An asphalt pavement aging layer removal machine and its construction method

Abstract

This invention discloses an asphalt pavement aging layer removal machine and its construction method. The asphalt pavement aging layer removal machine includes a frame, a first traveling unit and a second traveling unit connected to the frame, and a first pavement heating device, a second pavement heating device, an aging layer loosening and removal device, and a vertical scraping and lifting device sequentially connected to the frame. The vertical scraping and lifting device includes a vertical scraping and lifting unit and a rotary conveying unit. The vertical scraping and lifting unit scrapes and lifts the old asphalt mixture and inputs it into the rotary conveying unit, which continuously supplies material to the transport vehicle. This invention is suitable for the promotion and application of in-situ hot recycling, and can complete the removal of 5-10mm aging layers from asphalt pavements in one operation without damaging the gradation, thus improving the quality of recycled materials.

Description

Technical Field

[0001] This invention belongs to the field of road maintenance equipment, specifically relating to an asphalt pavement aging layer removal machine and its construction method. Background Technology

[0002] Existing technologies for in-situ thermal recycling have several drawbacks, specifically:

[0003] 1. The aging layer of asphalt pavement affects the quality of recycling. Asphalt pavement will undergo surface aging and deterioration after long-term exposure to the sun and vehicle rolling. The in-situ thermal recycling process uses multiple pavement heating machines to heat and soften the asphalt pavement. The heating methods such as open flame, gas infrared, and high-temperature hot air will also cause the surface 5-10mm of asphalt pavement material to age and scorch. Once the asphalt material ages and deteriorates, its performance is difficult to restore. At present, there is no special equipment for removing the aging layer of asphalt pavement on the market.

[0004] 2. Cold milling of the aging layer of asphalt pavement easily damages the aggregate gradation. In the existing on-site hot recycling construction, the process of using cold milling machines to cut and remove the surface material of asphalt pavement is prone to aggregate damage, affecting the recycling quality. Moreover, the existing cold milling is limited by the maximum milling width, which cannot complete the 4-meter-wide recycling lane operation in one go. It is time-consuming and costly, and cannot meet the requirements of modern asphalt pavement maintenance.

[0005] 3. Continuous and uninterrupted removal of the aged asphalt pavement layer is not feasible. Specialized equipment for the continuous and uninterrupted removal of the aged asphalt pavement layer has not yet been observed in in-situ thermal recycling construction. Summary of the Invention

[0006] To address the aforementioned problems, this invention proposes an asphalt pavement aging layer removal machine and its construction method, which is suitable for the promotion and application of in-situ hot recycling. It can complete the removal of 5-10mm asphalt pavement aging layers in one operation without damaging the gradation, thus improving the quality of recycled materials.

[0007] To achieve the above-mentioned technical objectives and effects, the present invention is implemented through the following technical solution:

[0008] In a first aspect, the present invention provides an asphalt pavement aging layer removal machine, comprising:

[0009] frame;

[0010] The first walking unit and the second walking unit are both connected to the frame;

[0011] A first road surface heating device, a second road surface heating device, an aging layer loosening and removal device, and a vertical scraping and lifting device are sequentially connected to the frame;

[0012] The vertical scraping and lifting device includes a vertical scraping and lifting unit and a rotary conveying unit. The vertical scraping and lifting unit scrapes and lifts the old asphalt mixture and inputs it into the rotary conveying unit, which then continuously supplies material to the transport vehicle.

[0013] Optionally, the asphalt pavement aging layer removal machine further includes a third pavement heating device and a pavement insulation device. The third pavement heating device is connected to the frame and is close to the second traveling unit; the pavement insulation device is connected to the third pavement heating device.

[0014] Optionally, the aging layer loosening and removal device includes a fixed frame, a lifting frame, two sets of symmetrical lifting cylinders, a connecting rod, a loosening conveyor I, a sliding cylinder I, a loosening conveyor II, and a sliding cylinder II;

[0015] The mounting bracket is fixed to the frame;

[0016] The lifting frame is connected to the fixed frame through a parallelogram linkage mechanism;

[0017] The cylinder bodies and piston rods of the two symmetrical sets of lifting cylinders are respectively pinned to the fixed frame and the lifting frame;

[0018] The rake conveyor I and the rake conveyor II are suspended below the lifting frame in a relative manner;

[0019] The cylinder body and piston rod of the sliding cylinder I are respectively pinned to the lifting frame and the rake conveyor I;

[0020] The cylinder body and piston rod of the sliding cylinder II are respectively pinned to the lifting frame and the rake conveyor II.

