Hydropower station draft tube overhauling device and overhauling method

Abstract

The hydropower station draft tube overhauling device comprises an overhauling platform, an adjustable suspension arm and a draft tube entering door, the overhauling platform comprises a supporting table, a lifting protective fence, a pedal, a sensing assembly and a mounting frame used for mounting the supporting table, and the sensing assembly is arranged between the supporting table and the pedal; the adjustable suspension arm is used for suspending and controlling the space pose of the maintenance platform and comprises a first servo electric cylinder for adjusting the length of the suspension arm, a mounting assembly for mounting the adjustable suspension arm and an adjusting assembly for adjusting the angle of the adjustable suspension arm. The maintenance platform and the adjustable suspension arm are respectively connected with the draft tube inlet door through a mounting frame and a mounting assembly; according to the adjustable suspension arm, accurate adjustment of the length and the angle is achieved through the first servo electric cylinder and the adjusting assembly, the space pose of the maintenance platform can be flexibly controlled, the time of repeatedly adjusting the operation position by a maintainer is shortened, and the maintenance efficiency is improved.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of water turbine unit maintenance, in particular to a hydropower station tailrace pipe maintenance device and method. BACKGROUND

[0002] As a core component of the water turbine system, the tailrace pipe of the hydropower station directly undertakes the key role of guiding water flow discharge and recycling water flow energy, and its operating state is closely related to the power generation efficiency and equipment safety and stability of the hydropower station. Due to the long-term underwater working environment of the tailrace pipe, the inner wall continuously bears the effects of water flow scouring, silt abrasion and water quality corrosion, and is prone to gradually develop faults such as cracks, local damage and structural deformation. If not timely maintained, it may lead to water leakage, intensified energy loss, and even cause overall operation failure of the water turbine, so it is necessary to regularly carry out maintenance work on the tailrace pipe.

[0003] Currently, the devices used in the maintenance work of the tailrace pipe of the hydropower station have many shortcomings and cannot meet the efficient, safe and convenient maintenance requirements: The traditional platform lacks monitoring capability for the work process and cannot real-time master the platform bearing state and personnel activity. When overload or abnormal personnel movement occurs, it is difficult to give timely warning and there is a safety hazard. Moreover, the connection between the platform and the tailrace pipe relies on temporary welding or simple bolt fixation, which not only takes a long time to install and disassemble, but also easily damages the original structure of the tailrace pipe access door due to repeated operation.

[0004] In terms of suspension adjustment mechanism, the existing arm device for controlling the pose of the maintenance platform mostly adopts manual adjustment or single-dimensional mechanical adjustment, which has low adjustment accuracy and high operation difficulty, and it is difficult to accurately deliver the maintenance platform to the fault points at different positions in the tailrace pipe, so the maintenance personnel need to repeatedly adjust the work position, which greatly reduces the maintenance efficiency. In addition, the connection between the arm and the tailrace pipe access door lacks standardized installation structure and has poor adaptability. Different tailrace pipes of different types of hydropower stations need to be customized with different arm installation parts, which increases the maintenance cost and cycle. Therefore, we need to propose a hydropower station tailrace pipe maintenance device and method. SUMMARY

[0005] The purpose of the present application is to provide a hydropower station tailrace pipe maintenance device and method to solve the problems raised in the background.

[0006] To achieve the above purpose, the present application provides the following technical scheme: A hydropower station tailrace pipe maintenance device, comprising: A maintenance platform, the maintenance platform comprising a support table, a lifting guardrail, a pedal, a sensing assembly and a mounting rack for mounting the support table, the sensing assembly being arranged between the support table and the pedal; Adjustable boom for suspending and controlling the spatial pose of the maintenance platform, and comprising a first servo electric cylinder for adjusting the length of the boom, a mounting assembly for mounting the boom, and an adjusting assembly for adjusting the angle of the boom; The tail water pipe access door is provided with a mounting frame, and mounting threaded holes are formed in the mounting frame.

