Water-turbine generator set runner man door locking device and using method thereof

Abstract

The invention discloses a water-turbine generator set flow channel mandoor locking device and a using method thereof.The water-turbine generator set flow channel mandoor locking device comprises a shell, sleeves, telescopic rods and locking rods, the multiple sleeves are fixedly installed on the outer wall of the shell, the sleeves correspond to corresponding installation holes in a mandoor channel flange in position, one end of each telescopic rod is inserted into the corresponding sleeve in a directional sliding mode, and the other end of each telescopic rod is inserted into the corresponding locking rod; one end of the shell is provided with a telescopic rod, the other end of the shell is provided with a locking rod, a driving device is arranged in the shell, the driving device is connected with the telescopic rod so as to drive the telescopic rod to stretch out and draw back, locking mechanisms are arranged on the locking rods, and after the locking rods are inserted into the corresponding mounting holes, the driving device drives the telescopic rod to retract so that the locking mechanisms can hook the mounting holes. The telescopic rod can be driven by the driving device to directionally stretch out and draw back in the sleeve to adjust the position of the locking rod, and therefore the door can adapt to doors of different sizes. After the locking rods are inserted into the corresponding mounting holes, the driving device drives the telescopic rods to retract so that the locking mechanisms can hook the mounting holes, and mounting is easy and convenient.

Description

Technical Field

[0001] The present invention relates to the technical field of safety control of access doors in the flow channels of hydro-generator units, and particularly to a locking device for access doors in the flow channels of hydro-generator units and its usage method. Background Art

[0002] During the annual overhaul of large hydropower plant units, after the drainage of the unit flow channel and the volute, the staff needs to enter the flow channel or the volute for maintenance operations. However, during special operations such as manually operating the movable guide vanes, there is a risk of mechanical injury in the rotating parts such as the flow channel and the volute, and it is necessary to strictly prohibit personnel from entering. During special operations, currently, the access door mainly relies on setting up temporary barriers, warning signs and manual on-duty to prevent unauthorized entry, but there are the following problems: (1) The safety awareness of external contractors is insufficient, and it is easy to ignore warning signs; (2) Manual on-duty requires a large amount of human resources, which conflicts with the "few people on-duty" management mode of modern hydropower stations; (3) Ordinary mechanical locks are welded fixed structures, which not only cannot flexibly adapt to access doors of different sizes, but also need to manage physical keys, and are inconvenient to install and use. Therefore, we propose a locking device for access doors in the flow channels of hydro-generator units. Summary of the Invention

[0003] The purpose of the present invention is to provide a locking device for access doors in the flow channels of hydro-generator units and its usage method, which can at least solve the problems of inconvenient installation and inability to flexibly adapt to access doors of different sizes.

[0004] To achieve the above purpose, the present invention provides a locking device for access doors in the flow channels of hydro-generator units, including a housing, a sleeve, a telescopic rod and a locking rod. A plurality of sleeves are fixedly installed on the outer wall of the housing, and each sleeve corresponds to the position of the corresponding installation hole on the flange of the access door channel. One end of the telescopic rod is inserted into the sleeve in a directionally sliding manner, and the other end is installed with a locking rod. A driving device is installed in the housing, and the driving device is connected to the telescopic rod to drive the telescopic rod to expand and contract. A locking mechanism is arranged on the locking rod. After each locking rod is inserted into the corresponding installation hole, the driving device drives the telescopic rod to retract, so that the locking mechanism hooks the installation hole.

[0005] The driving device is a stepping motor or a servo motor. A threaded hole is arranged at one end of the telescopic rod located in the sleeve. A screw rod is fixedly installed on the output shaft of the driving device. The screw rod passes through the housing and is in threaded connection with the threaded hole.

[0006] The driving device is an electric cylinder or an electric push rod. The telescopic end of the driving device passes through the housing and is connected to one end of the telescopic rod located in the sleeve.

[0007] It further includes a storage battery and a control system. The storage battery is installed inside the housing, and is electrically connected to the control system to supply power. The control system is electrically connected to the driving device to control the operation of the driving device.

[0008] The control system includes a controller, a driver, and an operation panel. The controller and the driver are installed inside the housing, and the operation panel is installed on the housing. The storage battery is electrically connected to the controller and the driver respectively to supply power. The controller is electrically connected to the driver, the driver is electrically connected to the driving device, and the operation panel is electrically connected to the controller.