[0021] Optionally, under the action of the lifting cylinder, the lifting frame can move up and down with the help of the parallelogram linkage mechanism to complete the height adjustment and ensure that the rake conveyor I and rake conveyor II are always in a horizontal state.

[0022] Optionally, under the action of the sliding cylinder I, the rake conveyor I can slide back and forth in the horizontal direction.

[0023] Optionally, under the action of the sliding cylinder II, the rake conveyor II can slide back and forth in the horizontal direction.

[0024] Optionally, both the rake conveyor I and the rake conveyor II are rake screw conveyors.

[0025] Optionally, the vertical scraping and lifting unit includes left and right telescopic sleeves, left and right telescopic cylinders, up and down lifting and sliding components, up and down lifting cylinders, vertical lifting frame, scraper bucket chain, drive shaft, driven shaft, support roller shaft, and discharge port.

[0026] The outer cylinder of the left and right telescopic sleeves is connected to the frame, and the inner cylinder is connected to the upper and lower lifting and sliding assembly.

[0027] The cylinder body and piston rod of the left and right telescopic cylinders are respectively pin-connected to the frame and the upper and lower lifting and sliding assembly;

[0028] The vertical lifting and sliding component is nested within a vertical lifting frame;

[0029] The cylinder body and piston rod of the upper and lower lifting cylinder are respectively pin-connected to the upper and lower lifting sliding assembly and the vertical lifting frame;

[0030] Under the action of the left and right telescopic cylinders, the up and down lifting sliding assembly and the vertical lifting frame can extend and retract left and right;

[0031] Under the action of the up and down lifting cylinders, the vertical lifting frame can be adjusted up and down along the up and down lifting sliding assembly;

[0032] The scraper hopper chain is placed within the vertical lifting frame;

[0033] The drive shaft, support roller shaft, and driven shaft are arranged from top to bottom and are connected to the scraper hopper chain.

[0034] The discharge port is located at the top of the vertical lifting frame;

[0035] The rotary conveying unit includes a receiving hopper, a rotary bearing, and a screw conveyor;

[0036] The screw conveyor is equipped with a receiving hopper at the top, located below the discharge port. The screw conveyor is fixed to the vertical lifting frame by a slewing bearing. Under the action of the slewing bearing, the screw conveyor can achieve circumferential rotation, thereby adjusting the conveying height and angle.

[0037] Optionally, the frame is equipped with a driver's cab and a power system.

[0038] In a second aspect, the present invention provides a construction method for the asphalt pavement aging layer removal machine as described in any one of the first aspects, characterized in that it includes:

[0039] The asphalt pavement aging layer removal machine travels in the recycling lane, while the material transport vehicle travels in the side lane of the recycling lane.

[0040] The old asphalt pavement is heated by the first and second road heating devices of the asphalt pavement aging layer removal machine. The old asphalt pavement is heated and softened to a depth greater than or equal to 10 mm, and the temperature of the 10 mm deep layer is greater than or equal to 110℃.

[0041] The old asphalt pavement is loosened to a depth of 5-10mm using the rake teeth of the rake screw conveyor I and rake screw conveyor II of the aging layer loosening and removal device, and the loosened surface asphalt material is transported from left to right by the screw conveyor; the loosening depth of the old asphalt pavement is adjusted by the lifting cylinder, and the loosening width of the old asphalt pavement is adjusted by the sliding cylinder I and sliding cylinder II.

[0042] The scraper bucket chain of the vertical scraper lifting device completes the scraping and lifting of the old asphalt mixture. The old asphalt mixture falls into the screw conveyor through the discharge port, receiving hopper, and slewing bearing. The slewing bearing is used to adjust the conveying height and angle of the screw conveyor, so as to continuously supply material to the transport vehicle.

[0043] Compared with the prior art, the beneficial effects of the present invention are as follows:

[0044] This invention proposes an asphalt pavement aging layer removal machine and its construction method, which is suitable for on-site hot recycling and can complete the removal of 5-10mm asphalt pavement aging layer in one go without damaging the gradation and improving the quality of recycled materials.