[0007] Preferably, the lifting guardrail comprises two electric push rods and a scissor-type guardrail, and the two electric push rod cylinders are mounted on the support table and connected with the scissor-type guardrail at the output ends.

[0008] Preferably, the sensing assembly comprises a plurality of pressure sensors and three accelerometers, mounting grooves are formed in the support table, one of the accelerometers is mounted in the middle of the pedal, and the other two accelerometers are mounted on both sides of the mounting grooves.

[0009] Preferably, limit blocks are arranged on both sides of the pedal, limit grooves are formed on both sides of the mounting grooves for sliding connection of the limit blocks, and a return spring is arranged in the mounting groove and connected with the pedal at the other end.

[0010] Preferably, the mounting bracket comprises a first L-shaped bracket, a first mounting plate, and a reinforcing rib, the two ends of the first L-shaped bracket are respectively connected with the support table and the first mounting plate, first threaded holes corresponding to the mounting threaded holes are formed in the first mounting plate, and the two ends of the reinforcing rib are respectively connected with the support table and the first L-shaped bracket.

[0011] Preferably, the mounting assembly comprises a second L-shaped bracket and a second mounting plate, the second L-shaped bracket is fixedly connected with the first mounting plate, and second threaded holes corresponding to the mounting threaded holes are formed in the second mounting plate.

[0012] Preferably, the adjusting assembly comprises a second servo electric cylinder, a first rotating block, a second rotating block, a moving block, a sliding block, and two side blocks, the cylinder end of the second servo electric cylinder is connected with one end of the second L-shaped bracket, the two side blocks are fixedly connected with the other end of the second L-shaped bracket, the first rotating block and the second rotating block are respectively connected with the output end of the second servo electric cylinder and one end of the second L-shaped bracket, the sliding block is connected with the moving block, and a sliding groove is formed in the second L-shaped bracket for sliding connection of the sliding block, the first rotating block is rotatably connected with the moving block, and the second rotating block is rotatably connected between the two side blocks.

[0013] Preferably, the cylinder end of the first servo cylinder is connected with a suspension block, and the output end of the first servo cylinder is connected with a diagonal steel away from the second rotating block, and the suspension block and the diagonal steel are both provided with lifting rings.

[0014] Preferably, the sensing assembly is electrically connected with the first servo cylinder, the electric push rod, the second servo cylinder, the pressure sensor and the accelerometer, and the sensing assembly comprises a storage battery, an industrial single-board computer, a power management module, a communication gateway module, a data acquisition module, a drive output module and a storage module.

[0015] A method for overhauling a water power station tail water pipe overhaul device, comprising a water power station tail water pipe overhaul device and the following method steps: S1, pretreatment and platform deployment: open the tail water pipe access door, flush the inner wall of the tail water pipe by a high-pressure water gun to remove attachments; start the parallel drainage system and cooperatively work through the main and auxiliary drainage ports to empty the accumulated water in the tail water pipe; then, the overhaul platform and the adjustable boom are fixed on the mounting frame and the mounting assembly of the tail water pipe access door through the mounting frame and the mounting assembly, the lifting guardrail is started to the working state, and the operator enters the overhaul platform; S2, intelligent lowering and overhaul operation: the length and angle of the adjustable boom are adjusted by controlling the first servo cylinder and the second servo cylinder to stably lower the manned overhaul platform to the designated operation position in the tail water pipe; during the lowering and operation process, the sensing assembly collects load distribution, acceleration and platform attitude data in real time, and the industrial single-board computer processes the data; if the monitoring data exceeds the preset safety threshold, the system automatically triggers an audible and light alarm, and locks or adjusts the adjustable boom through the drive output module to forcibly maintain the stability of the platform; the operator repairs the damaged part of the inner wall of the tail water pipe on the stable platform; S3, quality verification and closed-loop detection: after the repair operation is completed, the operator uses non-destructive testing equipment to detect the internal quality of the repaired part, and uses a pressure testing device to verify the sealing performance; the data generated during the detection process is transmitted to the external control center in real time through the communication gateway module; S4, data archiving and system recycling: the operation data, sensor monitoring data, non-destructive testing results and pressure testing data of this overhaul are time-stamped, stored in the storage module and uploaded to the external database to establish a digital overhaul archive; after all the operations are completed, the adjustable boom stably lifts the overhaul platform to the initial position.