[0009] The operation panel includes a size input button, a lock button, an unlock button, and a numeric keypad. Operating the size input button, input the major diameter corresponding to the center of the mounting hole on the access door channel flange and the minor diameter corresponding to the inner wall of the mounting hole on the access door channel flange through the numeric keypad. Operating the lock button, after inputting the password through the numeric keypad, the driving device drives the telescopic rod to retract, and fixes the locking device on the access door channel flange through the locking rod. Operating the unlock button, input the unlock password through the numeric keypad. The operation panel further includes a fingerprint recognition unit and / or a visual recognition unit.

[0010] The locking mechanism is a boss fixedly provided on the locking rod.

[0011] The locking mechanism includes a swing rod, a movable block, and a spring. The locking rod is provided with a chute on the side close to the center of the access door channel flange. A placement groove is provided on the side of the chute away from the telescopic rod. The movable block is slidably installed in the chute. The middle of the swing rod is rotatably installed in the placement groove through a first pivot. One end of the swing rod is provided with an elongated hole. A second pivot penetrates the movable block and the elongated hole to hinge the swing rod and the movable block. The other end of the swing rod is provided with a locking block extending towards the center side of the access door channel flange. The locking rod is provided with a placement hole at the position corresponding to the chute. A spring is installed in the placement hole. One end of the spring abuts against the locking rod, and the other end is connected to the movable block. When the movable block retracts into the chute, the locking block extends out of the placement groove.

[0012] A method for using a locking device for the access door of the runner of a hydro-generator set, which is used to temporarily close the access door of the runner of the hydro-generator set. The method includes the following steps: S1. Press the size input button, input the data of the major diameter and the minor diameter through the numeric keypad, and then the controller controls the driving device to act, so that the diameter of the circle formed by the central axes of the locking rods on the locking device is equal to the major diameter. S2. Install the locking device on the access door channel flange, and insert each locking rod into the corresponding mounting hole. S3. Press the locking button, input the password through the numeric keypad, and then the driving device drives the telescopic rod to retract, so that the diameter of the circle enclosed by the inner sides of the locking rods on the locking device is equal to the minor diameter. At this time, the locking rods fix the locking device on the access door channel flange, and the locking mechanism hooks the installation hole to close the access door of the water turbine generator set flow channel. S4. When it is necessary to remove the locking device, press the unlocking button, and then input the password set in step S3 through the numeric keypad. The locking device is unlocked, and the driving device drives the telescopic rod to extend, so that the diameter of the circle formed by the central axes of the locking rods on the locking device is equal to the major diameter. Then, remove the locking device from the access door channel flange.

[0013] Compared with the prior art, the present invention has the following technical effects: 1. The driving device is installed inside the housing of the present invention, and the sleeve is fixedly installed outside the housing. Driven by the driving device, the telescopic rod can telescopically move in a fixed direction inside the sleeve to adjust the position of the locking rod, so as to solve the problem of adapting to access doors of different sizes. After each locking rod is inserted into the corresponding installation hole, the driving device drives the telescopic rod to retract, so that the locking mechanism hooks the installation hole, which is simple to install and convenient to use.

[0014] 2. The control system of the present invention includes a controller, a driver, and an operation panel. Operate the size input button, and input the major diameter of the access door channel flange corresponding to the center of the installation hole on the access door channel flange and the minor diameter of the access door channel flange corresponding to the inner wall of the installation hole through the numeric keypad; operate the locking button, and after inputting the password through the numeric keypad, the driving device drives the telescopic rod to retract, and the locking device is fixed on the access door channel flange through the locking rod; operate the unlocking button and input the unlocking password through the numeric keypad. The installation and removal of the locking device do not require a physical key, which is simpler to install and more convenient to use.

[0015] 3. The spring of the present invention has sufficient supporting force. After the telescopic rod extends, the spring pushes the movable block out of the chute. At this time, the locking block returns to the placement groove, and only need to pull the locking device outward to remove the locking device from the access door channel flange, making the removal of the locking device more convenient. Description of the Drawings

[0016] In order to more clearly illustrate the technical solutions in the embodiments of the present application or the prior art, the following will briefly introduce the drawings required for the description of the embodiments or the prior art.

[0017] Figure 1 It is the front view structural schematic diagram of the present invention.

[0018] Figure 2 It is the cross-sectional structural schematic diagram of the inside of the housing and the sleeve of the present invention.

[0019] Figure 3 This is the left - view structural schematic diagram of the present invention.

[0020] Figure 4 It is Figure 3 the enlarged structural schematic diagram at position A in

[0021] Figure 5 This is the front - view when the present invention is in use.

