old asphalt layer, and the fully crushed old asphalt layer is mixed with the foamed asphalt through the foamed asphalt mixing device to achieve the recovery function of the old asphalt layer. Several layers of conical crushing rings 2 and conical stepped grooves 11 corresponding to the several layers of conical crushing rings 2 can achieve a multi-stage crushing effect on the old asphalt layer in the crushing chamber 1. The crushing chamber 12 with a gradually decreasing cavity height from top to bottom can gradually crush the material into finer fragments. The unloading screening chamber 13 corresponding to the conical crushing ring 2 can guide the material that meets the size of each layer of fragments after crushing into the next layer for crushing until the material size that is optimally required for mixing with foamed asphalt is reached, and then the material is discharged through the discharge port 15 to improve the mixing effect and the recycling rate.

[0070] It is worth mentioning that the cavity height of the crushing cavity 12 is the shortest distance between the conical crushing ring 2 and the conical stepped groove 11 at the corresponding position; the crushing cavity is an annular conical area, and the feeding cavity is an annular area formed by the gap between the conical crushing ring 2 and the crushing chamber 1.

[0071] like Figure 7The multi-stage crushing device shown also includes a crushing drive device 3, which is transmission-connected to the rotating shaft 31. The crushing drive device 3 includes a rotary drive motor 32, a driving wheel 33 and a driven wheel 34. The rotary drive motor 32 is transmission-connected to the driving wheel 33. The driven wheel 34 is fixedly mounted on the bottom of the rotating shaft 31. The driven wheel 34 is transmission-connected to the driving wheel 33 through a transmission belt, thereby driving the rotating shaft 31 to rotate, thereby realizing the crushing drive function.

[0072] like Figures 1 to 4 The foamed asphalt mixing device shown includes a foaming device 4, a throwing roller 5 and a mixing box 6. The mixing box 6 is arranged on the side of the crushing chamber 1. The throwing roller 5 is rotatably arranged at the discharge end of the crushing chamber 1. The foaming device 4 is located above the mixing box 6. The throwing roller 5 is driven to rotate by a motor. During the rotation, the completely crushed old asphalt layer gravel discharged from the bottom of the crushing chamber 1 is thrown into the mixing box 6, so that the old asphalt layer gravel falls into the mixing box 6 in a parabolic manner. The foaming device 4 sprays the foamed asphalt on the sprinkled old asphalt layer, thereby improving the mixing efficiency and the mixing effect of the old asphalt layer and the foamed asphalt. After being evenly mixed, it can be repaved, that is, the recycling rate of the old asphalt layer is improved, and the regeneration function is realized.

[0073] like Figure 6 The foaming device 4 shown includes a high-temperature asphalt nozzle 41, a water medium nozzle 42, a high-pressure gas nozzle 43 and a foaming tube 44. The foaming tube 44 is vertically arranged at the top of the mixing box 6. The high-temperature asphalt nozzle 41 is arranged at the top of the foaming tube 44. The high-temperature asphalt nozzle 41 vertically sprays high-temperature asphalt into the foaming tube 44 downward. The water medium nozzle 42 and the high-pressure gas nozzle 43 are symmetrically arranged along the vertical plane of the center of the foaming tube 44. The angle between the water medium nozzle 42 and the high-temperature asphalt nozzle 41 does not exceed thirty degrees. The water medium nozzle 42 is inclined downward. The connecting line of the water medium nozzle 42 and the high-pressure gas nozzle 43 is located at the downward spraying asphalt of the high-temperature asphalt nozzle 41. After the water contacts the high-temperature asphalt, the asphalt expands rapidly in the foaming tube 44 to produce foamed asphalt, and the foamed asphalt is sprayed into the mixing box 6 below through the foaming tube 44, and then fully contacts with the old asphalt layer thrown into the mixing box 6 by the throwing roller 5, so as to achieve the mixing effect.

[0074] like Figures 1 to 5 as well as Fig. 9 The crushing chamber 1 shown is provided with a discharge port 16 along the inclined direction of the surface of the conical crushing ring 2. There are a plurality of discharge ports 16, which are located at the connection between the crushing chamber 12 and the material screening chamber 13. The plurality of discharge ports 16 correspond to a plurality of conical crushing rings 2 one by one. The size of the discharge port 16 is consistent with the cavity height of the corresponding upper crushing cavity 12, and the size of the discharge port 16 is larger than the screening size of the material in the material screening chamber 13 of this layer.

