Hydro-generator unit overhauling device

Abstract

The present application relates to the field of hydroelectric generator, especially to a kind of hydroelectric generator unit overhauling device.The technical problem: the impurities attached on stator affect paint brushing, and artificial cleaning efficiency is low.The technical scheme: a kind of hydroelectric generator unit overhauling device, including support frame and telescopic rotary frame;Support frame is equipped with motor, electric roller, softening unit and scraping unit etc.;Support frame motor rotating shaft is fixedly connected with several telescopic rotary frames;Telescopic rotary frame telescopic part is equipped with electric roller;Electric roller is equipped with several annular staggered softening units and scraping units.The present application is pushed by the expansion soft container to the stator inside, and the impurities in the middle part of stator are separated, and the separated impurities float in the stator by the blowing of air flow, and the floating impurities are adhered by the adhesive material on the surface of soft container, to avoid the impurities reattach to the stator.

Description

Technical Field

[0001] This invention relates to the field of hydro-generators, and more particularly to a hydro-generator set maintenance device. Background Technology

[0002] After a certain period of use, the hydro-generator needs to be maintained and repaired to ensure that it can operate stably for an extended period of time.

[0003] Because the stator of the hydro generator needs to be repainted during maintenance and repair, and the stator has impurities accumulated over a long period of use, these impurities need to be cleaned off before repainting to avoid affecting the painting effect. In addition, the upper and lower layers of the stator are inclined, while the middle part is vertical.

[0004] When maintaining and repairing the stator of a hydro generator, there are usually two methods. One is to disassemble the stator for maintenance and repair. Because the stator is large, it needs to be hoisted after disassembly, which can easily lead to safety accidents. The other is to maintain and repair the stator manually without disassembly. However, manual cleaning is inefficient and the cleaning effect is not good. Summary of the Invention

[0005] To overcome the shortcomings of impurities adhering to the stator affecting painting and low efficiency of manual cleaning, this invention provides a maintenance device for hydro-generator sets.

[0006] Technical solution: A maintenance device for a hydro-generator set includes a support frame and a telescopic rotating frame; a motor is mounted on the support frame; several telescopic rotating frames are fixedly connected to the motor's rotating shaft on the support frame; it also includes an electric roller, a softening unit, and a scraping unit; the telescopic part of the telescopic rotating frame is equipped with an electric roller; several softening units and scraping units arranged in a ring are mounted on the electric roller; the softening unit consists of a toughening column and a water bladder; a toughening column for conveying cleaning agent is fixedly connected to the electric roller, all toughening columns have water holes, all toughening columns are connected to a water pipe, and the water pipe is located at the center of the electric roller; the toughening column is connected to a water bladder, and the water bladder is equipped with a self-sealing strip.

[0007] Furthermore, the scraping unit includes a collection rack and a filter screen; the collection rack, made of a tough material, is fixed to the electric roller; and a filter screen for collecting dirt is fixed to the collection rack.

[0008] Furthermore, it also includes a cleaning rod; a cleaning rod is fixed inside each filter screen, the cleaning rod can be deformed, and each cleaning rod is provided with several deformable circular rods arranged in a ring array.

[0009] Furthermore, all the filters are tilted, and the gaps between the filters and the stator are staggered.

[0010] Furthermore, it also includes a self-cleaning component; each telescopic rotating frame is equipped with a self-cleaning component, the number of which is the same as the number of scraping units, and all self-cleaning components cooperate with their corresponding scraping units; the self-cleaning component includes a fixed frame, flexible strips, and magnetic strips; a fixed frame is fixedly connected to the telescopic part of the telescopic rotating frame; several flexible strips are fixedly connected inside the fixed frame; several magnetic strips are set at the bottom of the filter screen, all of which are fixedly connected to the collection frame, and all the magnetic strips attract each other, allowing the filter screen to be opened from the bottom.

[0011] Furthermore, it also includes a collection component; the collection component is installed at the bottom of the support frame; the collection component includes an electric rotating ring I, a placement frame, a pull plate, and a collection container; the electric rotating ring I is installed at the bottom of the support frame; several placement frames are fixedly connected to the bottom of the support frame, and all placement frames are in contact with the electric rotating ring I; several pull plates are fixedly connected to the rotating part of the electric rotating ring I; each placement frame has a collection container for collecting the cleaned dirt installed inside, the collection containers are foldable, and all collection containers are connected to the corresponding pull plate.

[0012] Furthermore, it also includes a blowing cleaning assembly; another telescopic rotating frame is fixedly connected to the rotating shaft of the support frame motor, the other telescopic rotating frame is located between the other telescopic rotating frames, and the other telescopic rotating frame is staggered with the other telescopic rotating frames; a blowing cleaning assembly is installed on the telescopic part of the other telescopic rotating frame; the blowing cleaning assembly includes a mounting column, an electric rotating ring II, cleaning strips and a soft container; the mounting column is installed on the telescopic part of the other telescopic rotating frame; the electric rotating ring II is installed on the mounting column; several cleaning strips arranged in a ring array for insertion into the stator are fixedly connected to the electric rotating ring II, all cleaning strips are made of tough material, all cleaning strips have through holes, and all cleaning strips have partitions inside, the partitions dividing the cleaning strip into two channels.

