Hydropower station draft tube overhauling device and overhauling method

Abstract

The invention relates to the technical field of hydropower unit maintenance, in particular to a hydropower station draft tube maintenance device and method, the maintenance device comprises a hoisting assembly and a platform assembly, and the hoisting assembly and the platform assembly are connected with a draft tube inlet door through detachable fasteners; the hoisting assembly comprises two sets of hoisting arm assemblies symmetrically arranged on the draft tube inlet door, each hoisting arm assembly comprises a foundation plate, horizontal square steel and oblique square steel, and the foundation plates, the horizontal square steel and the oblique square steel form a triangular supporting frame structure used for providing suspension supporting. The platform assembly comprises a pedal and two sets of connecting assemblies symmetrically arranged at the top of the pedal, first connecting pieces are arranged on the periphery of the pedal, and the pedal and the two sets of connecting assemblies form a Z-shaped supporting frame structure through the first connecting pieces. The technical problems that the maintenance efficiency of the draft tube is low and the risk is high are solved.

Description

Technical Field

[0001] The present invention relates to the technical field of maintenance of hydroelectric generating units, and particularly relates to a maintenance device and a maintenance method for a draft tube of a hydropower station. Background Technique

[0002] In the operation system of a hydropower station, the draft tube is an important flow-through component of the water turbine, and its bottom equipment is in a harsh working condition for a long time. High-speed water flow carries particulate matter such as sediment, continuously scouring and eroding the surface of the bottom equipment of the draft tube, seriously damaging the equipment performance, and then significantly reducing the energy conversion efficiency of the water turbine and affecting its operation stability. To ensure the efficient, safe and stable operation of the hydropower station unit, it has become a key measure to ensure reliable power supply of the hydropower system to timely discover and handle potential fault hidden dangers of the bottom equipment of the draft tube and conduct regular and comprehensive maintenance on it.

[0003] Currently, the maintenance of the draft tube mainly adopts the operation method of building a maintenance platform inside. This platform serves as a transition carrier for personnel to reach the bottom of the draft tube for equipment inspection. However, due to the large vertical height difference between the position where the maintenance platform is built and the bottom of the draft tube, during the process of building and dismantling the platform, the operators need to be in a high-altitude operation state for a long time, facing a high risk of falling from a height. In addition, the construction technology of the maintenance platform is complex and requires a large number of professional personnel to cooperate in the operation, which not only leads to high labor costs, but also the entire process of building and dismantling takes a long time, seriously reducing the maintenance efficiency. Summary of the Invention

[0004] In order to solve the technical problems of low maintenance efficiency and high risk of the draft tube, the present invention provides a maintenance device and a maintenance method for a draft tube of a hydropower station, and the specific technical solutions adopted are as follows:

[0005] The technical solution of the first aspect of the present invention provides a maintenance device for a draft tube of a hydropower station, including a hoisting component and a platform component, and the hoisting component and the platform component are respectively connected to the access door of the draft tube through detachable fasteners;

[0006] The hoisting component includes two groups of boom components symmetrically arranged on the access door of the draft tube, and each boom component includes a base plate, a horizontal square steel and an inclined square steel, and the base plate, the horizontal square steel and the inclined square steel form a triangular support frame structure for providing suspension support;

[0007] The platform component includes a pedal and two groups of connecting components symmetrically arranged on the top of the pedal. First connectors are respectively arranged around the pedal, and the pedal and the two groups of connecting components form a Z-shaped support frame structure through the first connectors.

[0008] Further, in the triangular support frame structure of the boom assembly, the included angle between the diagonal square steel and the base plate is an acute angle, and triangular reinforcement plates are respectively provided at the joints between the base plate, the horizontal square steel, and the diagonal square steel.

[0009] Further, at least one first lifting ring is provided at one end of the diagonal square steel away from the base plate, at least one second lifting ring is provided in the middle section of the horizontal square steel, the first lifting ring is used for hanging a fall prevention device or an electric lifting device, the second lifting ring is used for fixing a safety belt hook, and a handle is further provided on the outer side of the diagonal square steel.

