Intelligent crack repairing method and repairing device based on microwave heating

Abstract

The application discloses an intelligent crack repairing method and a repairing device based on microwave heating, belongs to the technical field of microwave technology application, and the repairing method is to use microwave heating to repair materials, and the melted repairing materials are poured into the cracks of the asphalt pavement; the crack repairing device uses the repairing method to repair the cracks of the asphalt pavement. The microwave heating technology is used for repairing the cracks in the deep inside, so that the repairing effect is improved, and the secondary disease risk caused by incomplete repairing of the cracks is remarkably reduced; the maintenance vehicle is used for automatically repairing the cracks on the asphalt pavement, and the operation is flexible and convenient, and the automatic and intelligent characteristics are achieved. The microwave heating technology is applied to the road and bridge field, so that the shortcomings of the traditional crack sealing tapes are changed, and the maintenance efficiency and quality are improved.

Description

Technical Field

[0001] This invention belongs to the field of microwave technology application technology, and specifically relates to an intelligent crack repair method and device based on microwave heating. Background Technology

[0002] Against the backdrop of China's continuous advancement in transportation infrastructure construction and maintenance, highway maintenance has become particularly important. Currently, my country's total highway mileage has reached 5.441 million kilometers, including 184,000 kilometers of expressways. This vast road network places higher demands on highway maintenance. Road surface cracks, as one of the main problems affecting road lifespan and driving safety, require more efficient and environmentally friendly maintenance technologies to address. With technological advancements, the country has placed higher demands on promoting the digital transformation of highways and accelerating the development of smart highways, thus creating new expectations and requirements for the intelligent upgrading of highway maintenance equipment.

[0003] Currently, traditional road maintenance methods, such as hot and cold crack sealing technologies, while solving the problem of road crack repair to some extent, have limitations in terms of durability, construction efficiency, and environmental friendliness. Therefore, there is an urgent market demand for a new technology that can provide a more efficient maintenance solution. Summary of the Invention

[0004] To address the above problems, this invention provides an intelligent crack repair method and device based on microwave heating.

[0005] To achieve the above objectives, the technical solution adopted by the present invention is as follows:

[0006] An intelligent crack repair method based on microwave heating includes the following steps:

[0007] Microwave heating is used to heat the repair material, and the melted repair material is then poured into the cracks in the asphalt pavement.

[0008] The simulation calculations for the heat energy released by microwaves absorbed by the repair material are as follows:

[0009] (1)

[0010] In the formula, ρ is the density of the asphalt mixture, kg / m³. 3 t is the microwave heating time, in seconds; T is the heating temperature of the asphalt mixture, in degrees Celsius. T represents the temperature gradient, in °C / m; For the Laplace operator; The specific heat capacity of constant-pressure asphalt mixture, J / ( u is the velocity field defined by the translational motion sub-nodes, in m / s; q is the conduction heat flux vector. The power dissipated by microwaves is expressed in kW.

[0011] The repair material consists of mineral powder and SBS modified bitumen, with a mass ratio of 6:10. The mineral powder and SBS modified bitumen are mixed to form a paste.

[0012] Furthermore, a waveguide connected to a microwave generator is used to radiate microwaves. The waveguide is installed at the bottom of the maintenance vehicle, and the repair material is attached to the joint sealing tape. The relationship between the microwave heating power and the speed of the maintenance vehicle is as follows:

[0013] (2)

[0014] In the formula, is the conversion factor; W is the electrical energy consumed by the microwave generator, kW·h; The specific heat capacity of constant-pressure asphalt mixture, J / ( h is the thickness of the sealing tape, in mm; b is the width of the sealing tape, in mm;

[0015] The joint sealing tape consists of an anti-sticking layer, an adhesive layer, and a release layer from top to bottom. The anti-sticking layer is made of fine aggregate with a particle size of no more than 0.3 mm, which is evenly spread on the upper surface of the adhesive layer. The release layer is a metal grid, which is made of metal powder coated on the lower surface of the adhesive layer in a mesh pattern of no less than 0.4 mm.

