Auxiliary feeding device and asphalt mixture mixing machine

Abstract

The utility model provides an auxiliary feeding device and an asphalt mixture mixer, and relates to the technical field of waste asphalt mixture regeneration stirring, the auxiliary feeding device comprises a lifting platform, a pressurizing mechanism and a conveying mechanism, the lifting platform is provided with a filling mechanism; the pressurizing mechanism comprises an air cylinder, an execution element and an air conveying pipe, the air conveying pipe communicates with the air cylinder and the filling mechanism, the execution element is connected with the lifting table, and air in the air cylinder is pressurized and conveyed into the filling structure through movement of the execution element; the conveying mechanism communicates with the filling mechanism. The device has the advantages of being simple in structure, convenient to operate and more uniform in regenerant dispersion, a power system does not need to be additionally arranged, and uniform spraying of the regenerant in the mixing process of the regenerated mixture can be achieved; the problem that the performance of the indoor regenerated mixture cannot accurately reflect the performance of the regenerated mixture in the mixing station due to the fact that the difference between the adding mode of the regenerant and the adding mode of the mixing station is too large in the indoor test is solved.

Description

Technical Field

[0001] This utility model relates to the field of waste asphalt mixture recycling and mixing technology, and in particular to an auxiliary feeding device and an asphalt mixture mixing machine. Background Technology

[0002] Asphalt is a complex, dark brown mixture composed of hydrocarbons of varying molecular weights and their non-metallic derivatives. It is widely used as a binder in asphalt pavement mixtures and has a significant impact on the performance of asphalt pavements. However, as an organic material, asphalt is prone to aging during use, leading to a decline in pavement performance and various pavement defects. This necessitates repair and maintenance of damaged pavements, generating a large amount of waste asphalt mixture. To achieve resource recycling, waste asphalt mixtures typically need to be regenerated to fully or partially restore their performance.

[0003] In the recycling process of waste asphalt mixtures, the most important step is to uniformly mix the waste asphalt mixture with the recycling agent to ensure that the recycling agent can restore the properties of the aged asphalt in the waste mixture. On-site recycling uses a mixing plant, while indoor recycling uses a small mixing machine. To ensure that the performance of the mixture mixed in the indoor test is similar to that of the mixture produced by the on-site mixing plant, the indoor test should be as close as possible to the on-site mixing conditions.

[0004] However, existing indoor asphalt mixing plants are designed for mixing virgin asphalt mixtures and do not take into account the need for adding recycling agents. This means that when preparing recycled asphalt mixtures using existing plants, it is usually necessary to stop the plant and manually add the recycling agent, a cumbersome process that increases labor and time costs. Stopping the plant to add the recycling agent interrupts the mixing process, affecting overall production efficiency, especially in large-scale continuous construction projects where such interruptions can significantly slow down project progress. Utility Model Content

[0005] In view of this, this utility model proposes an auxiliary feeding device and an asphalt mixture mixing machine, which can solve the problems of cumbersome and inefficient recycling process in traditional asphalt mixture mixing machines.

[0006] The technical solution of this utility model is implemented as follows:

[0007] This utility model provides an auxiliary feeding device for assembly on a mixer, comprising:

[0008] A lifting platform is provided with a filling mechanism, and the mixing mechanism of the mixer is provided on the lifting platform;

[0009] A pressurizing mechanism, comprising an air cylinder, an actuator, and an air supply pipe, wherein the air supply pipe connects the air cylinder and the packing mechanism, and the actuator is connected to the lifting platform; the movement of the actuator pressurizes the gas in the air cylinder and delivers it to the packing mechanism.

[0010] The conveying mechanism is connected to the filling mechanism.

[0011] Based on the above technical solutions, preferably, the conveying mechanism includes:

[0012] A conveying pipe, one end of which is connected to the packing mechanism, and the other end of which is connected to a sprayer; and

[0013] A switch is provided on the feed pipe.

[0014] More preferably, the sprayer has a material chamber inside, the material conveying pipe is connected to the material chamber, the sprayer has a spraying surface, and multiple spray nozzles are evenly spaced on the spraying surface.