[0016] Compared with the prior art, the beneficial effects of the present application are: 1、The present application can monitor the platform bearing state and personnel activity in real time by setting a sensing assembly on the maintenance platform, and can respond to risks such as overload or abnormal movement of personnel in time in combination with the dynamic protection function of the lifting protective fence, greatly improving the safety of maintenance operation; at the same time, the maintenance platform and the adjustable boom are connected with the installation frame, the installation assembly and the installation frame of the draft tube access door in a standardized manner, avoiding damage to the access door structure by traditional temporary welding or simple fixing method, and being convenient to disassemble and assemble, reducing the operation difficulty.

[0017] 2、The adjustable boom of the present application realizes precise adjustment of length and angle through the first servo cylinder and the adjusting assembly, can flexibly control the spatial pose of the maintenance platform, and is convenient for quickly and accurately delivering the maintenance platform to fault points at different positions in the draft tube, reducing the time of repeatedly adjusting the operation position of the maintenance personnel, and significantly improving the maintenance efficiency; in addition, the standardized installation structure enables the device to adapt to draft tube access doors of different models, reduces the customization cost, and enhances the universality of the device. BRIEF DESCRIPTION OF DRAWINGS

[0018] Figure 1 is a structural schematic diagram of the present application; Figure 2 is a cross-sectional structural schematic diagram of the maintenance platform of the present application; Figure 3 is an exploded structural schematic diagram of the adjustable boom of the present application; Figure 4 is an exploded structural schematic diagram of the maintenance platform of the present application; Figure 5 is a flow chart of the method of the present application.

[0019] In the figure: 1, support table; 2, pedal; 3, first servo cylinder; 4, draft tube access door; 5, installation frame; 6, installation threaded hole; 7, electric push rod; 8, scissor type protective fence; 9, pressure sensor; 10, accelerometer; 11, installation groove; 12, limit block; 13, limit groove; 14, first L-shaped frame; 15, first mounting plate; 16, reinforcing rib; 17, first threaded hole; 18, second L-shaped frame; 19, second mounting plate; 20, second threaded hole; 21, diagonal steel; 22, second servo cylinder; 23, first rotating block; 24, second rotating block; 25, moving block; 26, sliding block; 27, side block; 28, sliding groove; 29, suspension block; 30, lifting ring; 31, battery; 32, industrial single board computer; 33, power management module; 34, communication gateway module; 35, data acquisition module; 36, drive output module; 37, storage module. DETAILED DESCRIPTION

[0020] With reference to the drawings of the embodiments of the present application, the technical solutions in the embodiments of the present application will be described clearly and completely. Obviously, the described embodiments are only a part of the embodiments of the present application, rather than all the embodiments of the present application. Based on the embodiments of the present application, all the other embodiments obtained by those skilled in the art without creative work fall within the scope of the present application.

