An asphalt stripping device and method for recycled asphalt mixtures

Abstract

This invention proposes an asphalt stripping device and method for recycled asphalt mixtures, belonging to the field of recycled asphalt mixtures. The device features an axially rotating inner shell with a gap between its outer and inner peripheral walls. A window is provided on the outer peripheral wall of the inner shell. A first scraper and a second scraper are positioned within the gap and on the outer and inner peripheral walls of the inner and outer shells, respectively. The first scraper drives the mixture to rotate synchronously with the inner shell, causing the second scraper to scrape the surface of the mixture. A vibrating plate is positioned within the window and vibrates along the direction of the window, reducing the width of the gap. The vibration of the vibrating plate on the inner shell accelerates the rolling speed of small particles, separating them from larger particles. Simultaneously, the vibration raises the surface of the vibrating plate above the surface of the inner shell, reducing the gap width. This reduced gap hinders the movement speed of large particles within the gap, prolonging their residence time, allowing the second scraper to scrape the surface of the large particles, resulting in asphalt stripping.

Description

Technical Field

[0001] This invention relates to the field of asphalt recycling technology, and more particularly to an asphalt stripping device and method for asphalt recycling. Background Technology

[0002] When asphalt pavements are renovated or maintained, the original pavement is removed, generating a large amount of recycled asphalt pavement (RAP). This recycled material can be reused on new pavements, reducing environmental pollution and the consumption of large amounts of asphalt, aggregate, and other raw materials, thus saving on project investment. It is an important method for the sustainable development of existing highway transportation. This technology is also known as asphalt pavement recycling. In this process, the recycled asphalt pavement is stripped from the aggregate using a stripping device, screened, and then mixed in a specific ratio with new aggregate (aggregate) and new asphalt materials. The mixture is then reheated and stirred to form a recycled asphalt mixture that meets performance requirements. This mixture is then re-laid and compacted to form a new pavement.

[0003] Existing processing methods involve biaxial stripping. For example, Chinese patent CN110882760A discloses a device for stripping asphalt and aggregate from old asphalt mix. This device uses two independently driven toothed rollers, where the material is purely subjected to compression, tearing, and stripping within the crushing chamber. However, this equipment strips in a linear fashion, meaning that the waste asphalt mixture is only stripped when it enters the intersection between the two toothed rollers. This results in low stripping efficiency and poor performance. Furthermore, the finished product not only lacks sufficient asphalt stripping but also makes it difficult to prevent the formation of large-diameter pseudo-particles from the agglomeration of small stones and asphalt. Summary of the Invention

[0004] In view of this, the present invention proposes an asphalt stripping device and asphalt stripping method for recycled asphalt mixtures, which solves the problem that in existing equipment, the waste asphalt mixture is only stripped when it enters the intersection between the two toothed rollers, resulting in insufficient stripping of asphalt on the finished product and making it difficult to avoid the formation of large-diameter pseudo particles by multiple small-sized stones and asphalt clumps.

[0005] The technical solution of this invention is implemented as follows: This invention provides an asphalt stripping device for recycled asphalt mixtures, including an inner shell, an outer shell, a first scraper, a second scraper, and a vibrating plate; the inner shell is fitted inside the outer shell and rotates axially relative to the outer shell in a direction perpendicular to the horizontal plane, with a gap between the outer peripheral wall of the inner shell and the inner peripheral wall of the outer shell, through which the mixture passes, and a window is provided on the outer peripheral wall of the inner shell; the first scraper and the second scraper are both disposed within the gap and respectively disposed on the outer peripheral wall of the inner shell and the inner peripheral wall of the outer shell, the first scraper driving the mixture to rotate synchronously with the inner shell, causing the second scraper to scrape the surface of the mixture; the vibrating plate is disposed within the window and vibrates along the direction of the window, and reduces the width of the gap.

