Drying and preheating device for asphalt pavement repair

Abstract

The present application relates to the technical field of road construction, and discloses a drying and preheating device for asphalt pavement repair, which comprises a mounting frame, a drying and preheating unit mounted on the mounting frame, a surrounding unit and a blocking unit mounted on the drying and preheating unit; the drying and preheating unit comprises a blowing and heating component, a driving component and a transmission component; the blowing and heating component comprises two heating boxes which are symmetrically arranged; in the working state, the telescopic end of the electric cylinder of the driving component is elongated to drive the lifting frame to move downward, and under the guidance of the horizontal guide groove and the vertical guide groove, the two housings are converted from the vertical state to the horizontal state to meet the normal working requirements; after use, the telescopic end of the electric cylinder is retracted, the first guide wheel enters the vertical guide groove, the second guide wheel moves upward along the vertical guide groove to drive the housing to be turned over to the vertical state, thereby effectively reducing the overall width and volume of the device and saving the space for transfer.

Description

Technical Field

[0001] This invention relates to the technical field of road construction, and more particularly to a drying and preheating device for asphalt pavement repair. Background Technology

[0002] During the use of asphalt pavement, due to factors such as vehicle load and natural environment, the pavement is prone to damage such as cracks and potholes, which need to be repaired in time to ensure normal traffic. In asphalt pavement repair work, drying and preheating the old asphalt in the damaged area is one of the key steps. The purpose is to soften the old asphalt and restore its plasticity so that subsequent compaction or new thin-layer overlay materials (such as modified emulsified asphalt) can better penetrate and bond, ensuring that the repair achieves the specified density.

[0003] In asphalt pavement repair operations, traditional drying and preheating devices still have the following problems:

[0004] On the one hand, drying and preheating components typically employ a fixed installation structure. To meet the drying and preheating requirements of wider roads, the width of the drying and preheating components is relatively large to cover a sufficient working area. However, this design, especially during device transfer, results in significant limitations when passing through narrower road sections, alleys, or entering transport vehicles, and occupies more space during transfer, reducing transfer efficiency. On the other hand, the hot air from traditional devices diffuses severely during the heating process, lacking effective containment. A large amount of heat is lost to the surrounding environment and cannot be concentrated on the road surface to be repaired, leading to low heating efficiency and slow softening of old asphalt. This not only prolongs the repair operation time but also wastes energy. Therefore, it is necessary to provide a drying and preheating device for asphalt pavement repair to solve the above-mentioned technical problems. Summary of the Invention

[0005] To solve the above-mentioned technical problems, the present invention provides a drying and preheating device for asphalt pavement repair.

[0006] The present invention provides a drying and preheating device for asphalt pavement repair, comprising a mounting frame on which a drying and preheating unit is mounted, and a baffle unit and a sealing unit are mounted on the drying and preheating unit; the drying and preheating unit includes an air supply and heating component, a driving component, and a transmission component; the air supply and heating component includes a heating box, two of which are symmetrically arranged, a plurality of horizontal pipes communicating internally are fixedly connected to the bottom of the heating box, a plurality of vertical pipes communicating internally are fixedly connected to the bottom of the horizontal pipes, a shell is provided below the heating box, the bottom end of the vertical pipes passes through the shell and extends into its interior, the shell is fixedly connected to the outer wall of the vertical pipes, and a hot air outlet is slidably sleeved on the bottom end of the vertical pipes;

[0007] The driving component includes an electric cylinder, which is fixedly connected to the wall of the mounting frame. A lifting frame is fixedly connected to the telescopic end of the electric cylinder. Two horizontal shafts are symmetrically fixedly connected to both sides of the housing. One end of each horizontal shaft is rotatably connected to the lifting frame. A second guide wheel is rotatably mounted on the outer side of each horizontal shaft. Two first guide wheels are symmetrically rotatably connected to the outer side of the housing. Two horizontal guide grooves and two vertical guide grooves are symmetrically formed on both sides of the mounting frame. The first guide wheels are rolled within their corresponding horizontal guide grooves, and the second guide wheels are rolled within their corresponding vertical guide grooves. By driving the lifting frame to rise and fall with the electric cylinder, the two housings can be guided to switch between a horizontally extended state and a vertically retracted state relative to the mounting frame.

[0008] Preferably, the horizontal guide groove and the vertical guide groove are provided in a one-to-one correspondence, and one end of the horizontal guide groove is connected to the bottom end of the corresponding vertical guide groove.

[0009] Preferably, the transmission component includes a fixed base, with two bearing wheels symmetrically rotatably connected to the top of the fixed base, two connecting frames symmetrically fixedly connected to the mounting frame, an oblique guide and a vertical guide provided at the lower part of the connecting frame, and two vertical sliding rods symmetrically fixedly connected to the bottom of the fixed base. The vertical sliding rods slide through the housing and extend into its interior before being fixedly connected to a fixed frame, and the hot air nozzles are all fixedly connected to the frame wall of the fixed frame.

