Crack repairing structure and repairing unmanned aerial vehicle

Abstract

The application discloses a crack repairing structure and a repairing unmanned aerial vehicle. The crack repairing structure comprises a mounting frame, a liquid storage assembly, a liquid conveying assembly, a spraying assembly and a control assembly. The liquid storage assembly is arranged on the mounting frame and has at least one liquid storage cavity for containing repairing liquid. The inlet of the liquid conveying assembly is connected with the liquid storage cavity. The spraying assembly is arranged at the bottom of the mounting frame and is connected with the outlet of the liquid conveying assembly. The control assembly is respectively connected with the liquid conveying assembly and the spraying assembly in signal connection to control the liquid conveying assembly to quantitatively convey the repairing liquid to the spraying assembly and control the spraying assembly to automatically spray, so that the automatic and accurate repairing of the crack repairing structure is realized. The application solves the technical problem that the repairing efficiency and the repairing accuracy are both low in the existing crack repairing mode by using artificial repairing.

Description

Technical Field

[0001] This invention relates to the field of crack repair technology, specifically to a crack repair structure and a repair drone. Background Technology

[0002] Concrete is widely used in transportation infrastructure such as high-speed railway ballastless tracks, bridges, and tunnels due to its high compressive strength, low cost, and convenient construction. However, because concrete has relatively low tensile strength, it is prone to developing microcracks during service due to thermal shrinkage, drying shrinkage, and dynamic loads. These cracks not only affect the aesthetics of the structure but also become channels for corrosive media such as moisture and chloride ions, inducing steel corrosion and freeze-thaw damage, thereby threatening the durability and safety of the structure.

[0003] In existing technologies, the maintenance of concrete cracks mainly relies on manual inspection and experience-based repair. This approach suffers from several drawbacks: low efficiency and significant disruption; manual high-altitude work is risky, and the limited time available during nighttime "windows" makes it difficult to complete high-quality repairs quickly. Furthermore, the effectiveness of manual repairs is unpredictable, as they depend entirely on human experience, leading to inconsistent repair quality. Therefore, there is an urgent need for a crack repair structure and repair drone that offers both high efficiency and guaranteed repair quality. Summary of the Invention

[0004] The purpose of this invention is to provide a crack repair structure and a repair drone to solve the technical problems of low repair efficiency and low repair accuracy in existing methods of manually repairing cracks.

[0005] To achieve the above-mentioned technical objectives, the present invention adopts the following technical solution: In a first aspect, the present invention provides a crack repair structure, comprising: Mounting rack; A liquid storage assembly is disposed on the mounting bracket, and the liquid storage assembly has at least one liquid storage chamber for holding replenishing liquid; An infusion assembly, wherein the inlet of the infusion assembly is connected to the reservoir. A spraying assembly is disposed at the bottom of the mounting frame, and the spraying assembly is connected to the outlet of the infusion assembly; A control component is connected to the infusion component and the spraying component via signals to control the infusion component to quantitatively deliver replenishment fluid to the spraying component and to control the spraying component to automatically spray, thereby realizing automatic and precise repair of the crack repair structure.

[0006] In some embodiments, the liquid storage assembly includes a main chamber and a secondary chamber, which are arranged side by side on the mounting frame. The internal space of the main chamber forms a first liquid storage cavity, and the internal spaces of the multiple secondary chambers respectively form a second liquid storage cavity. Both the first and second liquid storage cavities have a liquid inlet and a liquid outlet. The liquid inlet is used for injecting replenishment liquid, and the liquid outlet is used for connecting to the infusion assembly.

[0007] In some embodiments, the volume of the first liquid storage chamber is greater than the volume of the second liquid storage chamber.

[0008] In some embodiments, the liquid storage assembly further includes a pressure balancing valve, which is respectively disposed on the top of the main compartment and the auxiliary compartment, and is respectively connected to the first liquid storage chamber and the second liquid storage chamber.

[0009] In some embodiments, the liquid storage assembly further includes a filter screen disposed at the liquid outlet to prevent impurities from entering the infusion assembly.

[0010] In some embodiments, the infusion assembly includes a tubing, a metering pump, and a solenoid valve. The inlet of the tubing is connected to the storage chamber, and the outlet of the tubing is connected to the spraying assembly. The metering pump is located at the inlet of the tubing, and the solenoid valve is located at the outlet of the tubing. The metering pump and the solenoid valve are respectively signal-connected to the control assembly.