[0010] Further, in the Z-shaped support frame structure of the platform assembly, the two sets of connection components are fixedly connected by a cross beam. The connection component includes a second connecting piece and a third connecting piece. The first connecting piece is used for bearing the weight of the pedal, the top of the first connecting piece is fixedly connected with the second connecting piece, one end of the third connecting piece is fixedly connected with the end of the second connecting piece away from the first connecting piece, and the third connecting piece extends to the side away from the pedal and is fixedly connected with the tail water pipe inlet gate through a reinforcing plate.

[0011] Further, a first diagonal reinforcing square steel is further provided between the second connecting piece and the first connecting piece, a second diagonal reinforcing square steel is further provided between the bottom of the first diagonal reinforcing square steel and the first connecting piece, and a handrail is further provided on the surface of the first diagonal reinforcing square steel.

[0012] Further, a third lifting ring for fixing a safety belt hook is further provided on the top of the third connecting piece, a plurality of triangular plates are provided between the third connecting piece and the reinforcing plate, the reinforcing plate is of a trapezoidal structure and a plurality of connection holes are provided on the reinforcing plate.

[0013] Further, a Z-shaped reinforcing plate is further provided between the second connecting piece, the third connecting piece, and the first diagonal reinforcing square steel, and the Z-shaped reinforcing plate is fixedly connected with the second connecting piece, the third connecting piece, and the first diagonal reinforcing square steel respectively.

[0014] Further, anti-slip patterns are provided on the surface of the pedal.

[0015] The technical solution of the second aspect of the present invention provides a method for overhauling a tail water pipe of a hydropower station, including the tail water pipe overhaul device of the technical solution of the first aspect of the present invention, and the method includes:

[0016] Symmetrically fix two sets of boom assemblies on both sides of the tail water pipe inlet gate, and connect the base plate of the boom assembly to the tail water pipe inlet gate through detachable fasteners;

[0017] Assemble the pedal into a Z-shaped support frame through the first connecting piece and two sets of connection components, and fix the connection components inside the tail water pipe inlet gate through detachable fasteners;

[0018] Suspend the anti - falling device and the electric lifting device on two groups of boom components respectively;

[0019] The operator enters the pedal and uses the safety belt hook to connect with the anti - falling device and the electric lifting device, and repairs the inside of the draft tube by ascending and descending along the boom component through the electric lifting device.

[0020] Furthermore, the method further includes: during the ascending and descending process of the operator, the vibration sensors installed on the boom component and the platform component are used to collect the vibration data of the boom component and the platform component in real - time;

[0021] Based on the frequency - spectrum analysis result of the vibration data, judge the resonance frequency offset of the boom component and the platform component; if the resonance frequency offset exceeds the preset threshold, automatically trigger the emergency braking of the electric lifting device and send an alarm signal.

[0022] The present invention has the following beneficial effects:

[0023] The draft - tube maintenance device provided by the present invention, by configuring modular hoisting components and platform components, the boom component of the hoisting component is composed of a base plate, a horizontal square steel and an inclined square steel to provide a triangular support frame structure for suspension and support; the pedal of the platform component and two groups of connecting components form a Z - shaped support frame structure through the first connecting piece; the overall structure is simple and the load - bearing stability is strong; in actual use, two groups of boom components are symmetrically fixed on both sides of the draft - tube access door, and the base plate of the boom component is connected to the draft - tube access door through detachable fasteners; the pedal is assembled with two groups of connecting components into a Z - shaped support frame through the first connecting piece, and the connecting components are fixed inside the draft - tube access door through detachable fasteners; the anti - falling device and the electric lifting device are respectively suspended on two groups of boom components; the operator enters the pedal and uses the safety belt hook to connect with the anti - falling device and the electric lifting device, and repairs the inside of the draft tube by ascending and descending along the boom component through the electric lifting device. This draft - tube maintenance device only needs to connect the hoisting component and the platform component with the draft - tube access door through detachable fasteners to repair the bottom of the draft tube, which solves the problems of the cumbersome operation process and long time consumption of the traditional temporary erection of the maintenance platform for the draft - tube maintenance, improves the maintenance efficiency while reducing the high - altitude operation time of the operators, and the triangular support frame structure and the Z - shaped support frame structure enhance the operation safety. Description of the Drawings

[0024] In order to more clearly illustrate the technical solutions and advantages in the embodiments of the present invention or the prior art, the following will briefly introduce the drawings required for the description of the embodiments or the prior art. Obviously, the drawings in the following description are only some embodiments of the present invention. For those of ordinary skill in the art, without creative efforts, other drawings can be obtained based on these drawings.

