Recycled asphalt mixture stirring device
By using a thermally conductive stirring piece and a conical open structure in the stirring device, the old asphalt is preheated with the waste heat in the stirring chamber, and the auxiliary is fully mixed through the guide column and the moving pipe, the old asphalt is preheated in the prior art. The problems of low efficiency and uneven mixing improve the stirring effect of the asphalt mixture.
Patent Information
- Application Number
- CN202411515692.3
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2024-10-29
- Publication Date
- 2024-12-31
- Estimated Expiration
- Not applicable · inactive patent
AI Technical Summary
Existing mixers cannot effectively utilize the waste heat generated during the heating process, resulting in low preheating efficiency of old bitumen and affecting the mixing effect of the mixture.
A regenerated asphalt mixture stirring device is designed, using a thermally conductive stirring piece and a conical open structure, preheating the old asphalt with waste heat in the stirring chamber, and fully mixing the additives through the guide column and the moving pipe.
The preheating efficiency of old asphalt is improved, the mixing process between old asphalt and new asphalt is simplified, the full mixing of additives and asphalt is ensured, and the resource utilization and stirring effect are improved.
Smart Images
Figure CN119221349A_ABST
Abstract
Description
Technical Field
[0001] The invention relates to the field of regenerated asphalt mixing, and in particular to a regenerated asphalt mixture mixing device. Background Art
[0002] Asphalt is a black complex mixture composed of different hydrocarbons and their non-metallic derivatives. It is mainly divided into three types: coal tar asphalt, petroleum asphalt and natural asphalt. It is used in industries such as plastics, rubber, and road paving. Among them, the most common use of asphalt is for road paving.
[0003] At present, asphalt pavement is gradually brittle and aged due to the influence of traffic and various factors during use. In fact, it is the asphalt binder in the pavement material that has aged. Asphalt material is not a monomer, but a mixture composed of oil, colloid, asphaltene, etc. Because asphalt is a mixture, it can be added with a certain component in a simple way, or it can be remixed with new asphalt materials to make a new asphalt mixture that shows new technical properties again. In the petroleum industry, there is a process method of mixing hard asphalt and soft asphalt in a certain proportion to form blended asphalt. The regeneration of old asphalt materials is to obtain recycled asphalt based on the principle of producing blended asphalt. Therefore, in order to improve the utilization efficiency of asphalt and the recycling of asphalt pavement, the old asphalt shaved from the old asphalt pavement is usually mixed with new asphalt and stirred, and then regeneration agents, mineral powder, etc. can be added for use; Before mixing old asphalt with new asphalt, the asphalt needs to be heated. In particular, after long-term use, the viscosity of the old asphalt will increase significantly, and preheating is needed to reduce its viscosity, making it easier to mix and handle. Therefore, the old asphalt needs to be preheated before heating. Because the temperature required for preheating the old asphalt is lower than the heating temperature of the new asphalt, the preheating of the old asphalt and the heating of the new asphalt are usually carried out separately. Even if the existing mixer has a heating function, it can only heat the old asphalt or the new asphalt alone. The existing mixer cannot effectively utilize the waste heat generated during the heating process. Summary of the invention
[0004] The purpose of the present invention is to provide a regenerated asphalt mixture stirring device to solve the problem that the existing mixer cannot effectively utilize the waste heat generated during the heating process. The specific technical solution is as follows: A recycled asphalt mixture stirring device comprises a stirring drum, wherein a preheating chamber and a stirring chamber arranged in a longitudinal direction are arranged inside the stirring drum, wherein the bottom surface of the preheating chamber is provided with a conical opening which gradually shrinks toward the center of the bottom surface, wherein the preheating chamber is connected to the stirring chamber through the conical opening, and further comprises a heat-conducting stirring member, wherein the heat-conducting stirring member comprises a first stirring rod, a platform and a second stirring rod, wherein the platform is arranged in the outlet of the conical opening, wherein the first stirring rod and the second stirring rod are respectively vertically connected to the top surface and the bottom surface of the platform, wherein the middle of the top surface of the platform is raised and the top of the platform forms a cone shape, and further comprises a driving mechanism and a lifting mechanism, wherein the driving mechanism is connected to the heat-conducting stirring member to drive the heat-conducting stirring member to rotate, and the lifting mechanism is used to drive the driving mechanism to perform longitudinal reciprocating motion.