[0010] Preferably, a first spring is sleeved on the outer side of the vertical slide rod, the top end of the first spring is fixedly connected to the bottom of the fixed seat, and the bottom end of the first spring is fixedly connected to the top of the housing.

[0011] Preferably, the enclosure unit is provided in a one-to-one correspondence with the housing. The enclosure unit includes a side baffle. The lower outer side of the housing is fixedly connected to a hinge block that corresponds to the side baffle. The upper part of the side baffle is rotatably connected to the hinge block through a pin. One side baffle is provided on each of the three sides of the corresponding housing. A hinge rod is hinged to one side of the upper part of the side baffle. A lifting rod is hinged to the top of the hinge rod. A square hole corresponding to the lifting rod is opened through the side wall of the housing. One end of the lifting rod passes through the square hole and is fixedly connected to the frame wall of the fixed frame. A side baffle is fixedly sleeved on the outer side of the lifting rod.

[0012] Preferably, one side of the side baffle is slidably and sealingly fitted to the outer side wall of the housing, and the size of the side baffle is larger than the size of the square hole.

[0013] Preferably, the sealing unit includes a sealing component and a positioning and pressing component. The sealing component includes a sealing plate disposed at the bottom of the housing. The top surface of the sealing plate is slidably and sealingly fitted with the bottom surface of the housing. A slide rail is fixedly connected to the bottom of the sealing plate. A slide groove adapted to the slide rail is opened at the bottom of the housing. The slide rail is slidably disposed in the slide groove. Several through holes corresponding to and adapted to the hot air outlets are opened through the sealing plate. An avoidance groove is opened through the sealing plate. A pressing block is fixedly connected to the bottom of the sealing plate. A fixing block is slidably disposed inside the avoidance groove. The top of the fixing block is fixedly connected to the bottom of the housing.

[0014] Preferably, a second spring is provided between the extrusion block and the fixing block, one end of the second spring is fixedly connected to the side wall of the extrusion block, and the other end of the second spring is fixedly connected to the side wall of the fixing block.

[0015] Preferably, the positioning and pressing component includes a pressure block, the top of which is fixedly connected to one side of the bottom of the sealing plate, and the mounting bracket is fixedly connected with pressing plates that correspond one-to-one with the pressure block.

[0016] Preferably, a push rod is fixedly connected to one side of the mounting frame, and four traveling wheels are symmetrically fixedly installed on the lower outer side of the mounting frame; several air outlet holes are evenly opened through the bottom of the hot air outlet, several electric heating rods are evenly fixedly installed on the inner side of the heating box, several clearance holes are opened through the bottom of the shell, and several clearance holes are set one-to-one with the hot air outlet; a fan is fixedly installed on the frame wall of the mounting frame, and the air outlet end of the fan is connected to a three-way pipe. Both outlet ends of the three-way pipe are connected to flexible hoses, and each flexible hose is set one-to-one with a heating box. The bottom end of the flexible hose is connected to the corresponding heating box.

[0017] Compared with related technologies, the drying and preheating device for asphalt pavement repair provided by the present invention has the following beneficial effects:

[0018] 1. In this invention, during operation, the extension end of the electric cylinder of the drive component extends, driving the lifting frame to move downward. Under the guidance of the horizontal and vertical guide grooves, the two housings change from a vertical state to a horizontal state and unfold to meet normal operation requirements. After use, the extension end of the electric cylinder retracts, the first guide wheel enters the vertical guide groove, and the second guide wheel moves upward along the vertical guide groove, causing the housing to flip back to a vertical state. This effectively reduces the overall width and volume of the device, saves transfer space, facilitates operation and management, and thus better adapts to narrower road sections, alleys, or transport vehicles, improving transfer efficiency.

[0019] 2. During the retraction process, the bearing wheel of the transmission component contacts the inclined guide part of the connecting frame. The bearing wheel pulls the fixed seat, vertical slide rod and fixed frame to move, causing the hot air nozzle to retract into the housing, preventing the hot air nozzle from being exposed. Subsequently, the pressure block of the sealing unit contacts the extrusion plate, pushing the sealing plate to slide, so that the through hole and the clearance hole of the housing are completely misaligned. The sealing plate seals the clearance hole, which greatly reduces the risk of the hot air nozzle being damaged by collision and contaminated by impurities when not in use, and extends its service life.

[0020] 3. During operation, the side panels of the enclosure unit rotate around the hinge block to form an enclosure state under the action of the lifting rod and hinge rod driven by the fixed frame. The six side panels form an enclosure around the outside of the working area of ​​the hot air outlet, thereby enclosing all the hot air outlets on the inside, reducing the diffusion of hot air, and concentrating the heating of the road asphalt, thereby achieving the purpose of accelerating the softening of asphalt and saving heat energy.