[0022] Figure 6 This is the left - view when the present invention is in use.

[0023] Figure 7 It is Figure 6 the enlarged structural schematic diagram at position B in

[0024] Reference numerals: Inlet door channel flange 1, mounting hole 2, large diameter 3, small diameter 4; Shell 10, bottom box 11, cover plate 12; Casing 20; Expansion rod 30, insertion hole 31, threaded hole 32; Locking rod 40, fixing pin 41, placement hole 42, sliding groove 43, placing groove 44; Screw rod 50; Drive device 60, support 61, coupling 62; Battery 70, charging port 71; Control system 80, controller 81, driver 82, operation panel 83, dimension input button 831, lock button 832, unlock button 833, numeric keypad 834, fingerprint recognition unit 84; Locking mechanism 90, swing rod 91, long hole 911, locking block 912, movable block 92, spring 93, set screw 94, first pivot 95, second pivot 96. Detailed implementation manners

[0025] The following details the embodiments of the present invention. The examples of the embodiments are shown in the drawings. The embodiments described below with reference to the drawings are exemplary and are intended to explain the present invention, and should not be construed as limiting the present invention.

[0026] Embodiment 1: Refer to Figures 1-4, A locking device for the access door of the flow passage of a water turbine generator set, which includes a housing 10, a sleeve 20, a telescopic rod 30 and a locking rod 40. A plurality of sleeves 20 are fixedly installed on the outer wall of the housing 10, and each sleeve 20 corresponds to the corresponding installation hole 2 on the access door channel flange 1. One end of the telescopic rod 30 is inserted into the sleeve 20 in a directionally sliding manner, and the other end is installed with a locking rod 40. A driving device 60 is installed in the housing 10, and the driving device 60 is connected to the telescopic rod 30 to drive the telescopic rod 30 to expand and contract. A locking mechanism 90 is provided on the locking rod 40. After each locking rod 40 is inserted into the corresponding installation hole 2, the driving device 60 drives the telescopic rod 30 to retract, so that the locking mechanism 90 hooks the installation hole 2.

[0027] The driving device 60 is installed inside the housing 10, and the sleeve 20 is fixedly installed outside the housing 10. Driven by the driving device 60, the telescopic rod 30 can telescopically move in a direction in the sleeve 20 to adjust the position of the locking rod 40, so as to adapt to the problem of access doors of different sizes. After each locking rod 40 is inserted into the corresponding installation hole 2, the driving device 60 drives the telescopic rod 30 to retract, so that the locking mechanism 90 hooks the installation hole 2, and the locking device is simple and convenient to install.

[0028] Specifically, the housing 10 can be a polygonal box structure as Figure 1 shown, or a circular box structure. A plurality of sleeves 20 are radially and evenly welded on the outer wall of the housing 10. In this embodiment, three sleeves 20 are welded. Of course, according to needs, four or five or six sleeves 20 can also be evenly welded. The sleeve 20 is a rectangular tube structure, and the telescopic rod 30 is a rectangular rod structure, so that the telescopic rod 30 can telescopically move in a direction in the sleeve 20 without rotating.

[0029] The locking rod 40 can be welded to the telescopic rod 30. It can also be installed on the locking rod 40 in a detachable manner. As Figure 3 , 4 shown, an insertion hole 31 is provided on the telescopic rod 30. One end of the locking rod 40 is inserted into the insertion hole 31, and a fixing pin 41 penetrates the pin holes on the telescopic rod 30 and the locking rod 40, thereby fixing the locking rod 40. The advantage of using a detachable structure is that after the locking device fails, the locking device can be removed from the access door channel flange 1 by removing the fixing pin 41.

[0030] In this embodiment, the housing 10 includes a bottom box 11 and a cover plate 12 installed on the bottom box 11. The cover plate 12 and the bottom box 11 can be installed and connected by bolts.

[0031] In this embodiment, refer to Figure 2, The driving device 60 is a stepping motor or a servo motor. One end of the telescopic rod 30 located inside the sleeve 20 is provided with a threaded hole 32. A screw rod 50 is fixedly installed on the output shaft of the driving device 60. After passing through the housing 10, the screw rod 50 is in threaded connection with the threaded hole 32.