[0011] In some embodiments, the spraying assembly includes a mixing chamber and a nozzle. The mixing chamber is detachably connected to the bottom of the mounting bracket. One end of the mixing chamber is connected to the outlet of the infusion assembly, and the other end of the mixing chamber is connected to the nozzle.

[0012] In some embodiments, the spraying assembly further includes a flow regulating valve disposed between the nozzle and the mixing chamber for regulating the amount of replenishment liquid entering the nozzle from the mixing chamber.

[0013] In some embodiments, the mounting bracket includes a base plate and a side plate. The base plate has a placement groove for mounting the liquid storage assembly. One end of the side plate is fixedly connected to the base plate, and the other end of the side plate is used to connect to a drone.

[0014] Secondly, the present invention also proposes a crack repair drone, including a drone body and a repair structure provided in the first aspect of the present invention, wherein the repair structure is detachably connected to the drone body.

[0015] Compared with the prior art, the beneficial effects of the present invention mainly include: This invention provides a crack repair structure and a repair drone. On the one hand, through the coordinated operation of the liquid storage component, the liquid delivery component, and the spraying component, automated crack repair is achieved, which greatly improves work efficiency and is less affected by the surrounding environment compared with the existing manual repair method. On the other hand, by controlling the amount of liquid delivered by the liquid delivery component to the spraying component through the control component, precise repair is achieved, which greatly improves the work accuracy and the versatility of the repair device compared with the existing manual repair method. Attached Figure Description

[0016] To more clearly illustrate the technical solutions in this application, the accompanying drawings used in the embodiments will be briefly described below: Figure 1 This is an overall schematic diagram of the crack repair structure described in this invention; Figure 2 This is another overall schematic diagram of the crack repair structure described in this invention; Figure 3 This is a schematic diagram of the mounting bracket described in this invention; Figure 4 This is a schematic diagram of the structure of the control component described in this invention; Figure 5 This is a schematic diagram of the structure of the connection component described in this invention.

[0017] As shown in the figure: 100. Mounting bracket; 110. Base plate; 111. Placement slot; 120. Side plate; 121. Connection hole; 200. Liquid storage assembly; 210. Main compartment; 220. Auxiliary compartment; 300. Infusion assembly; 310. Piping; 320. Metering pump; 400. Spraying assembly; 410. Mixing chamber; 420. Nozzle; 500. Control components; 510. Shielding box; 520. Transmitting and receiving antenna; 530. Main control board; 540. Power supply. A. Connecting components; A1. First bracket; A2. Second bracket; A3. Shock-absorbing ball. Detailed Implementation

[0018] To make the objectives, technical solutions, and advantages of this invention clearer, the invention will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative and not intended to limit the invention.

[0019] Currently, concrete is widely used in high-speed rail ballastless tracks, bridges, and tunnels due to its high compressive strength and low cost. However, during its service life, concrete is prone to micro-cracks due to thermal shrinkage, drying shrinkage, and dynamic loads. These cracks not only affect the aesthetics of the structure but also become channels for corrosive media such as moisture and chloride ions, inducing steel corrosion and frost damage, seriously threatening the durability and safety of the structure. Therefore, micro-cracks in concrete structures need to be repaired. Current technologies typically rely on manual inspection and experience-based repair methods for concrete crack repair. This approach is burdensome, inefficient, and susceptible to environmental influences, resulting in low repair accuracy and uncontrollable repair quality.

[0020] To address the shortcomings of the existing technologies, this invention provides a crack repair structure and a repair drone, which is an intelligent repair system for microcracks in concrete structures such as railway ballastless tracks, bridges, and tunnels, using drone-borne three-dimensional perception and microbial-induced calcium carbonate deposition.

[0021] like Figure 1-2 As shown, a first aspect of the present invention provides a crack repair structure, including a mounting frame 100, a liquid storage component 200, a liquid delivery component 300, a spraying component 400, and a control component 500. The mounting frame 100 serves as the mounting carrier for each component and the repair structure is mounted on a drone via the mounting frame 100. The liquid storage component 200 is disposed on the mounting frame 100, specifically on the upper part of the mounting frame 100, and has at least one liquid storage chamber for holding replenishing liquid. The inlet of the liquid delivery component 300 is connected to the liquid storage chamber. The spraying component 400 is disposed on the mounting frame. At the bottom of 100, the spraying component is connected to the outlet of the infusion component 300 of 400. The replenishing fluid contained in the storage chamber is transported to the spraying component 400 through the infusion component 300 and sprayed onto the concrete crack to be repaired by the spraying component 400. In addition, the repair structure provided by the present invention also includes a control component 500, which is signal-connected to the infusion component 300 and the spraying component 400 respectively, so as to control the infusion component 300 to quantitatively deliver replenishing fluid to the spraying component 400, and simultaneously control the spraying component 400 to automatically spray, so as to realize the automatic and precise repair of the crack repair structure.

