A medium spraying system and paver for in-situ thermal recycling

Abstract

The application discloses a medium spraying system for in-situ hot recycling and a paver, and the spraying system comprises a medium spraying device, the medium spraying device comprises a prime mover, a transmission mechanism and a plurality of rotary spraying rods; the rear end of each rotary spraying rod is rotationally connected with a bearing seat on a fixing seat, the front end of each rotary spraying rod is connected with a nozzle for spraying medium, and two adjacent rotary spraying rods are connected through a spraying rod linkage rod; one of the rotary spraying rods is connected with the prime mover through the transmission mechanism, so that when the prime mover works, the plurality of rotary spraying rods are driven to swing around the bearing seat. The application realizes the swinging of the plurality of rotary spraying rods around the bearing seat through the working of the prime mover, which ensures the uniformity of spraying on one hand and the spraying range on the other hand; and the form of the nozzle ensures the atomization effect of the spraying medium.

Description

Technical Field

[0001] This invention relates to the field of road maintenance equipment technology, specifically to a media spraying system and paver for in-situ thermal recycling. Background Technology

[0002] The asphalt pavement rake-mix sculpting paver is a crucial component of the in-situ thermal recycling system, located after multiple asphalt pavement heaters. These heaters heat and soften the asphalt pavement to a depth of 4-6 cm. The rake-mix sculpting paver then evenly spreads a specific proportion of recycling agent / hot asphalt onto the surface, restoring the activity of the aged asphalt and adjusting the original asphalt-aggregate ratio. The 4-6 cm asphalt pavement surface layer is then rake-loosened, screed, and laid. The uniformity and metering accuracy of the recycling agent / hot asphalt application to the asphalt pavement surface are particularly important, as they determine the gradation stability and recycling quality of the in-situ thermal recycling. Uneven application and inaccurate metering can easily lead to an unqualified asphalt-aggregate ratio, resulting in early rutting, spalling, and other defects on the recycled pavement.

[0003] The speed of in-situ thermal recycling operations is 3-5 m / min, and the amount of medium applied is 3%-5% of the original asphalt content of the road surface. Due to the relatively small overall amount of medium added, the number of spray nozzles should not be too many, and it is impossible to complete the process using conventional asphalt spraying trucks and structures available on the market. Existing methods for applying recycling agents / hot asphalt in the in-situ thermal recycling industry mainly include two types: pipe dripping and disc spraying. The pipe dripping method uses a transverse porous pipe to allow the medium to drip freely onto the asphalt road surface under its own gravity. The medium is in strip shape, the dripping is uneven, the pipe is prone to clogging, and the metering accuracy is low. The disc spraying method mostly uses a DC motor connected to a rotating disc via a vertical rod. The medium flows into the disc, and the disc's circumferential centrifugal force spreads the medium into droplets. The spraying width is not adjustable, and the spraying uniformity and accuracy are not up to standard.

[0004] In summary, both tubular dripping and disc spraying methods suffer from poor atomization and uneven distribution. Summary of the Invention

[0005] The purpose of this invention is to provide a medium spraying system and paver for in-situ thermal recycling, so as to solve the problems of poor atomization effect and poor spraying uniformity in the prior art.

[0006] To achieve the above objectives, the present invention is implemented using the following technical solution:

[0007] In a first aspect, this application discloses a medium spraying system for in-situ thermal regeneration, including a medium spraying device, wherein the medium spraying device includes a prime mover, a transmission mechanism and a plurality of rotating spraying rods;

[0008] The rear end of each of the rotating spray bars is rotatably connected to a bearing seat on a fixed base, and the front end of each of the rotating spray bars is connected to a nozzle for spraying the medium. Adjacent rotating spray bars are connected by a spray bar linkage rod.

[0009] One of the rotating spray rods is connected to a prime mover via a transmission mechanism, so that when the prime mover is working, it drives multiple rotating spray rods to swing around the bearing seat.