[0021] Embodiment 1 Please refer to Figures 1-4 The present application provides a technical solution: A water power station tail water pipe overhauling device, comprising: An overhauling platform, the overhauling platform comprising a support table 1, a lifting guardrail, a pedal 2, a sensing assembly and a mounting rack for mounting the support table 1, the mounting rack comprising a first L-shaped rack 14, a first mounting plate 15 and a reinforcing rib 16, the first L-shaped rack 14 being connected with the support table 1 and the first mounting plate 15 at two ends respectively, and the first mounting plate 15 being provided with a first threaded hole 17 corresponding to the mounting threaded hole 6, and the reinforcing rib 16 being connected with the support table 1 and the first L-shaped rack 14 at two ends respectively, and the sensing assembly being arranged between the support table 1 and the pedal 2. Specifically, the lifting guardrail comprises two electric push rods 7 and a scissor-type guardrail 8, and the cylinder bodies of the two electric push rods 7 are mounted on the support table 1, and the output ends of the electric push rods 7 are connected with the scissor-type guardrail 8.

[0022] The sensing assembly comprises a plurality of pressure sensors 9 and three accelerometers 10, the support table 1 is provided with a mounting groove 11, the plurality of pressure sensors 9 are mounted between the support table 1 and the pedal 2, one of the three accelerometers 10 is mounted in the middle of the pedal 2, and the other two accelerometers 10 are mounted on the two sides of the mounting groove 11, the pedal 2 is provided with a limiting block 12 on each side, the mounting groove 11 is provided with a limiting groove 13 on each side for sliding connection of the limiting block 12, and a reset spring is arranged in the mounting groove 11 and connected with the pedal 2 at the other end.

[0023] In the maintenance operation stage, after the maintenance personnel steps on the pedal 2, the limiting blocks 12 on both sides of the pedal 2 slide along the limiting grooves 13 of the installation grooves 11, and the reset springs in the installation grooves 11 adaptively adjust the stress to prevent the pedal 2 from tilting, which ensures the standing stability of the personnel through the cooperative action of the mechanical structure; at the same time, through the control terminal instruction, the first servo cylinder 3 (adjusting the length) and the adjusting assembly (adjusting the angle) driven by the second servo cylinder 22 of the lifting arm are cooperatively actuated, and the maintenance platform is accurately delivered to the area to be maintained relying on the length + angle double-dimension adjusting principle; the lifting protective fence which is synchronously started is expanded through the electric push rod 7 to drive the scissor-type protective fence 8 to form a safety barrier. In this stage, the double-dimension adjustment of the lifting arm greatly reduces the time for personnel to adjust the operation position, and the standardized installation and the quick adjustment mechanism jointly improve the maintenance efficiency, and the limiting and resetting structure of the pedal 2 further enhances the operation safety.

[0024] The adjustable lifting arm is used for suspending and controlling the spatial pose of the maintenance platform, and comprises the first servo cylinder 3 for adjusting the length of the adjustable lifting arm, the installation assembly for installing the adjustable lifting arm, and the adjusting assembly for adjusting the angle of the adjustable lifting arm. The adjusting assembly comprises the diagonal square steel 21, the second servo cylinder 22, the first rotating block 23, the second rotating block 24, the moving block 25, the sliding block 26, and the two side blocks 27. The cylinder body end of the second servo cylinder 22 is connected with one end of the second L-shaped frame 18, and the two side blocks 27 are fixedly connected with the other end of the second L-shaped frame 18. The first rotating block 23 and the second rotating block 24 are respectively connected with the output end of the second servo cylinder 22 and one end of the diagonal square steel 21. The sliding block 26 is connected with the moving block 25, and a sliding groove 28 for sliding connection of the sliding block 26 is formed in the diagonal square steel 21. The first rotating block 23 is rotationally connected with the moving block 25, and the second rotating block 24 is rotationally connected between the two side blocks 27. The cylinder body end of the first servo cylinder 3 is connected with the suspension block 29, and the output end of the first servo cylinder 3 is connected with the end of the diagonal square steel 21 away from the second rotating block 24. The suspension block 29 and the diagonal square steel 21 are each provided with a lifting ring 30. In the system debugging stage, after the battery 31 of the sensing assembly is powered on, the industrial single-board computer 32 activates the data acquisition module 35, initializes the pressure sensor 9 and the three accelerometers 10, and ensures that the pedal 2 load monitoring and personnel movement trajectory monitoring functions are normal. At the same time, the adjustable lifting arm is debugged, the length adjustment accuracy is verified by controlling the first servo cylinder 3, and the adjusting assembly (diagonal square steel 21, sliding block 26, rotating block, etc.) is driven by the second servo cylinder 22 to check the angle adjustment flexibility. The core principle of this process is to ensure the accuracy of the “monitoring-adjustment” system through the initialization of the sensing assembly and the verification of the lifting arm adjustment mechanism, to provide protection for subsequent efficient operation and safety protection. Precise sensors and lifting arm debugging directly improve the efficiency of subsequent maintenance operations and avoid repeated adjustments due to equipment errors.