[0005] Preferably, it also includes a feed pipe, which passes through the mixing drum and extends into the mixing chamber.
[0006] Preferably, the feed pipe includes a movable pipe and a fixed pipe, the fixed pipe is fixed on the mixing drum, and the inlet of the fixed pipe is arranged outside the mixing drum, and the outlet of the fixed pipe is arranged in the mixing chamber, the inner wall of the mixing chamber is connected with a guide column, the movable pipe is slidably connected to the guide column, and the guide column is configured to have a predetermined position, and when the movable tube slides to the predetermined position, the movable tube is connected to the fixed tube.
[0007] Preferably, the movable tube comprises a vertical section and an inclined section connected to each other, the angle between the vertical section and the inclined section is an obtuse angle, the inclined section is arranged toward the center of the mixing drum, and the inclined section is arranged on the rotation path of the second mixing rod.
[0008] Preferably, a first channel which gradually contracts from top to bottom is provided inside the vertical section, and a second channel is provided inside the inclined section, and the first channel is communicated with the second channel.
[0009] Preferably, it further comprises a return spring, wherein the return spring is sleeved on the guide column, and the return spring is arranged between the inner wall of the mixing chamber and the movable tube.
[0010] Preferably, the rear surface of the vertical section protrudes backward to form a raised portion, and when the movable tube is not in a predetermined position, the raised portion covers the fixed tube.
[0011] Preferably, it also includes a sensing switch and a valve, the sensing switch is connected to the valve signal, the valve is installed on the fixed tube, and the sensing switch is arranged on the sliding path of the movable tube. When the movable tube slides to a predetermined position, the movable tube triggers the sensing switch to open the valve.
[0012] Preferably, the center of the bottom surface of the mixing chamber bulges upward to form a cone shape.
[0013] Preferably, a heating device is also included, and the heating device is connected to the stirring chamber.
[0014] Beneficial effects of the present invention: 1. The waste heat in the mixing chamber can be utilized by using the heat-conducting stirring element, thereby preheating the old asphalt in the preheating chamber and improving resource utilization; 2. By setting a conical opening, the old asphalt can directly enter the mixing chamber through the conical opening after preheating, so as to be easily mixed with the new asphalt; 3. The old asphalt loaded into the silo will be concentrated between the conical opening and the top protrusion of the platform. Since the first stirring rod is arranged at the top edge of the platform, that is, the first stirring rod is also between the conical opening and the top protrusion of the platform, the old asphalt can be effectively stirred by driving the first stirring rod to rotate. 4. The movable tube sliding along the guide column can spread the additive to a wider range, which is conducive to the full mixing of the additive with the old asphalt and the new asphalt.
[0015] Additional aspects and advantages of the present invention will be given in part in the description below, and in part will become apparent from the description below, or will be understood through the practice of the present invention. Of course, it is not necessary to achieve all of the advantages described above at the same time to implement any product or method of the present application. BRIEF DESCRIPTION OF THE DRAWINGS
[0016] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative labor.
[0017] Figure 1 It is a structural schematic diagram of the present invention.
[0018] Figure 2 It is a schematic structural diagram of the heat-conducting stirring element of the present invention.
[0019] Figure 3 It is a structural schematic diagram of a feed pipe of the present invention.
[0020] Figure 4 It is a structural schematic diagram of the movable tube of the present invention.
[0021] Figure 5 It is another structural schematic diagram of the movable tube of the present invention.
[0022] Figure 6It is a schematic structural diagram of a mixing drum of the present invention.