[0010] Furthermore, the transmission mechanism is a fan-shaped swing linkage mechanism;

[0011] The fan-shaped swing linkage mechanism includes a first link and a second link hinged at one end. The other ends of the prime mover and the first link are respectively connected to the input and output ends of the reducer. The other end of the second link is connected to one of the rotating spray rods.

[0012] Furthermore, the reducer is a worm gear reducer.

[0013] Furthermore, it also includes a medium pipeline, which includes a main electric heating element, a branch unit, valves, and multiple branch electric heating elements;

[0014] One end of the main electric heating tube is connected to the liquid outlet pipe of the medium tank, and the other end is connected to the liquid inlet of the branch device. Several sets of liquid outlets of the branch device are connected to the branch electric heating tubes through valves. Multiple branch electric heating tubes are connected to the rotating spray bar, and the rotating spray bar is connected to the nozzle.

[0015] Furthermore, it also includes an air passage, one end of which is connected to the air source of the whole machine, and the other end is connected to the nozzle.

[0016] Furthermore, a conical media protection cover is connected to the outside of the nozzle.

[0017] Furthermore, there are two media spraying devices;

[0018] The fixed seats in the two media spraying devices are respectively connected to the two side rake frames of the road loosening device, so as to adjust the spraying width when the side rake frames slide along the main rake frame.

[0019] Furthermore, the spray bar linkage is a spray bar linkage with adjustable length.

[0020] Furthermore, the length of the rotating spray bar is 0.5-0.7m, and the swing angle is 0-80°. The swing angle refers to the swing angle on one side, and the maximum swing angle on both sides is 160°. This design ensures that the left-right span of a single set of spray heads covers a range of no less than 1 meter.

[0021] Secondly, this application discloses a method for spraying a medium for in-situ thermal regeneration, employing the system described in any one of the first aspects, the spraying method comprising:

[0022] The system obtains the speed of the main unit and controls the spray volume of the nozzles based on the speed of the main unit, so that the spray volume is linked to the speed of the main unit.

[0023] The frequency of the rotating spray bar's movement is obtained, and the spray pulse width is controlled according to the frequency of the rotating spray bar's movement, so that the spraying of the nozzle starts and stops with the swing of the rotating spray bar.

[0024] Thirdly, this application discloses a paver that includes the in-situ thermal recycling medium spraying system described in any of the first aspects.

[0025] According to the above technical solution, the beneficial effects of the present invention are as follows:

[0026] The spraying system designed in this application uses a rotating spraying rod that swings on the bearing seat and a nozzle at the end of the rotating spraying rod. Compared with dripping and splashing, the swinging nozzle has better spraying uniformity, and the use of nozzles to spray the medium ensures the atomization effect of the medium.

[0027] The media spraying device includes multiple rotating spray bars. Two adjacent rotating spray bars are connected by a spray bar linkage rod. When one rotating spray bar swings, multiple rotating spray bars swing simultaneously, ensuring the spraying range and effect of the media. Attached Figure Description

[0028] Figure 1 This is a schematic diagram of the overall structure of the spraying system of the present invention;

[0029] Figure 2 These are schematic diagrams of the spraying system of the present invention from different perspectives;

[0030] Figure 3 This is a schematic diagram of the paver of the present invention;

[0031] Figure 4 These are schematic diagrams of the paver of the present invention from different perspectives.

[0032] The components include: 1. Medium tank; 2. Medium pipeline; 2-1. Main electric heating tube; 2-2. Brancher; 2-3. Valve; 2-4. Branch electric heating tube; 3. Gas line; 4. Medium spraying device; 4-1. Fan-shaped swing linkage mechanism; 4-1-1. First fixed seat; 4-1-2. Drive motor; 4-1-3. Worm gear reducer; 4-1-4. First connecting rod; 4-1-5. First bearing seat; 4-1-6. Second connecting rod; 4-1-7. Second fixed seat; 4-1-8. Second bearing seat; 4-2. First rotating spray bar; 4-3. Second rotating spray bar; 4-4. Spray bar linkage rod; 4-5. Nozzle; 5. Frame; 6. Road surface loosening device; 6-1. Side loosening frame. Implementation

[0033] To make the technical means, creative features, objectives and effects of this invention easier to understand, the invention will be further described below in conjunction with specific embodiments.