[0075] During operation, if the larger fragments that have not been completely crushed in the crushing chamber 12 will stay between the crushing chamber 12 and the material screening chamber 13, and this position cannot further crush the substandard materials so that they can pass through the material screening chamber 13 and enter the next layer of crushing chamber 12, it is easy to cause the substandard materials to accumulate here, affecting the crushed materials that meet the standards to pass through the material screening chamber 13, resulting in reduced crushing efficiency. Therefore, by opening a discharge port 16 on the side wall of the connection between the crushing chamber 12 and the material screening chamber 13 of each layer, the larger materials accumulated at the above position can be discharged, so that the qualified materials can fall normally, which is convenient for the normal screening work.

[0076] In the above-mentioned discharging process, since the size of the discharging port 16 is larger than the material selection size of the unloading screening chamber 13, larger materials can be discharged from the crushing chamber 1, and since it is a layered design, the size of the material discharged from the discharging port 16 of each layer gradually decreases from top to bottom, and the size of the discharging port 16 is controlled according to the screening requirements and the size of the crushing chamber 12 of each layer.

[0077] It is worth mentioning that a vertically arranged push plate can also be installed on the conical crushing ring 2. The push plate is located at the outermost side of the conical crushing ring 2. The push plate pushes the material stuck between the crushing chamber 12 and the feeding screening chamber 13 in the process of following the conical crushing ring 2 until it is pushed to the discharge port 16 of this layer. Due to the action of gravity, the material is discharged outward from the discharge port 16 along the inclined surface of the outer side wall of the lower crushing chamber 1.

[0078] like Figure 1 to Figure 2 The discharge port 16 on the outer wall of the crushing chamber 1 shown is connected to a receiving channel 17 for receiving materials. There are several receiving channels 17, and each discharge port 16 on the crushing chamber 1 is connected to a corresponding receiving channel 17, and the size of the receiving channel 17 is consistent with the size of the corresponding discharge port 16.

[0079] The materials discharged from the discharge port 16 need to be collected, and the materials discharged from each layer of the discharge port 16 can be collected in layers through the material receiving channel 17, so as to facilitate the subsequent re-crushing of materials that do not meet the standards and improve the utilization rate of the old asphalt layer gravel.

[0080] like Figure 1 to Figure 2 The end of the material receiving channel 17 close to the discharge port 16 is provided with a return port 171, which is arranged below the discharge port 16. The screening size of the return port 171 and the material screening cavity 13 at the corresponding position of the discharge port 16 are consistent.

[0081] When discharging larger materials at the discharge port 16, the materials that have been crushed and meet the standards will also be discharged through the discharge port 16 during the discharging process. If this part of the material is collected and then crushed again, the workload of crushing will increase, the work efficiency will be reduced, and the material will be easily crushed to a smaller size that does not meet the requirements. Therefore, it is necessary to conduct a secondary screening of the materials that have met the crushing standards through the discharge channel so that the materials that have met the crushing standards can flow back to the crushing chamber 12 of the next layer for further crushing, so as to improve the crushing efficiency and reduce the possibility of repeated crushing.

[0082] Therefore, a return port 171 corresponding to the screening size of the material discharge screening chamber 13 of this layer is opened at the lower side of the top end of the material receiving channel 17, so that the materials that meet the requirements can be returned to the lower crushing chamber 12, and the materials that do not meet the requirements cannot enter the lower space through the return port 171, and can only run downward along the material receiving channel 17, that is, the function of secondary screening is realized in the material receiving channel 17, thereby improving the screening accuracy.

[0083] like Figures 4 to 5 The multi-stage crushing device shown also includes a screw feeder 7, which is obliquely arranged on the side of the crushing chamber 1, and the top of the screw feeder 7 is located above the feed inlet 14 of the crushing chamber 1, and the ends of several receiving channels 17 away from the discharge port 16 are connected to the lower half of the screw feeder 7.

[0084] The materials in the several receiving channels 17 connected thereto are received by the screw conveyor 7 and transferred upward. The materials are transmitted upward along the inclined direction of the screw conveyor 7. After being transported to the designated position, the materials fall back into the crushing chamber 1, thereby achieving a secondary crushing effect.

[0085] like Figures 4 to 11 A reentry channel 18 is further provided between the screw feeder 7 and the crushing chamber 1. A plurality of reentry channels 18 are provided, and the number of reentry channels 18 is one less than the number of discharge ports 16. One end of the reentry channel 18 is located at the upper half of the screw feeder 7, and the other end of the reentry channel 18 passes through the outer wall of the crushing chamber 1 and communicates with the crushing chamber 12 in the crushing chamber 1. The channel sizes of the plurality of reentry channels 18 decrease from top to bottom, and the channel size of the reentry channel 18 is consistent with the cavity height of the crushing cavity 12 at the connection between the reentry channel 18 and the crushing chamber 1.