[0023] In the figure: 1. mixing drum; 2. heat-conducting stirring element; 3. driving mechanism; 4. lifting mechanism; 5. feeding pipe; 6. guide column; 7. reset spring; 8. induction switch; 9. guide plate; 10. valve; 11. preheating chamber; 12. mixing chamber; 111. conical opening; 21. first stirring rod; 22. platform; 23. second stirring rod; 51. movable tube; 52. fixed tube; 511. vertical section; 512. inclined section; 5111. first channel; 5121. second channel. DETAILED DESCRIPTION
[0024] The technical solutions in the embodiments of the present invention are described clearly and completely below. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of them. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.
[0025] Reference to "embodiments" herein means that a particular feature, structure, or characteristic described in conjunction with the embodiments may be included in at least one embodiment of the present application. The appearance of the phrase in various locations in the specification does not necessarily refer to the same embodiment, nor is it an independent or alternative embodiment that is mutually exclusive with other embodiments. It is explicitly and implicitly understood by those skilled in the art that the embodiments described herein may be combined with other embodiments.
[0026] Based on the problem that the existing mixer cannot effectively utilize the waste heat generated during the heating process, please refer to the figure. The present invention provides an embodiment to solve the above problem, specifically including a mixing drum 1, wherein the mixing drum 1 is provided with a preheating bin 11 and a mixing bin 12 arranged in a longitudinal direction, wherein the preheating bin 11 is used to place old asphalt, and the mixing bin 12 is used to place new asphalt and to mix the old asphalt with the new asphalt later; This embodiment is mainly for heating the mixing bin 12, so a heating device connected to the mixing bin 12 is also provided. Specifically, a hot oil heating system is provided inside the mixing drum 1, that is, a plurality of oil pipes 12 are arranged around the mixing bin 12 to heat the mixing bin 12. The bottom surface of the preheating bin 11 is provided with a conical opening 111 which gradually shrinks toward the center of the bottom surface thereof. The preheating bin 11 is connected to the mixing bin 12 through the conical opening 111. By providing the conical opening 111, after the old asphalt is preheated, it can directly enter the mixing bin 12 through the conical opening 111, so as to be convenient for mixing with the new asphalt. Preferably, a heat-conducting stirring member 2 is further included, and the heat-conducting stirring member 2 includes a first stirring rod 21, a platform 22, and a second stirring rod 23. The platform 22 is arranged in the outlet of the conical opening 111, and the first stirring rod 21 and the second stirring rod 23 are respectively vertically connected to the top surface and the bottom surface of the platform 22, that is, the first stirring rod 21 extends into the preheating bin 11, and the second stirring rod 23 extends into the stirring bin 12. When the heating device heats the stirring bin 12, the heat-conducting stirring member 2 can be used to utilize the residual heat in the stirring bin 12, thereby realizing preheating of the old asphalt in the preheating bin 11. The material of the heat-conducting stirring member 2 can be one or more of copper and aluminum; The mixing drum 1 is also provided with a driving mechanism 3 and a lifting mechanism 4, wherein the driving mechanism 3 is used to drive the heat-conducting stirring member 2 to rotate, and the lifting mechanism 4 is used to drive the heat-conducting stirring member 2 and the driving mechanism 3 to move in the vertical direction. Specifically, the driving mechanism 3 includes a motor, the rotating shaft of the motor is connected to a turntable, and the first stirring rod 21 is connected to the turntable, and the turntable is driven by the motor to drive the first stirring rod 21, the platform 22 and the second stirring rod 23 to rotate; The purpose of setting the lifting mechanism 4 is to push the platform 22 away from the tapered opening 111, thereby opening the tapered opening 111, so that the old asphalt in the feed bin can enter the mixing bin 12 or the new asphalt can be loaded into the mixing bin 12. Specifically, the lifting mechanism 4 includes a guide rail vertically arranged on the top surface of the mixing drum 1, and a slider slidably matched with the guide rail is connected to the guide rail, and the driving mechanism 