[0034] It should be noted that in the description of this invention, the terms "front," "rear," "left," "right," "upper," "lower," "inner," and "outer," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. These terms are used only for the convenience of describing the invention and do not require the invention to be constructed and operated in a specific orientation; therefore, they should not be construed as limitations on the invention. The terms "front," "rear," "left," "right," "upper," and "lower" used in the description of this invention refer to the directions shown in the accompanying drawings, while the terms "inner" and "outer" refer to directions toward or away from the geometric center of a specific component, respectively.

[0035] In addition to the problems mentioned in the background technology above, current spraying systems also have other problems such as the spraying width being mostly fixed-point spraying, the inability to cover a spraying width of 3 meters to 4.5 meters, and poor adaptability to working conditions.

[0036] This invention provides a media spraying system for in-situ thermal recycling, which adopts a constant pressure pulse spraying method, high-pressure atomization of the media, fan-shaped spraying, and linkage control between the spraying volume and the operating vehicle speed. The spraying bar automatically swings in a fan shape to spray the media, resulting in uniform media spraying and high metering accuracy. With the help of the infinite extension of the road loosening device, the entire media spraying device can slide left and right, and the spraying width can be infinitely adjusted from 3 meters to 4.5 meters, with good adaptability to working conditions.

[0037] like Figures 1 to 4 As shown, the present invention provides a media spraying system for in-situ thermal recycling and a raking and shaping paver, comprising: a media tank 1, a media pipeline 2, an air pipeline 3, and a media spraying device 4; the media tank 1 is fixed above the frame 5, the media spraying device 4 is assembled at the front of the road loosening device 6, the media pipeline 2 is provided between the media tank 1 and the media spraying device 4, and one end of the air pipeline 3 is connected to the air source of the whole machine and the other end is connected to the media spraying device 4.

[0038] The medium spraying device 4 includes a prime mover, a transmission mechanism, and multiple rotating spray rods; the rear end of each rotating spray rod is rotatably connected to a bearing seat on a fixed base, and the front end of each rotating spray rod is connected to a nozzle 4-5 for spraying the medium. Adjacent rotating spray rods are connected by a spray rod linkage rod 4-4; one of the rotating spray rods is connected to the prime mover through the transmission mechanism so that when the prime mover is working, it drives multiple rotating spray rods to swing around the bearing seat.

[0039] The driving mechanism enables multiple rotating spray rods to oscillate around the bearing seat, ensuring both uniform spraying and a wide spraying range. The nozzle design ensures the atomization effect of the sprayed medium.

[0040] Furthermore, the transmission mechanism is a fan-shaped swing linkage mechanism 4-1; the fan-shaped swing linkage mechanism 4-1 includes a first link 4-1-4 and a second link 4-1-6 hinged at one end, the other end of the prime mover and the first link 4-1-4 are respectively connected to the input and output ends of the reducer, and the other end of the second link 4-1-6 is connected to one of the rotating spray rods.

[0041] The linkage assembly ensures the effective rotation of the spray bar around the bearing housing.

[0042] In other embodiments, the transmission structure may take other forms than the fan-shaped swing linkage mechanism 4-1, such as a reversible motor and a crank-slider mechanism. The fan-shaped swing linkage mechanism 4-1 is less expensive than a reversible motor and easier to install than a crank-slider mechanism.

[0043] The present application will be described below through specific embodiments.

