Method and system for detecting stress change of rock-fill dam
By introducing a cleaning and blowing structure into the GNSS monitoring device, the problem of solar photovoltaic panels being covered by debris was solved, achieving efficient power generation and stable operation of the monitoring system.
Patent Information
- Application Number
- CN202510883096.9
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2025-06-28
- Publication Date
- 2025-09-16
AI Technical Summary
The solar photovoltaic panels of existing GNSS monitoring devices are easily covered by debris such as leaves and dust, resulting in reduced power generation efficiency and affecting the stable operation of the rockfill dam stress detection system.
A GNSS monitoring device including a cleaning structure and a blowing structure is designed. The cleaning structure drives a screw and a cleaning plate through a driving motor to clean the solar photovoltaic panel. The blowing structure blows away debris through the blowing structure to improve the light energy absorption effect of the photovoltaic panel.
Effectively clean the debris on the solar photovoltaic panels, improve the power generation efficiency, ensure the normal use of monitoring equipment, and ensure the stable operation of the rockfill dam stress detection system.
Smart Images
Figure CN120651405A_ABST
Abstract
Description
Technical Field
[0001] The present application relates to the technical field of rockfill dam stress change detection, and in particular to a method and system for detecting stress changes in rockfill dams. Background Art
[0002] Rockfill dams, key facilities in water conservancy and hydropower projects, are hydraulic structures primarily constructed of stone. Their structure is composed of a rockfill body and an impermeable body. The former, relying on its own gravity, resists water pressure, while the latter, by blocking the water flow path, provides an impermeable barrier. Together, they achieve the core goal of retaining and storing water.
[0003] Stress testing of rockfill dams is a crucial tool for ensuring the safe operation of the dam. It utilizes specialized technical means to monitor the stress distribution and dynamic changes within and around the dam in real time. By accurately assessing the stress state under the influence of factors such as water pressure, deadweight load, and permeability, it can promptly detect and provide early warning of potential safety hazards such as cracking, deformation, and landslides within the dam, providing a scientific basis for project maintenance and risk prevention.
[0004] Currently, rockfill dam stress detection systems primarily consist of GNSS displacement monitoring devices, strain gauges, inclinometers, and other equipment. GNSS monitoring devices, as the core link for data collection, need to be deployed at multiple locations on the dam body to obtain comprehensive data. However, existing GNSS monitoring devices are generally powered by solar photovoltaic panels. Since they are often installed in open areas, the panels are easily covered by debris such as leaves and dust. This obstruction significantly reduces the panels' effective illuminated area, severely reducing power generation efficiency. Long-term accumulation of this debris will make it difficult to meet the monitoring device's power needs, thereby affecting the stable operation of the entire detection system. Summary of the Invention
[0005] The purpose of this application is to solve the problems raised in the above background technology. This application provides a method and system for detecting stress changes in rockfill dams.
[0006] In order to achieve the above-mentioned purpose, this application specifically adopts the following technical solutions: A method for detecting stress changes in a rockfill dam, the method comprising the following steps: S1: Deploy GNSS monitoring devices in stress-sensitive areas of the rockfill dam; S2: Collect GNSS displacement data through GNSS monitoring device and perform preprocessing; S3: Draw displacement cloud maps of each section of the dam body and perform stress field inversion analysis based on the collected data; S4: Issue early warnings on stress changes and verify the accuracy of GNSS inversion stress; S5: Finally, output the results and generate a report.
[0007] A system for detecting stress changes in a rockfill dam, applying the above-described method for detecting stress changes in a rockfill dam, comprises a support column, a mounting seat being fixed to the lower end of the support column, a GNSS antenna being mounted on the upper end of the support column, a control box and a support frame being fixed to the support column, a solar photovoltaic panel being fixed inside the support frame, the control box being electrically connected to the GNSS antenna and the solar photovoltaic panel, and a cleaning structure and an air blowing structure being provided on the support frame.