[0045] Furthermore, this invention employs a vertical scraping and lifting device combined with a rotary conveying device to achieve continuous and uninterrupted lateral conveying of old asphalt mixtures, thereby improving operational efficiency. The overall height of the device is adjustable via a lifting cylinder and a parallelogram linkage mechanism, providing excellent adaptability to removing aging layers of varying depths. A novel structure using a bidirectional sliding cylinder and a C-shaped slide rail enables the extension and retraction of the rake-loosening screw conveyor, while the rotary cylinder allows for 15-degree rotation to the left and right, providing excellent adaptability for variable-width operations, curved road construction, and vehicle transportation. The ingenious design results in a high degree of mechanization and automation. Attached Figure Description

[0046] To make the content of this invention easier to understand, the invention will be further described in detail below with reference to specific embodiments and accompanying drawings, wherein:

[0047] Figure 1 This is a front view of the asphalt pavement aging layer removal machine of the present invention;

[0048] Figure 2 This is a left view of the asphalt pavement aging layer removal machine of the present invention;

[0049] Figure 3 This is a top view of the asphalt pavement aging layer removal machine of the present invention;

[0050] Figure 4 The three-dimensional structure of the aging layer loosening and removal device of the present invention. Figure 1 ;

[0051] Figure 5The three-dimensional structure of the aging layer loosening and removal device of the present invention. Figure 2 ;

[0052] Figure 6 This is a front view of the vertical scraping and lifting device of the present invention;

[0053] Figure 7 yes Figure 6 AA section view;

[0054] Figure 8 This is a schematic diagram of the transit transportation status of the present invention.

[0055] In the diagram: 1. Frame; 201. First traveling unit; 202. Second traveling unit; 301. First road surface heating device; 302. Second road surface heating device; 303. Third road surface heating device; 4. Aging layer loosening and removal device; 4-1. Fixed frame; 4-2. Lifting frame; 4-3. Lifting cylinder; 4-4. Connecting rod; 4-5. Loosening auger conveyor I; 4-6. Sliding cylinder I; 4-7. Loosening auger conveyor II; 4-8. Sliding cylinder II; 5. 5-1 Vertical scraping and lifting device; 5-2 Vertical lifting frame; 5-3 Scraper hopper chain; 5-4 Drive shaft; 5-5 Driven shaft; 5-6 Support roller shaft; 5-7 Discharge port; 5-8 Receiving hopper; 5-9 Slewing bearing; 5-10 Screw conveyor; 5-11 Left and right telescopic sleeve; 5-12 Left and right telescopic cylinder; 5-13 Up and down lifting and sliding assembly; 5-14 Up and down lifting cylinder; 6. Driver's cab; 7. Power system; 8. Road surface insulation device. Detailed Implementation

[0056] To make the objectives, technical solutions, and advantages of this invention clearer, the invention will be further described in detail below with reference to embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the scope of protection of the invention.

[0057] The application principle of the present invention will be described in detail below with reference to the accompanying drawings.

[0058] Example 1

[0059] To address the issue of the aging layer of asphalt pavement affecting the quality of recycling, the following specific problems exist: long-term exposure to sunlight and vehicle traffic can cause surface aging and deterioration of asphalt pavement; in-situ thermal recycling processes use multiple road heating machines to soften the asphalt pavement, and the use of heating methods such as open flame, gas infrared, and high-temperature hot air can also lead to aging and scorching of the surface 5-10mm of asphalt pavement material. Once the asphalt material ages and deteriorates, its performance is difficult to restore.