[0016] This invention also provides an intelligent crack repair device based on microwave heating. The device repairs cracks in asphalt pavement using the aforementioned intelligent crack repair method based on microwave heating. The device includes a maintenance vehicle, a crack sealing tape unwinding assembly, a cutting assembly, and a microwave heating assembly. The unwinding assembly and the microwave heating assembly are respectively located at the front and rear of the maintenance vehicle. The cutting assembly is located on the side of the unwinding assembly and is used to cut the crack sealing tape. The maintenance vehicle is equipped with a control panel, and the unwinding assembly, microwave heating assembly, and cutting assembly are all connected to the control panel. The maintenance vehicle can travel along the crack, the unwinding assembly can release the crack sealing tape and lay it at the crack, and the microwave heating assembly can melt the crack sealing tape into the crack.

[0017] Furthermore, the seam sealing tape unwinding assembly includes a gear shaft for winding the coated seam sealing tape, a take-up shaft for winding the release liner, and a pre-pressure roller for sealing the seam. The gear shaft is connected to a permanent magnet speed regulator, the gear shaft is connected to the pre-pressure roller via a chain, and the gear shaft is connected to the take-up shaft via a gear set. The cutting assembly is located on the front side of the pre-pressure roller. The axle of the pre-pressure roller is connected to the top of the maintenance vehicle via a first spring. After the release liner is applied to one side of the seam sealing tape, it is wound onto the gear shaft. The end of the seam sealing tape is wound onto the pre-pressure roller, and the end of the release liner is wound onto the take-up shaft. During the movement of the maintenance vehicle, the pre-pressure roller presses the seam sealing tape onto the crack, while the release liner is simultaneously wound onto the take-up shaft.

[0018] Furthermore, the cutting assembly is a thermal resistance wire cutter connected to the control panel, and the thermal resistance wire cutter is rotatably connected to the floor of the maintenance vehicle.

[0019] Furthermore, an anti-drop component is provided above the thermal resistance wire cutter. The anti-drop component includes a pressure rod and an arc-shaped pressure plate. The lower end of the pressure rod is rotatably connected to the bottom plate of the maintenance vehicle through a torsion spring. The upper end of the pressure rod is connected to the arc-shaped pressure plate. The cross-section of the arc-shaped pressure plate is a U-shape that matches the outer circle of the pre-pressure wheel. Under the elastic force of the torsion spring, the arc-shaped pressure plate can press the sealing tape onto the pre-pressure wheel. The upper end of the arc-shaped pressure plate is provided with a trumpet-shaped inlet.

[0020] Furthermore, the microwave heating assembly includes a waveguide, a second spring, and a metal mesh. The waveguide is connected to a microwave generator, with its open end facing the ground. The top of the waveguide is connected to the top of the maintenance vehicle via the second spring, and the metal mesh is disposed at the open end of the waveguide.

[0021] Furthermore, the maintenance vehicle is equipped with a microwave power regulator for adjusting microwave power, which is connected to the microwave generator and control panel.

[0022] Furthermore, the maintenance vehicle is equipped with a laser sight and camera at the front for identifying cracks, and sensors at the rear for monitoring the repair of road cracks; the maintenance vehicle is also equipped with an alarm.

[0023] Furthermore, the maintenance vehicle is equipped with a steering rod on its top, which is connected to a steering mechanism at the bottom of the maintenance vehicle, and the direction of travel of the maintenance vehicle is controlled by the steering rod.

[0024] The technological advancements achieved by this invention compared to existing technologies are as follows:

[0025] Compared to traditional crack sealing techniques, this invention uses microwaves to heat the repair material, allowing the melted material to penetrate deep into the crack. This not only improves the repair effect but also significantly reduces the risk of secondary damage caused by incomplete crack repair. Furthermore, this invention utilizes a maintenance vehicle for automated crack repair on asphalt pavements, offering flexible and convenient operation with automation and intelligence features, aligning with national requirements for green and intelligent development of transportation infrastructure maintenance. This invention applies microwave heating technology to the road and bridge construction field, enabling deep crack repair and overcoming the shortcomings of traditional crack sealing tape while improving maintenance efficiency and quality. Attached Figure Description

[0026] The accompanying drawings are provided to further illustrate the invention and form part of the specification. They are used together with the embodiments of the invention to explain the invention and do not constitute a limitation thereof.