[0025] Figure 1 Schematic diagram of the overall structure of the overhaul device for the draft tube of a hydropower station provided by an embodiment of the present invention;

[0026] Figure 2 Schematic diagram of the structure of the boom assembly provided by an embodiment of the present invention;

[0027] Figure 3 Schematic diagram of the structure of the platform assembly provided by an embodiment of the present invention;

[0028] Figure 4 Method flow chart of the overhaul method for the draft tube of a hydropower station provided by an embodiment of the present invention;

[0029] Icons: 100 - boom assembly, 110 - base plate, 120 - horizontal square steel, 130 - diagonal square steel, 140 - triangular reinforcement plate, 150 - first lifting ring, 160 - second lifting ring, 170 - handle, 200 - pedal, 210 - first connecting piece, 220 - cross beam, 300 - connecting assembly, 310 - second connecting piece, 320 - third connecting piece, 321 - third lifting ring, 322 - triangular plate, 330 - reinforcement plate, 331 - connecting hole, 340 - first obliquely reinforced square steel, 350 - second obliquely reinforced square steel, 360 - handrail, 370 - Z-shaped reinforcement plate, 400 - access door to the draft tube. Detailed implementation manners

[0030] In order to further elaborate on the technical means and effects adopted by the present invention to achieve the intended invention purpose, the following combines the drawings and preferred embodiments to elaborate in detail on a hydropower station draft tube overhaul device and overhaul method proposed according to the present invention, including its specific implementation manners, structures, features, and effects. In the following description, different "one embodiment" or "another embodiment" do not necessarily refer to the same embodiment. In addition, the specific features, structures, or characteristics in one or more embodiments can be combined in any suitable form.

[0031] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by those skilled in the technical field to which the present invention belongs.

[0032] The following specifically describes the specific solutions of a hydropower station draft tube overhaul device and overhaul method provided by the present invention with reference to the drawings.

[0033] Please refer to Figure 1, which shows a schematic diagram of the overall structure of the overhaul device for the draft tube of a hydropower station provided by an embodiment of the present invention. The overhaul device for the draft tube of the hydropower station includes a hoisting assembly and a platform assembly, and the hoisting assembly and the platform assembly are respectively connected to the draft tube access door 400 through detachable fasteners; the hoisting assembly includes two groups of boom assemblies 100 symmetrically arranged on the draft tube access door 400, and the boom assembly 100 includes a base plate 110, a horizontal square steel 120 and an inclined square steel 130. The base plate 110, the horizontal square steel 120 and the inclined square steel 130 are welded to form a triangular support frame structure for providing suspension support; the platform assembly includes a pedal 200 and two groups of connection assemblies 300 symmetrically arranged on the top of the pedal 200. First connectors 210 are respectively arranged around the pedal 200, and the pedal 200 and the two groups of connection assemblies 300 are welded through the first connectors 210 to form a Z-shaped support frame structure; specifically, the hoisting assembly and the platform assembly can be connected to the draft tube access door 400 through bolt fasteners. The two groups of boom assemblies 100 are symmetrically installed on the left and right sides of the top of the draft tube access door 400; the platform assembly as a whole presents a Z-shaped support frame structure, and the pedal 200 of the platform assembly adopts a sunken structure, that is, the pedal 200 extends to the outside of the bottom of the draft tube access door 400 through the connection assembly 300, the purpose of which is to provide a more comfortable and larger working space for operators; the two groups of connection assemblies 300 are symmetrically installed on the left and right sides of the bottom of the draft tube access door 400;