[0015] More preferably, the sprayer has a feeding surface located above the spraying surface, and a feeding port is provided on the feeding surface, with the conveying pipe connected to the feeding port.

[0016] Based on the above technical solutions, preferably, the filling mechanism includes a material cylinder and a material cover, the material cylinder is disposed on the lifting platform, and the material cover is detachably connected to the inlet of the material cylinder.

[0017] This utility model also provides an asphalt mixture mixing plant, comprising:

[0018] A base, on which a stirring pot is provided, the jacket of which is filled with a heat-conducting medium;

[0019] A lifting drive mechanism is mounted on the base;

[0020] The aforementioned auxiliary feeding device, wherein the lifting platform of the auxiliary feeding device is connected to the lifting end of the lifting drive mechanism, and the air cylinder of the auxiliary feeding device is mounted on the base; and

[0021] A stirring mechanism is provided on the lifting platform and located above the stirring pot.

[0022] Based on the above technical solutions, preferably, the stirring mechanism includes a rotary driver, a stirring shaft, and stirring blades. The two ends of the stirring shaft are respectively connected to the rotary driver and the stirring blades. The stirring shaft also passes through the sprayer of the auxiliary feeding device, and the sprayer is located above the stirring blades.

[0023] More preferably, in a cross-section perpendicular to the axis of the stirring shaft, both the stirring blade and the sprayer are located within the inner diameter of the mixing pot, and the edges of the stirring blade and the sprayer are spaced apart from the inner diameter of the mixing pot.

[0024] Based on the above technical solutions, preferably, a buffer is provided between the mixing pot and the base.

[0025] Based on the above technical solutions, preferably, the base includes a first seat and a second seat connected to each other, the height of the first seat is greater than the height of the second seat, the lifting drive mechanism is disposed on the first seat, the second seat is provided with a receiving cavity, and the stirring pot is disposed in the receiving cavity.

[0026] The auxiliary feeding device and asphalt mixing plant of this invention have the following advantages over the prior art:

[0027] By connecting the actuator of the pressurizing mechanism to the lifting platform, the lifting platform can drive the stirring mechanism to the preset position and push the actuator to move for pressurization when it moves downward. Without the need for an additional power system, the regenerant can be sprayed evenly, which not only realizes the automatic addition of regenerant, but also saves energy and costs.

[0028] By using a sprayer, the regenerator can be added to the preheated mixture at any time without interrupting the mixing process. This method is closer to the addition method used in on-site mixing plants and does not affect the mixing time. This ensures that the performance of the recycled mixture prepared in the laboratory test can accurately reflect the performance of the recycled mixture produced in the on-site mixing plant, so as to better guide on-site applications and improve the quality of the recycled mixture. Attached Figure Description

[0029] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0030] Figure 1 This is a schematic diagram of the auxiliary feeding device of this utility model;

[0031] Figure 2 This is a schematic diagram of the sprayer in the auxiliary feeding device of this utility model.

[0032] Figure label:

[0033] 1. Lifting platform;

[0034] 2. Packing mechanism; 21. Material cylinder; 22. Material cover;

[0035] 3. Pressurization mechanism; 31. Air cylinder; 32. Actuating element; 33. Air supply pipe;

[0036] 4. Conveying mechanism; 41. Material conveying pipe; 42. Sprayer; 421. Spray nozzle; 422. Feed inlet; 43. Switching components;

[0037] 5. Base; 51. First base; 52. Second base;

[0038] 6. Stirring vessel; 61. Heat transfer medium;

[0039] 7. Buffer components; 8. Lifting drive mechanism;

[0040] 9. Stirring mechanism; 91. Rotary drive; 92. Stirring shaft; 93. Stirring blade. Detailed Implementation

[0041] The technical solutions of this utility model will be clearly and completely described below with reference to the embodiments of this utility model. Obviously, the described embodiments are only a part of the embodiments of this utility model, and not all of them. Based on the embodiments of this utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of this utility model.