[0008] By adopting the above technical solution, when in use, multiple GNSS monitoring devices are arranged in the stress-sensitive area of the rockfill dam, and data is collected and pre-processed by the device. Displacement cloud maps of each section of the dam body and stress field inversion analysis are drawn based on the collected data, and stress change warnings are issued and the accuracy of the GNSS inversion stress is verified. Finally, the results are output and a report is generated. During the use of the device, the cleaning structure can be used to clean the solar photovoltaic panels to improve their power generation efficiency, and the blowing structure can be used to improve the cleaning effect of the cleaning structure.
[0009] Furthermore, the cleaning structure includes a bidirectional screw rod rotatably connected to the inside of the support frame, a moving block is installed on the bidirectional screw rod, a nut seat matching the bidirectional screw rod is fixed inside the moving block, the nut seat sleeve is arranged on the bidirectional screw rod, a mounting strip is fixed on the side of the moving block, a cleaning plate is fixed on the side of the mounting strip, the cleaning plate is an elastic rubber plate, a driving motor is installed on the side of the support frame, the driving motor is electrically connected to the control chassis, and a rotating brush assembly is provided on the side of the cleaning plate.
[0010] By adopting the above technical solution, the solar photovoltaic panels can be cleaned regularly through the cleaning structure, reducing debris such as leaves and dust attached to their surface, improving the light energy absorption effect of the solar photovoltaic panels, and thus ensuring the normal use of the monitoring equipment.
[0011] Furthermore, pulleys are fixed to the output end of the driving motor and the end of the bidirectional screw rod, and the two pulleys are connected by a transmission belt.
[0012] By adopting the above technical solution, the driving motor works, and the bidirectional screw is rotated under the action of the pulley and the transmission belt, thereby playing a transmission role.
[0013] Furthermore, a guide column is fixed inside the support frame, a guide block is slidably sleeved on the guide column, and one end of the mounting bar away from the moving block is fixedly connected to the guide block.
[0014] By adopting the above technical solution, the guide column and the guide block can play a guiding and further supporting role, making the movement of the cleaning plate more stable.
[0015] Furthermore, the rotating brush assembly includes a rotating shaft rotatably connected between the moving block and the guide block, and a rotating brush is fixed on the rotating shaft.
[0016] By adopting the above technical solution, the cleaning effect of the cleaning plate on the solar photovoltaic panel can be further improved by rotating the brush. Furthermore, a transmission rack is fixed inside the support frame, and one end of the rotating shaft close to the moving block passes through the moving block and is fixed with a transmission gear, and the transmission gear is meshed with the transmission rack.
[0017] By adopting the above technical solution, during the movement of the rotating shaft, the rotating shaft rotates under the action of the transmission gear and the transmission rack, and the rotation of the rotating shaft causes the rotating brush to rotate, thereby playing a transmission role.
[0018] Furthermore, the blowing structure includes a blowing shell fixed inside the support frame, a corrugated hose is fixed on the blowing shell, a guide pipe is fixed on the end of the corrugated hose away from the blowing shell, a trumpet pipe is fixed on the guide pipe, connecting plates are fixed on the moving block and the guide block, the guide pipe is fixedly connected to the connecting plate, an air intake pipe is fixed on the end of the blowing shell away from the corrugated hose, and a filter is fixed inside the air intake pipe.
[0019] By adopting the above technical solution, the blowing structure can be used to blow air onto the solar photovoltaic panels during the cleaning process, so that dust is separated from the solar photovoltaic panels, thereby improving the cleaning effect of the cleaning structure.
[0020] Furthermore, a drive shaft is rotatably connected inside the blowing shell, an impeller is fixed on the drive shaft, a driving gear is fixed on the output end of the drive motor, and the end of the drive shaft away from the impeller extends out of the blowing shell and is fixed with a driven gear meshing with the driving gear.
[0021] By adopting the above technical solution, the driving motor drives the driving gear to rotate, causing the driven gear to rotate, thereby causing the driving shaft to drive the impeller to rotate, generating wind power.