[0032] During use, the driving device 60 drives the screw rod 50 to rotate. Since the screw rod 50 is in threaded cooperation with the telescopic rod 30, the telescopic rod 30 is driven to expand and contract for adjustment. To facilitate the installation of the stepping motor or the servo motor, a support 61 is welded inside the housing 10. The stepping motor or the servo motor is installed on the support 61 through bolts, and the output shaft of the stepping motor or the servo motor is fixedly connected to the screw rod 50 through a coupling 62.

[0033] Furthermore, the locking device further includes a storage battery 70 and a control system 80. The storage battery 70 is installed inside the housing 10. The storage battery 70 is electrically connected to the control system 80 to supply power, and the control system 80 is electrically connected to the driving device 60 to control the operation of the driving device 60.

[0034] Specifically, the control system 80 includes a controller 81, a driver 82, and an operation panel 83. The controller 81 and the driver 82 are installed inside the housing 10, and the operation panel 83 is installed on the housing 10. The storage battery 70 is electrically connected to the controller 81 and the driver 82 respectively to supply power. The controller 81 is electrically connected to the driver 82, the driver 82 is electrically connected to the driving device 60, and the operation panel 83 is electrically connected to the controller 81.

[0035] In this embodiment, a charging port 71 is further installed on the housing 10. The charging port 71 is electrically connected to the storage battery 70 to charge the storage battery 70.

[0036] The controller 81 is used to receive and process the commands of the operation panel 83. The driver 82 is used to receive the commands of the controller 81 and convert the electrical pulses into angular displacements to drive the stepping motor or the servo motor to rotate. The operation panel 83 is used to input operation commands and data.

[0037] It should be noted that the operation panel 83 can be a physical panel, such as adopting the operation panel structure on an ATM, or it can be a touch screen. That is to say, the buttons on the operation panel 83 can be physical or virtual buttons on the touch screen.

[0038] Specifically, referring to Figure 1 , the operation panel 83 includes a size input button 831, a lock button 832, an unlock button 833, and a numeric keypad 834.

[0039] Among them, first operate the dimension input button 831, and then input the major diameter 3 corresponding to the center of the mounting hole 2 on the access door channel flange 1 and the minor diameter 4 corresponding to the inner wall of the mounting hole 2 on the access door channel flange 1 through the numeric keypad 834, as Figure 5 shown.

[0040] Specifically, the major diameter 3 is the diameter of the circle formed by the centers of each mounting hole 2, and the minor diameter 4 is the diameter of the circumscribed circle of each mounting hole 2 on the side of the housing 10.

[0041] First operate the locking button 832, and then input the password through the numeric keypad 834. After that, the driving device 60 drives the telescopic rod 30 to retract, and the locking device is fixed on the access door channel flange 1 through the locking rod 40.

[0042] First operate the unlocking button 833, and then input the unlocking password through the numeric keypad 834 to unlock the locking device. Furthermore, referring to Figure 1 , the operation panel 83 further includes a fingerprint recognition unit 84 and / or a visual recognition unit.

[0043] Specifically, a fingerprint recognition unit 84 is further installed on the housing 10, or a visual recognition unit is installed, or both a fingerprint recognition unit 84 and a visual recognition unit are installed. The fingerprint recognition unit 84 and the visual recognition unit are electrically connected to the controller 81. The visual recognition unit is a visual recognition camera. Personnel are confirmed and unlocked through the fingerprint recognition unit 84 and the visual recognition unit.

[0044] In this embodiment, the locking mechanism 90 is a boss fixed on the locking rod 40. When the telescopic rod 30 retracts, the locking rod 40 abuts against the mounting hole 2. At this time, the boss is stuck on the side of the mounting hole 2 away from the telescopic rod 30, so that the locking device cannot be taken out.

[0045] Embodiment 2: The difference between this embodiment and Embodiment 1 is that the driving device 60 is an electric cylinder or an electric push rod, and the telescopic end of the driving device 60 passes through the housing 10 and is connected to one end of the telescopic rod 30 located inside the sleeve 20.

[0046] When in use, the driving device 60 pushes and pulls the telescopic rod 30, thereby driving the telescopic rod 30 to expand and contract for adjustment.