[0027] In the attached diagram:

[0028] Figure 1 This is a schematic diagram of the seam tape used in an embodiment of the present invention;

[0029] Figure 2 A schematic diagram of the structure of an intelligent crack repair device based on microwave heating provided in an embodiment of the present invention;

[0030] Figure 3 This is a comparison diagram showing the effects of microwave grouting and traditional grouting methods in this invention.

[0031] In the picture:

[0032] 00-Seam sealing tape, 1-Anti-adhesive layer, 2-Adhesive layer, 3-Release layer; 01-Release film;

[0033] 4-Maintenance vehicle; 5-Cutting assembly; 6-Control panel; 7-Gear shaft; 8-Recovery shaft; 9-Preload wheel; 10-Permanent magnet speed controller; 11-Gear set; 12-First spring; 13-Pressure rod; 14-Arc-shaped pressure plate; 15-Waveguide; 16-Second spring; 17-Metal mesh; 18-Door; 19-Microwave power controller; 20-Laser sight; 21-Camera; 22-Sensor; 23-Steering rod; 24-Handrail; 25-Wheel; 26-First guide rod; 27-Second guide rod; 28-Housing. Detailed Implementation

[0034] The following specific embodiments can be combined with each other, and the same or similar concepts or processes may not be described again in some embodiments. The embodiments of the present invention will now be described with reference to the accompanying drawings.

[0035] like Figure 1 , Figure 2 and Figure 3 As shown, an intelligent crack repair method based on microwave heating includes the following steps:

[0036] The repair material is heated by microwaves, and the melted material is then poured into the cracks in the asphalt pavement.

[0037] Microwave heating is a type of heating that penetrates the interior of an object, simultaneously raising the temperature of the entire object. It differs completely from other conventional heating methods. Microwave heating generates "internal friction heat" through the high-frequency reciprocating motion of dipole molecules within the heated material. It requires no heat conduction and heats the material simultaneously, both internally and externally, rapidly and uniformly, requiring only a fraction of the energy of traditional heating methods. Theoretically, the amount of heat generated by a substance in a microwave field is highly dependent on the type of substance and its dielectric properties; that is, microwaves exhibit selective heating characteristics.

[0038] The simulation calculations for the heat energy released by microwaves absorbed by the repair material are as follows:

[0039] (1)

[0040] In the formula, ρ is the density of the asphalt mixture, kg / m³. 3 t is the microwave heating time, in seconds; T is the heating temperature of the asphalt mixture, in degrees Celsius. T represents the temperature gradient, in °C / m; For the Laplace operator; The specific heat capacity of constant-pressure asphalt mixture, J / ( u is the velocity field defined by the translational motion sub-nodes, in m / s; q is the conduction heat flux vector. The power dissipated by microwaves is expressed in kW.

[0041] The repair material used in this invention consists of mineral powder and SBS modified bitumen, with a mass ratio of 6:10. The mineral powder and SBS modified bitumen are mixed to form a paste. The mineral powder incorporated into the SBS modified bitumen absorbs microwave heat, rapidly heating and melting the paste. The mineral powder used is made from solid waste materials, such as iron tailings or iron slag, which are rich in ferrite and act as microwave-absorbing materials. Pre-treatment of the solid waste material's surface improves the adhesion between the SBS modified bitumen and the solid waste material.

[0042] Meanwhile, the properties of SBS modified asphalt are shown in the table below:

[0043]

[0044] In practical applications, a waveguide 15 connected to a microwave generator radiates microwaves. The waveguide 15 is installed at the bottom of the maintenance vehicle 4, and the repair material is attached to the crack sealing tape 00. The maintenance vehicle 4 can repair cracks in the asphalt pavement while it is in motion. The waveguide 15 is flared, wider at the bottom and narrower at the top. The microwave generator operates at 915MHz, and the crack sealing tape is heated as needed based on the vehicle's speed, thereby injecting asphalt grout into the cracks. The relationship between the microwave heating power and the speed of the maintenance vehicle 4 is as follows:

[0045] (2)

[0046] In the formula, is the conversion factor; W is the electrical energy consumed by the microwave generator, kW·h; The specific heat capacity of constant-pressure asphalt mixture, J / ( h is the thickness of the sealing tape, in mm; b is the width of the sealing tape, in mm.