[0021] 4. In the air supply and heating component, the fan delivers air to the heating box through a three-way pipe and a flexible hose. After being heated by the electric heating rod, the hot air enters the hot air outlet through the horizontal pipe and the vertical pipe in sequence, and is finally blown out from the air outlet, which quickly softens the old asphalt and improves the drying and preheating effect.

[0022] 5. The drying and preheating unit, the enclosure unit, and the sealing unit are linked through a mechanical structure. The extension and retraction of the electric cylinder can synchronously control the opening and closing of the shell, the extension and retraction of the hot air outlet, the opening and closing of the side baffles, and the sealing status of the sealing plate, making it more flexible and convenient to use. Attached Figure Description

[0023] Figure 1 A schematic diagram of the overall structure of the drying and preheating device for asphalt pavement repair provided by the present invention in its working state.

[0024] Figure 2 This is another perspective view of the drying and preheating device for asphalt pavement repair in this invention;

[0025] Figure 3 This is another perspective view of the drying and preheating device for asphalt pavement repair in this invention;

[0026] Figure 4 This is a schematic diagram of the structure of the mounting bracket in this invention;

[0027] Figure 5 This is a schematic diagram of the structure of the vertical tube in this invention;

[0028] Figure 6 This is a front view of the drying and preheating device for asphalt pavement repair in this invention;

[0029] Figure 7 In this invention Figure 2Enlarged view of point A;

[0030] Figure 8 This is a schematic diagram of the structure of the shell in this invention;

[0031] Figure 9 This is a schematic diagram of the structure of the fixing frame in this invention;

[0032] Figure 10 This is a partial structural diagram of the shell when it is adjusted to a vertical position in this invention;

[0033] Figure 11 This is a cross-sectional view of the drying and preheating device for asphalt pavement repair in this invention;

[0034] Figure 12 This is a schematic diagram of the structure of the sealing component in this invention;

[0035] Figure 13 This is a schematic diagram of the structure of the sealing plate in this invention;

[0036] Figure 14 This is a schematic diagram of the structure of the side baffle in this invention;

[0037] Figure 15 This is a schematic diagram of the structure at the clearance slot in this invention;

[0038] Figure 16 This is a schematic diagram of the overall structure of the drying and preheating device for asphalt pavement repair provided by the present invention in its retracted state.

[0039] Labels in the diagram: 1. Mounting bracket; 2. Push rod; 3. Traveling wheel; 4. Drying and preheating unit; 41. Air supply and heating component; 411. Heating box; 412. Horizontal pipe; 413. Vertical pipe; 414. Flexible hose; 415. T-pipe; 416. Fan; 417. Housing; 418. Clearance hole; 419. Hot air outlet; 4110. Air outlet; 4111. Electric heating rod; 42. Drive component; 421. Electric cylinder; 422. Lifting frame; 423. Horizontal guide groove; 424. Vertical guide groove; 425. First guide wheel; 426. Horizontal shaft; 427. Second guide wheel; 43. Transmission component; 431. Fixing 432. Supporting wheel; 433. Vertical slide bar; 434. First spring; 435. Connecting frame; 436. Inclined guide; 437. Vertical guide; 438. Fixing frame; 5. Enclosure unit; 511. Side baffle; 512. Hinge block; 513. Hinge rod; 514. Lifting rod; 515. Side baffle; 516. Square hole; 6. Sealing unit; 61. Sealing component; 611. Sealing plate; 612. Through hole; 613. Slide rail; 614. Clearance slot; 615. Extrusion block; 616. Second spring; 617. Fixing block; 62. Positioning extrusion component; 621. Pressure block; 622. Extrusion plate. Detailed Implementation

[0040] The present invention will be further described below with reference to the accompanying drawings and embodiments.