[0060] like Figures 1 to 7As shown, this embodiment of the invention provides an asphalt pavement aging layer removal machine, including a frame 1, and a first pavement heating device 301, a first traveling unit 201, a second pavement heating device 302, an aging layer loosening and removal device 4, a vertical scraper lifting device 5, a second traveling unit 202, a third pavement heating device 303, and a pavement insulation device 8 connected to the frame and arranged sequentially. The frame also includes a driver's cab 6 and a power system 7 arranged sequentially. Figure 4-5 As shown, the aging layer loosening and removal device 4 includes a fixed frame 4-1, a lifting frame 4-2, a lifting cylinder 4-3, a connecting rod 4-4, a loosening spiral conveyor I 4-5, a sliding cylinder I 4-6, a loosening spiral conveyor II 4-7, and a sliding cylinder II 4-8. The fixed frame 4-1 is fixed to the machine frame 1. The lifting frame 4-2 is connected to the fixed frame 4-1 through four sets of connecting rods 4-4, forming a parallelogram linkage mechanism. The two sets of lifting cylinders are symmetrical on the left and right. The cylinder body and piston rod of 4-3 are respectively pinned to the fixed frame 4-1 and the lifting frame 4-2; the rake auger conveyor I 4-5 and the rake auger conveyor II 4-7 are suspended one after the other below the lifting frame 4-2; the cylinder body and piston rod of the sliding cylinder I 4-6 are respectively pinned to the lifting frame 4-2 and the rake auger conveyor I 4-5; the cylinder body and piston rod of the sliding cylinder II 4-8 are respectively pinned to the lifting frame 4-2 and the rake auger conveyor II 4-7. This invention adopts a new structure of bidirectional sliding cylinder and C-shaped slide rail to realize the extension and retraction of the rake auger conveyor. As the lane width changes, the rake auger conveyor extends and retracts, realizing variable width operation.

[0061] To achieve continuous and uninterrupted removal of the aged asphalt pavement layer, the vertical scraper lifting device 5 of this invention adopts a vertical scraper lifting + rotary conveying process, realizing continuous and uninterrupted lateral conveying of the old asphalt mixture and improving operational efficiency. Figure 6-7As shown, the vertical scraping and lifting device 5 includes a vertical lifting frame 5-1, a scraper hopper chain 5-2, a drive shaft 5-3, a driven shaft 5-4, a support roller shaft 5-5, a discharge port 5-6, a receiving hopper 5-7, a slewing bearing 5-8, a screw conveyor 5-9, left and right telescopic sleeves 5-10, left and right telescopic cylinders 5-11, a vertical lifting and sliding assembly 5-12, and a vertical lifting cylinder 5-13. The outer cylinder of the left and right telescopic sleeve 5-10 is connected to the frame 1, and the inner cylinder is connected to the vertical lifting and sliding assembly 5-12. The cylinder body and piston rod of the left and right telescopic cylinder 5-11 are pin-connected to the frame 1 and the vertical lifting and sliding assembly 5-12, respectively. The vertical lifting frame 5-1 is nested within the vertical lifting frame 5-1. The cylinder body and piston rod of the vertical lifting cylinder 5-13 are pin-connected to the vertical lifting and sliding assembly 5-12 and the vertical lifting frame 5-1, respectively. Under the action of the left and right telescopic hydraulic cylinders 5-11, the up and down lifting sliding assembly 5-12 and the vertical lifting frame 5-1 can achieve left and right telescopic movement. Under the action of the up and down lifting hydraulic cylinders 5-13, the vertical lifting frame 5-1 can achieve up and down height adjustment along the up and down lifting sliding assembly 5-12. The scraper hopper chain 5-2 is placed in the vertical lifting frame 5-1. The drive shaft 5-3, the support roller shaft 5-5 and the driven shaft 5-4 are arranged from top to bottom and are chained to the scraper hopper chain 5-2. The discharge port 5-6 is located at the top of the vertical lifting frame 5-1. The screw conveyor 5-9 is equipped with a receiving hopper 5-7 on its upper part and is located below the discharge port 5-6. The screw conveyor 5-9 is fixed to the vertical lifting frame 5-1 through the slewing bearing 5-8. Under the action of the slewing bearing 5-8, the screw conveyor 5-9 can achieve circumferential rotation, realizing the adjustment of the conveying height and angle.

[0062] The third road surface heating device 303 and the road surface insulation device 8 described in this invention are used to heat and insulate the old asphalt road surface after the aging layer has been removed by the aging layer loosening and removal device 4.

[0063] This invention utilizes a lifting cylinder and a parallelogram linkage mechanism to achieve overall height adjustment of the device, providing good adaptability to the removal of aging layers at different depths; and utilizes a bidirectional sliding cylinder to achieve left and right sliding of the device, providing good adaptability to the removal of aging layers at different road widths.