[0086] The re-entry channel 18 of the screw feeder 7 can re-introduce the materials discharged from the receiving channel 17 into the crushing chamber 1. At this time, the materials that do not meet the requirements will be introduced into the crushing chamber 12 of the upper layer through the re-entry channel 18 of corresponding size and re-crushed, so that the unfinished crushed materials can be fully crushed until they meet the crushing requirements of this layer, thereby improving the crushing effect and avoiding the situation where the crushing efficiency is reduced due to crossing multiple layers.

[0087] like Figures 7 to 11 The connection between the material receiving channel 17 and the screw conveyor 7 is located at the upper half of the screw conveyor 7 along its inclined surface, and the connection between the re-entry channel 18 and the screw conveyor 7 is located at the lower half of the screw conveyor 7 along its inclined surface.

[0088] The end of the material receiving channel 17 needs to guide the incompletely crushed materials into the screw conveyor 7, and then the incompletely crushed materials are transferred upward through the screw conveyor 7 until they meet the re-entry channel 18 of a size that matches them, and then they are discharged from the re-entry channel 18. However, in this process, due to the inclined setting of the screw conveyor 7, the connection between the end of the material receiving channel 17 and the screw conveyor 7 is prone to material piling, resulting in the inability to guide the materials in the material receiving channel 17 into the screw conveyor 7, and the smaller materials in the lower layer will be driven to move upward under the action of the screw conveyor 7, but will be discharged in the larger material receiving channel 17 on the upper layer, and the function of guiding them into the re-entry channel 18 will be realized, resulting in the inability of the screw conveyor 7 to realize the function of layered feeding.

[0089] The receiving channel 17 is arranged in a gradually spiral downward manner, and the end of the receiving channel 17 is introduced into the upper half of the screw conveyor 7 along its inclined surface, and the logistics in the receiving channel 17 falls into the screw conveyor 7 and is transferred to the lower half of the screw conveyor 7 along its inclined surface. During the entire material rising process, the material is located in the lower half of the screw conveyor 7 along its inclined surface, so there will be no situation where the material is blocked in the receiving channel 17 or introduced into the upper larger receiving channel 17, thereby realizing the normal transportation process of the material, and due to the connection between the re-entry channel 18 and the screw conveyor 7 Located at the lower half of the screw conveyor 7 along its inclined surface, the materials will gradually pass through the inlet end of the re-entry channel 18. According to the size of the materials, the smaller logistics will be gradually separated until the largest materials that cannot enter the re-entry channel 18 are discharged from the top of the screw conveyor 7 to the inlet 14 of the crushing chamber 1. When the materials pass through the re-entry channel 18 in sequence, the function of the materials that do not meet the crushing size only entering the crushing chamber 12 of the upper layer for re-crushing is realized, avoiding the method in which all the discharged logistics have to be crushed in sequence by the first-level crushing mechanism, thereby greatly improving the crushing efficiency.

[0090] like Fig. 9The crushing chamber 12 shown is provided with a first crushing tooth 21 and a second crushing tooth 19. The first crushing tooth 21 is located on the upper conical surface of the conical crushing ring 2 at a position corresponding to the crushing chamber 12. The first crushing teeth 21 are densely distributed in a ring shape on the conical crushing ring 2 along the axial direction of the rotating shaft 31. The second crushing teeth 19 are located on the conical step groove 11 at a corresponding position on the inner side wall of the crushing chamber 1. The second crushing teeth 19 are densely distributed in a ring shape on the step surface of the conical step groove 11 at the same inclination angle as the first crushing teeth 21 along the axial direction of the rotating shaft 31.

[0091] The first crushing teeth 21 and the second crushing teeth 19 are densely distributed in the crushing chamber 12. When the rotating shaft 31 drives the conical crushing ring 2 connected thereto to rotate, the first crushing teeth 21 rotate synchronously with the conical crushing ring 2, so that the old asphalt layer fragments located in the crushing chamber 12 are crushed under the joint action of the first crushing teeth 21 and the second crushing teeth, and the large asphalt layer fragments are crushed and separated.

[0092] like Figure 1 to Figure 2 A vertical section is provided at the top feed port 14 of the crushing chamber 1 shown in the figure. A feed paddle 35 is provided in the vertical section. The outer wall of the feed paddle 35 is in contact with the inner wall of the vertical section. The feed paddle 35 is fixedly connected to the top of the rotating shaft 31 .