[0041] Example 1

[0042] Please refer to the following: Figures 1 to 11 A drying and preheating device for asphalt pavement repair includes a mounting frame 1. A push rod 2 is fixedly connected to one side of the mounting frame 1. Four traveling wheels 3 are symmetrically fixedly installed on the lower outer side of the mounting frame 1. The traveling wheels 3 are universal wheels with locking structures. A drying and preheating unit 4 is installed on the mounting frame 1. A enclosure unit 5 and a sealing unit 6 are installed on the drying and preheating unit 4. The drying and preheating unit 4 includes an air supply heating component 41, a driving component 42, and a transmission component 43. The air supply heating component 41 includes a heating box 411. Two heating boxes 411 are symmetrically arranged. Several horizontal pipes 412 with internal communication are fixedly connected to the bottom of the heating box 411. Several vertical pipes 413 with internal communication are fixedly connected to the bottom of the horizontal pipes 412. A shell 417 is provided below the heating box 411. The bottom end of the vertical pipe 413 passes through the shell 417 and extends into its interior. 17 is fixedly connected to the outer wall of the vertical pipe 413. The bottom end of the vertical pipe 413 is slidably fitted with a hot air outlet 419. A sealing ring is nested on the inner wall of the vertical pipe 413 to ensure the sealing performance between it and the inner wall of the hot air outlet 419. Several air outlet holes 4110 are evenly opened through the bottom end of the hot air outlet 419. Several electric heating rods 4111 are evenly fixedly installed on the inner side of the heating box 411. Several clearance holes 418 are opened through the bottom of the shell 417. Several clearance holes 418 are set one-to-one with the hot air outlet 419. A fan 416 is fixedly installed on the wall of the mounting bracket 1. The air outlet end of the fan 416 is connected to a three-way pipe 415. Both outlet ends of the three-way pipe 415 are connected to flexible hoses 414. Flexible hoses 414 are set one-to-one with the heating box 411. The bottom end of the flexible hose 414 is connected to the corresponding heating box 411.

[0043] In the above, the push rod 2 on one side of the mounting bracket 1 facilitates the operator to push the device, the four traveling wheels 3 facilitate the movement of the device, and the universal wheels with locking structure can fix the position of the device to ensure stability during operation. The horizontal pipe 412 and the vertical pipe 413 form a hot air delivery channel to transfer the hot air in the heating box 411 to the hot air outlet 419. The sealing ring on the inner wall of the vertical pipe 413 ensures the sealing when sliding with the hot air outlet 419 to reduce heat loss. The air outlet 4110 of the hot air outlet 419 allows the hot air to be blown out evenly, improving the heating effect. The electric heating rod 4111 provides a heat source for air heating. The clearance hole 418 provides space for the extension and retraction of the hot air outlet 419. The fan 416 delivers air into the heating box 411 through the three-way pipe 415 and the flexible hose 414. The flexible hose 414 can adapt to the movement of the shell 417. When the shell 417 moves, the flexible hose 414 can be bent.

[0044] Furthermore, the drive component 42 includes an electric cylinder 421, which is fixedly connected to the wall of the mounting frame 1. The telescopic end of the electric cylinder 421 is fixedly connected to a lifting frame 422. Two horizontal shafts 426 are symmetrically fixedly connected to both sides of the housing 417. One end of the horizontal shaft 426 is rotatably connected to the lifting frame 422. A second guide wheel 427 is rotatably sleeved on the outer side of the horizontal shaft 426. Two first guide wheels 425 are symmetrically rotatably connected to the outer side of the housing 417. Two horizontal guide grooves 423 and vertical guide grooves 424 are symmetrically opened on both sides of the mounting frame 1. The horizontal guide grooves 423 and vertical guide grooves 424 are arranged one-to-one. One end of the horizontal guide groove 423 is connected to the bottom end of the corresponding vertical guide groove 424. The first guide wheel 425 and the second guide wheel 427 are both rolled in the corresponding horizontal guide groove 423. The horizontal guide groove 423 and the vertical guide groove 424 are both adapted to the first guide wheel 425 and the second guide wheel 427.

[0045] In the above description, the electric cylinder 421 of the drive component 42 serves as a power source, driving the lifting frame 422 to rise and fall via the telescopic end, thereby controlling the movement of the housing 417. The horizontal shaft 426 connects the housing 417 to the lifting frame 422 and allows the housing 417 to rotate. The first guide wheel 425 and the second guide wheel 427 roll within the horizontal guide groove 423 and the vertical guide groove 424, guiding and limiting the housing 417, enabling the housing 417 to move smoothly from such a position. Figure 16 The vertical state shown is converted to as follows Figure 1 The lateral state shown, or from such Figure 1 The lateral state shown is transformed into as follows Figure 16 The vertical state shown.

[0046] Furthermore, the transmission component 43 includes a fixed base 431. Two bearing wheels 432 are symmetrically rotatably connected to the top of the fixed base 431. Two connecting frames 435 are symmetrically fixedly connected to the mounting frame 1. The lower part of the connecting frame 435 is provided with an oblique guide part 436 and a vertical guide part 437. An arc-shaped rounded corner is provided between the top end of the oblique guide part 436 and the bottom end of the vertical guide part 437. The bearing wheels 432 are adapted to the oblique guide part 436 and the vertical guide part 437. Two vertical sliding rods 433 are symmetrically fixedly connected to the bottom of the fixed base 431. The vertical sliding rods 433 slide through the housing 417 and extend into its interior before being fixedly connected to a fixed frame 438. Hot air nozzles 419 are all fixedly connected to the frame wall of the fixed frame 438. A first spring 434 is sleeved on the outside of the vertical sliding rod 433. The top end of the first spring 434 is fixedly connected to the bottom of the fixed base 431, and the bottom end of the first spring 434 is fixedly connected to the top of the housing 417.