[0006] Based on the above technical solution, preferably, it also includes a first elastic element; slots are provided at both ends of the inner wall of the window along the flow direction of the mixture; flanges are provided at both ends of the vibrating plate along the flow direction of the mixture, and the flanges are inserted into the slots one by one; the first elastic element is disposed between the side of the flange facing the outer shell and the inner wall of the slot, the first elastic element abuts against the surface of the flange facing the outer shell and the inner wall of the slot, and the vibrating plate vibrates and compresses the first elastic element.

[0007] More preferably, it also includes a motor and a rocker arm; the motor is disposed on the inner wall of the inner housing and near the edge of the window; the middle part of the rocker arm is connected to the output shaft of the motor, and the two ends of the rocker arm extend to the two ends of the vibrating plate away from the outer housing, respectively. The two ends of the rocker arm swing back and forth around the middle part under the drive of the motor, so that the two ends of the rocker arm alternately strike the two ends of the vibrating plate away from the outer housing, drive the vibrating plate to vibrate and make the two ends of the vibrating plate alternately squeeze the first elastic element located at the two ends of the vibrating plate, and reduce the distance between the surface of the vibrating plate facing the outer housing and the inner wall of the outer housing, thereby reducing the width of the gap.

[0008] More preferably, when the first elastic element is in a relaxed state, the surface of the vibrating plate facing the outer shell is flush with the outer peripheral wall of the inner shell.

[0009] Based on the above technical solutions, preferably, both the inner shell and the outer shell are conical, and the top of the outer shell has a feed inlet.

[0010] More preferably, the device also includes a main body and a bracket; an inner shell and an outer shell are provided on the main body; the bracket is provided on the main body, and the outer shell is provided on the bracket and fixedly connected to the bottom of the outer shell.

[0011] More preferably, it also includes a second elastic element, which is disposed between the bracket and the device body and its two ends are respectively connected to the bracket and the device body. The bracket drives the outer shell to move in the vertical direction of the horizontal plane and increases the width of the gap, and causes the second elastic element to stretch elastically.

[0012] More preferably, the extension direction of the first scraper intersects the conical generatrix direction of the inner shell, and the extension direction of the second scraper intersects the conical generatrix direction of the outer shell, with the extension directions of the first scraper and the second scraper intersecting.

[0013] On the other hand, the present invention also provides a method for asphalt stripping of recycled asphalt mixtures, using the asphalt stripping device described above, comprising the following steps: Step 1, feeding the mixture into the inlet and allowing it to flow through the gap; Step 2, rotating the inner shell axially relative to the outer shell, with the first scraper driving the mixture passing through the gap to rotate synchronously with the inner shell, and the second scraper scraping the surface of the mixture to strip the asphalt from the surface of the mixture; Step 3, during the process of the mixture passing through the gap, the vibrating plate vibrates and accelerates the speed of smaller particles passing through the gap, and the vibrating plate vibrates and narrows the width of the gap, hindering the speed of larger particles passing through the gap and prolonging the time that larger particles are scraped by the second scraper.

[0014] Based on the above technical solutions, the preferred method further includes step four, in which when larger particles are stuck in the gap, the moving bracket increases the width of the gap and causes the larger particles to disengage from the gap, and the second elastic element is stretched.

[0015] The asphalt stripping device and method for recycled asphalt mixtures of the present invention have the following advantages over the prior art:

[0016] (1) The present invention provides a vibrating plate on the inner shell. The vibration of the vibrating plate can accelerate the rolling speed of small particles and separate them from large particles. At the same time, when the vibrating plate vibrates, its surface will be higher than the surface of the inner shell and the gap width will be reduced. The reduction of the gap will hinder the movement speed of large particles in the gap and prolong the residence time, so that the second scraper can fully scrape the surface of large particles and peel off the asphalt on its surface, which greatly improves the asphalt peeling effect and can also peel off and separate the pseudo particles.