[0034] The tailrace pipe maintenance device provided in this embodiment is configured with a modular hoisting component and a platform component. The boom component 100 of the hoisting component is composed of a base plate 110, a horizontal square steel 120, and an inclined square steel 130 to provide a triangular support frame structure for suspension support. The pedal 200 of the platform component and two sets of connecting components 300 form a Z-shaped support frame structure through a first connecting piece 210. The overall structure is simple and has strong load-bearing stability. In actual application, two sets of boom components 100 are symmetrically fixed on both sides of the tailrace pipe access door 400, and the base plate 110 of the boom component 100 is connected to the seat of the tailrace pipe access door 400 through a detachable fastener. The pedal 200 and two sets of connecting components 300 are assembled into a Z-shaped support frame through a first connecting piece 210, and the connecting components 300 are fixed inside the tailrace pipe access door 400 through a detachable fastener. The anti-falling device and the electric lifting device are respectively suspended on two sets of boom components 100. The operator enters the pedal 200 and connects the safety belt hook to the anti-falling device and the electric lifting device, and the interior of the tailrace pipe is maintained by lifting along the boom component 100 through the electric lifting device. The tailrace pipe maintenance device only needs to connect the hoisting component and the platform component to the tailrace pipe access door 400 through detachable fasteners to maintain the bottom of the tailrace pipe, solving the problems of the cumbersome operation process and long time consumption of the traditional temporary maintenance platform for tailrace pipe maintenance, improving the maintenance efficiency while reducing the high-altitude operation time of the operators. The triangular support frame structure and the Z-shaped support frame structure enhance the operation safety.

[0035] Preferably, please refer to Figure 2, in the triangular support frame structure of the boom assembly 100, the angle between the diagonal square steel 130 and the base plate 110 is an acute angle, and triangular reinforcement plates 140 are respectively provided at the joints between the base plate 110, the horizontal square steel 120, and the diagonal square steel 130; specifically, the angle between the diagonal square steel 130 and the base plate 110 is preferably 62°, the base plate 110 is preferably a rectangular steel plate. When the boom assembly 100 with a triangular support frame structure bears a vertical load, the stress distribution of the horizontal square steel 120 and the diagonal square steel 130 is balanced, which can effectively avoid overloading of a single component and improve safety; the triangular reinforcement plates 140 can be welded to the joints between the horizontal square steel 120 and the base plate 110, the joints between the diagonal square steel 130 and the base plate 110, and the joints between the diagonal square steel 130 and the horizontal square steel 120 by welding to enhance the torsion and shear resistance of the overall frame; in actual use, the overall welding and assembly of the boom assembly 100 can be completed in advance, and then the prefabricated boom assembly 100 can be fixed to the seat of the draft tube access gate 400 by bolts; in this embodiment, the triangular support frame of the boom assembly 100 forms a stable stress transmission path, significantly improving the overall stiffness and bearing capacity of the structure, effectively suppressing the deformation risk of the frame during lifting operations, enabling the boom assembly 100 to remain stable when bearing the weight of personnel, equipment, and dynamic loads, providing a safer suspension support foundation for operators, and at the same time simplifying the on-site installation and commissioning process.

[0036] Preferably, at least one first lifting ring 150 is provided at one end of the rhombic steel 130 away from the base plate 110, and at least one second lifting ring 160 is provided in the middle section of the horizontal square steel 120. The first lifting ring 150 is used to hang a fall prevention device or an electric lifting device, and the second lifting ring 160 is used to fix a safety belt hook. A handle 170 is further provided on the outer side of the rhombic steel 130. Specifically, at the bottom top end of the rhombic steel 130 away from the base plate 110, a circular steel bar made of the same material as the rhombic steel 130 is bent to form a closed-loop first lifting ring 150, ensuring that the axis of the first lifting ring 150 is consistent with the extension direction of the rhombic steel 130, so that the suspension hook of the fall prevention device or the electric lifting device is vertically stressed. The second lifting ring 160 is arranged on the same principle, and it is necessary to ensure that the force direction is perpendicular to the axis of the horizontal square steel 120 after the personnel wear the safety belt. The cross-sectional diameter of the handle 170 needs to meet the ergonomic design, and the surface of the handle 170 can be knurled to enhance the friction, facilitating the operators to enter the draft tube. In this embodiment, by setting functional lifting rings and a handle 170 on the rhombic steel 130 and the horizontal square steel 120, a composite function system integrating "safety protection, lifting operation, and personnel passage" is constructed. The separate areas of the first lifting ring 150 and the second lifting ring 160 realize the independent hanging and collaborative protection of the fall prevention device, the electric lifting device and the safety belt, can avoid the safety hazards of the traditional single hanging point, and combined with the triangular frame structure of the boom assembly 100, significantly improves the safety and convenience during the operation.