[0013] Furthermore, the blowing cleaning assembly also includes a soft container; a soft container is installed on the upper and lower sides of each cleaning strip, and all the soft containers are connected to the corresponding cleaning strip.

[0014] Furthermore, it also includes a support assembly; the support assembly is installed at the bottom of the support frame and is located below the collection assembly; the support assembly includes a mounting ring, an electric rotating column, and an electrically controlled expansion component; a level detector is installed inside the support frame; the mounting ring is fixedly connected to the bottom of the support frame; several electric rotating columns are connected to the mounting ring; and each of the electric rotating columns is equipped with an electrically controlled expansion component.

[0015] Furthermore, all the electric rotating columns are connected to the adjacent pull plates by thin ropes, which are slidably connected to the electric rotating columns. There are two nodes at the slidable connection between the thin ropes and the electric rotating columns.

[0016] The beneficial effects are as follows: This invention sprays the cleaning agent inside the water bladder into the stator. After the cleaning agent adheres to the stator, the impurities on the stator begin to soften. The impurities washed down are intercepted by the filter screen. The water passes through the filter screen and flows downward. The impurities are trapped inside the filter screen and are prevented from being transferred to the cleaned area inside the stator, thus avoiding affecting the cleaning effect of the stator.

[0017] This invention uses a deformable collection frame to compress the filter screen against the round rod on the unblocking rod, causing the round rod to clear the gaps in the filter screen and push down the impurities trapped by the filter screen, thus avoiding affecting the filter screen's ability to intercept impurities.

[0018] This invention provides a magnetic strip at the bottom of the filter screen, allowing the filter screen to be opened from the bottom. The magnetic strip is separated by a flexible strip, allowing the bottom of the filter screen containing impurities to open and fall into the collection assembly and then into the collection container. This prevents impurities from remaining in the filter screen and affecting the subsequent cleaning effect on the stator.

[0019] This invention uses an expanded soft container to push the interior of the stator, detaching impurities from the middle part of the stator. The detached impurities float inside the stator with the airflow, and the adhesive substance on the surface of the soft container adheres to the floating impurities, preventing them from re-attaching to the stator.

[0020] This invention uses expanded soft containers that fit together to form a barrier, which blocks the water sprayed from the two cleaning strips, preventing the impurities washed down from being transferred to the surrounding cleaned areas.

[0021] This invention adjusts the tilt of the invention by controlling the expansion or contraction of the electronically controlled expansion component. In conjunction with a leveling instrument, the invention is adjusted to a straight state, avoiding the need for cleaning the stator and allowing the invention to be placed stably in hydro-generators of different specifications. Attached Figure Description

[0022] Figure 1 This is a schematic diagram of the first overall structure of the hydro-generator unit maintenance device disclosed in this invention; Figure 2 This is a schematic diagram of the second overall structure of the hydro-generator maintenance device of the present invention; Figure 3 This is a schematic diagram of the combined structure of the electric roller, water bladder and collection rack disclosed in the hydro-generator set maintenance device of the present invention. Figure 4 This is a cross-sectional view of the combined structure of the electric roller, the flexible column, the water bladder, the fixed frame and the flexible strip disclosed in the present invention for the maintenance device of the hydro-generator set. Figure 5This is a schematic diagram of the combined structure of the collection rack, filter screen, unblocking rod and magnetic strip disclosed in the hydro-generator set maintenance device of the present invention; Figure 6 This is a schematic diagram of the blowing cleaning assembly disclosed in the hydro-generator set maintenance device of the present invention; Figure 7 This is a schematic diagram of the automatic drainage control system for the tailrace disc valve of the hydro-generator unit according to the present invention; Figure 8 This is a schematic diagram of the automatic control principle for drainage of the tailrace disc valve of the hydro-generator unit according to the present invention.

[0023] In the attached diagrams: 1-Support frame, 2-Telescopic rotating frame, 3-Electric roller, 4-Tough column, 5-Water bladder, 6-Collection rack, 7-Filter screen, 8-Unblocking rod, 101-Fixed frame, 102-Tough strip, 103-Magnetic strip, 110-Electric rotating ring I, 111-Placement frame, 112-Pull plate, 113-Collection container, 201-Mounting column, 202-Electric rotating ring II, 203-Cleaning strip, 204-Soft container, 301-Mounting ring, 302-Electric rotating column, 303-Electrically controlled expansion component, 5a-Self-sealing strip, 203a-Through hole. Detailed Implementation

[0024] The present invention will now be described in detail with reference to the accompanying drawings. Example