[0044] One of the innovative aspects of this invention is that the media spraying device 4 includes a fan-shaped swing linkage mechanism 4-1, a first rotating spray bar 4-2, a second rotating spray bar 4-3, a spray bar linkage rod 4-4, a nozzle 4-5, and a conical media protective cover 4-6; the fan-shaped swing linkage mechanism 4-1 includes a first fixed base 4-1-1, a drive motor 4-1-2, a worm gear reducer 4-1-3, a first connecting rod 4-1-4, a first bearing seat 4-1-5, a second connecting rod 4-1-6, a second fixed base 4-1-7, and a second shaft. Support 4-1-8; the first fixed seat 4-1-1 is fixed to the front end of the side rake frame 6-1 of the road loosening device 6. The worm gear reducer 4-1-3 is mounted on the first fixed seat 4-1-1. The input and output ends of the worm gear reducer 4-1-3 are respectively connected to the drive motor 4-1-2 and the first connecting rod 4-1-4. The lower part of the first connecting rod 4-1-4 is connected to the second connecting rod 4-1-6 through a pin. The upper part of the first bearing seat 4-1-5 is equipped with the first rotating spray rod 4-2. The other end of the second connecting rod 4-1-6 is connected to... The first rotating spray bar 4-2 is connected to the second rotating spray bar 4-3. A nozzle 4-5 is mounted at the front end of the first rotating spray bar 4-2 and the second rotating spray bar 4-3. The nozzle 4-5 is entirely covered by a conical media protective cover 4-6. The second fixed seat 4-1-7 is fixed to the front end of the side loosening frame 6-1 of the road loosening device 6. The second bearing seat 4-1-8 is mounted on the second fixed seat 4-1-7. The second rotating spray bar 4-3 is mounted on the second bearing seat 4-1-8. A spraying mechanism is set between the first rotating spray bar 4-2 and the second rotating spray bar 4-3. Linkage rod 4-4; Under the action of drive motor 4-1-2, worm gear reducer 4-1-3 rotates and drives first link 4-1-4 to rotate in a circle, driving second link 4-1-6 to swing back and forth, thereby driving first rotating spray rod 4-2 to swing back and forth in a fan shape around the axis of first bearing seat 4-1-5. At the same time, under the drive of spray rod linkage rod 4-4, second rotating spray rod 4-3 swings back and forth in a fan shape around the axis of second bearing seat 4-1-8, ultimately realizing the fan-shaped swing spraying of multiple nozzles 4-5.

[0045] Furthermore, the medium pipeline 2 includes a main electric heating tube 2-1, a branch 2-2, a valve 2-3, and branch electric heating tubes 2-4. One end of the main electric heating tube 2-1 is connected to the liquid outlet pipe of the medium tank 1, and the other end is connected to the liquid inlet of the branch 2-2. The branch 2-2 is placed vertically, and several sets of liquid outlets are connected to each branch electric heating tube 2-4 through the valve 2-3. Each branch electric heating tube 2-4 is connected to the first rotating spray bar 4-2 and the second rotating spray bar 4-3, and communicates with each nozzle 4-5.

[0046] The installation of the main electric heating tube 2-1 and the branch electric heating tube 2-4 prevents the spraying medium from solidifying and blocking the pipeline, thus ensuring the atomization effect of the subsequent nozzles on the medium.

[0047] At least four sets of nozzles 4-5 are set, and the coverage area of ​​a single set of nozzles 4-5 is not less than 1 meter in the left and right span. The nozzles 4-5 adopt a one-to-one control method (that is, each nozzle 4-5 is connected to the air source of the whole machine through a single air pipe 3-1 and is controlled independently). The spraying mode of each nozzle 4-5 adopts constant pressure pulse spraying mode. The spray volume is automatically adjusted and linked with the speed of the main unit. The spray pulse width matches the action frequency of the fan-shaped swing linkage mechanism 4-1 (that is, when the fan-shaped swing linkage mechanism 4-1 is activated, the nozzles 4-5 spray continuously, and when it is not activated, the nozzles 4-5 stop spraying).