[0047] Embodiment 3: The difference between this embodiment and Embodiment 1 is that referring to Figure 3 , 4, the locking mechanism 90 includes a swing rod 91, a movable block 92 and a spring 93. A chute 43 is provided on the locking rod 40 on the side close to the center of the access door passage flange 1. A placement groove 44 is provided on the side of the chute 43 away from the telescopic rod 30. The movable block 92 is slidably installed in the chute 43. The middle of the swing rod 91 is rotatably installed in the placement groove 44 through a first pivot 95. A long hole 911 is provided at one end of the swing rod 91. A second pivot 96 penetrates into the movable block 92 and the long hole 911 to hinge the swing rod 91 and the movable block 92. The other end of the swing rod 91 is provided with a locking block 912 extending toward the center side of the access door passage flange 1; the locking rod 40 is provided with a placement hole 42 at the position corresponding to the chute 43. A spring 93 is installed in the placement hole 42. One end of the spring 93 abuts against the locking rod 40, and the other end is connected to the movable block 92; when the movable block 92 retracts into the chute 43, the locking block 912 extends out of the placement groove 44.

[0048] Specifically, referring to Figure 4 , a placement hole 42 is provided on the locking rod 40. A spring 93 is installed in the placement hole 42. The placement hole 42 is blocked by a set screw 94. One end of the spring 93 abuts against the set screw 94, and the other end abuts against the movable block 92. The chute 43 is a convex groove, and the movable block 92 is a convex block. The movable block 92 can slide up and down in the chute 43. A notch is provided on the side of the movable block 92 close to the swing rod 91. One end of the swing rod 91 provided with the long hole 911 is installed in this notch. The second pivot 96 passes through the movable block 92 and the long hole 911. In the natural state, as Figure 4 shown, the movable block 92 extends out under the action of the spring 93, and the locking block 912 at the other end of the swing rod 91 is located in the placement groove 44.

[0049] When the locking rod 40 is inserted into the mounting hole 2, the telescopic rod 30 retracts. At this time, the locking rod 40 abuts against the mounting hole 2, the spring 93 is compressed, the movable block 92 retracts into the chute 43, and the locking block 912 at the other end of the swing rod 91 extends out of the placement groove 44. As Figure 7 shown, the locking block 912 hooks the mounting hole 2, so that the locking device cannot be taken out from the access door passage flange 1.

[0050] In this embodiment, the spring 93 has sufficient supporting force. After the telescopic rod 30 extends, the spring 93 pushes the movable block 92 out of the chute 43. At this time, the locking block 912 returns to the placement groove 44, and only need to pull the locking device outward to take out the locking device from the access door passage flange 1.

[0051] In Embodiment 1, the locking mechanism 90 is a convex platform fixedly provided on the locking rod 40. If it is necessary to take out the locking device, after the telescopic rod 30 extends, it is necessary to manually lift the locking device and move the locking device up, down, left and right so that the convex platforms on each locking rod 40 do not interfere with the corresponding mounting holes 2 before the driving locking device can be pulled out outward.

[0052] Example 4: Based on Example 1, Example 2, or Example 3, the present invention also discloses a method for using a locking device for the access door of the water turbine generator set flow passage, which is used to temporarily close the access door of the water turbine generator set flow passage. The method for use includes the following steps: S1. Press the size input button 831, input the data of the major diameter 3 and the minor diameter 4 through the digital input keyboard 834. After pressing the OK key, the controller 81 controls the driving device 60 to act, so that the diameter of the circle formed by the central axes of the locking rods 40 on the locking device is equal to the major diameter 3.

[0053] S2. Install the locking device on the access door channel flange 1, and insert the locking rods 40 into the corresponding mounting holes 2 respectively.

[0054] S3. Press the locking button 832, input the password through the digital input keyboard 834. After pressing the OK key, the driving device 60 drives the telescopic rod 30 to retract, so that the diameter of the circle formed by the inner sides of the locking rods 40 on the locking device is equal to the minor diameter 4. At this time, the locking rods 40 fix the locking device on the access door channel flange 1, and the locking mechanism 90 hooks the mounting hole 2 to close the access door of the water turbine generator set flow passage.

[0055] S4. When it is necessary to remove the locking device, press the unlocking button 833, and then input the password set in step S3 through the digital input keyboard 834. The locking device is unlocked, and the driving device 60 drives the telescopic rod 30 to extend, so that the diameter of the circle formed by the central axes of the locking rods 40 on the locking device is equal to the major diameter 3. Then, remove the locking device from the access door channel flange 1.

[0056] Those of ordinary skill in the art should understand that the discussion of any above embodiment is only exemplary; under the concept of the present invention, the technical features in the above embodiments or different embodiments can also be combined, and the steps can be implemented in any order, and there are many other variations in different aspects of the present invention as described above. For the sake of brevity, they are not provided in detail.

[0057] The present invention aims to cover all such substitutions, modifications, and variations that fall within the broad scope of the appended claims. Therefore, any omissions, modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention shall be included within the protection scope of the present invention.