[0047] By controlling the speed of the maintenance vehicle, the power of the microwave generator can be adjusted to repair cracks of different sizes and depths, thereby achieving the purpose of road maintenance.

[0048] like Figure 1 As shown, the structure of the joint sealing tape 00, from top to bottom, consists of an anti-adhesion layer 1, an adhesive layer 2, and an isolation layer 3. The anti-adhesion layer 1 is made of fine aggregate with a particle size of 0.3 mm, which is evenly sprinkled on the upper surface of the adhesive layer 2. The isolation layer 3 is a metal grid, made of metal powder coated on the lower surface of the adhesive layer in a mesh pattern of not less than 0.4 mm. The mesh-like metal powder can partially reflect microwaves, thereby increasing the microwave absorption effect of the asphalt in the joint sealing tape. At the same time, the metal grid (0.4 mm) also serves to isolate microwaves and prevent microwave leakage. The mineral powder added to the middle layer of the joint sealing tape can be made of solid waste material, which has microwave absorption properties. After the adhesive layer reaches its melting point through microwave heating, it gradually penetrates into the cracks, such as... Figure 3 As shown. At the same time, because microwaves have a certain range, the asphalt pavement near the crack will also be heated, thereby reducing the surface tension between the asphalt and the crack surface, increasing the wetting effect between the asphalt and the crack, promoting the capillary action of the asphalt in the crack, and thus achieving multi-directional deep repair, so that the asphalt can flow down smoothly and evenly to achieve the purpose of repairing the crack.

[0049] This invention also provides an intelligent crack repair device based on microwave heating, such as... Figure 2As shown, the crack repair device uses the aforementioned intelligent crack repair method based on microwave heating to repair cracks in asphalt pavement. The device includes a maintenance vehicle 4, a crack sealing tape unwinding assembly, a cutting assembly 5, and a microwave heating assembly. The crack sealing tape unwinding assembly and the microwave heating assembly are respectively located at the front and rear of the maintenance vehicle 4. The cutting assembly 5 is located on the side of the crack sealing tape unwinding assembly and is used to cut the crack sealing tape 00. The maintenance vehicle 4 is equipped with a control panel 6, to which the crack sealing tape unwinding assembly, the microwave heating assembly, and the cutting assembly 5 are all connected. The maintenance vehicle 4 can travel along the crack. The crack sealing tape unwinding assembly can release the crack sealing tape 00 and lay it at the crack. The microwave heating assembly can melt the crack sealing tape 00 into the crack. During operation, the display screen on the control panel allows staff to easily adjust the speed of the maintenance vehicle.

[0050] As a preferred structure, such as Figure 2 As shown, the seam sealing tape unwinding assembly includes a gear shaft 7 for winding the film-coated seam sealing tape, a recovery shaft 8 for winding the release film, and a pre-pressure wheel 9 for sealing the seam. The gear shaft 7 is connected to a permanent magnet speed regulator 10, which applies external force to the gear shaft to prevent the seam sealing tape from falling off. The gear shaft 7 is connected to the pre-pressure wheel 9 via a chain (not shown in the figure), and the gear shaft 7 is connected to the recovery shaft 8 via a gear set 11. The cutting assembly 5 is located on the front side of the pre-pressure wheel 9. The axle of the pre-pressure wheel 9 is connected to the top of the housing 28 of the maintenance vehicle 4 via a first spring 12. After the release film 01 is applied to one side of the anti-stick layer of the seam sealing tape 00, it is wound onto the gear shaft 7. The end of the seam sealing tape 00 is wound onto the pre-pressure wheel 9, and the end of the release film 01 is wound onto the recovery shaft 8. During the operation of the maintenance vehicle 4, the pre-pressure wheel 9 presses the seam sealing tape 00 onto the crack, while the release film 01 is simultaneously wound onto the recovery shaft 8. The release liner is made of reusable silicon-based film. This structure links the gear shaft that collects the silicon-based release liner with the pre-loading wheel shaft that applies the sealant, ensuring that the sealant tape and release liner separate synchronously. During the maintenance vehicle's journey, the pre-loading wheel applies the sealant tape to the cracks in the road surface. Then, a microwave generator is activated to heat the sealant, melting it and allowing it to penetrate into the cracks, thus repairing the road surface.