[0025] A maintenance device for a hydro-generator set, such as Figure 1-5 As shown, it includes a support frame 1 and a telescopic rotating frame 2; a motor is provided on the support frame 1; at least two telescopic rotating frames 2 are fixedly connected to the motor rotating shaft of the support frame 1. It also includes an electric roller 3, a softening unit, and a scraping unit; the telescopic part of the telescopic rotating frame 2 is equipped with an electric roller 3; several softening units and scraping units are installed on the electric roller 3 in an interlocking ring; the softening unit consists of a toughening column 4 and a water bladder 5; the toughening column 4 is fixedly connected to the electric roller 3, all the toughening columns 4 have water holes, all the toughening columns 4 are connected to a water pipe, and the water pipe is located at the center of the electric roller 3; the toughening column 4 is connected to the water bladder 5, and the water bladder 5 is provided with a self-sealing strip 5a.

[0026] The scraping unit includes a collection frame 6 and a filter screen 7; the collection frame 6 is fixedly attached to the electric roller 3, and the collection frame 6 is made of a tough material; the filter screen 7 is fixedly attached to the collection frame 6.

[0027] It also includes a cleaning rod 8; a cleaning rod 8 is fixed inside each of the filter screens 7. The cleaning rod 8 is deformable, and each of the cleaning rods 8 is provided with several deformable circular rods arranged in a ring array.

[0028] All filters 7 are offset and tilted relative to the stator gap, which increases the collection range of the filters 7 for impurities inside the stator and improves the collection effect of impurities.

[0029] Before maintaining and repairing the stator of the hydro-generator, this invention is placed inside the lower frame of the hydro-generator. An external cleaning agent conveyor is connected to the electric roller 3 via a water pipe. The external cleaning agent conveyor is then controlled to deliver the cleaning agent into the electric roller 3. The cleaning agent in the electric roller 3 is then transferred to the toughening column 4, and then to the water bladder 5. Simultaneously, the telescopic rotating frame 2 is pushed out, driving the softening unit and scraping unit towards the stator. When the electric roller 3 is about to contact the stator, the telescopic rotating frame 2 stops pushing out and begins to rotate, tilting the softening unit and scraping unit forward at a specified angle, making them flush with the upper and lower layers of the stator. Okay, then twist the softening unit and scraping unit to make them perpendicular to the upper and lower layers of the stator. Then continue to control the telescopic rotating frame 2 to push the softening unit and scraping unit towards the stator. At this time, the softening unit and scraping unit insert into the gap of the stator and begin to clean the upper and lower layers of the stator. Start the motor in the support frame 1 to drive the softening unit and scraping unit to rotate slowly. At the same time, start the electric roller 3 to drive the softening unit and scraping unit to start rotating slowly. Some of the softening unit and scraping unit begin to insert into the gap of the upper and lower layers of the stator. The water bag 5 and the collection frame 6 are squeezed and begin to deform. The self-sealing strip 5a begins to bear force. When the water bag 5 After most of the material is inserted into the gaps between the upper and lower layers of the stator, the self-sealing strip 5a reaches its limit of force, opening and releasing the cleaning agent from the water bladder 5 into the stator. The cleaning agent adheres to the stator, softening the impurities. At this point, the stator is manually rinsed with a water gun to wash away the softened impurities. The corresponding collection rack 6 and filter screen 7 are located inside the stator, intercepting the washed-down impurities through the filter screen 7. Water flows downwards through the filter screen 7, trapping the impurities within it, preventing them from transferring to the cleaned areas inside the stator and affecting the cleaning effect. Simultaneously, the filter screen 7 is offset and tilted relative to the stator gaps, ensuring proper cleaning of the stator. The collection range of impurities inside the filter screen 7 is increased, and the collection effect of impurities is improved. As the impurities inside the filter screen 7 increase, the filter screen 7 will be blocked by impurities, preventing water from passing through the filter screen 7 and transferring downwards. This causes water to accumulate inside the filter screen 7, causing water and impurities to overflow outwards. When the electric roller 3 drives the water bladder 5, which was originally located inside the stator, to be gradually pulled out of the stator, the self-sealing strip 5a closes, and the cleaning agent in the water bladder 5 begins to be replenished. At the same time, the water bladder 5 and the collection rack 6 are squeezed again. The deformed collection rack 6 drives the filter screen 7 to squeeze the round rod on the unblocking rod 8, so that the round rod on the unblocking rod 8 unblocks the gaps in the filter screen 7, pushing down the impurities trapped by the filter screen 7, so as to avoid affecting the filter screen 7's interception effect on impurities.