[0022] In the above technical solution, the coordinated operation of the liquid storage component 200, the liquid delivery component 300, and the spraying component 400 enables automated repair of cracks in concrete structures. Compared with the existing manual repair method, this greatly improves work efficiency and is less affected by the surrounding environment. In addition, the control component 500 can control the liquid delivery component 300 to accurately and quantitatively deliver liquid to the spraying component 400, achieving precise repair. Compared with the existing manual repair method, this greatly improves the work accuracy and also enhances the versatility of the repair device.

[0023] It is understood that the replenishing fluid contained in the reservoir is made of the same material as the concrete structure to be repaired, in order to improve the compatibility between the repair material and the substrate to be repaired.

[0024] In specific implementations of this invention, such as Figure 3 As shown, the mounting bracket 100 includes a base plate 110 and a side plate 120. The base plate 110 has a placement groove 111 for mounting the liquid storage assembly 200. One end of the side plate 120 is fixedly connected to the base plate 110, and the other end of the side plate 120 is used to connect to the drone.

[0025] Furthermore, the base plate 110 and the side plate 120 are integrally formed, which helps to improve the stability of the mounting bracket 100.

[0026] Furthermore, the base plate 110 and side plate 120 are made of carbon fiber material, which helps to reduce the weight of the repair structure and also facilitates the flight of the drone after it is installed on the drone.

[0027] Furthermore, the number and shape of the placement grooves 111 formed on the base plate 110 match the liquid storage cavity; in addition, a wiring groove for wiring is also formed on the base plate 110.

[0028] Furthermore, the side plate 120 is arranged around the base plate 110 to enhance the stability of the liquid storage chamber. The side plate 120 is also provided with multiple connection holes 121 at the end away from the base plate 110 for detachable connection with the drone.

[0029] In a specific implementation of the present invention, the liquid storage assembly 200 includes a main chamber 210 and a secondary chamber 220, which are arranged side by side on the mounting frame 100, specifically in the placement groove 111 formed in the base plate 110. The internal space of the main chamber 210 forms a first liquid storage chamber, and the internal spaces of the multiple secondary chambers 220 respectively form a second liquid storage chamber. Both the first and second liquid storage chambers have a liquid inlet and a liquid outlet. The liquid inlet is used to inject replenishment liquid, and the liquid outlet is used to connect to the infusion assembly 300.

[0030] In this embodiment, there is one main compartment 210 and two auxiliary compartments 220. The main compartment 210 and the two auxiliary compartments 220 are arranged in two rows on the base plate 110. Both the main compartment 210 and the auxiliary compartments 220 are made of corrosion-resistant polymer materials. The total volume of the main compartment 210 and the auxiliary compartments 220 does not exceed 300ml, and the total weight of the entire repair structure does not exceed 350g.

[0031] In this embodiment, the main compartment 210 is used to store mortar matrix premixed with dormant Bacillus, and the two auxiliary compartments 220 are respectively loaded with cementing liquids containing different polysaccharide polymers.

[0032] In this embodiment, the internal space of the main compartment 210 constitutes the first liquid storage chamber, the internal space of the auxiliary compartment 220 constitutes the second liquid storage chamber, and the volume of the first liquid storage chamber is greater than the volume of the second liquid storage chamber.

[0033] In this embodiment, the top of the main chamber 210 and the auxiliary chamber 220 are respectively provided with a liquid inlet and a pressure balancing valve. The liquid inlet is connected to an external liquid replenishment system and is used to replenish the first liquid storage chamber and the second liquid storage chamber. A control valve is also provided at the liquid inlet, and the control valve should be signal-connected to the control component 500. The pressure balancing valve is respectively located on the top of the main chamber and the auxiliary chamber and is connected to the first liquid storage chamber and the second liquid storage chamber respectively. The pressure balancing valve is used to control the pressure in the first liquid storage chamber and the second liquid storage chamber to prevent safety accidents.

[0034] Furthermore, the bottom of the main chamber 210 and the auxiliary chamber 220 are respectively provided with liquid outlets, and the liquid outlets are also provided with filter screens to prevent impurities from clogging the infusion assembly 300.