[0025] The tail water pipe access door 4 is provided with a mounting frame 5, and the mounting frame 5 is provided with a mounting threaded hole 6. The maintenance platform and the adjustable hoist arm are connected with the tail water pipe access door 4 through a mounting rack and a mounting assembly respectively. The mounting assembly comprises a second L-shaped frame 18 and a second mounting plate 19. The second L-shaped frame 18 is fixedly connected with the first mounting plate 15, and the second mounting plate 19 is provided with a second threaded hole 20 corresponding to the mounting threaded hole 6.

[0026] When the device is installed, the mounting frame 5 of the tail water pipe access door 4 is taken as a unified reference. The mounting rack of the maintenance platform is threadedly connected with the mounting frame 5 through the first threaded hole 17 of the first mounting plate 15, and the connection strength between the first L-shaped frame 14 and the support table 1 is enhanced by the reinforcing rib 16. The mounting assembly of the adjustable hoist arm is fixed with the mounting frame 5 through the second threaded hole 20 of the second mounting plate 19, and the second L-shaped frame 18 is connected with the first mounting plate 15 to form an integrated installation structure. This process relies on the working principle of standardized threaded connection, ensures the installation accuracy of the maintenance platform and the adjustable hoist arm, avoids the damage to the access door structure caused by traditional temporary welding or customized installation, enhances the adaptability of the device to different models of tail water pipe access doors 4, reduces the use cost without the need for additional customized special parts, and improves the overall bearing stability through the structural design of the reinforcing rib 16, the square steel 21 and the like, thereby laying a safe foundation for subsequent operations.

[0027] In the operation process: the pressure sensor 9 of the sensing assembly senses the load distribution in real time, the three accelerometers 10 capture the moving track of the personnel, and the data is collected to the industrial single-board computer 32 for analysis through the data acquisition module 35; if overload or abnormal movement is identified, the computer immediately triggers linkage through the drive output module 36, the electric push rod 7 is raised to the highest position, and the first servo cylinder 3 and the second servo cylinder 22 are locked to stop the adjustment of the hoist arm. The closed-loop control principle of “monitoring-judgment-linkage” forms a double safety system of “active monitoring + passive protection”, which effectively avoids safety accidents; after the abnormality is eliminated, the system automatically restores the hoist arm adjustment function, thereby ensuring the continuity of the operation.

[0028] In the above embodiment, the sensing assembly is electrically connected with the first servo cylinder 3, the electric push rod 7, the second servo cylinder 22, the pressure sensor 9 and the accelerometer 10. The sensing assembly comprises a storage battery 31, an industrial single-board computer 32, a power management module 33, a communication gateway module 34, a data acquisition module 35, a drive output module 36 and a storage module 37.

[0029] Further, in view of the harsh working conditions of high humidity, possible oil mist and corrosive medium inside the tail water pipe of the hydropower station, all electrical elements and mechanical structures of the device are designed with waterproof, moisture-proof and corrosion-resistant design: Key electrical components protection: the first servo cylinder 3, the second servo cylinder 22, the electric push rod 7, the pressure sensor 9, the accelerometer 10, the industrial single board computer 32 and other electrical modules are all selected from products with a protection level not less than IP67 to ensure that they can effectively prevent water and dust from entering and meet the operation requirements in a short-term humid environment.