[0030] It should be noted that when the round rod on the unblocking rod 8 clears the gap in the filter screen 7, the round rod on the unblocking rod 8 first pushes the gap in the filter screen 7. At this time, the round rod on the unblocking rod 8 does not penetrate the filter screen 7. The round rod on the unblocking rod 8 deforms, and the impurities still remain on the filter screen 7, but the impurities have been loosened. As the electric roller 3 continues to rotate, the round rod on the unblocking rod 8 and the filter screen 7 are pulled out of the stator. The round rod on the unblocking rod 8 and the filter screen 7 gradually lose contact. When the round rod on the unblocking rod 8 loses contact with the filter screen 7, the round rod on the unblocking rod 8 returns to its initial state. During the process of the round rod on the unblocking rod 8 returning to its initial state, it knocks on the filter screen 7, causing the loose impurities on the filter screen 7 to fall off. At this time, the filter screen 7 is located outside the stator, and the filter screen 7 and the electric roller 3 are misaligned. The impurities will fall directly downwards into the subsequent collection device and will not be transferred back into the stator. Example

[0031] Based on Example 1, such as Figure 1-2 As shown, it also includes a self-cleaning component; each telescopic rotating frame 2 is equipped with a self-cleaning component, the number of self-cleaning components is the same as the number of scraping units, and all self-cleaning components cooperate with the corresponding scraping units; the self-cleaning component includes a fixed frame 101, a flexible strip 102 and a magnetic strip 103; a fixed frame 101 is fixedly connected to the telescopic part of the telescopic rotating frame 2; several flexible strips 102 are fixedly connected inside the fixed frame 101 and are distributed vertically and horizontally at equal intervals; two magnetic strips 103 are provided at the bottom of the filter screen 7, all magnetic strips 103 are fixedly connected to the collection frame 6, and all magnetic strips 103 attract each other, so that the filter screen 7 can be opened from the bottom.

[0032] It also includes a collection component; the collection component is installed at the bottom of the support frame 1; the collection component includes an electric rotating ring I 110, a placement frame 111, a pull plate 112, and a collection container 113; the electric rotating ring I 110 is installed at the bottom of the support frame 1; six placement frames 111 are fixedly connected to the bottom of the support frame 1, and all placement frames 111 are in contact with the electric rotating ring I 110; six pull plates 112 are fixedly connected to the rotating part of the electric rotating ring I 110; each placement frame 111 has a collection container 113 installed inside it, the collection container 113 can be folded, and all collection containers 113 are connected to the corresponding pull plate 112.

[0033] Before using this invention, start the electric rotating ring I110 and rotate it clockwise at a top-down angle. The pull plate 112 and the collection container 113 rotate accordingly. During the rotation, the collection container 113 gradually expands, changing the state of the collection assembly as shown. Figure 2 As shown in the expanded state, the state transition is completed when the pull plate 112 is attached to the placement frame 111.

[0034] When the filter screen 7 containing impurities is pulled out of the stator, as the motor of the support frame 1 rotates, the filter screen 7 containing impurities moves towards the self-cleaning component. It is necessary to clean and transfer the impurities in the filter screen 7, which would affect the subsequent collection effect of the collection rack 6 and the filter screen 7 on the stator. When the magnetic strip 103 fixed to the collection rack 6 comes into contact with the flexible strip 102 on the fixed frame 101, the collection rack 6 is squeezed. After the flexible strip 102 is pressed into the bottom of the collection rack 6, it is pulled by the flexible strip 102, and the bottom of the collection rack 6 deforms. The magnetic strips 103 that are attracted together separate, so that the bottom of the filter screen 7 containing impurities opens, and the impurities fall into the collection component and into the collection container 113. This prevents the impurities from staying in the filter screen 7 and affecting the subsequent cleaning effect on the stator. The impurities that fall into the collection container 113 are transferred manually after the stator is cleaned. Example

[0035] Based on Example 2, such as Figure 1-6 As shown, it also includes a blowing cleaning assembly; another telescopic rotating frame 2 is fixedly connected to the motor rotating shaft of the support frame 1, the other telescopic rotating frame 2 is located between the other telescopic rotating frames 2, and the other telescopic rotating frame 2 is staggered with the other telescopic rotating frames 2; a blowing cleaning assembly is installed on the telescopic part of the other telescopic rotating frame 2; the blowing cleaning assembly includes a mounting post 201, an electric rotating ring II 202, cleaning strips 203 and a soft container 204; the mounting post 201 is installed on the telescopic part of the other telescopic rotating frame 2; an electric rotating ring II 202 is installed on the mounting post 201; several cleaning strips 203 arranged in a ring array are fixedly connected to the electric rotating ring II 202, all cleaning strips 203 are made of tough material, all cleaning strips 203 have through holes 203a, and all cleaning strips 203 have partitions inside, the partitions dividing the cleaning strips 203 into two channels.

[0036] The blowing cleaning assembly also includes a soft container 204; a soft container 204 is installed on the upper and lower sides of each cleaning strip 203, and all the soft containers 204 are connected to the corresponding cleaning strip 203.

[0037] All the soft containers 204 have a layer of adhesive material on their surface. The adhesive material on the surface of the soft containers 204 is used to adhere floating impurities and prevent them from re-adhering to the stator.

[0038] All cleaning strips 203 are designed with sharp corners to facilitate insertion of the cleaning strips 203 into the stator.