[0035] In specific implementation, this invention combines Figure 2 As shown, the infusion assembly 300 includes a pipeline 310, a metering pump 320, and a solenoid valve. The inlet of the pipeline 310 is connected to the liquid storage chamber, and the outlet of the pipeline 310 is connected to the spraying assembly 400. The metering pump 320 is located at the inlet of the pipeline 310, and the solenoid valve is located at the outlet of the pipeline 310. The metering pump 320 and the solenoid valve are respectively connected to the control assembly 500 via signal connection.

[0036] In this embodiment, the pipeline 310 is a flexible silicone tube, the metering pump 320 is installed at the liquid outlet of the main chamber 210 and the auxiliary chamber 220, one end of the pipeline 310 is connected to the metering pump 320, and the other end of the pipeline 310 is directly connected to the spraying assembly 400 or connected to a T-junction, while the solenoid valve is installed at the other end of the pipeline 310 to control the opening or closing of the pipeline 310.

[0037] In this embodiment, the replenishment liquid in the main chamber 210 and the auxiliary chamber 220 can be precisely and quantitatively supplied to the spraying assembly 400 through the pipeline 310 under the control of the metering pump 320 and the solenoid valve, or it can be sent to the spraying assembly 400 after being combined through a three-way valve. In actual use, the appropriate method can be selected flexibly as needed.

[0038] In addition, the installation of the pipeline 310 is carried out using quick-connect couplings, which has the advantage of convenient installation and disassembly.

[0039] In specific implementation, this invention combines Figure 2 As shown, the spraying assembly 400 includes a mixing chamber 410 and a nozzle 420. The mixing chamber 410 is detachably connected to the bottom of the mounting bracket 100, specifically to the bottom of the base plate 110. One end of the mixing chamber 410 is connected to the outlet of the infusion assembly 300 through a pipe 310, and the other end of the mixing chamber 410 is connected to the nozzle 420.

[0040] Furthermore, the nozzle 420 is a bottom-mounted multi-head nozzle, which includes 3-5 micro-holes distributed in a fan shape, enabling low-pressure atomization or directional dripping.

[0041] Furthermore, the spraying assembly 400 also includes a flow regulating valve, which is disposed between the nozzle 420 and the mixing chamber 410, and is used to regulate the amount of liquid replenished from the mixing chamber 410 to the nozzle 420.

[0042] Furthermore, the spraying assembly 400 is also connected to the base plate 110 of the mounting bracket 100 via a quick-release plug, so as to facilitate the replacement of nozzles 420 of different specifications to adapt to different crack widths.

[0043] In specific implementations of this invention, such as Figure 4 As shown, the control component 500 includes a shielding box 510, a transmitting and receiving antenna 520, a main control board 530, and a power supply 540. The shielding box 510 is installed on the side of the side plate 120 of the mounting bracket 100. The main control board 530 and the power supply 540 are encapsulated inside the shielding box 510. The transmitting and receiving antenna 520 is located on the top of the shielding box 510 and is used to communicate with the UAV flight control system and receive spraying commands.

[0044] A second aspect of the present invention provides a crack repair drone, comprising a drone body and a repair structure provided in the first aspect of the present invention, wherein the repair structure is detachably connected to the drone body.

[0045] In specific implementation, the repair structure is detachably connected to the main body of the drone via connecting component A; further, as... Figure 5As shown, the connecting component A includes a first bracket A1 and a second bracket A2. The two first brackets A1 are arranged in parallel and spaced apart, and the two second brackets A2 are also arranged in parallel and spaced apart. The two second brackets A2 are fixed on the top of the two first brackets A1. The angle between the two second brackets A2 and the two first brackets A1 is 90°. That is, the two first brackets A1 and the two second brackets A2 form a "well" shaped connecting component A. The upper part is connected to the main body of the UAV through eight shock-absorbing balls A3.

[0046] Furthermore, both the first bracket A1 and the second bracket A2 are made of carbon fiber tubing, and the installation position can be adjusted according to the load to ensure the stability of the drone hovering. All external cables are wrapped with anti-wave sleeves and run along the base plate 110 of the mounting bracket 100 to reduce electromagnetic interference.