[0037] Preferably, please refer to Figure 3, in the Z-shaped support frame structure of the platform component, the two sets of connection components 300 are fixedly connected by a cross beam 220. The connection component 300 includes a second connection piece 310 and a third connection piece 320. The first connection piece 210 is used for bearing the weight of the pedal 200, and the top of the first connection piece 210 is fixedly connected to the second connection piece 310. One end of the third connection piece 320 is fixedly connected to the end of the second connection piece 310 away from the first connection piece 210. The third connection piece 320 extends to the side away from the pedal 200 and is fixedly connected to the draft tube inlet gate 400 through a reinforcing plate 330. A first diagonal reinforcing square steel 340 is further provided between the second connection piece 310 and the first connection piece 210. A second diagonal reinforcing square steel 350 is further provided between the bottom of the first diagonal reinforcing square steel 340 and the first connection piece 210. A handrail 360 is further provided on the surface of the first diagonal reinforcing square steel 340; wherein, the first connection piece 210, as the load-bearing structure of the whole pedal 200, can be welded to the periphery of the pedal 200 by using channel steel or square steel. The second connection piece 310 is vertically welded to the top surface of the first connection piece 210, and the top end of the second connection piece 310 is welded to the horizontally arranged third connection piece 320; the first diagonal reinforcing square steel 340 is obliquely welded between the second connection piece 310 and the first connection piece 210 to form a triangular support structure, enhancing the shear resistance of the connection node between the second connection piece 310 and the first connection piece 210; the second diagonal reinforcing square steel 350 extends from the bottom of the first diagonal reinforcing square steel 340 to the top of the first connection piece 210, and the second diagonal reinforcing square steel 350 and the first diagonal reinforcing square steel 340 form a double diagonal bracing structure, further strengthening the stability of the load-bearing node.

[0038] In this embodiment, the platform component adopts an overall Z-shaped support frame structure, and the installation operation is simple and convenient; according to Figure 3It can be understood that a handrail 360 is provided on the surface of the first diagonal reinforcing square steel 340. During the descent or ascent, the operator can adjust their body posture through the handrail 360 to ensure the safety of the operator during the lifting process. Through the multiple reinforcement design and function integration of the Z-shaped frame, the structural reliability and operation safety of the platform components are significantly improved. The Z-shaped sunken structure extends and fixes outward to the outside of the door through the third connecting piece 320, making the overall pedal 200 lower than the entrance of the draft tube access door 400, effectively expanding the vertical activity space of the operator and avoiding the space limitation of the traditional platform. The double support system formed by the first diagonal reinforcing square steel 340 and the second diagonal reinforcing square steel 350 disperses the load-bearing of the pedal 200 to the door structure through a triangular path, enhancing the anti-deformation ability of the frame and ensuring the stability during load-bearing. In addition, the modular design enables the platform components to be quickly disassembled and assembled to adapt to draft tube access doors 400 of different sizes, which not only simplifies the installation process but also achieves the dual optimization of space expansion and safety protection through structural reinforcement, providing a more efficient and safer operation platform for the inspection of the draft tube.

[0039] Preferably, a third eyebolt 321 for fixing a seatbelt hook is further provided at the top of the third connecting member 320. A plurality of triangular plates 322 are provided between the third connecting member 320 and the reinforcing plate 330. The reinforcing plate 330 is of a trapezoidal structure and is provided with a plurality of connection holes 331. A Z-shaped reinforcing plate 370 is further provided between the second connecting member 310, the third connecting member 320, and the first diagonal reinforcing square steel 340. The Z-shaped reinforcing plate 370 is fixedly connected to the second connecting member 310, the third connecting member 320, and the first diagonal reinforcing square steel 340 respectively. Specifically, the third eyebolt 321 is arranged at the center of the top of the third connecting member 320 and is also formed by bending a welded round steel. The axis of the third eyebolt 321 is perpendicular to the third connecting member 320 and is used to fix the seatbelt hook, forming a safety hanging point at the top of the platform assembly. In the connection area between the third connecting member 320 and the reinforcing plate 330, triangular plates 322 are arranged at intervals along the circumferential direction. The right-angle sides of the triangular plates 322 are welded to the bottom surface of the third connecting member 320 and the vertical surface of the reinforcing plate 330 respectively to enhance the connection stiffness between the third connecting member 320 and the reinforcing plate 330. The Z-shaped reinforcing plate 370 is formed by bending a steel plate. Its horizontal section is welded to the third connecting member 320, the vertical section is welded to the side surface of the second connecting member 310, and the inclined section is welded to the first diagonal reinforcing square steel 340, forming a three-dimensional reinforcing node to eliminate stress concentration at the frame connection. In this embodiment, through the addition of a safety hanging point and the design of a multi-dimensional strengthening structure, the safety protection system and structural reliability of the maintenance device are further improved. The setting of the third eyebolt 321 provides an independent safety anchor point at the top of the platform for the operators. Cooperating with other eyebolts in the boom assembly 100, double-up and down hanging protection can be formed to enhance safety redundancy. The combination of the triangular plates 322 and the trapezoidal reinforcing plate 330 enhances the connection strength between the third connecting member 320 and the draft tube access door 400, evenly distributes the anchoring force of the platform assembly, and inhibits the bending deformation of the horizontal square steel 120. The Z-shaped reinforcing plate 370 converts vertical loads, horizontal loads, and diagonal loads into in-plane internal forces of the plate members by covering the key nodes of the frame, significantly enhancing the torsional and buckling resistance of the overall frame. The modular platform assembly can be quickly installed without complex processes, achieving the dual goals of safety protection upgrade and structural performance enhancement, providing a more stable and comprehensive safety guarantee for the draft tube maintenance operation.