[0022] In summary, the present application includes at least one of the following beneficial effects: 1. In the present application, when the solar photovoltaic panels need to be cleaned during the long-term use of the monitoring system, the driving motor is turned on regularly, and the bidirectional screw is rotated under the action of the pulley and the pulley, and the moving block drives the mounting bar to move back and forth inside the mounting frame under the action of the guide block and the guide rod, and the mounting bar drives the cleaning plate to move when it moves. During the reciprocating movement of the cleaning plate, debris such as leaves and dust attached to the solar photovoltaic panels can be scraped off, reducing debris such as leaves and dust attached to the surface of the solar photovoltaic panels, thereby reducing the effective illumination area of the solar photovoltaic panels caused by leaves and dust, affecting the solar photovoltaic panels' absorption efficiency of light energy and affecting the power generation efficiency, and affecting the normal use of the monitoring system. By regularly cleaning the solar photovoltaic panels, the power generation efficiency of the solar photovoltaic panels can be guaranteed, and the normal requirements of the GNSS monitoring device can be met, so that the entire detection system can operate normally.
[0023] 2. In the present application, when the moving block and the guide block move, the rotating shaft and the rotating brush will be driven to move together. When the rotating brush moves, it will fit with the solar photovoltaic panel. The movement of the rotating brush can further clean the solar photovoltaic panel, thereby improving the cleaning effect of the cleaning plate on the solar photovoltaic panel. At the same time, when the rotating shaft moves, under the action of the transmission gear and the transmission rack, the rotating shaft drives the rotating brush to rotate. The cleaning brush that moves back and forth and rotates has a better cleaning effect, and can effectively clean leaves and dust with strong adhesion to the surface of the solar photovoltaic panel, thereby improving the cleaning effect of the solar photovoltaic panel.
[0024] 3. When the moving block and the guide block move, the guide pipe and the trumpet pipe will move together. When the driving motor is working, the driving gear and the driven gear will drive the driving shaft to rotate, and the rotation of the impeller will generate negative pressure inside the blowing shell, thereby sucking the external air into the blowing shell through the air inlet pipe, and then blowing it out through the trumpet pipe onto the solar photovoltaic panel, so that the leaves and dust on the solar photovoltaic panel are loosened or fall off, making it easier for the cleaning plate and the rotating brush to clean the leaves and dust, making it easier for the leaves and dust to be separated from the solar photovoltaic panel, reducing the cleaning pressure of the cleaning plate and the rotating brush; and the blowing force generated can blow up floating debris such as dust, so that the floating debris such as dust is scattered, reducing secondary attachment. BRIEF DESCRIPTION OF THE DRAWINGS
[0025] Figure 1 It is a schematic diagram of the three-dimensional structure of the detection system in this application; Figure 2 This is a first three-dimensional structural diagram of the support frame, cleaning structure, and blowing structure in this application; Figure 3 This is a first three-dimensional structural diagram of the support frame, cleaning structure, and blowing structure in this application; Figure 4This application Figure 2 A in the middle is an enlarged schematic diagram; Figure 5 This application Figure 2 The enlarged schematic diagram of point B in the middle; Figure 6 It is a schematic diagram of the internal structure of the blowing shell in this application.
[0026] Description of reference numerals: 1. Support column; 11. Mounting seat; 12. GNSS antenna; 13. Control chassis; 14. Support frame; 15. Solar photovoltaic panel; 2. Cleaning structure; 21. Bidirectional screw; 22. Moving block; 23. Mounting strip; 24. Cleaning plate; 25. Drive motor; 26. Pulley; 261. Drive belt; 27. Guide column; 271. Guide block; 28. Rotating brush assembly; 281. Rotating shaft; 282. Rotating brush; 283. Transmission rack; 284. Transmission gear; 3. Blowing structure; 31. Blowing shell; 32. Corrugated hose; 33. Guide pipe; 34. Trumpet; 35. Connecting plate; 36. Drive shaft; 361. Impeller; 362. Filter; 37. Driving gear; 371. Driven gear; 38. Inlet pipe. DETAILED DESCRIPTION
[0027] The following is combined with Figure 1-6 This application is described in further detail.
[0028] The embodiments of the present application disclose a method and system for detecting stress changes in a rockfill dam.