[0047] This invention provides a crack repair structure and a repair drone, the core of which lies in the deep integration of the drone's aerial maneuverability, three-dimensional crack perception technology, and microbial induced calcium carbonate deposition (MICP) repair process, forming a closed-loop intelligent repair system of "perception-decision-execution-verification". Its specific working principle is as follows: 1. Three-dimensional perception and parameter extraction of cracks Before the spraying operation begins, the drone, equipped with a high-resolution binocular vision system and an onboard edge computing unit, scans the target concrete structure. The system uses a stereo matching algorithm to obtain a dense parallax map of the crack area and, combined with the drone's flight altitude, attitude angle (provided by the IMU), and camera calibration parameters, reconstructs a 3D point cloud model of the crack in real time. Based on this, the edge computing module automatically extracts key geometric parameters: crack surface width (accuracy up to 0.1 mm), crack extension length, crack orientation, and crack depth and cross-sectional morphology estimated using photometric stereo or structured light projection. This 3D information overcomes the limitations of traditional 2D images, which cannot quantify depth and spatial orientation, providing a quantitative basis for the dynamic mixing of subsequent repair materials. For example, for microcracks with a width <0.3 mm, the system determines that only low-viscosity cementitious liquid penetration is needed; while for cracks with a width >0.5 mm and greater depth, a combination of high-concentration Bacillus subtilis mortar and polysaccharide cementitious liquid is required. All parameters are transmitted to the electrical control module in real time via a serial interface.

[0048] 2. Dynamic proportioning instruction generation and transmission After receiving the crack feature data, the control component 500 uses its built-in embedded algorithm, based on a preset expert rule base or lightweight neural network model, to calculate the optimal volume ratio of the three liquids: Main compartment 210: mortar matrix premixed with dormant Bacillus subtilis (containing urea, calcium source and bacterial cells); Sub-compartment 220: A cementing solution with added carboxymethyl cellulose (CMC) to increase solution viscosity and enhance adhesion to the crack sidewalls; Sub-compartment 220: A cementing solution with added hydroxypropyl methylcellulose (HPMC) used to regulate the crystal morphology and precipitation rate of mineralized products.

[0049] 3. Multi-warehouse independent quantitative conveying Each of the three compartments is connected to a high-precision metering pump 320 (plunger pump or gear pump type, flow resolution ≤0.01mL / min). The main control board 530 outputs a PWM signal of the corresponding frequency to drive the metering pump 320 to rotate at the target speed, drawing liquid out of the compartment. The pump is equipped with a photoelectric encoder or Hall sensor to provide real-time feedback of the rotation speed to the controller, forming a closed-loop regulation to ensure that the flow error is ≤±3%. Synchronized with metering pump 320, control component 500 opens the corresponding solenoid valve. The solenoid valve response time is ≤20ms to prevent liquid from dripping when the machine is stopped. After passing through their respective metering pumps and solenoid valves, the three liquids converge into the mixing chamber 410 via pipeline 310. The mixing chamber 410 is equipped with spiral blades or cross baffles. By utilizing the turbulence and shearing effect of the liquid flow, uniform mixing is achieved within a very short stroke (<5cm) without the need for external power.

[0050] 4. Atomized spraying and precise coverage (operation execution) The uniformly mixed repair solution enters the nozzle 420 from the mixing chamber 410. The nozzle 420 contains 3 to 5 fan-shaped micropores (pore diameter 0.2 to 0.5 mm), which can achieve two modes: low-pressure atomization (droplet size 50 to 150 μm) or directional dripping. An adjustable flow regulating valve is provided between the nozzle 420 and the mixing chamber 410 to adjust the spray flow rate and atomized particle size according to the crack width: for wide cracks or concentrated areas, a larger flow rate and a wider atomization angle (about 60°) are used for rapid coverage; for narrow cracks or precise repairs, the flow rate is reduced and the dripping mode is switched to reduce splashing and waste. During the spraying process, the UAV flight control system maintains the hovering height (usually 10-20cm from the crack surface) through downward vision or laser rangefinders, and uses onboard GPS and visual positioning to lock the horizontal position, ensuring that the nozzle 420 is directly facing the center of the crack. The spraying time is automatically calculated by the crack area and the total flow rate. After the spraying is completed, the solenoid valve immediately closes and the metering pump stops, completing one operation.

[0051] 5. Closed-loop verification and optimization After spraying is completed, the drone can switch to re-inspection mode: using the same vision system to scan the repaired area again, it generates a repair quality report by comparing indicators such as crack closure rate and filling depth (measured by infrared thermal imaging or structured light to measure surface depressions) before and after repair. If insufficient filling or surface defects are found, the system automatically plans a secondary spraying path, forming a closed-loop intelligent operation and maintenance process of "identification—repair—verification—optimization". All operational data (crack parameters, mixing scheme, spraying flow rate, repair effect) are uploaded to the ground server via 5G or data transmission link for subsequent algorithm iteration and health management.