[0040] Preferably, the surface of the pedal 200 is provided with anti-slip patterns. In this embodiment, by providing anti-slip patterns on the surface of the pedal 200, the standing and walking safety of the operators on the platform is improved, which is suitable for the wet and dust-prone working environment inside the draft tube.

[0041] Please refer to Figure 4 , which shows a method flowchart of a method for maintaining a draft tube of a hydropower station provided by an embodiment of the present invention. The method includes:

[0042] Step S100: Symmetrically fix two groups of boom assemblies 100 on both sides of the draft tube inlet gate 400, and connect the base plate 110 of the boom assembly 100 to the draft tube inlet gate 400 through detachable fasteners; specifically, arrange the two groups of boom assemblies 100 symmetrically on both sides of the draft tube inlet gate 400. The triangular support frame of the boom assembly 100 is composed of a base plate 110, a horizontal square steel 120, and an inclined square steel 130 welded together. The inclined square steel 130 forms a 62° angle with the base plate 110; use high-strength bolts to fasten the base plate 110 of the boom assembly 100 to the reserved threaded holes of the draft tube inlet gate 400 to ensure the stability of the triangular frame; weld a second lifting ring 160 in the middle section of the horizontal square steel 120 as a fixed point for the safety belt hook, weld a first lifting ring 150 at the end of the inclined square steel 130 for hanging the electric lifting device and the anti-falling device, and install an auxiliary handle 170 on the outside of the inclined square steel 130.

[0043] Step S200: Assemble the pedal 200 and two groups of connecting components 300 into a Z-shaped support frame through a first connecting piece 210, and fix the connecting components 300 inside the draft tube inlet gate 400 through detachable fasteners; specifically, fix the pedal 200 and two groups of connecting components 300 through a first connecting piece 210. The connecting component 300 includes a second connecting piece 310 and a third connecting piece 320. A Z-shaped frame is formed by connecting the second connecting piece 310 and the pedal 200 through a first inclined reinforcing square steel 340; fix the third connecting piece 320 of the connecting component 300 to the seat of the draft tube inlet gate 400 through bolts, and add a trapezoidal reinforcing plate 330 at the connection to disperse the load; at the same time, set anti-slip patterns on the surface of the pedal 200;

[0044] Step S300: Hang the anti-falling device and the electric lifting device on two groups of boom assemblies 100 respectively; specifically, hang the traction cable of the electric lifting device and the safety rope of the anti-falling device on the first lifting rings 150 at the ends of the inclined square steels 130 of two groups of boom assemblies 100 respectively; check the braking system of the electric lifting device and the triggering mechanism of the anti-falling device to ensure that they are in normal working conditions;

[0045] Step S400: The operator enters the pedal 200 and connects with the anti-falling device and the electric lifting device by using a safety belt hook, and performs maintenance on the inside of the draft tube by lifting along the boom assembly 100 through the electric lifting device; specifically, the operator wears a full-body safety belt, stands on the pedal 200, and hooks the double hooks of the safety belt to the corresponding hanging points; the external operator controls the electric lifting device to drive the operator to vertically lift along the boom assembly 100; after the operator checks or repairs the inside of the draft tube, the welds or the equipment, the operator returns to the pedal 200 smoothly through the electric lifting device;