[0042] like Figures 1 to 2 As shown, this utility model provides an auxiliary feeding device for mounting on a mixer. The auxiliary feeding device includes a lifting platform 1, a pressurizing mechanism 3, and a conveying mechanism 4. A filling mechanism 2 is mounted on the lifting platform 1, and the mixing mechanism 9 of the mixer is mounted on the lifting platform 1. The pressurizing mechanism 3 includes an air cylinder 31, an actuator 32, and an air supply pipe 33. The air supply pipe 33 connects the air cylinder 31 and the filling mechanism 2. The actuator 32 is connected to the lifting platform 1, and its movement pressurizes and delivers the gas in the air cylinder 31 to the filling mechanism 2. The conveying mechanism 4 is connected to the filling mechanism 2.

[0043] The filling mechanism 2 is equipped with materials for adding into the mixing plant. For ease of description, this embodiment takes the addition of a recycling agent to an asphalt mixture mixing plant as an example. Therefore, the material in the filling mechanism 2 is a recycling agent.

[0044] By connecting the actuator 32 of the pressurizing device to the lifting platform 1, the movement of the actuator 32 is driven by the lifting of the lifting platform 1, pressurizing the gas in the air cylinder 31 and delivering it to the filling mechanism 2. This provides conveying power for the feeding of the filling mechanism 2, avoiding conveying difficulties caused by viscous materials. Simultaneously, the mixing mechanism 9 of the mixer is mounted on the lifting platform 1. The lifting of the lifting platform 1 synchronously drives the movement of the mixing mechanism 9, moving it to a preset position for subsequent mixing operations. In summary, the auxiliary feeding device in this embodiment simultaneously drives the movement of the mixing mechanism 9 and the actuator 32 through the movement of the lifting platform 1. This allows the mixing mechanism 9 to be driven to a preset position while simultaneously providing conveying power to the filling mechanism 2. The material in the filling mechanism 2 is conveyed to the target position via the conveying mechanism 4 during the pressurization process. This achieves automated filling, reduces the use of equipment, and lowers costs.

[0045] The pressurization device includes an air cylinder 31, on which an actuator 32 is movably mounted. The movement of the actuator 32 pressurizes or draws in the gas within the air cylinder 31. The actuator 32 may include a piston rod or a plunger rod, etc.

[0046] Of course, a sealing element can also be provided between the actuator 32 and the air cylinder 31 to ensure the sealing effect and further ensure that no air leakage occurs between the actuator 32 and the air cylinder 31 during the movement of the actuator 32, thus ensuring stable pressure transmission from the pressurizing mechanism 3 to the packing mechanism 2.

[0047] In some embodiments, the conveying mechanism 4 includes a conveying pipe 41 and a switching element 43. One end of the conveying pipe 41 is connected to the filling mechanism 2, and the other end of the conveying pipe 41 is connected to a sprayer 42. The switching element 43 is disposed on the conveying pipe 41; the switching element 43 is used to control the connection and disconnection of the conveying pipe 41. This allows for control of the amount and method of regeneration addition, thereby meeting the usage requirements of different scenarios. Optionally, the switching element 43 may include a one-way valve, a rotary valve, or a solenoid valve, etc.

[0048] In some embodiments, the other end of the conveying pipe 41 is connected to a sprayer 42. The sprayer 42 allows the regenerant to be sprayed evenly, ensuring the dispersion effect of the regenerant and improving the mixing quality. The sprayer 42 can also reduce the process differences between the regenerant added by spraying during the mixing process on the production site and the regenerant added by spraying on the production site, ensuring that the properties of the regenerant mixture prepared in the laboratory test can relatively accurately reflect the properties of the regenerant mixture produced in the on-site mixing plant.

[0049] The sprayer 42 has a material chamber inside, and the material conveying pipe 41 is connected to the material chamber. The sprayer 42 has a spraying surface, and multiple spray nozzles 421 are evenly spaced on the spraying surface. The cavity is designed to store the regenerant inside the sprayer 42. The regenerant inside the cavity is sprayed out through the multiple spray nozzles 421, so that the regenerant can be sprayed evenly.