[0047] In the above, the bearing wheel 432 of the transmission component 43 cooperates with the oblique guide part 436 and the vertical guide part 437 of the connecting frame 435. When the housing 417 moves, it drives the fixed seat 431 to move. The vertical slide rod 433 connects the fixed seat 431 and the fixed frame 438, so that the fixed frame 438 moves synchronously with the fixed seat 431, thereby controlling the extension and retraction of the hot air nozzle 419. When the bearing wheel 432 disengages from the oblique guide part 436, the first spring 434 can pull the fixed seat 431 back to its original position, so that the hot air nozzle 419 extends out of the housing 417 to perform operations. The rounded corners allow the bearing wheel 432 to smoothly transition from the oblique guide part 436 to the vertical guide part 437, ensuring smooth transmission.

[0048] Example 2

[0049] For further details, please refer to [link / reference]. Figures 1 to 14 Based on Embodiment 1, the enclosure unit 5 is configured one-to-one with the housing 417. The enclosure unit 5 includes a side baffle 511. The lower outer side of the housing 417 is fixedly connected to a hinge block 512 that corresponds to the side baffle 511. The upper part of the side baffle 511 is rotatably connected to the hinge block 512 through a pin. There is one side baffle 511 on each of the three sides of the corresponding housing 417. The side where the two housings 417 are close together is not provided with a side baffle 511. A hinge rod 513 is hinged to the upper side of the side baffle 511. A lifting rod 514 is hinged to the top of the hinge rod 513. A square hole 516 corresponding to the lifting rod 514 is opened through the side wall of the housing 417. One end of the lifting rod 514 passes through the square hole 516 and is fixedly connected to the frame wall of the fixed frame 438. A side baffle 515 is fixedly sleeved on the outer side of the lifting rod 514.

[0050] In the above, the side baffle 511 of the enclosure unit 5 is rotatably connected to the housing 417 through the hinge block 512, which enables the side baffle 511 to rotate. The hinge rod 513 and the lifting rod 514 transmit the movement of the fixing frame 438 to the side baffle 511, so that the side baffle 511 can open and close synchronously with the extension and retraction of the hot air outlet 419. The side of the two housings 417 that are close together does not have a side baffle 511 to avoid mutual interference. The square hole 516 provides movement space for the lifting rod 514. The side baffle 515 ensures the sealing of the square hole 516, prevents hot air from leaking from the square hole 516, and improves heating efficiency.

[0051] Furthermore, one side of the side baffle 515 is slidably and sealingly fitted with the outer wall of the housing 417. The size of the side baffle 515 is larger than the size of the square hole 516. During the lifting process of the lifting rod 514, the side baffle 515 can keep the square hole 516 blocked.

[0052] In the above, the side baffle 515 slides and seals against the outer wall of the housing 417, and its size is larger than that of the square hole 516. During the lifting and lowering process of the lifting rod 514, it can always block the square hole 516, effectively preventing the hot air in the housing 417 from escaping from the square hole 516, ensuring that the hot air is concentrated on the road surface heating area and enhancing the drying and preheating effect.

[0053] Example 3

[0054] For further details, please refer to [link / reference]. Figures 1 to 15 Based on Embodiment 2, the sealing unit 6 includes a sealing component 61 and a positioning and pressing component 62. The sealing component 61 includes a sealing plate 611, which is disposed at the bottom of the housing 417. The top surface of the sealing plate 611 is slidably and sealingly fitted with the bottom surface of the housing 417. A slide rail 613 is fixedly connected to the bottom of the sealing plate 611. A slide groove adapted to the slide rail 613 is opened at the bottom of the housing 417. The slide rail 613 is slidably disposed in the slide groove. Several through holes 612 are opened through the sealing plate 611, which are corresponding to and adapted to the hot air outlet 419. An avoidance groove 614 is opened through the sealing plate 611. A pressing block 615 is fixedly connected to the bottom of the sealing plate 611. A fixing block 617 is slidably disposed on the inner side of the avoidance groove 614. The top of the fixing block 617 is fixedly connected to the bottom of the housing 417.

[0055] In the above, the sealing plate 611 of the sealing component 61 slides and seals against the bottom of the housing 417, and the sealing and opening of the clearance hole 418 are achieved by sliding. The slide rail 613 and the slide groove cooperate to ensure that the sealing plate 611 slides smoothly and restricts the movement direction of the sealing plate 611. The through hole 612 cooperates with the hot air outlet 419 during operation to allow it to extend. When not in operation, it is offset from the clearance hole 418, so that the sealing plate 611 can block the clearance hole 418. The clearance groove 614 provides movement space for the fixed block 617. The pressing block 615 and the second spring 616 reset the sealing plate 611 when it is not subjected to external force.