[0051] During installation, the first spring 12 is fitted onto the first guide rod 26, and the upper end of the first guide rod 26 is connected to the top of the housing 28 of the maintenance vehicle 4. The first spring provides preload to the preload wheel to ensure that the sealing tape is tightly attached to the road surface.

[0052] In the specific design, the cutting component 5 is a thermal resistance wire cutter connected to the control panel 6. The thermal resistance wire cutter is rotatably connected to the base plate of the maintenance vehicle 4 via a rotating mechanism. After the crack repair is completed, the rotating mechanism and the thermal resistance wire cutter installed at the front of the maintenance vehicle receive signals from the control panel. The motor of the rotating mechanism drives the thermal resistance wire cutter to rotate inward and upward, using the thermal resistance wire cutter to heat-melt the sealing tape on the surface of the pre-compression wheel, thereby cutting the sealing tape. The sealing tape on the gear shaft 7 is reserved for the next use.

[0053] Further optimize the above solution, such as Figure 2 As shown, an anti-detachment component is provided above the thermal resistance wire cutter. This component includes a pressure rod 13 and an arc-shaped pressure plate 14. The lower end of the pressure rod 13 is rotatably connected to the bottom plate of the maintenance vehicle 4 via a torsion spring (not shown in the figure). The upper end of the pressure rod 13 is connected to the arc-shaped pressure plate 14. The cross-section of the arc-shaped pressure plate 14 is U-shaped, matching the outer circle of the pre-pressure wheel 9. Under the elastic force of the torsion spring, the arc-shaped pressure plate 14 can press the sealing tape 00 onto the pre-pressure wheel 9. The upper end of the arc-shaped pressure plate 14 has a trumpet-shaped inlet. After the sealing tape is cut, the arc-shaped pressure plate fixes it, ensuring it remains tightly attached to the pre-pressure wheel even when in standby mode. Furthermore, after the sealing tape is fixed using this anti-detachment component, the maintenance vehicle can repair cracks smaller than 5mm using microwave heating without using the sealing tape as it moves backward.

[0054] The maintenance vehicle can repair cracks of different sizes: for cracks 5mm and larger, the vehicle needs to move forward to repair them using microwave-heated crack-sealing tape. For smaller cracks less than 5mm, the vehicle moves backward and repairs them by directly heating the crack with microwaves without using crack-sealing tape.

[0055] In specific design, such as Figure 2 As shown, the microwave heating assembly includes a waveguide 15, a second spring 16, and a metal mesh 17. The waveguide 15 is connected to a microwave generator (not shown in the figure), with its open end facing the ground. The top of the waveguide 15 is connected to the top of the housing 28 of the maintenance vehicle 4 via the second spring 16. The metal mesh 17 is located at the open end of the waveguide 15. Simultaneously, the maintenance vehicle 4 is equipped with a microwave power regulator 19 for adjusting microwave power. The microwave power regulator 19 is connected to the microwave generator and the control panel 6. The microwave power regulator 19 can transmit linear velocity signals to the control panel and control the real-time microwave power based on the mathematical relationship between power and speed.

[0056] During installation, the second spring 16 is fitted onto the second guide rod 27, and the upper end of the second guide rod 27 is fixed to the top of the housing 28 of the maintenance vehicle; the second spring provides downward preload to the waveguide.

[0057] To further optimize the above solution, the maintenance vehicle 4 is equipped with a laser sight 20 and a camera 21 at the front for identifying cracks, and a sensor 22 at the rear for monitoring the road surface crack repair process. The maintenance vehicle 4 is also equipped with an alarm (not shown in the figure). The laser sight 20 keeps the maintenance vehicle moving in a straight line, based on the position of the components inside the vehicle; the camera 21 identifies road surface cracks, and the sensor 22 monitors the repaired road surface; the alarm alerts pedestrians or vehicles, ensuring construction safety. The camera, sensors, and control panel can be connected to the internet to receive signals, enabling unmanned automatic driving and remote operation to independently complete crack identification and repair.