[0039] It also includes a support assembly; the support assembly is installed at the bottom of the support frame 1 and is located below the collection assembly; the support assembly includes a mounting ring 301, an electric rotating column 302 and an electrically controlled expansion component 303; a level detector is provided inside the support frame 1; the mounting ring 301 is fixedly connected to the bottom of the support frame 1; six electric rotating columns 302 arranged in a ring are connected to the mounting ring 301; each of the electric rotating columns 302 is equipped with an electrically controlled expansion component 303.

[0040] All the electric rotating columns 302 are connected to the adjacent pull plates 112 by thin ropes. The thin ropes are slidably connected to the electric rotating columns 302. There are two nodes at the slidable connection between the thin ropes and the electric rotating columns 302. When the thin ropes are pulled to move to the corresponding nodes, it is determined whether there is a stable position inside the water turbine generator.

[0041] Before using this invention, connect the mounting column 201 to an external water source and supply water to the mounting column 201.

[0042] As the motor inside the support frame 1 drives the cleaning assembly to rotate slowly, the blowing cleaning assembly on another telescopic rotating frame 2 rotates accordingly. Simultaneously, the other telescopic rotating frame 2 extends, and the blowing cleaning assembly moves towards the stator. When the cleaning strip 203 inserts into the middle part of the stator, it cleans the middle part, scraping off impurities. The scraped impurities fall downwards. At the same time, the electric rotating ring II 202 is activated, driving the cleaning strip 203 to rotate clockwise at a top-down angle. When the cleaning strip 203 inserts into the stator, it experiences friction. As the cleaning strip 203 is inserted deeper into the stator, the friction between the cleaning strip 203 and the stator increases. When the friction reaches a certain level, the cleaning strip 203 connects with the mounting post 201, and water transfers from the mounting post 201 to the cleaning strip 203. Then, water is ejected from the through-hole 203a on the cleaning strip 203 inserted into the stator, flushing the interior of the stator and removing impurities. However, the amount of water ejected from the through-hole 203a is not proportional to the amount transferred to the cleaning strip 203; more water is transferred to the cleaning strip 203 than is ejected from the through-hole 203a. Therefore... The water transferred to the cleaning strip 203 is transferred to the flexible container 204, which then expands. This expansion pushes against the interior of the stator, causing impurities to detach. These impurities are then washed away by the water and dispersed within the stator. The adhesive substance on the surface of the flexible container 204 adheres to the floating impurities, preventing them from re-attaching. As the cleaning strip 203 is pulled out from the middle of the stator, the flexible container 204 is compressed, and the water inside is discharged through the through-hole 203a of the cleaning strip 203 into the collection container. Inside container 113, the impurities remaining on the soft container 204 are subsequently cleaned manually. When the two cleaning strips 203 are inserted into the stator at the same time, both cleaning strips 203 are connected to the mounting column 201. Water is sprayed from the channels on opposite sides of the two cleaning strips 203 to clean the inside of the stator. At this time, the soft containers 204 that expand on the lower side of the two cleaning strips 203 stick together to form a barrier. The barrier formed by the soft containers 204 blocks the water sprayed from the two cleaning strips 203, preventing the impurities washed down from being transferred to the surrounding cleaned area.

[0043] It should be noted that the gaps in the middle part of the stator are arranged relatively tightly. The cleaning strips 203 on the electric rotating ring II 202 are arranged in the same way as the gaps in the middle part of the stator. When the cleaning strips 203 on the electric rotating ring II 202 are inserted into the gaps in the middle part of the stator, from a top-down view, two cleaning strips 203 are inserted into the stator at the same time, forming a V shape.

[0044] Considering that during maintenance and repair of the hydro-generator without disassembly, the cleaning equipment is used in situations where the hydro-generator has a frame or not, the present invention can be placed normally on the frame when there is one. However, when there is no frame, the hydro-generator cannot provide a flat surface, making it impossible to place the cleaning equipment flat, which affects the maintenance and repair of the hydro-generator. During the process of the collection component changing from the state to the expansion state, the pull plate 112 pulls the electric rotating column 302 through the thin rope. The thin rope slides on the electric rotating column 302. When the thin rope moves to the first node and can no longer be pulled, the electric rotating column 302 is restricted by the inside of the hydro-generator. If the device cannot be flipped downwards, and the thin rope can continue to be pulled after moving to the first node, it indicates that there is no flat area inside the hydro-generator. At this time, the electric rotating column 302 is activated to flip downwards. When the electrically controlled expansion member 303 on the electric rotating column 302 comes into contact with the inside of the hydro-generator, the electrically controlled expansion member 303 is squeezed. At this time, the device is in an inclined state, and the stator cannot be effectively cleaned. The degree of inclination of the device is determined by the level detector in the support frame 1. The inclination of the device is adjusted by controlling the expansion or contraction of the electrically controlled expansion member 303. The device is adjusted to a straight state in conjunction with the level detector to avoid cleaning the stator. Example