[0017] (2) The present invention provides an outer shell on the bracket. By moving the outer shell up and down, the gap between the inner and outer shells is increased, thereby allowing large particles stuck in the gap to be released from the gap, thus solving the problem of large particles getting stuck in the gap and blocking the gap. Attached Figure Description

[0018] To more clearly illustrate the technical solutions in the embodiments of the present invention 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 the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0019] Figure 1This is a perspective view of the asphalt stripping device of the present invention;

[0020] Figure 2 This is an exploded perspective view of the asphalt stripping device of the present invention;

[0021] Figure 3 This is a side sectional view of the asphalt stripping device of the present invention;

[0022] Figure 4 This is a bottom view of the outer casing of the present invention;

[0023] Figure 5 This is a partial side sectional view of the gap in the present invention;

[0024] Figure 6 This is a partial side sectional view of another state of the gap in the present invention;

[0025] Figure 7 For the present invention Figure 6 Enlarged view of point A in the middle.

[0026] In the figure: 1. Inner shell; 101. Gap; 102. Window; 103. Slot; 2. Outer shell; 3. First scraper; 4. Second scraper; 5. Vibrating plate; 51. Flange; 6. First elastic element; 7. Motor; 8. Rocker arm; 9. Main body of the device; 10. Bracket; 11. Second elastic element. Detailed Implementation

[0027] The technical solutions of the present invention will be clearly and completely described below with reference to the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the scope of protection of the present invention.

[0028] like Figure 1 As shown, combined with Figure 3 and Figure 5 The present invention provides an asphalt stripping device for recycled asphalt mixture, comprising an inner shell 1, an outer shell 2, a first scraper 3, a second scraper 4, and a vibrating plate 5.

[0029] The inner shell 1 is fitted inside the outer shell 2 and rotates axially relative to the outer shell 2 in the vertical direction around the horizontal plane. A gap 101 is left between the outer peripheral wall of the inner shell 1 and the inner peripheral wall of the outer shell 2, and the mixture passes through the gap 101.

[0030] Both the first scraper 3 and the second scraper 4 are set in the gap 101 and are respectively set on the outer peripheral wall of the inner shell 1 and the inner peripheral wall of the outer shell 2. The first scraper 3 drives the mixture to rotate synchronously with the inner shell 1, so that the second scraper 4 scrapes the surface of the mixture.

[0031] After the mixture falls into the gap 101 from above, it moves downward under its own weight. The outer shell 2 remains stationary, while the inner shell 1 rotates relative to the outer shell 2, causing several first scrapers 3 arranged around the outer periphery of the inner shell 1 to continuously pass over the second scrapers 4 as the inner shell 1 rotates. When the mixture passes through the space between two first scrapers 3 in the gap 101, the second scrapers 4 scrape the surface of the mixture and peel off the asphalt. As the inner shell 1 continues to rotate, the mixture in the space between the two first scrapers 3 rolls laterally within that space, so that its entire surface is scraped by the second scrapers 4. Similarly, when the mixture passes through the space between two second scrapers 4, it is also scraped and peeled off by the first scrapers 3.

[0032] Although the above process can peel asphalt from the aggregate particles, the peeled asphalt forms numerous small particles. Since these small particles have the same falling acceleration as the large particles, they fill the gaps between each other. As the peeling device progresses, the large number of particles and their complex size gradients cause the gaps to become completely filled, hindering the rolling of the particles between the scrapers. This makes it difficult for the scrapers to fully peel the asphalt off the aggregate particles. This invention provides a window 102 on the outer peripheral wall of the inner shell 1. A vibrating plate 5 is placed inside the window 102 and vibrates along the direction of the window 102. The vibration of the vibrating plate 5 differentiates the falling acceleration of the large and small particles, causing the small particles to detach from the gaps between them. This accelerates the falling speed of the small particles, allowing them to fall out of the gaps 101 faster than the larger particles. This, in turn, allows the larger particles to roll and be fully scraped by the scrapers again. At the same time, the vibration of the vibrating plate 5 causes it to move back and forth towards the interior of the outer shell 2, causing the width of the gap 101 to increase and decrease repeatedly, and to exert a reciprocating and intermittent squeezing effect on the large particles in the gap 101, thereby hindering the large particles from falling into the gap 101 and reducing the falling speed of the large particles, thus prolonging the residence time of the large particles in the gap 101 and allowing them to be more fully subjected to the scraping and peeling effect of the scraper.