[0030] Connection line and interface sealing: all external electrical connection cables use double-sealing ring waterproof connectors, and waterproof sealant (such as silicone rubber) is applied at the interface after installation to form a secondary protection. The cable itself is a corrosion-resistant and oil-resistant neoprene jacketed cable.

[0031] Surface treatment of structural parts: the support table 1, the mounting rack (the first L-shaped bracket 14, the first mounting plate 15), the mounting assembly (the second L-shaped bracket 18, the second mounting plate 19), the adjusting assembly (the oblique square steel 21, the moving block 25, etc.) and other metal structural parts are all subjected to corrosion protection treatment. The preferred treatment method is to first perform hot-dip galvanizing and then coat an epoxy resin anticorrosive finish to form a double protective layer to resist water vapor and chemical corrosion.

[0032] Electronic cabin sealing: the core control unit of the sensing assembly (including the battery 31, the industrial single board computer 32, the power management module 33, etc.) is integrated in a sealed waterproof control box, and the control box is installed on the support table 1. The control box can be made of stainless steel, and a sealing washer is provided at the interface of the box body to ensure the dryness and safety of the internal environment.

[0033] Example 2: For reference Figure 5 The difference between this embodiment 2 and embodiment 1 is: A method for maintaining a water power station tail water pipe maintenance device, comprising a water power station tail water pipe maintenance device and the following method steps: S1, pretreatment and platform deployment: Open the tail water pipe access door 4, first use a high-pressure water gun to thoroughly flush the inner wall of the tail water pipe to remove silt, aquatic organisms and other residues attached to the pipe wall; then start and operate the drainage system, use the high-flow submersible pump to completely drain the accumulated water in the tail water pipe through the main drainage port and the auxiliary drainage port; After completing the pretreatment, the maintenance platform is fixedly connected to the installation frame, the adjustable boom and the installation assembly of the tail water pipe access door 4 through the installation frame, the adjustable boom and the installation assembly, respectively, to ensure that the installation screw holes 6 are aligned with the first screw holes 17 and the second screw holes 20 and are fastened by high-strength bolts; Connect the system power supply, start the electric push rod 7 of the lifting protective fence, drive the scissor-type protective fence 8 to smoothly rise to the designed height, form a closed operation safety area, and then the operator enters the maintenance platform to prepare for operation; S2, intelligent lowering and safe operation: The first servo cylinder 3 and the second servo cylinder 22 are respectively controlled by the control system: the first servo cylinder 3 is extended and retracted to adjust the suspension length of the boom; the second servo cylinder 22 drives the adjusting assembly to change the working angle of the boom through the unique oblique square steel 21 and the slider 26 mechanism, so as to realize the accurate and stable adjustment of the space pose of the maintenance platform inside the draft tube, and lower the platform to the predetermined working position; During the whole lowering and static operation process, the sensing components integrated in the platform continuously work: the pressure sensor 9 matrix monitors the load distribution of the platform in real time, the three accelerometers 10 monitor the acceleration, inclination and vibration data of the middle and both sides of the platform; the industrial single-board computer 32 receives and processes these sensing data in real time, and runs the built-in safety control algorithm; if any monitoring parameter (such as total load, inclination, vibration amplitude) exceeds the preset safety threshold, the system will automatically trigger the sound and light alarm device through the drive output module 36, and at the same time, send instructions to the first servo cylinder 3 and the second servo cylinder 22, lock the current state or execute the reverse adjustment action, to actively offset the unstable trend and forcibly maintain the platform in a safe and stable state; After confirming the stability of the platform, the operator uses the tools carried by the platform to perform grinding, welding, repair and other operations on the damaged parts such as cracks and cavitation erosion on the inner wall of the draft tube; S3, quality verification and closed-loop detection: After all the repair work is completed, enter the quality verification stage: the operator uses an ultrasonic flaw detector or / and a radiographic flaw detector to perform non-destructive testing on the internal quality of the repaired area to detect whether there are defects such as incomplete fusion, pores and cracks; then, a special pressure test equipment is used to verify the sealing performance of the repaired part to ensure that it can meet the pressure bearing and anti-seepage requirements under the operating conditions; All the detection data and results generated in this step are uploaded in real time to the external control center located on the ground through the communication gateway module 34 for remote review and archiving by the supervisor; S4, data archiving and system recycling: The data acquisition module 35 integrates the multi-source data generated during the whole operation process (including operation time, operation log, real-time monitoring data of sensors, non-destructive testing report, pressure test result) and binds accurate time stamp; the storage module 37 records these data locally, and uploads them to the external database server through the communication gateway module 34 to form a complete and traceable digital maintenance archive, which provides data support for the state evaluation and predictive maintenance of the equipment; After all the maintenance and verification work is completed, the adjustable boom is controlled to smoothly lift the maintenance platform to the draft tube entrance 4, the operator leaves the platform, the power is turned off, the scissor-type protective fence 8 is lowered, and the maintenance platform and the adjustable boom are disassembled.