[0045] Examples 1-3 introduce the apparatus and method for overhauling hydro-generator units, effectively improving the maintenance efficiency of hydro-generator stators. However, as hydropower is a clean and renewable energy source, it is receiving increasing attention and widespread application. Besides the problem of low maintenance efficiency, the drainage process of the tailrace disc valve in hydro-generator units also presents many problems, such as the reliance on manual control and difficulty in operation. During unit maintenance and drainage, the operation of the disc valve and oil pump, as well as the control of the water level in the sump, heavily rely on human resources, making it impossible to achieve automated control functions such as real-time monitoring and automatic adjustment. (1) After the tailrace disc valve is opened, the water in the turbine casing and tailrace pipe flows by gravity to the maintenance collection well, and then the water is pumped to the downstream river outside the plant by the drainage pump.

[0046] (2) In large or giant hydro-generator units, the spiral casing disc valve and tailrace disc valve are located on the upstream and downstream sides of the operating corridor layer, respectively. During operation, the transfer oil pump generally requires 3-4 operators.

[0047] (3) The opening degree of the tailrace disc valve directly determines the inflow rate of the sump (or the rate of rise of the sump water level). To prevent the inflow rate of the sump from exceeding the pumping capacity of the drainage pump and causing flooding of the plant, operators must constantly monitor the water level through the control cabinet in the drainage pump room to determine the opening degree of the disc valve. Since the pump room and the disc valve are located at different installation elevations in the plant, 1-2 operators need to be separately assigned to the control cabinet side of the pump room.

[0048] (4) Large units have long flow channels and large diameters, and the drainage time is relatively long (generally 5-7.5 hours / unit). They are usually arranged to be carried out at night, which is labor-intensive and the workers' attention is easily distracted.

[0049] In addition, due to the dispersed work locations, communication between workers and the transmission of operating instructions are inconvenient, which poses safety risks such as operation delays and misoperations.

[0050] To address existing problems, this embodiment introduces the automatic drainage control of the tailrace disc valve of a hydro-generator unit. This control method is based on the MODBUS_TCP communication protocol and PID regulation mode to achieve remote and automatic drainage control, thereby improving drainage efficiency and safety.

[0051] like Figure 7 As shown, the control system in this embodiment consists of a central control unit, a drainage pump cabinet, a disc valve hydraulic station, a mechanical hydraulic mechanism, a disc valve control cabinet, an opening sensor, and network communication equipment. Its technical features include: utilizing MODBUS_TCP communication to establish signal interaction, enabling the central control unit to collect real-time data from the drainage system. Through PID calculations within the PLC, it remotely operates the tailrace disc valve, achieving automatic joint control of the tailrace disc valve and the drainage system. This enhances economic efficiency, improves reusability, reduces manpower, increases efficiency, and achieves precise discharge.

[0052] like Figure 8 As shown, the specific control process is as follows: (1) The valve control cabinet adopts PLC solenoid valve intermittent precision control technology. Its hydraulic part solenoid valve realizes precise control of disc valve, achieving precise opening adjustment of ±0.10%.

[0053] The example is as follows: IF Intermittent Valve Opening Drive = TRUE THEN IF Intermittent Valve Opening ON = TRUE THEN Valve opening action:=TRUE;T1:=T1+1;T2:=0; END_IF; IF valve opening action = TRUE THEN IF T1>=1 AND T1<=pulse width THEN T1:=T1+1; ELSE T1:=0; Valve opening action:=FALSE; T2:=T2+1; END_IF; ELSE IF T2>=1 AND T2<=pulse width THEN T2:=T2+1; ELSE T2:=0; Valve opening action:=TRUE; T1:=T1+1; END_IF; END_IF; ELSE valve opening action:=FALSE;T1:=0;T2:=0; END_IF; IF Intermittent Valve Closure Actuation = TRUE THEN IF Intermittent Valve Closure ON = TRUE THEN Valve closing action:=TRUE;T3:=T3+1;T4:=0; END_IF; IF valve closing action = TRUE THEN IF T3>=1 AND T3<=pulse width THEN T3:=T3+1; ELSE T3:=0; Valve closing action:=FALSE; T4:=T4+1; END_IF; ELSE IF T4>=1 AND T4<=pulse width THEN T4:=T4+1; ELSE T4:=0; Valve closing action:=TRUE; T3:=T3+1; END_IF; END_IF; ELSE valve closing action:=FALSE;T3:=0;T4:=0; END_IF; (2) The MODBUS_TCP communication protocol is adopted for the cluster design. The MODBUS master and slave stations collect data on the water collection well and control the start and stop of the water pump, and send the target adjustment degree to the valve control cabinet PLC.