[0052] 6. Railway-specific adaptation To address the operational needs of high-speed railway ballastless tracks during nighttime "maintenance windows," the device is equipped with low-power LED supplementary lighting and an infrared auxiliary positioning module, enabling normal operation in low-light conditions. The electrical control module is encapsulated in a fully metal shielded box, and the cables are fitted with anti-wave sleeves to effectively resist electromagnetic interference generated by track circuits. The combination of a carbon fiber rigid support and shock-absorbing balls filters high-frequency vibrations from the drone rotor, ensuring stable liquid flow within the mixing chamber. The entire unit weighs ≤350g, minimizing its impact on drone flight time and making it compatible with industrial-grade platforms such as the DJI M300 / M350.

[0053] In summary, this invention not only solves the core equipment problem of transforming microbial repair of concrete cracks from laboratory technology to engineering application, but also provides a practical and feasible technical solution for the intelligent and green maintenance of infrastructure such as high-speed railway ballastless track, bridges, and tunnels through systematic innovations such as three-dimensional perception, dynamic proportioning, closed-loop verification, and railway scenario adaptation, which has significant economic and social benefits.

[0054] The specific embodiments of the present invention described above do not constitute a limitation on the scope of protection of the present invention. Any other corresponding changes and modifications made in accordance with the technical concept of the present invention should be included within the scope of protection of the claims of the present invention.

Claims

1. A crack repair structure, characterized in that, include: Mounting rack; A liquid storage assembly is disposed on the mounting bracket, and the liquid storage assembly has at least one liquid storage chamber for holding replenishing liquid; An infusion assembly, wherein the inlet of the infusion assembly is connected to the reservoir. A spraying assembly is disposed at the bottom of the mounting frame, and the spraying assembly is connected to the outlet of the infusion assembly; A control component is connected to the infusion component and the spraying component via signals to control the infusion component to quantitatively deliver replenishment fluid to the spraying component and to control the spraying component to automatically spray, thereby realizing automatic and precise repair of the crack repair structure.

2. The crack repair structure according to claim 1, characterized in that, The liquid storage assembly includes a main chamber and a secondary chamber, which are arranged side by side on the mounting frame. The internal space of the main chamber forms a first liquid storage cavity, and the internal spaces of the multiple secondary chambers respectively form a second liquid storage cavity. Both the first and second liquid storage cavities have a liquid inlet and a liquid outlet. The liquid inlet is used for injecting replenishment liquid, and the liquid outlet is used for connecting to the infusion assembly.

3. The crack repair structure according to claim 2, characterized in that, The volume of the first liquid storage chamber is greater than the volume of the second liquid storage chamber.

4. The crack repair structure according to claim 2, characterized in that, The liquid storage assembly also includes a pressure balancing valve, which is respectively located on the top of the main compartment and the auxiliary compartment, and is connected to the first liquid storage chamber and the second liquid storage chamber respectively.

5. The crack repair structure according to claim 2, characterized in that, The liquid storage assembly also includes a filter screen, which is disposed at the liquid outlet to prevent impurities from entering the infusion assembly.

6. The crack repair structure according to claim 1, characterized in that, The infusion assembly includes a tubing, a metering pump, and a solenoid valve. The inlet of the tubing is connected to the storage chamber, and the outlet of the tubing is connected to the spraying assembly. The metering pump is located at the inlet of the tubing, and the solenoid valve is located at the outlet of the tubing. The metering pump and the solenoid valve are respectively connected to the control assembly via signal connection.

7. The crack repair structure according to claim 1, characterized in that, The spraying assembly includes a mixing chamber and a nozzle. The mixing chamber is detachably connected to the bottom of the mounting bracket. One end of the mixing chamber is connected to the outlet of the infusion assembly, and the other end of the mixing chamber is connected to the nozzle.

8. The crack repair structure according to claim 7, characterized in that, The spraying assembly also includes a flow regulating valve, which is disposed between the nozzle and the mixing chamber and is used to regulate the amount of liquid replenished from the mixing chamber to the nozzle.

9. The crack repair structure according to claim 1, characterized in that, The mounting bracket includes a base plate and a side plate. The base plate has a placement groove for mounting the liquid storage assembly. One end of the side plate is fixedly connected to the base plate, and the other end of the side plate is used to connect to the drone.

10. A crack repair drone, characterized in that, include: The main body of the drone; The repair structure as described in any one of claims 1-9 is detachably connected to the main body of the drone.

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