[0029] A method for detecting stress changes in a rockfill dam, the method comprising the following steps: S1: Deploy GNSS monitoring devices in stress-sensitive areas of the rockfill dam; S2: Collect GNSS displacement data through GNSS monitoring device and perform preprocessing; S3: Draw displacement cloud maps of each section of the dam body and perform stress field inversion analysis based on the collected data; S4: Issue early warnings on stress changes and verify the accuracy of GNSS inversion stress; S5: Finally, output the results and generate a report.
[0030] Reference Figure 1A detection system for stress changes in rockfill dams, applying the above-mentioned detection method for stress changes in rockfill dams, includes a support column 1, a mounting base 11 is fixed at the lower end of the support column 1, a GNSS antenna 12 is installed at the upper end of the support column 1, a control box 13 and a support frame 14 are fixed on the support column 1, a solar photovoltaic panel 15 is fixed inside the support frame 14, the control box 13 is electrically connected to the GNSS antenna 12 and the solar photovoltaic panel 15, and a cleaning structure 2 and a blowing structure 3 are provided on the support frame 14.
[0031] During use, multiple GNSS devices are installed in stress-sensitive areas of the rockfill dam. Depending on the size of the dam, a measuring point is usually set up every 50-100 meters. High-risk areas (such as near cracks in the dam body) need to have more frequent deployment. The GNSS monitoring device is used in conjunction with professional software to record raw observation data such as carrier phase and pseudorange, and the data is pre-processed. Displacement cloud maps of each section of the dam body are drawn based on the data, and the maximum displacement area is identified. The strain rate is calculated based on the displacement difference between adjacent measuring points. A stress inversion model is constructed based on the strain rate. After that, stress change characteristics are analyzed, and then stress change warning and verification are carried out. Combined with the data from stress gauges and inclinometers buried inside the dam body, the accuracy of the GNSS inverted stress is verified. When the stress change exceeds the threshold, an early warning report is automatically generated. Finally, the results are output and a report is generated. A GNSS monitoring database for rockfill dams is established to store raw data, processing results, and inversion model parameters to provide data support for long-term safety assessments. During use, the GNSS device can regularly clean leaves, dust and other debris attached to the surface of the solar photovoltaic panel 15 through the cleaning structure 2, reducing the impact of leaves, dust and other debris on the power generation efficiency of the solar photovoltaic panel 15, and the blowing structure 3 can improve the cleaning effect of the cleaning structure 2.
[0032] Reference Figure 2-Figure 5 The cleaning structure 2 includes a bidirectional screw rod 21 rotatably connected to the inside of the support frame 14, and a moving block 22 is installed on the bidirectional screw rod 21. A nut seat that matches the bidirectional screw rod 21 is fixed inside the moving block 22, and the nut seat sleeve is arranged on the bidirectional screw rod 21. A mounting strip 23 is fixed on the side of the moving block 22, and a cleaning plate 24 is fixed on the side of the mounting strip 23. The cleaning plate 24 is an elastic rubber plate. A drive motor 25 is installed on the side of the support frame 14, and the drive motor 25 is electrically connected to the control chassis 13. A rotating brush assembly 28 is provided on the side of the cleaning plate 24.
[0033] The output end of the driving motor 25 and the end of the bidirectional screw rod 21 are both fixed with pulleys 26 , and the two pulleys 26 are connected by a transmission belt 261 .
[0034] In addition, a guide column 27 is fixed inside the support frame 14 , and a guide block 271 is slidably sleeved on the guide column 27 . One end of the mounting bar 23 away from the moving block 22 is fixedly connected to the guide block 271 .