[0054] (3) A PID control method with feedforward was adopted. This method is an improved PID control algorithm that can more accurately control the system output. The PID algorithm with feedforward can improve the response speed and stability of the control system by adding a feedforward controller. The feedforward controller provides additional control increments based on the number of pumps started in the system, enabling the PID controller to respond to system changes more quickly, thereby improving the performance of the control system. It can automatically adjust according to the difference between the actual water level and the target water level, so that the drainage process is stable within the set range. The following is the basic formula of the PID algorithm with feedforward:

[0055] Where u(t) is the controller output, e(t) is the system error, and uf(t) is the feedforward controller output. Kp, Ki, and Kd are the proportional, integral, and derivative coefficients, respectively, used to adjust the performance of the PID controller.

[0056] The output of the feedforward controller can be calculated based on the predicted output value of the system, as shown in the following formula:

[0057] Where Kf is the feedforward coefficient, and y^(t) is the predicted output value of the system, which can be calculated using known quantities of the system.

[0058] The transfer function is:

[0059] Where Kp, Ki, and Kd are the proportional, integral, and derivative coefficients, respectively, and Kf is the feedforward coefficient. This transfer function can be used to analyze the stability and performance of a control system, and to design and optimize controller parameters.

[0060] The following example program is written using the PLC's AUTOMATION STUDIO software: IF PID operation = TRUE THEN / * Kp1 is initially set to 2*n*0.025, where n is the number of pumps started. Kp = Kp1*n = 0.05n, meaning 6 pumps are between 0.05 and 0.3. The pumping speed of each pump is approximately 2.5% of the discharge speed of the disc valve. The constant multiple of Kp is set to 2* / Kp:=Kp1*n; / * The sampling period T is set to 0.01 according to CYCAL. The value of Ti is much larger than the sampling period T, initially between 1.0 and 1000.0, with a default of 100.* / Ki:= T / Ti; / * The sampling period T is set to 0.01 according to CYCAL. Td is initially set to 0.0 for debugging, and then gradually modified to reduce the oscillation of water level changes. * / Kd:=Td / T; / * n is the number of water pumps started. The pumping speed of each pump is approximately 2.5% of the drain valve's discharge speed, so n = 2.5 · K f ·n, K f The value is 1.0* / Feedforward:= 2.5·Kf·n; / * Calculate water level deviation = water level setpoint – actual water level * / error:= setpoint – current_value; / * Calculate the proportional term * / proportional:=Kp * error; / * Calculate the integral term * / integral:=Ki * error + last_integral; / * Calculate the integral saturation value * / integral_saturation:= output / ki; / * Calculate the integral saturation term * / IF integral > integral_saturation THEN integral:= integral_saturation; ELSIF integral < - integral_saturation THEN integral:= - integral_saturation; END_IF; / * Calculate the differential term * / derivative:=Kd * (error - last_error); / * Calculate the output * / output:= proportional + integral + derivative + Feedforward; / *Saturated output* / IF output > max_output THEN output := max_output; ELSIF output < - max_output THEN output := - max_output; END_IF; / * Save points * / last_integral := integral; / *Save error* / last_error := error; else / *Reset the proportional term to zero* / proportional:=0.0; / *Reset points to zero* / integral:=0.0; / * Clear saturated integral terms * / last_integral:=0.0; / * Clear differential terms * / derivative:=0.0; / * Clear feedforward values ​​to zero * / Feedforward=0.0; / * Output cleared * / output:=0.0; / *Save error* / last_error := error; END_IF; (4) After the hydraulic pipeline and network are connected, no manual intervention or adjustment is required, and unattended operation is possible.

[0061] This embodiment achieves the following technical effects: (1) The automated control of the tailrace disc valve of the hydro-generator unit is realized, which improves the drainage efficiency and safety.

[0062] (2) By adjusting the water level of the reservoir and the operating status of the pump in real time, the drainage volume can be automatically adjusted to ensure water level stability without relying on manual control, thus reducing labor costs.

[0063] (3) By utilizing PLC process control and PID calculation technology, the precision and accuracy of drainage control have been improved.

[0064] (4) By extracting, processing and analyzing the characteristic parameters of the water level in the reservoir and the operation of the pump, the operating status of the turbine can be quickly determined, and fast and effective control can be achieved.

[0065] In practical applications, this embodiment can be applied to tailwater discharge systems in hydropower plants, enabling remote and automatic control of drainage, improving drainage efficiency and safety, reducing costs, and is suitable for various hydropower stations. It can be widely used in the tailwater discharge process of hydropower stations to achieve precise control of tailwater, improve environmental protection capabilities and power supply efficiency, and has broad market application prospects. It has high technical content, economic efficiency and practicality. Through this design, the influence problems inside the turbine casing and tailwater pipe can be effectively solved, and the efficiency and economic benefits of hydropower generation can be improved.

[0066] Although the invention has been described with reference to exemplary embodiments, it should be understood that the invention is not limited to the disclosed exemplary embodiments. The scope of the following claims should be given the broadest interpretation so as to cover all variations and equivalent structures and functions.