[0048] Through the above settings, this invention introduces a constant pressure pulse spraying method for the medium, which features high-pressure atomization and fan-shaped spraying of the medium. The spraying volume is controlled in conjunction with the operating vehicle speed, and the spraying bar automatically swings in a fan shape to spray. This overcomes the problems of poor atomization, uneven dripping, easy pipe blockage, and low metering accuracy of existing tubular dripping and disc-type spraying methods on the market. The medium is sprayed evenly with a metering accuracy of ±1%.

[0049] Furthermore, the spray width of traditional media is mostly fixed-point spraying, which cannot cover a range of 3-4.5 meters, resulting in poor adaptability to various working conditions. To solve this problem, this invention introduces a continuously extending media spraying structure.

[0050] The second innovation of this invention is that the side rake frames 6-1 of the road loosening device 6 are arranged symmetrically on the left and right sides. Furthermore, the side rake frames 6-1 are symmetrically arranged on the main rake frame and are slidably connected to the main rake frame via slide rails. They can slide left and right along the rails using hydraulic cylinders. There are two media spraying devices, each connected to one end of the side rake frame 6-1. The hydraulic cylinders drive the side rake frames 6-1 to slide left and right, thereby causing the media spraying device 4 to slide left and right as a whole, thus achieving stepless adjustment of the spraying width from 3 meters to 4.5 meters.

[0051] Furthermore, the length of the rotating spray bar is 0.5-0.7m, and the swing angle is 0-80°. The swing angle refers to the swing angle on one side, and the maximum swing angle on both sides is 160°. This design ensures that the left-right span of a single set of spray heads covers a range of no less than 1 meter.

[0052] In some further embodiments, the length of the spray bar linkage 4-4 is adjustable, and the angle at which the second rotating spray bar 4-3 swings left and right with the first rotating spray bar 4-2 can be adjusted by changing the length, thereby adjusting the spray width.

[0053] Specifically, the adjustable-length spray bar linkage 4-4 can be adjusted electrically or manually. Electric adjustment can be achieved using an electric push rod. Manual adjustment can be achieved using a threaded rod or a sleeve.

[0054] In summary, the spraying system provided by this invention adopts a constant pressure pulse spraying method, which atomizes the medium under high pressure and sprays it in a fan shape. The spray volume is controlled in conjunction with the operating vehicle speed, and the spraying bar automatically swings in a fan shape to spray. This overcomes the problems of poor atomization, uneven dripping, easy pipe blockage, and low metering accuracy of existing pipe-type dripping and disc-type spraying methods on the market. The medium is sprayed evenly with a metering accuracy of ±1%. With the help of the infinite extension of the road loosening device, the entire medium spraying device can slide left and right, and the spraying width can be infinitely adjusted from 3 meters to 4.5 meters, which has good adaptability to working conditions.

[0055] In one embodiment, this application also discloses a method for spraying a medium for in-situ thermal regeneration, wherein the spraying system provided in any of the above embodiments includes:

[0056] Step 1: Obtain the main unit's travel speed and control the spray volume of the nozzles according to the main unit's travel speed, so that the spray volume is linked to the main unit's travel speed.

[0057] In this step, the main unit's travel speed can be obtained through sensors or directly through the speedometer of the main unit. The spray volume of the sprinkler heads can be controlled by adjusting the solenoid valve on the pipeline connected to the sprinkler heads. The spray volume of the sprinkler heads can be adjusted by adjusting the opening degree of the solenoid valve.

[0058] If the main unit's travel speed is set to be positively correlated with the spray volume of the nozzles, when the main unit's travel speed increases, the spray volume of the nozzles can be increased by increasing the opening of the solenoid valve.

[0059] Step 2: Obtain the frequency of the rotating spray bar's movement, and control the spray pulse width according to the frequency of the rotating spray bar's movement, so that the spraying of the nozzle starts and stops with the swing of the rotating spray bar.

[0060] In this step, the spray pulse width matches the operating frequency of the fan-shaped swing linkage mechanism, that is, the nozzle sprays continuously when the fan-shaped swing linkage mechanism is in motion, and stops spraying when it is not in motion.