[0064] Under the action of lifting cylinder 4-3, the lifting frame 4-2 can move up and down with the help of parallelogram connecting rod 4-4 mechanism, thereby driving the downstream device to achieve height adjustment and ensuring that the loosening screw conveyor I 4-5 and loosening screw conveyor II 4-7 are always in a horizontal state; under the action of sliding cylinder I 4-6, the loosening screw conveyor I 4-5 can slide left and right; under the action of sliding cylinder II 4-8, the loosening screw conveyor II 4-7 can slide left and right.

[0065] Example 2

[0066] Based on the asphalt pavement aging layer removal machine in Example 1, the present invention also provides a method for removing the asphalt pavement aging layer, including:

[0067] Step S1: An asphalt pavement aging layer removal machine travels in the recycling lane, and a material transport vehicle travels in the side lane of the recycling lane.

[0068] Step S2: The first two sets of road heating devices 3 of the asphalt pavement aging layer removal machine heat the old asphalt pavement; the heating and softening depth of the old asphalt pavement is not less than 10mm, and the temperature of the 10mm deep layer is not less than 110℃.

[0069] Step S3: The old asphalt pavement is loosened to a depth of 5-10mm using the rake teeth of the rake screw conveyor I 4-5 and rake screw conveyor II 4-7 of the aging layer loosening and removal device 4, and the loosened surface asphalt material is transported from left to right by the screw conveyor; the loosening depth of the old asphalt pavement is adjusted by the lifting cylinder 4-3, and the loosening width of the old asphalt pavement is adjusted by the sliding cylinder I 4-6 and sliding cylinder II 4-8.

[0070] Step S4: The scraper bucket chain 5-2 of the vertical scraper lifting device 5 scrapes and lifts the old asphalt mixture. The old asphalt mixture falls from the discharge port 5-6, through the receiving hopper 5-7, and through the slewing bearing 5-8 into the screw conveyor 5-9. The slewing bearing 5-8 is used to adjust the conveying height and angle of the screw conveyor 5-9, achieving uninterrupted feeding of material to the transport vehicle. See details below. Figure 8 .

[0071] This invention provides an asphalt pavement aging layer removal machine, suitable for in-situ hot recycling. It employs a two-stage hot rake loosening + conveying screw process to remove 5-10mm aging layers from asphalt pavements in a single operation, without damaging the gradation and improving the quality of recycled materials. The use of a vertical scraper lifting device + rotary conveying device enables continuous lateral conveying of the old asphalt mixture, improving operational efficiency. The lifting cylinder + parallelogram linkage mechanism allows for overall height adjustment, providing good adaptability to removing aging layers of varying depths. A novel bidirectional sliding cylinder and C-shaped slide rail structure enables the extension and retraction of the rake loosening screw conveyor. The ingenious design results in a high degree of mechanization and automation.

[0072] The foregoing has shown and described the basic principles, main features, and advantages of the present invention. Those skilled in the art should understand that the present invention is not limited to the above embodiments. The embodiments and descriptions in the specification are merely illustrative of the principles of the invention. Various changes and modifications can be made to the invention without departing from its spirit and scope, and all such changes and modifications fall within the scope of the present invention as claimed. The scope of protection of this invention is defined by the appended claims and their equivalents.