[0056] Furthermore, a second spring 616 is provided between the extrusion block 615 and the fixing block 617. One end of the second spring 616 is fixedly connected to the side wall of the extrusion block 615, and the other end of the second spring 616 is fixedly connected to the side wall of the fixing block 617.

[0057] In the above, the second spring 616 connects the pressing block 615 and the fixing block 617. After the pressing block 621 is separated from the pressing plate 622, it can use elastic potential energy to push the sealing plate 611 to reset, so that the through hole 612 is aligned with the clearance hole 418, which facilitates the hot air outlet 419 to extend for operation. When the pressing block 621 is squeezed, it can be compressed, allowing the sealing plate 611 to slide to achieve sealing.

[0058] Furthermore, the positioning and pressing component 62 includes a pressure block 621, the top of which is fixedly connected to one side of the bottom of the sealing plate 611, and a pressing plate 622 corresponding to the pressure block 621 is fixedly connected to the mounting bracket 1.

[0059] In the above, the pressure block 621 of the positioning and pressing component 62 is connected to the sealing plate 611, and the pressing plate 622 is fixed on the mounting bracket 1. The two work together to push the sealing plate 611 to slide when the housing 417 rises, thereby sealing the clearance hole 418 and protecting the hot air outlet 419. When the housing 417 falls, the pressure block 621 disengages from the pressing plate 622, causing the sealing plate 611 to reset, ensuring the normal operation of the device and realizing automatic control of the sealing action.

[0060] Furthermore, a battery and a switch are also fixedly installed on the mounting bracket 1. The fan 416, the electric heating rod 4111 and the electric cylinder 421 are all electrically connected to the switch through wires. The switch is electrically connected to the battery through wires. The battery supplies power to the entire device, and the switch controls the operation of the fan 416, the electric heating rod 4111 and the electric cylinder 421.

[0061] In the above, the battery on the mounting bracket 1 provides power to the device, ensuring normal operation in road working environments without external power supply. The switch centrally controls the fan 416, electric heating rod 4111 and electric cylinder 421, making operation simple and convenient for operators to flexibly control the working status of each component according to the work requirements, thus improving the ease of use of the device.

[0062] The working principle of the drying and preheating device for asphalt pavement repair provided by this invention is as follows:

[0063] When the electric cylinder 421 is activated, its telescopic end retracts, causing the lifting frame 422 to move upward. This upward movement of the lifting frame 422 drives the horizontal shaft 426, causing the second guide wheel 427 to move upward along the vertical guide groove 424. Simultaneously, the first guide wheel 425 moves within the horizontal guide groove 423 towards the end closest to the vertical guide groove 424. As the first guide wheel 425 and the second guide wheel 427 move, the two housings 417 begin to flip from their horizontal position. Once the first guide wheel 425 enters the vertical guide groove 424, the housing 417... 17. When flipped to the vertical position, as the telescopic end of the electric cylinder 421 continues to retract, the bearing wheel 432 contacts the inclined guide part 436 and is guided by the inclined guide part 436, causing the bearing wheel 432 to move towards the electric cylinder 421. During the movement of the bearing wheel 432 on the inclined guide part 436, it pulls the fixed seat 431, the vertical slide rod 433 and the fixed frame 438 to move. The first spring 434 is stretched. As the fixed frame 438 moves, it can drive all the hot air nozzles 419 to move synchronously into the housing 417.

[0064] Furthermore, as the fixed frame 438 moves, it drives the lifting rod 514 to move synchronously, causing the lifting rod 514 to slide within the square hole 516. The side baffle 515 always remains on the outside of the housing 417, blocking the square hole 516. The lifting rod 514 pulls the hinge rod 513, causing the side baffle 511 to rotate. The side baffle 511 rotates along the rotation point connected to the hinge block 512, thereby adjusting the side baffle 511 from a state of enclosure parallel to the side of the housing 417 to an unfolded state perpendicular to the side of the housing 417. At this time, the side baffle 511 does not block the pressure block 621. At this time, the bearing wheel 432 moves from the inclined guide part 436 to the vertical guide part 437. The housing 417 is parallel to the vertical guide part 437, so the bearing wheel 432 moves to the maximum distance from the housing 417, keeping the side baffle 511 in the unfolded state.

[0065] As the housing 417 continues to move upward, the pressure block 621 contacts the corresponding extrusion plate 622, and the extrusion plate 622 obstructs the pressure block 621. Meanwhile, the electric cylinder 421 continues to retract, and the pressure block 621 prevents the sealing plate 611 from moving upward. The sealing plate 611 remains at its current height and no longer moves. The housing 417 continues to move upward, and the housing 417 drives the fixing block 617 to move upward, compressing the second spring 616 and causing the second spring 616 to undergo elastic deformation. At this time, the through hole 612 and the clearance hole 418 are completely misaligned, and the sealing plate 611 blocks the clearance hole 418, thereby protecting the hot air outlet 419 inside the housing 417.