[0093] The vertical section at the top of the crushing chamber 1 connects the feed port 14 of the crushing chamber 1 with the inner cavity of the crushing chamber 1. In order to ensure that the old asphalt layer fragments enter the crushing chamber 12 located at the uppermost layer downward at the feed port 14, it is not only necessary to use the old asphalt layer fragments' own gravity, but also to rotate the rotating shaft 31 to drive the feed paddle 35 in the vertical section to rotate. The rotation of the feed paddle 35 continuously squeezes the material downward, so that the old asphalt layer fragments can enter the crushing chamber 12 more quickly and smoothly to start crushing, thereby improving the crushing efficiency and reducing the risk of large old asphalt layer fragments piling up at the feed port 14.

[0094] like Fig.12 A method for recovering foamed asphalt is shown, comprising the following steps:

[0095] S1: Shovel up the broken old asphalt layer and introduce it into the feed port 14 of the crushing chamber 1;

[0096] S2: Start the multi-stage crushing device, the rotating shaft 31 rotates to drive several layers of conical crushing rings 2 to rotate inside the crushing chamber 1, and the conical crushing rings 2 and the inner wall of the crushing chamber 1 form a crushing chamber 12 for crushing the old asphalt layer and a material screening chamber 13 for screening the old asphalt layer;

[0097] S3: The old asphalt layer is crushed in multiple stages in the crushing chamber 1. The qualified materials in each layer enter the lower layer, and the materials that do not meet the requirements in each layer are blocked by the material screening chamber 13 and discharged through the discharge port 16 after rotating to a certain position;

[0098] S4: The materials that do not meet the requirements are poured into the discharge channel after passing through the discharge port 16. After screening, the qualified materials that mistakenly enter the discharge channel are re-introduced into the lower crushing chamber 12 through the return port 171;

[0099] S5: The material that does not meet the requirements is introduced into the screw conveyor 7 through the discharge channel, transported upward by the screw conveyor 7, and re-introduced into the crushing chamber 1 through the re-entry channel 18 or the inlet 14 of the crushing chamber 1;

[0100] S6: The crushed material is discharged from the discharge port 15 of the crushing chamber 1, and is mixed with the foamed asphalt through the foamed asphalt mixing device to achieve the recycling function of the old asphalt layer.

[0101] The above embodiments only express one or several implementation modes of the present invention, and the descriptions thereof are relatively specific and detailed, but they cannot be understood as limiting the scope of the present invention. It should be pointed out that, for a person of ordinary skill in the art, several modifications and improvements can be made without departing from the concept of the present invention, and these all belong to the protection scope of the present invention. Therefore, the protection scope of the present invention patent shall be subject to the attached claims.

Claims

1. A foamed asphalt recovery system, comprising an old asphalt layer crushing device and a foamed asphalt mixing device, characterized in that: The old asphalt layer crushing device is a multi-stage crushing device, which includes a crushing chamber (1), a plurality of conical crushing rings (2) installed in the crushing chamber (1) and arranged in sequence along the vertical direction, and a rotating shaft (31) installed vertically in the crushing chamber (1) for driving the conical crushing rings (2) to rotate, and the inner wall of the crushing chamber (1) is provided with conical stepped grooves (11) corresponding to the plurality of conical crushing rings (2) one by one, and a crushing groove (11) for crushing the old asphalt layer is formed between the conical crushing rings (2) and the conical stepped grooves (11). The crushing chamber (12) has a cavity height that gradually decreases from top to bottom. A material screening cavity (13) for automatically screening material crushed materials is formed between the outer wall of each conical crushing ring (2) and the inner wall of the crushing chamber (1). The screening material size of the material screening cavity (13) matches the crushing effect of the corresponding conical crushing ring (2). The screening material size of the material screening cavity (13) gradually decreases from top to bottom. A material inlet (14) is provided at the top of the crushing chamber (1), and a material outlet (15) is provided at the bottom of the crushing chamber (1); A discharge port (16) is provided on the crushing chamber (1) along the inclined direction of the surface of the conical crushing ring (2), and a plurality of discharge ports (16) are provided. The discharge ports (16) are located at the connection between the crushing chamber (12) and the material discharging screening chamber (13), and the plurality of discharge ports (16) correspond to the plurality of conical crushing rings (2) in a one-to-one manner. The size of the discharge ports (16) is consistent with the cavity height of the corresponding upper crushing chamber (12), and the size of the discharge ports (16) is larger than the size of the screening material of the material discharging screening chamber (13) of the layer; A material receiving channel (17) for receiving materials is connected to the discharge port (16) on the outer wall of the crushing chamber (1), and a plurality of material receiving channels (17) are provided. Each discharge port (16) on the crushing chamber (1) is connected to a corresponding material receiving channel (17), and the size of the material receiving channel (17) is consistent with the size of the corresponding discharge port (16); A return port (171) is provided at one end of the material receiving channel (17) close to the material discharging port (16). The return port (171) is arranged below the material discharging port (16). The screening size of the return port (171) and the material discharging screening chamber (13) at the corresponding position of the material discharging port (16) are consistent.