3 is installed on the slider. By driving the slider to rise or fall along the guide rail, the driving mechanism 3 and the heat-conducting stirring member 2 can be driven to perform lifting and lowering movements; Although the conical opening 111 can be opened by the lifting mechanism 4, if the platform 22 is in a plane, part of the old asphalt that has fallen on the platform 22 will still remain on the platform 22 after the conical opening 111 is opened. Therefore, it is necessary to improve the platform 22. Preferably, the middle of the top surface of the platform 22 is convex and the top of the platform 22 is formed into a cone. The conical design will make the old asphalt that has fallen on the top surface of the platform 22 automatically fall along the side of the platform 22. In addition, when the platform 22 is arranged in the conical opening 111, a shape that narrows toward the middle on all sides at the bottom of the feed bin and convexes upward in the middle of the bottom of the feed bin will be formed. The old asphalt loaded into the feed bin will be concentrated between the conical opening 111 and the top surface convexity of the platform 22. Because the first stirring rod 21 is arranged at the edge of the top surface of the platform 22, that is, the first stirring rod 21 is also between the conical opening 111 and the top surface convexity of the platform 22, at this time, the first stirring rod 21 is driven to rotate, so that the old asphalt can be effectively stirred. In the present embodiment, when the platform 22 is in the conical opening 111, specifically, when the platform 22 is in the exit of the minimum radius of the conical opening 111, it is the highest position at which the lifting mechanism 4 drives the platform 22 to rise. If the conical opening 111 is to be opened, the lifting mechanism 4 needs to drive the platform 22 to descend into the mixing chamber 12. It can be understood that although the conical opening 111 can be opened by driving the lifting mechanism 4 to rise the platform 22 in the conical opening 111, the efficiency of the old asphalt falling on the platform 22 solely by its own gravity is poor. If the lifting mechanism 4 drives the platform 22 to descend from the conical opening 111, the old asphalt falling from the conical opening 111 will impact the old asphalt on the platform 22, accelerating the falling of the old asphalt on the platform 22. Secondly, when the platform 22 enters the mixing chamber 12, the internal temperature of the mixing chamber 12 is relatively high, which makes the old asphalt flow better and is also conducive to the old asphalt falling into the mixing chamber 12 faster.
[0027] In the process of old asphalt and new asphalt being collected in the mixing bin 12 and then mixed, it is necessary to add corresponding regeneration agent into the mixing bin 12. If the conical opening 111 is opened again, heat loss will occur. Therefore, it is necessary to set a feed pipe 5 specifically for adding additives. Specifically, the feed pipe 5 passes through the mixing drum 1 and extends into the mixing bin 12.
[0028] Although there are also existing technologies that add pipes to the mixing drum 1 to facilitate the addition of additives, the position of such pipes is relatively fixed, and the additives will only fall on a single position after entering the mixing drum 1, which is not conducive to the full mixing of the additives with the old asphalt and the new asphalt. Therefore, the present invention also provides an embodiment to solve this problem. Specifically, the feed pipe 5 includes a movable pipe 51 and a fixed pipe 52. The fixed pipe 52 is fixed on the mixing drum 1, and the inlet of the fixed pipe 52 is arranged outside the mixing drum 1, and the outlet of the fixed pipe 52 is arranged in the mixing chamber 12. The inner wall of the mixing chamber 12 is connected to the movable pipe 51 and the fixed pipe 52 is fixed to the mixing drum 1. There is a guide column 6, and the movable tube 51 is slidably connected to the guide column 6. The guide column 6 is configured to have a predetermined position. When the movable tube 51 slides to the predetermined position, the movable tube 51 is connected to the fixed tube 52. It can be understood that the additive enters along the inlet of the fixed tube 52 and then flows out from the outlet of the fixed tube 52. When the movable tube 51 reaches the predetermined position, the additive flowing out from the outlet of the fixed tube 52 will enter the movable tube 51. The movable tube 51 sliding along the guide column 6 can splash the additive to a larger range, which is conducive