Claims

1. A machine for removing aged asphalt pavement layers, characterized in that, include: frame; The first road surface heating device, the first traveling unit, the second road surface heating device, the aging layer loosening and removal device, the vertical scraping and lifting device, and the second traveling unit are sequentially connected to the frame. The vertical scraping and lifting device includes a vertical scraping and lifting unit and a rotary conveying unit. The vertical scraping and lifting unit completes the scraping and lifting of the old asphalt mixture and inputs the old asphalt mixture into the rotary conveying unit, which then continuously supplies material to the transport vehicle. The vertical scraping and lifting unit includes left and right telescopic sleeves, left and right telescopic cylinders, up and down lifting and sliding components, up and down lifting cylinders, vertical lifting frame, scraper bucket chain, drive shaft, driven shaft, support roller shaft, and discharge port; The outer cylinder of the left and right telescopic sleeves is connected to the frame, and the inner cylinder is connected to the upper and lower lifting and sliding assembly. The cylinder body and piston rod of the left and right telescopic hydraulic cylinders are respectively pin-connected to the frame and the upper and lower lifting and sliding assembly; A nested vertical lifting frame with vertical lifting and sliding components; The cylinder body and piston rod of the upper and lower lifting cylinder are respectively pin connected to the upper and lower lifting sliding assembly and the vertical lifting frame; Under the action of the left and right telescopic hydraulic cylinders, the up and down lifting sliding component and the vertical lifting frame can achieve left and right telescopic movement; Under the action of the lifting cylinders, the vertical lifting frame can be adjusted up and down along the lifting sliding assembly. The scraper bucket chain is placed within a vertical lifting frame; The drive shaft, support roller shaft, and driven shaft are arranged from top to bottom and connected to the scraper hopper chain; The discharge port is located at the top of the vertical lifting frame; The rotary conveying unit includes a receiving hopper, a rotary bearing, and a screw conveyor; The screw conveyor is equipped with a receiving hopper at the top, located below the discharge port. The screw conveyor is fixed to the vertical lifting frame by a slewing bearing. Under the action of the slewing bearing, the screw conveyor can realize circumferential rotation, thereby adjusting the conveying height and angle. The aging layer loosening and removal device includes a fixed frame, a lifting frame, two sets of symmetrical lifting cylinders, a connecting rod, a loosening conveyor I, a sliding cylinder I, a loosening conveyor II, and a sliding cylinder II; The mounting bracket is fixed to the frame; The lifting frame is connected to the fixed frame through a parallelogram linkage mechanism; The cylinder bodies and piston rods of the two symmetrical sets of lifting cylinders are respectively pinned to the fixed frame and the lifting frame; The rake conveyor I and the rake conveyor II are suspended below the lifting frame in a relative manner; The cylinder body and piston rod of the sliding cylinder I are respectively pinned to the lifting frame and the rake conveyor I; The cylinder body and piston rod of the sliding cylinder II are respectively pinned to the lifting frame and the rake conveyor II.

2. The asphalt pavement aging layer removal machine according to claim 1, characterized in that: The asphalt pavement aging layer removal machine also includes a third pavement heating device and a pavement insulation device. The third pavement heating device is connected to the frame and is close to the second traveling unit; the pavement insulation device is connected to the third pavement heating device.

3. The asphalt pavement aging layer removal machine according to claim 1, characterized in that: Under the action of the lifting cylinder, the lifting frame can move up and down with the help of the parallelogram linkage mechanism to complete the height adjustment and ensure that the rake conveyor I and rake conveyor II are always in a horizontal state.

4. The asphalt pavement aging layer removal machine according to claim 1, characterized in that: Under the action of the sliding cylinder I, the rake conveyor I can slide back and forth in the horizontal direction.

5. The asphalt pavement aging layer removal machine according to claim 1, characterized in that: Under the action of the sliding cylinder II, the rake conveyor II can slide back and forth in the horizontal direction.

6. The asphalt pavement aging layer removal machine according to claim 1, characterized in that: Both the rake conveyor I and the rake conveyor II are rake screw conveyors.

7. The asphalt pavement aging layer removal machine according to claim 1, characterized in that: The frame is also equipped with a driver's cab and a power system.

8. A construction method for an asphalt pavement aging layer removal machine according to any one of claims 1-7, characterized in that, include: An asphalt pavement aging layer removal machine travels in the recycling lane, while a material transport vehicle travels in the side lane of the recycling lane. The old asphalt pavement is heated by the first and second road heating devices of the asphalt pavement aging layer removal machine. The old asphalt pavement is heated and softened to a depth greater than or equal to 10 mm, and the temperature of the 10 mm deep layer is greater than or equal to 110℃. The old asphalt pavement is loosened to a depth of 5-10mm using the rake teeth of the rake screw conveyor I and rake screw conveyor II of the aging layer loosening and removal device, and the loosened surface asphalt material is transported from left to right by the screw conveyor; the loosening depth of the old asphalt pavement is adjusted by the lifting cylinder, and the loosening width of the old asphalt pavement is adjusted by the sliding cylinder I and sliding cylinder II. The scraper bucket chain of the vertical scraper lifting device completes the scraping and lifting of the old asphalt mixture. The old asphalt mixture falls into the screw conveyor through the discharge port, receiving hopper, and slewing bearing. The slewing bearing is used to adjust the conveying height and angle of the screw conveyor, so as to continuously supply material to the transport vehicle.

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