[0058] Furthermore, the maintenance vehicle 4 has a steering rod 23 on the top of its shell 28, which is connected to a steering mechanism (not shown in the figure) at the bottom of the maintenance vehicle 4. The steering rod 23 controls the direction of travel of the maintenance vehicle 4. The maintenance vehicle 4 has three or more wheels 25 at its bottom, with the steering mechanism connected to the wheels. The wheels are equipped with hub motors, tires, and an onboard power supply to provide power. The maintenance vehicle 4 has a door 18 on its side for easy access to the internal equipment. A handrail 24 is located at the rear of the maintenance vehicle 4 for easy pushing by staff.

[0059] In its specific construction, the maintenance vehicle measures 1.5 meters long, 1 meter wide, and 1.3 meters high. The body is made of high-strength low-alloy steel, and the surface is coated with an anti-corrosion layer to ensure adequate protection. The first spring is a 60cm long high-carbon steel spring with a modulus of elasticity of 220Pa. The maintenance vehicle's lightweight and compact structure makes it easy to load onto transport vehicles; it can adapt to narrow city streets and is conveniently transported to remote or confined work sites. This structure combines ease of operation, compactness, durability, protection, environmental friendliness, and aesthetics. The equipment can be used independently as a portable maintenance vehicle or integrated with larger maintenance equipment, offering flexible and versatile application scenarios.

[0060] In addition, the aforementioned maintenance vehicle can also employ deep learning methods, utilizing convolutional neural networks to learn and identify cracks directly from images through training on a large number of labeled samples. This allows for the collection of a vast amount of road image data, including samples containing and without cracks, ensuring the diversity and representativeness of the dataset. These images cover different lighting conditions, angles, background complexity, crack types, widths, lengths, colors, and potential interfering factors. Crack types are categorized (transverse cracks, longitudinal cracks, network cracks, alligator cracks, reflective cracks, block cracks, diagonal cracks, butt joint cracks, crack-type rutting, and fatigue cracks). Crack length and width have no fixed range and are generally classified as long cracks, short cracks, medium-length cracks, full-width cracks, and crack networks. Crack color depends primarily on the physical properties of the internal and surrounding materials, as well as external environmental factors, and can range from asphalt color, black, green, dark gray, yellow, to white. By collecting this crack information, images containing cracks are finely annotated, typically using pixel-level annotations or bounding box annotations. The annotations should accurately mark the location, shape, and extent of the cracks. Next, the original data is enhanced by means of rotation, scaling, flipping, brightness and contrast adjustment, and adding noise to increase the generalization ability of the model so that it can cope with various practical application scenarios.

[0061] Finally, it should be noted that the above descriptions are merely preferred embodiments of the present invention and are not intended to limit the present invention. Although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions described in the foregoing embodiments or make equivalent substitutions for some of the technical features. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the scope of protection of the claims of the present invention.

Claims

1. A method for intelligent crack repair based on microwave heating, characterized in that: Includes the following steps: Microwave heating is used to heat the repair material, and the melted repair material is then poured into the cracks in the asphalt pavement. The simulation calculations for the heat energy released by microwaves absorbed by the repair material are as follows: （1） where p is the density of the asphalt mixture, kg / m 3 ; t is the microwave heating time, s; T is the asphalt mixture heating temperature, ℃; T is the temperature gradient, ℃ / m; is the Laplacian operator; is the specific heat capacity of the constant pressure asphalt mixture, J / (g·℃); u is the velocity field defined by the translation motion child node, m / s; q is the conduction heat flux vector; is the microwave dissipation power, kW; The repair material consists of mineral powder and SBS modified bitumen, with a mass ratio of 6:

10. The mineral powder and SBS modified bitumen are mixed to form a paste. Microwaves are radiated using a waveguide connected to a microwave generator, which is installed at the bottom of the maintenance vehicle. The repair material is attached to the joint sealing tape. The relationship between microwave heating power and the maintenance vehicle's travel speed is as follows: （2） wherein is the conversion factor; W is the electrical energy consumed by the microwave generator, kW·h; is the specific heat capacity of the constant-volume asphalt mixture, J / (g·K); is the thickness of the mastic strip, mm; b is the width of the mastic strip, mm; The joint sealing tape consists of an anti-sticking layer, an adhesive layer, and a release layer from top to bottom. The anti-sticking layer is made of fine aggregate with a particle size of no more than 0.3 mm, which is evenly spread on the upper surface of the adhesive layer. The release layer is a metal grid, which is made of metal powder coated on the lower surface of the adhesive layer in a mesh pattern of no less than 0.4 mm.