[0035] When the monitoring system needs to be cleaned during long-term use, the driving motor 25 is turned on regularly to drive the pulley 26 at its output end. Then, under the action of the transmission belt 261, the pulley 26 at the end of the bidirectional screw rod 21 rotates, thereby causing the bidirectional screw rod 21 to rotate. When the bidirectional screw rod 21 rotates, the moving block 22 and the nut seat inside it are subjected to force, which causes the mounting bar 23 to be subjected to force. At the same time, it is restricted by the guide block 271 and the guide rod, so that the moving block 22 drives the mounting bar 23 to move back and forth inside the mounting frame. During the movement, the guide block 271 slides on the guide column 27, and the mounting bar 2 3 moves, driving the cleaning plate 24 to move. During the reciprocating movement of the cleaning plate 24, it can scrape off leaves, dust and other debris attached to the solar photovoltaic panel 15, reducing the leaves, dust and other debris attached to the surface of the solar photovoltaic panel 15, thereby reducing the problem of leaves and dust blocking the effective illumination area of the solar photovoltaic panel 15, affecting the solar photovoltaic panel 15's absorbing efficiency of light energy and affecting the power generation efficiency, and affecting the normal use of the monitoring system. By regularly cleaning the solar photovoltaic panel 15, the power generation efficiency of the solar photovoltaic panel 15 can be guaranteed, which can meet the normal needs of the GNSS monitoring device and make the whole detection system operate normally.
[0036] Reference Figure 2 、 Figure 4 、 Figure 5 The rotating brush assembly 28 includes a rotating shaft 281 rotatably connected between the moving block 22 and the guide block 271 , and a rotating brush 282 is fixed on the rotating shaft 281 . The rotating brush 282 is attached to the solar photovoltaic panel 15 during the movement process.
[0037] A transmission rack 283 is fixed inside the support frame 14 , and one end of the rotating shaft 281 close to the moving block 22 passes through the moving block 22 and is fixed with a transmission gear 284 , which is meshed with the transmission rack 283 .
[0038] When the moving block 22 and the guide block 271 move, they will drive the rotating shaft 281 and the rotating brush 282 to move together. The movement of the rotating brush 282 can further clean the solar photovoltaic panel 15, and improve the cleaning effect of the cleaning plate 24 on the solar photovoltaic panel 15. At the same time, when the rotating shaft 281 moves, under the action of the transmission gear 284 and the transmission rack 283, the rotating shaft 281 drives the rotating brush 282 to rotate. The cleaning brush that moves back and forth and rotates has a better cleaning effect, and can effectively clean leaves and dust with strong adhesion to the surface of the solar photovoltaic panel 15, thereby improving the cleaning effect of the solar photovoltaic panel 15.
[0039] Reference Figure 3-Figure 6 The blowing structure 3 includes a blowing shell 31 fixed to the inside of the support frame 14, a corrugated hose 32 is fixed on the blowing shell 31, a guide pipe 33 is fixed to the end of the corrugated hose 32 away from the blowing shell 31, a trumpet 34 is fixed to the guide pipe 33, and a connecting plate 35 is fixed to the moving block 22 and the guide block 271. When the guide pipe 33 moves with the moving block 22 and the guide block 271, the corrugated hose 32 is subjected to force and extends or contracts, and can follow the movement to meet the needs of blowing air to different positions of the solar photovoltaic panel 15. The guide pipe 33 is fixedly connected to the connecting plate 35, and an air inlet pipe 38 is fixed to the end of the blowing shell 31 away from the corrugated hose 32. A filter screen 362 is fixed inside the air inlet pipe 38. The filter screen 362 can effectively prevent debris from external air from entering the interior of the blowing shell, thereby playing a dust-proof role.
[0040] Among them, a drive shaft 36 is rotatably connected inside the blowing shell 31, an impeller 361 is fixed on the drive shaft 36, a driving gear 37 is fixed to the output end of the drive motor 25, and the end of the drive shaft 36 away from the impeller 361 extends out of the blowing shell 31 and is fixed with a driven gear 371 that meshes with the driving gear 37.