to fully mixing the additive with the old asphalt and the new asphalt. On the basis of the above embodiment, the movable tube 51 can be driven by the rotating second stirring rod 23. Specifically, the movable tube 51 includes a vertical section 511 and an inclined section 512 connected to each other. The angle between the vertical section 511 and the inclined section 512 is an obtuse angle. The inclined section 512 is arranged toward the center of the mixing drum 1, and the inclined section 512 is arranged on the rotation path of the second stirring rod 23, that is, when the second stirring rod 23 rotates to a certain position, the second stirring rod 23 will push the movable tube 51 to move along the guide column 6. Further, after being pushed by the second stirring rod 23, the movable tube 51 needs to be reset. Therefore, a corresponding reset mechanism needs to be set, for example, a reset spring 7. The reset spring 7 can be sleeved on the guide column 6, and the reset spring 7 is arranged between the inner wall of the mixing chamber 12 and the movable tube 51. The reset spring 7 can be used to return the movable tube 51 to its initial position. If the flow rate of the auxiliary agent flowing out of the movable tube 51 is too fast, the auxiliary agent may flow out of the movable tube 51 before the movable tube 51 slides. Therefore, the present invention also provides an embodiment, specifically, a first channel 5111 is provided inside the vertical section 511 and gradually shrinks from top to bottom, and a second channel 5121 is provided inside the inclined section 512. The first channel 5111 is connected to the second channel 5121. By designing the gradually shrinking first channel 5111, the speed at which the auxiliary agent flows out of the movable tube 51 can be appropriately reduced.
[0029] Based on the fact that the movable tube 51 can slide along the guide column 6, a pipeline control switch can be provided for the fixed tube 52 to prevent the additive from flowing out of the fixed tube 52 and causing waste when the movable tube 51 does not reach the predetermined position. Specifically, the rear surface of the vertical section 511 bulges backward to form a bulge. When the movable tube 51 is not in the predetermined position, the bulge covers the fixed tube 52. Furthermore, the sensor switch 8 and the valve 10 are connected by signal. The sensor switch 8 and the valve 10 can be wirelessly connected. Communication connection or wired connection, and the valve 10 is installed on the fixed tube 52, and the induction switch 8 is set on the sliding path of the movable tube 51. When the movable tube 51 slides to a predetermined position, the movable tube 51 triggers the induction switch 8 to open the valve 10, that is, when the movable tube 51 does not reach the predetermined position, the induction switch 8 is not triggered, so the valve 10 is closed, and the auxiliary agent in the fixed tube 52 cannot flow out. When the movable tube 51 reaches the predetermined position, the valve 10 is opened, and the auxiliary agent in the fixed tube 52 flows out and enters the movable tube 51. Preferably, two guide plates 9 are arranged opposite to each other on both sides of the top surface of the movable tube 51, and the fixed tube 52 is arranged between the two guide plates 9. The cooperation between the fixed tube 52 and the guide plate 9 combined with the guide column 6 can ensure that the movable tube 51 slides on the correct sliding path to avoid its deviation. Secondly, when the movable tube 51 leaves from the predetermined position, the auxiliary agent that may overflow from the fixed tube 52 or the movable tube 51 will remain between the two guide plates 9. When the movable tube 51 slides and approaches or moves away from the fixed tube 52, the retained auxiliary agent will be pushed by the fixed tube 52 into the mixing chamber 12 or the movable tube 51.
[0030] Taking into account that the lifting mechanism 4 will drive the platform 22 to descend from the conical opening 111, and the descent of the platform 22 will also drive the second stirring rod 23 to descend, the bottom surface of the mixing chamber 12 can be further optimized, that is, the center of the bottom surface of the mixing chamber 12 bulges upward to form a cone shape. By forming the above-mentioned cone-shaped bulge, the old asphalt and the new asphalt can be gathered to the side of the bottom surface of the mixing chamber 12. Because the second stirring rod 23 is connected to the side of the bottom surface of the platform 22, the second stirring rod 23 can effectively stir the old asphalt and the new asphalt.