[0066] During this process, the two housings 417 remain in a vertical position, which reduces the width of the entire device and thus reduces its volume, making it easier for operators to move the device.

[0067] Pushing the push rod 2 causes the traveling wheel 3 to rotate, moving the device to the asphalt pavement area requiring drying and preheating before stopping. Then, the telescopic end of the electric cylinder 421 extends, causing the housing 417 to move downwards. When the pressure block 621 separates from the extrusion plate 622, the elastic potential energy of the second spring 616 is released, causing the sealing plate 611 to reset. At this point, the through hole 612 and the clearance hole 418 correspond one-to-one. As the housing 417 continues to move downwards, the bearing wheel 432 moves downwards along the vertical guide portion 437, and then along the inclined guide portion 436. Until it disengages from the inclined guide 436, the elastic potential energy of the first spring 434 is released, pulling the fixed seat 431 back to its original position. The fixed seat 431 drives the fixed frame 438 to move synchronously, so that the end of the hot air nozzle 419 with the air outlet 4110 extends out of the housing 417 through the clearance hole 418 and the through hole 612 in sequence. At the same time, the three side baffles 511 installed on the housing 417 change from the unfolded state to the enclosing state again. The six side baffles 511 on the two housings 417 work together to enclose the hot air nozzle 419 inside.

[0068] Subsequently, the blower 416 and the electric heating rod 4111 are started. The blower 416 delivers air into the heating box 411 through the three-way pipe 415 and the hose 414. The electric heating rod 4111 heats the air entering the heating box 411 to the temperature required for asphalt drying and preheating. Then, the hot air in the heating box 411 enters the hot air outlet 419 through the horizontal pipe 412 and the vertical pipe 413, and finally flows out through the air outlet 4110 to contact the asphalt on the bottom surface, drying and preheating the asphalt, softening the old asphalt, and restoring its plasticity. Then, the device is removed, and the asphalt is repressurized or a new thin layer of modified emulsified asphalt is laid as a surface material, which can better penetrate and bond, ensuring that the specified density is achieved.

[0069] The above description is merely an embodiment of the present invention and does not limit the patent scope of the present invention. Any equivalent structural or procedural transformations made based on the content of the present invention specification and drawings, or direct or indirect applications in other related technical fields, are similarly included within the patent protection scope of the present invention.

Claims

1. A drying preheating device for asphalt pavement repair, comprising a mounting frame (1), characterized in that, The mounting frame (1) is equipped with a drying and preheating unit (4); The drying and preheating unit (4) includes an air supply heating component (41), a driving component (42), and a transmission component (43). The air supply heating component (41) includes a heating box (411), two heating boxes (411) are symmetrically arranged, and each heating box (411) has several horizontal pipes (412) that communicate with its interior fixedly connected to its bottom. The bottom of each horizontal pipe (412) has several vertical pipes (413) that communicate with its interior fixedly connected to its bottom. Each heating box (411) has a shell (417) respectively provided below it. The bottom end of the vertical tube (413) passes through the corresponding housing (417) and extends into its interior. The housing (417) is fixedly connected to the outer wall of the vertical tube (413). A hot air outlet (419) is slidably sleeved on the bottom end of the vertical tube (413). The driving component (42) includes an electric cylinder (421), which is fixedly connected to the wall of the mounting frame (1). The telescopic end of the electric cylinder (421) is fixedly connected to a lifting frame (422). Two horizontal shafts (426) are symmetrically fixedly connected to both sides of the housing (417). One end of the horizontal shaft (426) is rotatably connected to the lifting frame (422). A second guide wheel (427) is rotatably sleeved on the outer side of the horizontal shaft (426). Two guide wheels (427) are symmetrically rotatably connected to the outer side of the housing (417). The first guide wheel (425) has two horizontal guide grooves (423) and two vertical guide grooves (424) symmetrically opened on both sides of the mounting frame (1); the first guide wheel (425) is rolled in the corresponding horizontal guide groove (423), and the second guide wheel (427) is rolled in the corresponding vertical guide groove (424); the lifting frame (422) is driven to rise and fall by the electric cylinder (421), which can guide the two housings (417) to switch between the horizontally unfolded state and the vertically retracted state relative to the mounting frame (1).

2. The drying preheating device for asphalt pavement repair according to claim 1, characterized in that, The horizontal guide groove (423) and the vertical guide groove (424) are provided in a one-to-one correspondence, and one end of the horizontal guide groove (423) is connected to the bottom end of the corresponding vertical guide groove (424).