[0050] The sprayer 42 has a feeding surface located above the spraying surface, and a feeding port 422 is provided on the feeding surface. The conveying pipe 41 is connected to the feeding port 422. The material is fed from above the sprayer 42, and a spraying port 421 is provided at the bottom of the spraying agent to facilitate the flow of the regenerant into the sprayer 42. This ensures the spraying effect of the regenerant in the sprayer 42 and reduces the residue of the regenerant in the sprayer 42.

[0051] In some embodiments, the filling mechanism 2 includes a material cylinder 21 and a material cover 22. The material cylinder 21 is disposed on the lifting platform 1, and the material cover 22 is detachably connected to the inlet of the material cylinder 21. The material cylinder 21 can be detachably connected to the lifting platform 1 by means of bolts or clips, or the material cylinder 21 can be fixed to the lifting platform 1 by welding. The material cylinder 21 is used to store regenerant, and the inlet of the material cylinder 21 is closed by the material cover 22; the detachable connection between the material cover 22 and the material cylinder 21 facilitates the opening and closing of the material cover 22. The detachable connection between the material cover 22 and the material cylinder 21 includes threads or clips. In this embodiment, the material cover 22 is provided with internal threads, and the inlet of the material cylinder 21 is provided with external threads. The material cover 22 is detachably disposed on the material cylinder 21 through the screw engagement of the internal and external threads.

[0052] The material cylinder 21 is located above the lifting platform 1, and the pressurizing mechanism 3 is located below the lifting platform 1. This optimizes the spatial layout and allows operators to add regenerant at any time during equipment operation without interrupting the mixing process, thereby improving production efficiency.

[0053] In some embodiments, the strength of the gas supply pipe 33, the material cylinder 21, the material supply pipe 41, and the switch 43 is greater than the maximum working pressure of the equipment. This ensures that the gas supply pipe 33, the material cylinder 21, the material supply pipe 41, and the switch 43 will not be damaged under the maximum working pressure of the equipment, thus ensuring the service life of the device and improving the safety of the equipment.

[0054] Reference Figures 1 to 2As shown above, this application embodiment provides an auxiliary feeding device. When the lifting platform 1 moves downward, it can simultaneously push the actuator 32 to move for pressurization. The lower outlet of the air cylinder 31 is connected to the material cylinder 21 through the air supply pipe 33. The upper end of the material cylinder 21 is threadedly connected to the material cover 22, and the lower end is connected to the sprayer 42 through the material supply pipe 41. A switch 43 is provided on the material supply pipe 41.

[0055] The auxiliary feeding device connects the actuator 32 of the pressurizing mechanism 3 to the lifting platform 1. When the lifting platform 1 moves downward, it can drive the stirring mechanism 9 to the preset position and push the actuator 32 to move for pressurization. Without the need for an additional power system, it can achieve uniform spraying of the regenerant, thus realizing automatic addition of the regenerant and saving energy and costs.

[0056] like Figures 1 to 2 As shown, this utility model also provides an asphalt mixture mixing machine, including a base 5, a lifting drive mechanism 8, an auxiliary feeding device as described in the above embodiment, and a mixing mechanism 9. A mixing pot 6 is mounted on the base 5, and the jacket of the mixing pot 6 is filled with a heat-conducting medium 61. The lifting drive mechanism 8 is mounted on the base 5; the mixing mechanism 9 is mounted on the lifting platform 1 and located above the mixing pot 6.

[0057] The stirring pot 6 has a double-layer structure, with a heat-conducting medium 61 injected into the middle layer to heat and maintain the temperature inside the pot. Optionally, the heat-conducting medium 61 includes heat-conducting oil, silicone oil, or liquid metal, etc. In this embodiment, heat-conducting oil is used. The boiling point of the heat-conducting oil is lower than the operating temperature of the equipment, ensuring that the heat-conducting oil will not evaporate during the use of the equipment. Optionally, the boiling point of the heat-conducting oil is 50 degrees Celsius higher than the normal operating temperature of the equipment to further ensure safety.

[0058] The lifting drive mechanism 8 has its lifting end connected to the lifting platform 1, and is used to drive the lifting platform 1 to lift. The lifting drive mechanism 8 includes a cylinder, a hydraulic cylinder, or an electric push rod, etc. In this embodiment, the lifting drive mechanism 8 is a lifting cylinder, the piston rod of which is connected to the lifting platform 1, and the lifting cylinder is detachably mounted on the base 5 by bolts.