[0046] The overhaul method of the draft tube of the hydropower station provided in this embodiment completely changes the inefficient mode that traditional draft tube overhaul relies on temporary platforms through the rapid installation and collaborative operation of the modular boom assembly 100 and the Z-shaped platform assembly, realizing the high efficiency and safety of the internal overhaul of the draft tube; the triangular support frame of the boom and the Z-shaped structure of the platform ensure the load-bearing stability, and the detachable fastening design greatly simplifies the installation process; the double protection mechanism of the anti-falling device and the electric lifting device effectively reduces the risk of high-altitude falling, and the design of the anti-slip pedal 200, multiple handrails, and multiple lifting rings further ensures the operation safety of the operators. This method does not require the erection of a traditional overhaul platform, significantly shortens the operation time, is applicable to the complex and narrow draft tube environment, and takes into account both efficiency improvement and safety guarantee.

[0047] Preferably, the method further includes:

[0048] During the lifting process of the operators, the vibration data of the boom assembly 100 and the platform assembly are collected in real time through the vibration sensors installed on the boom assembly 100 and the platform assembly; specifically, corrosion-resistant vibration sensors, such as MEMS accelerometers, can be installed at the joints of the horizontal square steel 120 and the inclined square steel 130 of the boom assembly 100, the second connecting member 310 and the third connecting member 320 of the platform assembly, etc.; the sensors are connected to the embedded control unit through shielded cables or wireless transmission modules to collect vibration acceleration signals in real time;

[0049] Based on the spectral analysis results of vibration data, judge the resonance frequency offset of the boom assembly 100 and the platform assembly; if the resonance frequency offset exceeds the preset threshold, automatically trigger the emergency brake of the electric lifting device and send an alarm signal; specifically, the embedded control unit preprocesses the vibration signal, such as filtering and denoising, and generates a spectrogram through fast Fourier transform (FFT); compares the real-time spectrum with the pre-stored natural frequency benchmarks of the boom and the platform, calculates the resonance frequency offset, and preferably the frequency deviation percentage; if the offset exceeds the preset safety threshold, it is determined as a resonance risk; after determining the risk, the control unit sends a pulse signal to the brake of the electric lifting device, triggers the electromagnetic brake to lock the lifting cable, and stops the movement of the operator; simultaneously sends an alarm message to the monitoring terminal through the LoRa wireless module, and the alarm message includes but is not limited to the risk location and the frequency offset, and activates the audible and visual alarm to prompt the on-site personnel; as a preferred technical solution, a tactile feedback module, such as a vibration motor, can also be installed at the bottom of the pedal 200 of the platform assembly. When a resonance risk is detected, the operator is reminded to adjust the posture through vibration; this embodiment realizes the active safety protection of the draft tube maintenance operation through the integration of vibration sensing and intelligent control. The vibration sensor monitors the structural dynamic characteristics in real time, and the spectral analysis accurately identifies the resonance risk; automatically triggers the emergency brake and the multi-level alarm mechanism, significantly reducing the probability of accidents caused by structural vibration. In addition, this method can realize the full-process automatic early warning without manual intervention, making up for the lag of traditional manual inspection in identifying dynamic risks, transforming safety management from post-disposal to pre-prevention, further improving the intelligent safety protection system for draft tube maintenance, providing a more reliable technical guarantee for operations in high-risk environments, and is especially suitable for the draft tube environment under high water flow impact or complex load conditions.

[0050] It should be noted that the above sequence of embodiments of the present invention is only for description and does not represent the advantages and disadvantages of the embodiments. The processes depicted in the drawings do not necessarily require the specific order or continuous order shown to achieve the desired results. In some embodiments, multitasking and parallel processing are also possible or may be advantageous.

[0051] Each embodiment in this specification is described in a progressive manner. The same or similar parts among the embodiments can be referred to each other, and each embodiment focuses on the differences from other embodiments.