[0033] exist Figure 7 In a preferred embodiment shown, the vibrating plate 5 will collide with the inner wall of the window 102 when it vibrates. At the same time, it is also necessary to ensure that the vibrating plate 5 can be stably installed inside the window 102. Therefore, a first elastic member 6 is also included.

[0034] In this design, slots 103 are provided at both ends of the inner wall of window 102 along the flow direction of the mixture, and flanges 51 are provided at both ends of the vibrating plate 5 along the flow direction of the mixture. The flanges 51 are inserted into the slots 103 one by one, and the slots 103 restrict the movement range of the flanges 51.

[0035] The first elastic element 6 is disposed between the side of the flange 51 facing the outer shell 2 and the inner wall of the slot 103. The first elastic element 6 abuts against the surface of the flange 51 facing the outer shell 2 and the inner wall of the slot 103. The vibrating plate 5 vibrates and compresses the first elastic element 6. The first elastic element 6 serves two purposes: firstly, it buffers the flange 51 from colliding with the inner wall of the slot 103 of the contact window 102; secondly, it can be elastically compressed, allowing the outer surface of the vibrating plate 5 to enter the gap 101 and reduce the width of the gap 101.

[0036] exist Figure 6 In a preferred embodiment shown, in order to drive the vibrating plate 5 to vibrate, a motor 7 and a rocker arm 8 are also included.

[0037] The motor 7 is located on the inner wall of the inner housing 1 and near the edge of the window 102. The motor 7 is a rotary motor capable of reciprocating forward and reverse rotation. It is necessary to control the forward and reverse rotation amplitude of the motor 7 to limit the rotation angle of the rocker arm 8, so as to avoid excessive rotation angle of the free end of the rocker arm 8, which would generate excessive squeezing or impact force on the vibrating plate 5 and damage the vibrating plate 5.

[0038] The middle part of the rocker arm 8 is connected to the output shaft of the motor 7. The two ends of the rocker arm 8 extend to the two ends of the vibrating plate 5 away from the outer shell 2. The two ends of the rocker arm 8 swing back and forth around the middle part under the drive of the motor 7, so that the two ends of the rocker arm 8 alternately strike the two ends of the vibrating plate 5 away from the outer shell 2, drive the vibrating plate 5 to vibrate and make the two ends of the vibrating plate 5 alternately squeeze the first elastic element 6 located at the two ends of the vibrating plate 5, and reduce the distance between the surface of the vibrating plate 5 facing the outer shell 2 and the inner wall surface of the outer shell 2, thus reducing the width of the gap 101.

[0039] This solution uses the two ends of the rocker arm 8 to reciprocate and strike the vibrating plate 5 to make it vibrate. Compared with the traditional method of using a reciprocating drive mechanism to make the vibrating plate 5 move back and forth along the orientation of the window 102, the speed of the reciprocating swing of the two ends of the rocker arm 8 is faster than that of the reciprocating mechanism when the motor 7 is at the same speed. Therefore, the vibration frequency of the vibrating plate 5 is higher, resulting in a better separation effect of large and small particles.

[0040] exist Figure 7In a preferred embodiment shown, there is a small gap between the outer contour of the vibrating plate 5 and the inner contour of the window 102. In order to avoid tiny particles from entering these tiny gaps and hindering the vibration of the vibrating plate 5, when the first elastic member 6 is in a relaxed state, the surface of the vibrating plate 5 facing the outer shell 2 is flush with the outer peripheral wall of the inner shell 1, so that the outer contour of the vibrating plate 5 and the inner contour of the window 102 are in close contact with each other.

[0041] exist Figure 2 In a preferred embodiment shown, in order to prolong the falling time of the mixture within the gap 101, both the inner shell 1 and the outer shell 2 are conical, with a feed inlet at the top of the outer shell 2. After the mixture enters the gap 101 through the feed inlet, it rolls down the inclined surface of the inner shell 1, thus slowing down the movement speed of the mixture.

[0042] exist Figure 2 In a preferred embodiment shown, the device body 9 and bracket 10 are further included in the specific implementation.