[0059] The base 5 includes a first seat 51 and a second seat 52 connected to each other. The height of the first seat 51 is greater than the height of the second seat 52. The cross-sectional shape of the base 5 is L-shaped. The lifting drive mechanism 8 is disposed on the first seat 51, and the second seat 52 is provided with a receiving cavity. The stirring pot 6 is disposed in the receiving cavity.

[0060] Optionally, a buffer 7 is provided between the mixing pot 6 and the base 5. The buffer 7 can effectively reduce vibration during the mixing process and improve the stability and service life of the equipment.

[0061] In some embodiments, the stirring mechanism 9 includes a rotary driver 91, a stirring shaft 92, and stirring blades 93. The two ends of the stirring shaft 92 are connected to the rotary driver 91 and the stirring blades 93, respectively. The stirring shaft 92 also passes through the sprayer 42 of the auxiliary feeding device, and the sprayer 42 is located above the stirring blades 93. The rotary driver 91 drives the stirring shaft 92 to rotate, and the stirring shaft 92 drives the stirring blades 93 to rotate synchronously, thereby mixing the materials in the mixing pot 6.

[0062] The rotary actuator 91 includes a rotary motor or a rotary cylinder, etc. In this embodiment, the rotary actuator 91 is a rotary motor, which is detachably mounted on the lifting platform 1 by bolts. The rotary actuator 91 is located above the lifting platform 1, the stirring shaft 92 passes through the lifting platform 1, and the stirring blades 93 are located below the lifting platform 1. The stirring blades 93 are spirally distributed, which can provide lateral and longitudinal stirring power during the stirring process, enhance the fluidity of asphalt in the mixing pot 6, and ensure that the asphalt and recycling agent are fully mixed, thereby improving the stirring effect.

[0063] Optionally, in a cross-section perpendicular to the axis of the stirring shaft 92, both the stirring blade 93 and the sprayer 42 are located within the inner diameter of the mixing pot 6, and the edges of both the stirring blade 93 and the sprayer 42 are spaced apart from the inner diameter of the mixing pot 6. When the lifting platform 1 descends to its lowest position, the distance between the lowest point of the stirring blade 93 and the inner bottom surface of the mixing pot 6 is within the range of 10-20mm, and the lateral width of the stirring blade 93 is 10-20cm smaller than the inner diameter of the mixing pot 6.

[0064] In operation, the designed waste asphalt mixture, new asphalt, and new aggregates are added to the mixing pot 6 for preheating. Simultaneously, switch 43 is turned off, and the material cover 22 is opened to add asphalt recycling agent into the material cylinder 21. The material cover 22 is then tightened. The mixer is then started, and the lifting drive mechanism 8 lowers the lifting platform 1 until the mixing blades 93 extend into the mixing pot 6. During this process, the descent of the lifting platform 1 also pressurizes the material cylinder 21. The rotation drive is then activated, which drives the mixing blades 93 to rotate via the mixing shaft 92. The mixing blades 93, driven by the mixing shaft 92, agitate the asphalt in the mixing pot 6.

[0065] According to the experimental design, the switch 43 is opened at a specified time, allowing the asphalt recycling agent in the material cylinder 21 to enter the sprayer 42 under pressure through the conveying pipe 41, and then be evenly sprayed onto the material in the mixing pot 6 from the spray nozzle 421. During this process, the mixing blades 93 do not need to be stopped and can continue to mix, ensuring that the added recycling agent is sprayed more evenly onto the material, achieving a more uniform mixing of the recycling agent and the material, resulting in better mixing efficiency, and is basically the same as the recycling agent spraying process in a mixing plant.

[0066] After mixing, the lifting platform 1 moves upward, opening the top of the mixing pot 6, allowing the mixed recycled asphalt mixture to be removed, molded, and subjected to performance testing. By improving the method of adding the recycling agent, the problem of inconvenient addition of the recycling agent in existing technologies is solved, resulting in advantages such as simple structure, convenient operation, and good mixing effect.