[0041] When the moving block 22 and the guide block 271 move, the guide pipe 33 and the trumpet pipe 34 will move together. When the driving motor 25 works, the driving gear 37 will be driven to rotate. When the driving gear 37 rotates, the driven gear 371 will be driven to rotate, so that the driving shaft 36 drives the impeller 361 to rotate. The rotation of the impeller 361 generates a negative pressure inside the blowing shell 31, thereby sucking the external air into the blowing shell 31 through the air inlet pipe 38, and then entering the guide pipe 33 along the corrugated hose 32, and finally being blown out through the trumpet pipe 34 and blown onto the solar photovoltaic panel 15, so that the leaves and dust on the solar photovoltaic panel 15 are loosened or fall off, making it easier for the cleaning plate 24 and the rotating brush 282 to clean the leaves and dust, making it easier for the leaves and dust to be separated from the solar photovoltaic panel 15, reducing the cleaning pressure of the cleaning plate 24 and the rotating brush 282, and the generated blowing force can blow up floating debris such as dust, so that the floating debris such as dust is dispersed and secondary attachment is reduced.
[0042] Working Principle: When in use, multiple GNSS devices are installed in stress-sensitive areas of the rockfill dam. Depending on the size of the dam, a measuring point is usually set up every 50-100 meters. High-risk areas (such as near cracks in the dam body) require more frequent deployment. The GNSS monitoring device is used in conjunction with professional software to record raw observation data such as carrier phase and pseudorange. The data is pre-processed and displacement cloud maps of each section of the dam body are drawn based on the data to identify the maximum displacement area. The strain rate is calculated based on the displacement difference between adjacent measuring points. A stress inversion model is constructed based on the strain rate. After that, stress change characteristics are analyzed, and then stress change warnings and verification are carried out. Combined with data from stress gauges and inclinometers buried inside the dam body, the accuracy of the GNSS inverted stress is verified. When the stress change exceeds the threshold, an early warning report is automatically generated. Finally, the results are output and a report is generated. A GNSS monitoring database for rockfill dams is established to store raw data, processing results, and inversion model parameters to provide data support for long-term safety assessments. When the monitoring system needs to be cleaned during long-term use, the drive motor 25 is turned on, and the pulley 26 at its output end is driven by the drive motor 25. Then, under the action of the transmission belt 261, the pulley 26 at the end of the bidirectional screw rod 21 rotates, thereby causing the bidirectional screw rod 21 to rotate. When the bidirectional screw rod 21 rotates, the moving block 22 and the nut seat inside it are subjected to force, which causes the mounting bar 23 to be subjected to force. At the same time, it is restricted by the guide block 271 and the guide rod, so that the moving block 22 drives the mounting bar 23 to move back and forth inside the mounting frame. During the movement, the guide block 271 is in the The guide column 27 slides, and the installation bar 23 moves to drive the cleaning plate 24 to move. During the reciprocating movement of the cleaning plate 24, debris such as leaves and dust attached to the solar photovoltaic panel 15 can be scraped off, thereby reducing debris such as leaves and dust attached to the surface of the solar photovoltaic panel 15. At the same time, when the moving block 22 and the guide block 271 move, the rotating shaft 281 and the rotating brush 282 are driven to move together. When the rotating shaft 281 moves, under the action of the transmission gear 284 and the transmission rack 283, the rotating shaft 281 drives the rotating brush 282 to rotate. The reciprocating and rotating cleaning brush has a better cleaning effect. When the moving block 22 and the guide block 271 move, the guide pipe 33 and the trumpet pipe 34 will move together. When the driving motor 25 is working, the driving gear 37 will be driven to rotate. When the driving gear 37 rotates, the driven gear 371 will be driven to rotate, so that the driving shaft 36 drives the impeller 361 to rotate. The rotation of the impeller 361 generates negative pressure inside the blowing shell 31, thereby sucking the external air into the blowing shell 31 through the air inlet pipe 38, and then entering the guide pipe 33 along the corrugated hose 32, and finally blown out through the trumpet pipe 34 and blown onto the solar photovoltaic panel 15, so that the leaves and dust on the solar photovoltaic panel 15 are loosened or fall off, making it easier for the cleaning plate 24 and the rotating brush 282 to clean the leaves and dust, making it easier for the leaves and dust to be separated from the solar photovoltaic panel 15, reducing the cleaning pressure of the cleaning plate 24 and the rotating brush 282.