[0034] While embodiments of the application have been shown and described, it is to be understood that the application is not limited to the details of the embodiments described, since numerous changes, modifications, substitutions and variations can be made thereto without departing from the spirit and scope of the application as defined by the appended claims and their equivalents.

Claims

1. A maintenance device for the tailrace pipe of a hydropower station, characterized in that, include: The maintenance platform includes a support platform (1), a lifting guardrail, a pedal (2), a sensing component, and a mounting bracket for mounting the support platform (1). The sensing component is disposed between the support platform (1) and the pedal (2). An adjustable boom is used to suspend and control the spatial position of the maintenance platform. The adjustable boom includes a first servo electric cylinder (3) for adjusting the boom length, an installation component for installing the adjustable boom, and an adjustment component for adjusting the angle of the adjustable boom. Tailwater inlet gate (4) is provided with an installation frame (5) and an installation threaded hole (6) is provided on the installation frame (5). The maintenance platform and the adjustable boom are respectively connected to the tailwater inlet gate (4) through the installation bracket and the installation assembly.

2. The tailrace pipe maintenance device for a hydropower station according to claim 1, characterized in that: The lifting guardrail includes two electric push rods (7) and a scissor guardrail (8). The cylinders of the two electric push rods (7) are mounted on the support platform (1), and the output end of the electric push rods (7) is connected to the scissor guardrail (8).

3. The tailrace pipe maintenance device for a hydropower station according to claim 2, characterized in that: The sensing component includes several pressure sensors (9) and three accelerometers (10). The support platform (1) has a mounting groove (11). Several pressure sensors (9) are installed between the support platform (1) and the pedal (2). One accelerometer (10) is installed in the middle of the pedal (2), and the other two accelerometers (10) are installed on both sides of the mounting groove (11).

4. The tailrace pipe maintenance device for a hydropower station according to claim 3, characterized in that: The pedal (2) is provided with limiting blocks (12) on both sides, and the mounting groove (11) is provided with limiting grooves (13) on both sides for the limiting blocks (12) to slide and connect.

5. The tailrace pipe maintenance device for a hydropower station according to claim 1, characterized in that: The mounting frame includes a first L-shaped frame (14), a first mounting plate (15), and a reinforcing rib (16). The two ends of the first L-shaped frame (14) are connected to the support platform (1) and the first mounting plate (15) respectively. The first mounting plate (15) is provided with a first threaded hole (17) corresponding to the mounting threaded hole (6). The two ends of the reinforcing rib (16) are connected to the support platform (1) and the first L-shaped frame (14) respectively.