[0067] In summary, this asphalt mixture mixing plant has the advantages of simple structure, convenient operation, convenient addition of recycling agent and more uniform dispersion of recycling agent. In addition, it can achieve uniform spraying of recycling agent during the mixing process without the need for an additional power system. It also solves the problem that the performance of indoor recycled mixture cannot accurately reflect the performance of recycled mixture in the mixing plant due to the large difference between the recycling agent addition method and the addition method in the mixing plant.

[0068] The above description is only a preferred embodiment of the present utility model and is not intended to limit the present utility model. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present utility model should be included within the protection scope of the present utility model.

Claims

1. An auxiliary charging device for mounting on a mixer, characterized in that, include: A lifting platform (1) is provided with a filling mechanism (2), and the mixing mechanism (9) of the mixer is provided on the lifting platform (1); A pressurizing mechanism (3) includes an air cylinder (31), an actuator (32), and an air supply pipe (33). The air supply pipe (33) connects the air cylinder (31) and the filling mechanism (2). The actuator (32) is connected to the lifting platform (1). The movement of the actuator (32) pressurizes the gas in the air cylinder (31) and delivers it to the filling mechanism (2). The conveying mechanism (4) is connected to the filling mechanism (2).

2. The supplemental charging device of claim 1, wherein: The conveying mechanism (4) includes: A feed pipe (41), one end of which is connected to the packing mechanism (2), and the other end of which is connected to a sprayer (42); and A switch (43) is disposed on the feed pipe (41).

3. The supplemental charging device of claim 2, wherein: The sprayer (42) has a material chamber inside, the material conveying pipe (41) is connected to the material chamber, the sprayer (42) has a spraying surface, and a plurality of spraying nozzles (421) are evenly spaced on the spraying surface.

4. The supplemental charging device of claim 3, wherein: The sprayer (42) has a feeding surface located above the spraying surface, and a feeding port (422) is provided on the feeding surface. The conveying pipe (41) is connected to the feeding port (422).

5. The supplemental charging device of claim 1, wherein: The filling mechanism (2) includes a material cylinder (21) and a material cover (22). The material cylinder (21) is disposed on the lifting platform (1), and the material cover (22) is detachably connected to the inlet of the material cylinder (21).

6. An asphalt mixture pugmill characterized by: include: A base (5) is provided on which a stirring pot (6) is provided, and the jacket of the stirring pot (6) is filled with a heat-conducting medium (61). A lifting drive mechanism (8) is mounted on the base (5); The auxiliary feeding device as described in any one of claims 1 to 5, wherein the lifting platform (1) of the auxiliary feeding device is connected to the lifting end of the lifting drive mechanism (8), and the air cylinder (31) of the auxiliary feeding device is disposed on the base (5); and A stirring mechanism (9) is provided on the lifting platform (1) and located above the stirring pot (6).

7. The asphalt mixture pugmill of claim 6, wherein: The stirring mechanism (9) includes a rotary driver (91), a stirring shaft (92) and a stirring blade (93). The two ends of the stirring shaft (92) are connected to the rotary driver (91) and the stirring blade (93) respectively. The stirring shaft (92) also passes through the sprayer (42) of the auxiliary feeding device. The sprayer (42) is located above the stirring blade (93).

8. The asphalt mixture pugmill of claim 7, wherein: In a cross section perpendicular to the axis of the stirring shaft (92), both the stirring blade (93) and the sprayer (42) are located within the inner diameter of the mixing pot (6), and the edges of the stirring blade (93) and the sprayer (42) are spaced apart from the inner diameter of the mixing pot (6).

9. The asphalt mixture pugmill of claim 6, wherein, A buffer (7) is provided between the mixing pot (6) and the base (5).

10. The asphalt mixture pugmill of claim 6, wherein: The base (5) includes a first seat body (51) and a second seat body (52) connected to each other. The height of the first seat body (51) is greater than the height of the second seat body (52). The lifting drive mechanism (8) is disposed on the first seat body (51). The second seat body (52) is provided with a receiving cavity. The stirring pot (6) is disposed in the receiving cavity.

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