2. An intelligent crack repair device based on microwave heating, characterized in that: The crack repair device uses the intelligent crack repair method based on microwave heating as described in claim 1 to repair cracks in asphalt pavement. The crack repair device includes a maintenance vehicle, a crack sealing tape unwinding assembly, a cutting assembly, and a microwave heating assembly. The crack sealing tape unwinding assembly and the microwave heating assembly are respectively located at the front and rear of the maintenance vehicle. The cutting assembly is located on the side of the crack sealing tape unwinding assembly and is used to cut the crack sealing tape. The maintenance vehicle is equipped with a control panel, and the crack sealing tape unwinding assembly, the microwave heating assembly, and the cutting assembly are all connected to the control panel. The maintenance vehicle can travel along the crack, the crack sealing tape unwinding assembly can release the crack sealing tape and lay it at the crack, and the microwave heating assembly can melt the crack sealing tape into the crack.

3. The intelligent crack repair device based on microwave heating according to claim 2, characterized in that: The seam sealing tape unwinding assembly includes a gear shaft for winding the film-coated seam sealing tape, a take-up shaft for winding the release film, and a pre-pressure roller for sealing the seam. The gear shaft is connected to a permanent magnet speed regulator, the gear shaft is connected to the pre-pressure roller via a chain, and the gear shaft is connected to the take-up shaft via a gear set. The cutting assembly is located on the front side of the pre-pressure roller. The axle of the pre-pressure roller is connected to the top of the maintenance vehicle via a first spring. After the release film is applied to one side of the seam sealing tape, it is wound around the gear shaft. The end of the seam sealing tape is wound around the pre-pressure roller, and the end of the release film is wound around the take-up shaft. During the movement of the maintenance vehicle, the pre-pressure roller presses the seam sealing tape onto the crack, while the release film is simultaneously wound around the take-up shaft.

4. The intelligent crack repair device based on microwave heating according to claim 2, characterized in that: The cutting assembly is a thermal resistance wire cutter connected to the control panel, and the thermal resistance wire cutter is rotatably connected to the floor of the maintenance vehicle.

5. The intelligent crack repair device based on microwave heating according to claim 2, characterized in that: The cutting assembly is equipped with an anti-dropping component above it. The anti-dropping component includes a pressure rod and an arc-shaped pressure plate. The lower end of the pressure rod is rotatably connected to the floor of the maintenance vehicle through a torsion spring. The upper end of the pressure rod is connected to the arc-shaped pressure plate. The arc-shaped pressure plate has a U-shaped cross-section and is used to press the sealing tape onto the pre-pressure roller.

6. The intelligent crack repair device based on microwave heating according to claim 2, characterized in that: The microwave heating assembly includes a waveguide, a second spring, and a metal mesh. The waveguide is connected to a microwave generator, with its open end facing the ground. The top of the waveguide is connected to the top of the maintenance vehicle via the second spring, and the metal mesh is located at the open end of the waveguide.

7. The intelligent crack repair device based on microwave heating according to claim 6, characterized in that: The maintenance vehicle is equipped with a microwave power regulator for adjusting microwave power, which is connected to the microwave generator and control panel.

8. The intelligent crack repair device based on microwave heating according to claim 2, characterized in that: The maintenance vehicle is equipped with a laser sight and camera at the front for identifying cracks, and sensors at the rear for monitoring the repair of road cracks; the maintenance vehicle is also equipped with an alarm.

9. The intelligent crack repair device based on microwave heating according to claim 2, characterized in that: The maintenance vehicle is equipped with a steering rod on its top, which is connected to a steering mechanism at the bottom of the vehicle. The steering rod controls the direction of travel of the maintenance vehicle.

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