Claims

1. A maintenance device for a hydro-generator set, comprising a support frame (1) and a telescopic rotating frame (2); a motor is mounted on the support frame (1); a plurality of telescopic rotating frames (2) are fixedly connected to the rotating shaft of the motor on the support frame (1); characterized in that: It also includes an electric roller (3), a softening unit and a scraping unit; the telescopic rotating frame (2) has an electric roller (3) installed on its telescopic part; the electric roller (3) is equipped with several softening units and scraping units arranged in a ring; the softening unit consists of a toughening column (4) and a water bladder (5); the electric roller (3) is fixedly connected to a toughening column (4) for conveying cleaning agent, all the toughening columns (4) have water holes, all the toughening columns (4) are connected to a water pipe, and the water pipe is located at the center of the electric roller (3); the toughening column (4) is connected to a water bladder (5), and the water bladder (5) is provided with a self-sealing strip (5a); It also includes a blowing cleaning assembly; another telescopic rotating frame (2) is fixedly connected to the motor rotating shaft of the support frame (1), the other telescopic rotating frame (2) is located between the other telescopic rotating frames (2), and the other telescopic rotating frame (2) is staggered from the other telescopic rotating frames (2); a blowing cleaning assembly is installed on the telescopic part of the other telescopic rotating frame (2); the blowing cleaning assembly includes a mounting column (201), an electric rotating ring II (202), a cleaning strip (203), and a soft container (204). Another telescopic rotating frame (2) has a mounting column (201) installed on its telescopic part; an electric rotating ring II (202) is installed on the mounting column (201); several cleaning strips (203) arranged in a ring array are fixed on the electric rotating ring II (202) for insertion into the stator. All cleaning strips (203) are made of tough material. All cleaning strips (203) have through holes (203a). All cleaning strips (203) have partitions inside. The partitions divide the cleaning strips (203) into two channels. It also includes a support assembly; the support frame (1) is equipped with a support assembly at the bottom, and the support assembly is located below the collection assembly; the support assembly includes a mounting ring (301), an electric rotating column (302) and an electrically controlled expansion component (303); a level detector is provided inside the support frame (1); the mounting ring (301) is fixedly connected to the bottom of the support frame (1); several electric rotating columns (302) are connected to the mounting ring (301); each of the electric rotating columns (302) is equipped with an electrically controlled expansion component (303).

2. The hydro-generator unit maintenance device according to claim 1, characterized in that: The scraping unit includes a collection rack (6) and a filter screen (7); the collection rack (6) is fixed to the electric roller (3), and the collection rack (6) is made of a tough material; the filter screen (7) for collecting dirt is fixed to the collection rack (6).

3. A hydro-generator unit maintenance device according to claim 2, characterized in that: It also includes a drain rod (8); a drain rod (8) is fixed inside each of the filters (7), the drain rod (8) can be deformed, and each drain rod (8) is provided with several deformable circular rods arranged in an annular array.

4. A hydro-generator unit maintenance device according to claim 3, characterized in that: All filters (7) are set at an angle, and the gaps between the filters (7) and the stator are staggered.

5. A hydro-generator unit maintenance device according to any one of claims 2-4, characterized in that: It also includes a self-cleaning component; each telescopic rotating frame (2) is equipped with a self-cleaning component, the number of self-cleaning components is the same as the number of scraping units, and all self-cleaning components are matched with the corresponding scraping units; the self-cleaning component includes a fixed frame (101), a flexible strip (102) and a magnetic strip (103); a fixed frame (101) is fixedly connected to the telescopic part of the telescopic rotating frame (2); several flexible strips (102) are fixedly connected inside the fixed frame (101); several magnetic strips (103) are provided at the bottom of the filter screen (7), all magnetic strips (103) are fixedly connected to the collection rack (6), and all magnetic strips (103) attract each other, so that the filter screen (7) can be opened from the bottom.

6. A hydro-generator unit maintenance device according to claim 5, characterized in that: It also includes a collection component; the support frame (1) is equipped with a collection component at the bottom; the collection component includes an electric rotating ring I (110), a placement frame (111), a pull plate (112) and a collection container (113); the support frame (1) is equipped with an electric rotating ring I (110) at the bottom; several placement frames (111) are fixedly connected to the bottom of the support frame (1), and all placement frames (111) are in contact with the electric rotating ring I (110); several pull plates (112) are fixedly connected to the rotating part of the electric rotating ring I (110); each placement frame (111) is equipped with a collection container (113) for collecting the dirt that has been cleaned, the collection container (113) can be folded, and all collection containers (113) are connected to the corresponding pull plate (112).

7. A hydro-generator unit maintenance device according to claim 5, characterized in that: The blowing cleaning assembly also includes a soft container (204); each of the cleaning strips (203) has a soft container (204) installed on its upper and lower sides, and all the soft containers (204) are connected to the corresponding cleaning strips (203).

8. A hydro-generator unit maintenance device according to claim 7, characterized in that: All the electric rotating columns (302) are connected to the adjacent pull plates (112) by thin ropes. The thin ropes are slidably connected to the electric rotating columns (302), and there are two nodes at the slidable connection between the thin ropes and the electric rotating columns (302).

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