[0031] In some embodiments, an openable door is provided on the side of the mixing chamber 12 to facilitate the delivery of the mixed asphalt mixture. During this process, the asphalt mixture can also be pushed to the vicinity of the door by rotating the second stirring rod 23.
[0032] It should be noted that the terms "first", "second", etc. in this document are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" or "second" may explicitly or implicitly include one or more of the features.
[0033] It will be apparent to those skilled in the art that the present invention is not limited to the details of the exemplary embodiments described above and that the present invention can be implemented in other specific forms without departing from the spirit or essential features of the present invention. Therefore, the embodiments should be considered exemplary and non-restrictive in all respects, and the scope of the present invention is defined by the appended claims rather than the above description, and it is intended that all changes falling within the meaning and scope of the equivalent elements of the claims be included in the present invention.
Claims
1. A regenerated asphalt mixture stirring device, characterized in that: The invention comprises a mixing drum, wherein a preheating chamber and a mixing chamber are arranged longitudinally inside the mixing drum, the bottom surface of the preheating chamber is provided with a conical opening which gradually shrinks toward the center of the bottom surface, the preheating chamber is connected to the mixing chamber through the conical opening, and further comprises a heat-conducting stirring member, the heat-conducting stirring member comprises a first stirring rod, a platform and a second stirring rod, the platform is arranged in the outlet of the conical opening, the first stirring rod and the second stirring rod are respectively vertically connected to the top surface and the bottom surface of the platform, the middle of the top surface of the platform is convex so that the top of the platform forms a cone shape, and further comprises a driving mechanism and a lifting mechanism, the driving mechanism is connected to the heat-conducting stirring member to drive the heat-conducting stirring member to rotate, and the lifting mechanism is used to drive the driving mechanism to make longitudinal reciprocating motion.
2. A regenerated asphalt mixture stirring device according to claim 1, characterized in that: It also includes a feed pipe, which passes through the mixing drum and extends into the mixing bin.
3. A regenerated asphalt mixture stirring device according to claim 2, characterized in that: The feed pipe includes a movable pipe and a fixed pipe, the fixed pipe is fixed on the mixing drum, and the inlet of the fixed pipe is arranged outside the mixing drum, and the outlet of the fixed pipe is arranged in the mixing chamber, the inner wall of the mixing chamber is connected with a guide column, the movable pipe is slidably connected to the guide column, and the guide column is configured to have a predetermined position. When the movable pipe slides to the predetermined position, the movable pipe is connected to the fixed pipe.
4. A regenerated asphalt mixture stirring device according to claim 3, characterized in that: The movable tube includes a vertical section and an inclined section connected to each other, the included angle between the vertical section and the inclined section is an obtuse angle, the inclined section is arranged toward the center of the mixing drum, and the inclined section is arranged on the rotation path of the second mixing rod.
5. A regenerated asphalt mixture stirring device according to claim 4, characterized in that: A first channel which gradually contracts from top to bottom is provided inside the vertical section, and a second channel is provided inside the inclined section, and the first channel is communicated with the second channel.
6. The regenerated asphalt mixture stirring device according to claim 3, characterized in that: It also includes a return spring, which is sleeved on the guide column and arranged between the inner wall of the stirring bin and the movable tube.
7. A regenerated asphalt mixture stirring device according to claim 4, characterized in that: The rear surface of the vertical section protrudes backward to form a protrusion, and when the movable tube is not in a predetermined position, the protrusion covers the fixed tube.
8. The regenerated asphalt mixture stirring device according to claim 7, characterized in that: It also includes a sensing switch and a valve, wherein the sensing switch is connected to the valve signal, the valve is installed on the fixed tube, and the sensing switch is arranged on the sliding path of the movable tube. When the movable tube slides to a predetermined position, the movable tube triggers the sensing switch to open the valve.
9. The regenerated asphalt mixture stirring device according to claim 1, characterized in that: The center of the bottom surface of the mixing bin bulges upward to form a cone shape.
10. The regenerated asphalt mixture stirring device according to claim 1, characterized in that: It also includes a heating device, which is connected to the stirring bin.