Claims

1. A maintenance device for the draft tube of a hydropower station, characterized in that, It includes a hoisting component and a platform component, and the hoisting component and the platform component are respectively connected to the inlet gate of the draft tube through detachable fasteners; The hoisting component includes two groups of boom components symmetrically arranged on the inlet gate of the draft tube. The boom component includes a base plate, a horizontal square steel and an inclined square steel, and the base plate, the horizontal square steel and the inclined square steel form a triangular support frame structure for providing suspension support; The platform component includes a pedal and two groups of connecting components symmetrically arranged on the top of the pedal. First connectors are respectively arranged around the pedal, and the pedal and the two groups of connecting components form a Z-shaped support frame structure through the first connectors.

2. The overhaul device for the draft tube of a hydropower station according to claim 1, characterized in that, In the triangular support frame structure of the boom component, the included angle between the inclined square steel and the base plate is an acute angle, and triangular reinforcement plates are respectively arranged at the joints between the base plate, the horizontal square steel and the inclined square steel.

3. The overhaul device for the draft tube of a hydropower station according to claim 2, wherein At least one first lifting ring is arranged at one end of the inclined square steel away from the base plate, and at least one second lifting ring is arranged in the middle section of the horizontal square steel. The first lifting ring is used for hanging a fall prevention device or an electric lifting device, the second lifting ring is used for fixing a safety belt hook, and a handle is also arranged on the outer side of the inclined square steel.

4. The overhaul device for the draft tube of a hydropower station according to claim 1, characterized in that, In the Z-shaped support frame structure of the platform component, the two groups of connecting components are fixedly connected through a cross beam. The connecting component includes a second connector and a third connector. The first connector is used for bearing the weight of the pedal, and the top of the first connector is fixedly connected to the second connector. One end of the third connector is fixedly connected to the end of the second connector away from the first connector, and the third connector extends away from the pedal and is fixedly connected to the inlet gate of the draft tube through a reinforcing plate.

5. The overhaul device for the draft tube of a hydropower station according to claim 4, characterized in that, A first diagonal reinforcing square steel is also arranged between the second connector and the first connector, a second diagonal reinforcing square steel is also arranged between the bottom of the first diagonal reinforcing square steel and the first connector, and a handrail is also arranged on the surface of the first diagonal reinforcing square steel.

6. The overhaul device for the draft tube of a hydropower station according to claim 4, wherein, A third lifting ring for fixing a safety belt hook is also arranged on the top of the third connector, and a plurality of triangular plates are arranged between the third connector and the reinforcing plate. The reinforcing plate is of a trapezoidal structure and a plurality of connection holes are arranged on the reinforcing plate.

7. The overhaul device for the draft tube of a hydropower station according to claim 5, characterized in that A Z-shaped reinforcing plate is also arranged between the second connector, the third connector and the first diagonal reinforcing square steel, and the Z-shaped reinforcing plate is fixedly connected to the second connector, the third connector and the first diagonal reinforcing square steel respectively.

8. The overhaul device for the draft tube of a hydropower station according to any one of claims 1 to 7, characterized in that, The surface of the pedal is provided with anti-slip patterns.

9. A maintenance method for the draft tube of a hydropower station, characterized in that, It includes the hydroelectric power station draft tube maintenance device according to any one of claims 1 to 8, and the method includes: Symmetrically fix two groups of boom components on both sides of the inlet gate of the draft tube, and connect the base plate of the boom component to the inlet gate of the draft tube through detachable fasteners; Assemble the pedal and two groups of connecting components into a Z-shaped support frame through the first connectors, and fix the connecting components inside the inlet gate of the draft tube through detachable fasteners; Suspend the fall prevention device and the electric lifting device on the two groups of boom components respectively; The operator enters the pedal and connects the safety belt hook to the fall prevention device and the electric lifting device, and performs maintenance on the inside of the draft tube by ascending and descending along the boom component through the electric lifting device.

10. The overhaul method of the draft tube of a hydropower station according to claim 9, characterized in that, The method further includes: during the lifting and lowering of the operator, vibration data of the boom assembly and the platform assembly are collected in real time by vibration sensors installed on the boom assembly and the platform assembly; Based on the spectral analysis result of the vibration data, the resonance frequency offset of the boom assembly and the platform assembly is judged; if the resonance frequency offset exceeds a preset threshold, the emergency braking of the electric lifting device is automatically triggered and an alarm signal is sent.

Images