6. A tailrace pipe maintenance device for a hydropower station according to claim 3, characterized in that: The mounting assembly includes a second L-shaped bracket (18) and a second mounting plate (19). The second L-shaped bracket (18) is fixedly connected to the first mounting plate (15), and the second mounting plate (19) has a second threaded hole (20) corresponding to the mounting threaded hole (6).

7. A tailrace pipe maintenance device for a hydropower station according to claim 6, characterized in that: The adjustment assembly includes a rhomboid steel (21), a second servo electric cylinder (22), a first rotating block (23), a second rotating block (24), a moving block (25), a slider (26), and two side blocks (27). The cylinder end of the second servo electric cylinder (22) is connected to one end of the second L-shaped frame (18), and the two side blocks (27) are fixedly connected to the other end of the second L-shaped frame (18). The first rotating block (23) and the second rotating block (24) are respectively connected to the output end of the second servo electric cylinder (22) and one end of the rhomboid steel (21). The slider (26) is connected to the moving block (25), and a groove (28) is provided on the rhomboid steel (21) for the slider (26) to slide. The first rotating block (23) is rotatably connected to the moving block (25), and the second rotating block (24) is rotatably connected between the two side blocks (27).

8. A tailrace pipe maintenance device for a hydropower station according to claim 7, characterized in that: The first servo electric cylinder (3) has a suspension block (29) connected to its cylinder body end, and the output end of the first servo electric cylinder (3) is connected to the end of the oblique steel (21) away from the second rotating block (24). Both the suspension block (29) and the oblique steel (21) are provided with lifting rings (30).

9. A tailrace pipe maintenance device for a hydropower station according to claim 8, characterized in that: The sensing component is electrically connected to the first servo cylinder (3), the electric push rod (7), the second servo cylinder (22), the pressure sensor (9), and the accelerometer (10). The sensing component includes a battery (31), an industrial single-board computer (32), a power management module (33), a communication gateway module (34), a data acquisition module (35), a drive output module (36), and a storage module (37).

10. A method for overhauling a tailrace pipe maintenance device in a hydropower station, characterized in that, Includes a tailrace pipe maintenance device for a hydropower station as described in any one of claims 1 to 9, and the following method steps: S1. Pretreatment and platform deployment: Open the tailwater pipe inlet gate (4) and flush the inner wall of the tailwater pipe with a high-pressure water gun to remove the attached substances; start the parallel drainage system and drain the water in the tailwater pipe through the coordinated operation of the main and auxiliary drain outlets; then, fix the maintenance platform and adjustable boom to the mounting frame (5) of the tailwater pipe inlet gate (4) through the mounting bracket and mounting components, start the lifting guardrail to the working state, and the operator enters the maintenance platform; S2. Intelligent lowering and maintenance operation: By controlling the first servo cylinder (3) and the second servo cylinder (22), the length and angle of the adjustable boom are adjusted to smoothly lower the manned maintenance platform to the designated work position inside the tailwater pipe; during the lowering and operation, the sensing components collect load distribution, acceleration and platform attitude data in real time, and process them by the industrial single-board computer (32); if the monitoring data exceeds the preset safety threshold, the system automatically triggers an audible and visual alarm, and locks or adjusts the adjustable boom through the drive output module (36) to forcibly maintain the stability of the platform; the operator repairs the damaged parts of the inner wall of the tailwater pipe on the stable platform; S3. Quality verification and closed-loop testing: After the repair work is completed, the operator uses non-destructive testing equipment to test the internal quality of the repaired part and uses pressure testing equipment to verify the sealing performance; the data generated during the testing process is transmitted to the external control center in real time through the communication gateway module (34); S4. Data archiving and system recycling: The operation data, sensor monitoring data, non-destructive testing results and pressure test data of this maintenance are bound to timestamps, stored in the storage module (37) and uploaded to the external database to establish a digital maintenance archive; after all operations are completed, the adjustable boom is controlled to smoothly lift the maintenance platform to the initial position.

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