[0043] The device body 9 is provided with an inner shell 1 and an outer shell 2; a main shaft is vertically arranged in the center of the device body 9, the inner shell 1 is arranged on the main shaft, and a drive motor is installed on the outside of the device body 9. The drive motor drives the main shaft to rotate through the transmission wheel, and drives the inner shell 1 to rotate.

[0044] The bracket 10 is mounted on the main body 9 of the device, and the outer shell 2 is mounted on the bracket 10 and fixed to the bottom of the outer shell 2. A lifting mechanism is provided between the bracket 10 and the main body 9 of the device. The bracket 10 is lifted by the lifting mechanism, which increases the gap 101 and allows large particles stuck in the gap 101 to be released.

[0045] exist Figure 2 In a preferred embodiment shown, since the inner shell 1 can move up and down relative to the outer shell 2, a second elastic member 11 is also included in order to still generate sufficient clamping pressure on the mixture between the inner shell 1 and the outer shell 2.

[0046] The second elastic element 11 is disposed between the bracket 10 and the device body 9, and its two ends are respectively connected to the bracket 10 and the device body 9. The bracket 10 drives the outer shell 2 to move in the vertical direction of the horizontal plane and increases the width of the gap 101, and causes the second elastic element 11 to stretch elastically.

[0047] exist Figure 4 In a preferred embodiment shown, in order to improve the scraping effect of the first scraper 3 and the second scraper 4 on the mixed particles, the extension direction of the first scraper 3 intersects the conical generatrix direction of the inner shell 1, and the extension direction of the second scraper 4 intersects the conical generatrix direction of the outer shell 2. The extension directions of the first scraper 3 and the second scraper 4 intersect.

[0048] like Figure 1 As shown, combined with Figure 5 , Figure 6 and Figure 7 The present invention provides a method for asphalt stripping of recycled asphalt mixtures, which employs the asphalt stripping device described above and includes the following steps.

[0049] Step 1: Feed the mixture into the inlet and allow it to flow through gap 101.

[0050] Step 2: The inner shell 1 rotates axially relative to the outer shell 2. The first scraper 3 drives the mixture passing through the gap 101 to rotate synchronously with the inner shell 1, and the second scraper 4 scrapes the surface of the mixture to remove the asphalt from the surface of the mixture.

[0051] Step 3: During the process of the mixture passing through the gap 101, the vibrating plate 5 vibrates and accelerates the speed of the smaller particles passing through the gap 101. The vibrating plate 5 also vibrates and narrows the width of the gap 101, hindering the speed of the larger particles passing through the gap 101 and prolonging the time that the larger particles are scraped by the second scraper 4. The first elastic member 6 is compressed.

[0052] exist Figure 4 In a preferred embodiment shown, in order to release the large particles stuck in the gap 101, a fourth step is also included: when a large particle is stuck in the gap 101, the moving bracket 10 increases the width of the gap 101 and releases the large particle from the gap 101, and the second elastic member 11 is stretched.