[0061] In one embodiment, such as Figure 3 , 4 As shown, the present invention also provides a rake-mix sizing paver, including an in-situ thermal recycling medium spraying system having the above-mentioned features.

[0062] As is known from common technical knowledge, this invention can be implemented through other embodiments that do not depart from its spirit or essential characteristics. Therefore, the disclosed embodiments described above are merely illustrative in all respects and are not the only ones. All modifications within the scope of this invention or its equivalents are included in this invention.

Claims

1. A medium spreading system for hot-in-place recycling, characterized by, The system comprises a medium spraying device (4), the medium spraying device (4) comprising a prime mover, a transmission mechanism and a plurality of rotating spraying rods; The rear end of each rotating spraying rod is rotatably connected with a bearing seat on a fixed seat, and the front end of each rotating spraying rod is connected with a spray head (4-5) for spraying medium, and two adjacent rotating spraying rods are connected through a spraying rod linkage rod (4-4); One of the rotating spraying rods is connected with the prime mover through the transmission mechanism, so that when the prime mover works, the plurality of rotating spraying rods are driven to swing around the bearing seat; The system further comprises a medium pipeline (2), the medium pipeline (2) comprising a main electric heating pipe (2-1), a branch device (2-2), a valve (2-3) and a plurality of branch electric heating pipes (2-4); One end of the main electric heating pipe (2-1) is connected with a liquid outlet pipeline of a medium tank (1), and the other end is connected with a liquid inlet of the branch device (2-2), a plurality of groups of liquid outlets of the branch device (2-2) are connected with each branch electric heating pipe (2-4) through the valve (2-3), and the plurality of branch electric heating pipes (2-4) are connected with the rotating spraying rods, and the rotating spraying rods are communicated with the spray head (4-5).

2. The medium spreading system for hot-in-place recycling according to claim 1, characterized in that, The transmission mechanism is a fan-shaped swing linkage mechanism (4-1); The fan-shaped swing linkage mechanism (4-1) comprises a first connecting rod (4-1-4) and a second connecting rod (4-1-6) which are hingedly connected at one end, the prime mover and the other end of the first connecting rod (4-1-4) are respectively connected with the input and output ends of a speed reducer, and the other end of the second connecting rod (4-1-6) is connected with one of the rotating spraying rods.

3. The medium spreading system for hot-in-place recycling according to claim 1, characterized in that, The system further comprises an air circuit (3), one end of the air circuit (3) is connected with an air source of the whole machine, and the other end is communicated with the spray head (4-5).

4. The medium spreading system for hot-in-place recycling according to claim 1, characterized by, The spray head (4-5) is externally connected with a conical medium protection cover (4-6).

5. The medium spreading system for hot-in-place recycling according to claim 1, characterized in that, The medium spraying device (4) has two; The fixed seats of the two medium spraying devices (4) are respectively connected with two side harrowing frame (6-1) of a road surface harrowing device (6), so as to realize the adjustment of the spraying width when the side harrowing frame (6-1) slides along the main harrowing frame.

6. The medium spreading system for hot-in-place recycling according to claim 1, characterized by The spraying rod linkage rod (4-4) is a spraying rod linkage rod (4-4) with adjustable length.

7. The medium spreading system for hot-in-place recycling according to claim 1, characterized in that, The length of the rotating spraying rod is 0.5-0.7m, and the swing angle is 0-80°.

8. A medium spreading method for hot-in-place recycling, characterized by, The system of any one of claims 1-7, the spraying method comprising: obtaining the host vehicle speed, and controlling the spraying amount of the spray head (4-5) according to the host vehicle speed, so that the spraying amount is linked with the host vehicle speed; obtaining the action frequency of the rotating spraying rod, and controlling the spraying pulse width according to the action frequency of the rotating spraying rod, so that the spraying of the spray head (4-5) starts and stops with the swing of the rotating spraying rod.

9. A paving machine characterized by, The system comprises the medium spraying system for in-place hot recycling according to any one of claims 1-7.

Images