3. The drying preheating device for asphalt pavement repair according to claim 2, characterized in that, The transmission component (43) includes a fixed base (431), with two bearing wheels (432) symmetrically rotatably connected to the top of the fixed base (431). Two connecting frames (435) are symmetrically fixedly connected to the mounting frame (1). The lower part of the connecting frame (435) is provided with an inclined guide (436) and a vertical guide (437). Two vertical sliding rods (433) are symmetrically fixedly connected to the bottom of the fixed base (431). The vertical sliding rods (433) slide through the housing (417) and extend into its interior before being fixedly connected to a fixed frame (438). The hot air nozzles (419) are all fixedly connected to the frame wall of the fixed frame (438).

4. The drying preheating device for asphalt pavement repair according to claim 3, characterized in that, The outer side of the vertical slide bar (433) is fitted with a first spring (434). The top end of the first spring (434) is fixedly connected to the bottom of the fixed seat (431), and the bottom end of the first spring (434) is fixedly connected to the top of the housing (417). It is used to pull the fixed seat (431) back to its original position when the pull wheel (432) is disengaged from the inclined guide (436).

5. The drying preheating device for asphalt pavement repair according to claim 4, characterized in that, A baffle unit (5) is installed on the drying and preheating unit (4); the baffle unit (5) is arranged one-to-one with the shell (417), the baffle unit (5) includes a side baffle (511), and a hinge block (512) is fixedly connected to the lower outer side of the shell (417) and is arranged one-to-one with the side baffle (511). The upper part of the side baffle (511) is rotatably connected to the hinge block (512) through a pin. The side baffle (511) is located on the three sides of the corresponding shell (417). Each is provided with a hinge rod (513) hinged to one side of the upper part of the side baffle (511), and a lifting rod (514) hinged to the top of the hinge rod (513). A square hole (516) corresponding to the lifting rod (514) is provided through the side wall of the housing (417). One end of the lifting rod (514) passes through the square hole (516) and is fixedly connected to the frame wall of the fixed frame (438). A side baffle (515) is fixedly sleeved on the outside of the lifting rod (514).

6. The drying preheating device for asphalt pavement repair according to claim 5, characterized in that, One side of the side baffle (515) is slidably and sealed against the outer wall of the housing (417), and the size of the side baffle (515) is larger than the size of the square hole (516).

7. The drying preheating device for asphalt pavement repair according to claim 1, characterized in that, A sealing unit (6) is installed on the drying and preheating unit (4). The sealing unit (6) includes a sealing component (61) and a positioning and pressing component (62). The sealing component (61) includes a sealing plate (611). The sealing plate (611) is disposed at the bottom of the housing (417). The top surface of the sealing plate (611) is slidably and sealingly fitted with the bottom surface of the housing (417). A slide rail (613) is fixedly connected to the bottom of the sealing plate (611). The bottom of the housing (417) is provided with a section that is compatible with the slide rail (613). The slide rail (613) is slidably disposed in the slide rail. The sealing plate (611) has several through holes (612) that correspond to and are adapted to the hot air outlet (419). The sealing plate (611) has a through clearance slot (614). The bottom of the sealing plate (611) is fixedly connected to a pressing block (615). A fixing block (617) is slidably disposed on the inner side of the clearance slot (614). The top of the fixing block (617) is fixedly connected to the bottom of the housing (417).

8. The drying and preheating device for asphalt pavement repair according to claim 7, characterized in that, A second spring (616) is provided between the extrusion block (615) and the fixing block (617). One end of the second spring (616) is fixedly connected to the side wall of the extrusion block (615), and the other end of the second spring (616) is fixedly connected to the side wall of the fixing block (617).

9. The drying preheating device for asphalt pavement repair according to claim 7, characterized in that, The positioning and pressing component (62) includes a pressure block (621), the top of which is fixedly connected to one side of the bottom of the sealing plate (611), and the mounting bracket (1) is fixedly connected with a pressing plate (622) that corresponds to the pressure block (621).

10. The drying preheating device for asphalt pavement repair according to claim 1, characterized in that, A push rod (2) is fixedly connected to one side of the mounting frame (1), and four walking wheels (3) are symmetrically fixedly installed on the lower outer side of the mounting frame (1); several air outlets (4110) are evenly opened through the bottom end of the hot air outlet (419), several electric heating rods (4111) are evenly fixedly installed on the inner side of the heating box (411), several clearance holes (418) are evenly opened through the bottom of the shell (417), and several clearance holes (418) are set one-to-one with the hot air outlet (419). A fan (416) is fixedly installed on the frame wall of the mounting frame (1), and a three-way pipe (415) is connected to the air outlet end of the fan (416). Both outlet ends of the three-way pipe (415) are connected to flexible hoses (414), and the flexible hoses (414) are set one-to-one with the heating box (411). The bottom end of the flexible hose (414) is connected to the corresponding heating box (411).

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