Claims
1. A method for detecting stress changes in a rockfill dam, characterized by: The method comprises the following steps: S1: Deploy GNSS monitoring devices in stress-sensitive areas of the rockfill dam; S2: Collect GNSS displacement data through GNSS monitoring device and perform preprocessing; S3: Draw displacement cloud maps of each section of the dam body and perform stress field inversion analysis based on the collected data; S4: Issue early warnings on stress changes and verify the accuracy of GNSS inversion stress; S5: Finally, output the results and generate a report.
2. A system for detecting stress changes in a rockfill dam, applying the method for detecting stress changes in a rockfill dam according to claim 1, comprising a support column (1), characterized in that: A mounting seat (11) is fixed to the lower end of the support column (1), a GNSS antenna (12) is installed on the upper end of the support column (1), a control box (13) and a support frame (14) are fixed on the support column (1), a solar photovoltaic panel (15) is fixed inside the support frame (14), the control box (13) and the GNSS antenna (12) and the solar photovoltaic panel (15) are all electrically connected, and a cleaning structure (2) and an air blowing structure (3) are provided on the support frame (14).
3. The system for detecting stress changes in rockfill dams according to claim 2, characterized in that: The cleaning structure (2) includes a bidirectional screw (21) rotatably connected to the inside of the support frame (14), a moving block (22) is installed on the bidirectional screw (21), a nut seat matching the bidirectional screw (21) is fixed inside the moving block (22), and the nut seat sleeve is arranged on the bidirectional screw (21), a mounting strip (23) is fixed on the side of the moving block (22), a cleaning plate (24) is fixed on the side of the mounting strip (23), and the cleaning plate (24) is an elastic rubber plate, a driving motor (25) is installed on the side of the support frame (14), and the driving motor (25) is electrically connected to the control box (13), and a rotating brush assembly (28) is provided on the side of the cleaning plate (24).
4. The system for detecting stress changes in rockfill dams according to claim 3, characterized in that: The output end of the driving motor (25) and the end of the bidirectional screw rod (21) are both fixed with pulleys (26), and the two pulleys (26) are connected to each other through a transmission belt (261).
5. The system for detecting stress changes in rockfill dams according to claim 3, characterized in that: A guide column (27) is fixed inside the support frame (14), a guide block (271) is slidably sleeved on the guide column (27), and one end of the mounting bar (23) away from the moving block (22) is fixedly connected to the guide block (271).
6. The system for detecting stress changes in rockfill dams according to claim 5, characterized in that: The rotating brush assembly (28) comprises a rotating shaft (281) rotatably connected between the moving block (22) and the guide block (271), and a rotating brush (282) is fixed on the rotating shaft (281).
7. The system for detecting stress changes in rockfill dams according to claim 6, characterized in that: A transmission rack (283) is fixed inside the support frame (14), and one end of the rotating shaft (281) close to the moving block (22) passes through the moving block (22) and is fixed with a transmission gear (284), which is meshed with the transmission rack (283).
8. The system for detecting stress changes in rockfill dams according to claim 5, characterized in that: The blowing structure (3) comprises a blowing shell (31) fixed inside the support frame (14), a corrugated hose (32) fixed on the blowing shell (31), a guide pipe (33) fixed to one end of the corrugated hose (32) away from the blowing shell (31), a trumpet pipe (34) fixed to the guide pipe (33), a connecting plate (35) fixed to both the moving block (22) and the guide block (271), the guide pipe (33) fixedly connected to the connecting plate (35), an air inlet pipe (38) fixed to one end of the blowing shell (31) away from the corrugated hose (32), a filter screen (362) fixed inside the air inlet pipe (38).
9. The system for detecting stress changes in rockfill dams according to claim 8, characterized in that: A drive shaft (36) is rotatably connected to the interior of the air blowing housing (31), an impeller (361) is fixed to the drive shaft (36), a driving gear (37) is fixed to the output end of the drive motor (25), and an end of the drive shaft (36) away from the impeller (361) extends out of the air blowing housing (31) and is fixed with a driven gear (371) meshing with the driving gear (37).