[0053] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. An asphalt stripping device for recycled asphalt mixtures, characterized in that: It includes an inner shell (1), an outer shell (2), a first scraper (3), a second scraper (4), a vibrating plate (5), a first elastic element (6), a motor (7), and a rocker arm (8); The inner shell (1) is fitted inside the outer shell (2) and rotates axially relative to the outer shell (2) about the vertical direction of the horizontal plane. A gap (101) is left between the outer peripheral wall of the inner shell (1) and the inner peripheral wall of the outer shell (2). The mixture passes through the gap (101). A window (102) is opened on the outer peripheral wall of the inner shell (1). A slot (103) is opened at both ends of the inner wall of the window (102) along the flow direction of the mixture. The first scraper (3) and the second scraper (4) are both set in the gap (101) and respectively set on the outer peripheral wall of the inner shell (1) and the inner peripheral wall of the outer shell (2). The first scraper (3) drives the mixture to rotate synchronously with the inner shell (1), so that the second scraper (4) scrapes the surface of the mixture. The vibrating plate (5) is set inside the window (102) and vibrates along the direction of the window (102), and reduces the width of the gap (101). The vibrating plate (5) has flanges (51) at both ends along the flow direction of the mixture, and the flanges (51) are inserted into the slots (103) one by one. The first elastic element (6) is disposed between the side of the flange (51) facing the outer shell (2) and the inner wall of the slot (103). The first elastic element (6) abuts against the surface of the flange (51) facing the outer shell (2) and the inner wall of the slot (103). The vibrating plate (5) vibrates and compresses the first elastic element (6). The motor (7) is disposed on the inner wall surface of the inner housing (1) and near the edge of the window (102); The middle part of the rocker arm (8) is connected to the output shaft of the motor (7). The two ends of the rocker arm (8) extend to the two ends of the vibrating plate (5) away from the outer shell (2). The two ends of the rocker arm (8) swing back and forth around the middle part under the drive of the motor (7), so that the two ends of the rocker arm (8) alternately strike the two ends of the vibrating plate (5) away from the outer shell (2), drive the vibrating plate (5) to vibrate and make the two ends of the vibrating plate (5) alternately squeeze the first elastic element (6) located at the two ends of the vibrating plate (5), and reduce the distance between the surface of the vibrating plate (5) facing the outer shell (2) and the inner wall surface of the outer shell (2), and reduce the width of the gap (101).

2. The asphalt stripping device for recycled asphalt mixture according to claim 1, characterized in that: When the first elastic element (6) is in a relaxed state, the surface of the vibrating plate (5) facing the outer shell (2) is flush with the outer peripheral wall of the inner shell (1).

3. The asphalt stripping device for recycled asphalt mixture according to claim 1, characterized in that: Both the inner shell (1) and the outer shell (2) are conical, and the outer shell (2) has a feed inlet at the top.

4. The asphalt stripping device for recycled asphalt mixture according to claim 3, characterized in that: It also includes the main body of the device (9) and the bracket (10); The device body (9) is provided with an inner shell (1) and an outer shell (2). The bracket (10) is mounted on the main body (9) of the device, and the outer shell (2) is mounted on the bracket (10) and fixedly connected to the bottom of the outer shell (2).

5. The asphalt stripping device for recycled asphalt mixture according to claim 4, characterized in that: It also includes a second elastic element (11), which is disposed between the bracket (10) and the device body (9) and its two ends are respectively connected to the bracket (10) and the device body (9). The bracket (10) drives the outer shell (2) to move in the vertical direction of the horizontal plane and increases the width of the gap (101), and makes the second elastic element (11) elastically stretched.

6. The asphalt stripping device for recycled asphalt mixture according to claim 3, characterized in that: The extension direction of the first scraper (3) intersects the direction of the conical generatrix of the inner shell (1), and the extension direction of the second scraper (4) intersects the direction of the conical generatrix of the outer shell (2). The extension directions of the first scraper (3) and the second scraper (4) intersect.

7. A method for stripping asphalt from recycled asphalt mixtures, characterized in that: The asphalt stripping device according to claim 5 includes the following steps: Step 1: The mixture is fed into the feed inlet and flows through the gap (101). Step 2, the inner shell (1) rotates axially relative to the outer shell (2), the first scraper (3) drives the mixture passing through the gap (101) to rotate synchronously with the inner shell (1), and the second scraper (4) scrapes the surface of the mixture to remove the asphalt from the surface of the mixture; Step 3: During the process of the mixture passing through the gap (101), the vibrating plate (5) vibrates and accelerates the speed of the smaller particles passing through the gap (101), and the vibrating plate (5) vibrates and narrows the width of the gap (101), and hinders the speed of the larger particles passing through the gap (101) and prolongs the time that the larger particles are scraped by the second scraper (4).

8. The asphalt stripping method for recycled asphalt mixtures according to claim 7, characterized in that: It also includes step four, in which when a larger particle gets stuck in the gap (101), the bracket (10) is moved to increase the width of the gap (101) and the larger particle is released from the gap (101), and the second elastic element (11) is stretched.

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