2. A foamed asphalt recovery system according to claim 1, characterized in that: The multi-stage crushing device also includes a screw conveyor (7), which is arranged obliquely on the side of the crushing chamber (1), the top end of the screw conveyor (7) is located above the feed inlet (14) of the crushing chamber (1), and the ends of the plurality of material receiving channels (17) away from the discharge port (16) are all connected to the lower half of the screw conveyor (7).

3. A foamed asphalt recovery system according to claim 2, characterized in that: A reentry channel (18) is also provided between the screw conveyor (7) and the crushing chamber (1). There are a plurality of reentry channels (18), the number of which is one less than the number of discharge ports (16). One end of the reentry channel (18) is located at the upper half of the screw conveyor (7), and the other end of the reentry channel (18) passes through the outer wall of the crushing chamber (1) and communicates with the crushing chamber (12) in the crushing chamber (1). The channel sizes of the plurality of reentry channels (18) decrease from top to bottom, and the channel size of the reentry channel (18) is consistent with the cavity height of the crushing cavity (12) at the connection between the reentry channel (18) and the crushing chamber (1).

4. A foamed asphalt recovery system according to claim 3, characterized in that: The connection between the material receiving channel (17) and the screw conveyor (7) is located at the upper half of the screw conveyor (7) along its inclined surface, and the connection between the reentry channel (18) and the screw conveyor (7) is located at the lower half of the screw conveyor (7) along its inclined surface.

5. The foamed asphalt recovery system according to claim 1, characterized in that: A first crushing tooth (21) and a second crushing tooth (19) are provided in the crushing chamber (12); the first crushing tooth (21) is located on the upper conical surface of the conical crushing ring (2) at a position corresponding to the crushing chamber (12); the first crushing tooth (21) is densely distributed in an annular manner on the conical crushing ring (2) along the axial direction of the rotating shaft (31); the second crushing tooth (19) is located on the conical step groove (11) at a corresponding position on the inner side wall of the crushing chamber (1); the second crushing tooth (19) is densely distributed in an annular manner on the step surface of the conical step groove (11) having the same inclination angle as the first crushing tooth (21) along the axial direction of the rotating shaft (31).

6. A foamed asphalt recovery system according to claim 1, characterized in that: A vertical section is provided at the top feed port (14) of the crushing chamber (1), a feed paddle (35) is provided in the vertical section, the outer wall of the feed paddle (35) is in contact with the inner wall of the vertical section, and the feed paddle (35) is fixedly connected to the top of the rotating shaft (31).

7. A method for recovering foamed asphalt, based on a foamed asphalt recovery system according to any one of claims 3 to 6, characterized in that: The following steps are included: S1: Scoop up the broken old asphalt layer and introduce it into the feed inlet (14) of the crushing chamber (1); S2: starting the multi-stage crushing device, the rotating shaft (31) rotates to drive a plurality of layers of conical crushing rings (2) to rotate inside the crushing chamber (1), and the conical crushing rings (2) and the inner wall of the crushing chamber (1) form a crushing chamber (12) for crushing the old asphalt layer and a material screening chamber (13) for screening the old asphalt layer; S3: The old asphalt layer is crushed in multiple stages in the crushing chamber (1). The qualified materials in each layer are sent to the lower layer, and the materials that fail to meet the requirements in each layer are blocked by the material screening chamber (13) and discharged through the discharge port (16) after rotating to a certain position. S4: The materials that do not meet the requirements are poured into the discharge channel after passing through the discharge port (16). After screening, the qualified materials that mistakenly enter the discharge channel are re-introduced into the lower crushing chamber (12) through the return port (171); S5: The material that does not meet the requirements is introduced into the screw conveyor (7) through the discharge channel, transported upward by the screw conveyor (7), and re-introduced into the crushing chamber (1) through the re-entry channel (18) or the inlet (14) of the crushing chamber (1); S6: The crushed material is discharged from the discharge port (15) of the crushing chamber (1), and is mixed with the foamed asphalt through the foamed asphalt mixing device, thereby realizing the recycling function of the old asphalt layer.

Images