Claims

1. A lock and closure device for a runner access door of a water turbine generator set, characterized in that: It includes a housing (10), a sleeve (20), a telescopic rod (30), and a locking rod (40). A plurality of sleeves (20) are fixedly installed on the outer wall of the housing (10), and each sleeve (20) corresponds to the position of a corresponding mounting hole (2) on the access door channel flange (1). One end of the telescopic rod (30) is inserted into the sleeve (20) in a directionally sliding manner, and the other end is provided with a locking rod (40). A driving device (60) is installed in the housing (10), and the driving device (60) is connected to the telescopic rod (30) to drive the telescopic rod (30) to extend and retract. A locking mechanism (90) is provided on the locking rod (40). After each locking rod (40) is inserted into the corresponding mounting hole (2), the driving device (60) drives the telescopic rod (30) to retract, so that the locking mechanism (90) hooks the mounting hole (2).

2. The water turbine generator set runner access door locking device according to claim 1, characterized in that: The driving device (60) is a stepper motor or a servo motor. A threaded hole (32) is provided at one end of the telescopic rod (30) located in the sleeve (20). A screw rod (50) is fixedly installed on the output shaft of the driving device (60). The screw rod (50) passes through the housing (10) and is in threaded connection with the threaded hole (32).

3. The water turbine generator set runner access door locking device according to claim 1, characterized in that: The driving device (60) is an electric cylinder or an electric push rod. The telescopic end of the driving device (60) passes through the housing (10) and is connected to one end of the telescopic rod (30) located in the sleeve (20).

4. The water turbine generator set runner access door locking device according to claim 2 or 3, characterized in that: It further includes a storage battery (70) and a control system (80). The storage battery (70) is installed in the housing (10), and the storage battery (70) is electrically connected to the control system (80) to supply power. The control system (80) is electrically connected to the driving device (60) to control the operation of the driving device (60).

5. The water turbine generator set runner access door locking device according to claim 4, characterized in that: The control system (80) includes a controller (81), a driver (82), and an operation panel (83). The controller (81) and the driver (82) are installed in the housing (10), and the operation panel (83) is installed on the housing (10). The storage battery (70) is electrically connected to the controller (81) and the driver (82) respectively to supply power. The controller (81) is electrically connected to the driver (82), the driver (82) is electrically connected to the driving device (60), and the operation panel (83) is electrically connected to the controller (81).

6. The water turbine generator set runner access door locking device according to claim 5, characterized in that: The operation panel (83) includes a size input button (831), a locking button (832), an unlocking button (833), and a numeric keypad (834). Operating the size input button (831), input the major diameter (3) of the access door channel flange (1) corresponding to the center of the mounting hole (2) on the access door channel flange (1), and the minor diameter (4) of the inner wall of the mounting hole (2) corresponding to the access door channel flange (1) through the numeric keypad (834). Operating the locking button (832), after inputting the password through the numeric keypad (834), the driving device (60) drives the telescopic rod (30) to retract, and the locking device is fixed on the access door channel flange (1) through the locking rod (40). Operating the unlocking button (833), input the unlocking password through the numeric keypad (834).

7. The water turbine generator set runner access door locking device according to claim 6, characterized in that: The operation panel (83) further includes a fingerprint recognition unit (84) and / or a visual recognition unit.

8. The water turbine generator set runner access door locking device according to claim 1, characterized in that: The locking mechanism (90) is a boss fixedly arranged on the locking rod (40).

9. The water turbine generator set runner access door locking device according to claim 1, characterized in that: The locking mechanism (90) includes a swing rod (91), a movable block (92) and a spring (93). A chute (43) is arranged on the locking rod (40) on the side close to the center of the access door channel flange (1). A placement groove (44) is arranged on the side of the chute (43) far from the telescopic rod (30). The movable block (92) is slidably installed in the chute (43). The middle of the swing rod (91) is rotatably installed in the placement groove (44) through a first pivot shaft (95). A long hole (911) is arranged at one end of the swing rod (91). A second pivot shaft (96) penetrates into the movable block (92) and the long hole (911) to hinge the swing rod (91) and the movable block (92). The other end of the swing rod (91) is provided with a locking block (912) extending towards the center side of the access door channel flange (1). An installation hole (42) is arranged on the locking rod (40) at the position corresponding to the chute (43). A spring (93) is installed in the installation hole (42). One end of the spring (93) abuts against the locking rod (40), and the other end is connected to the movable block (92). When the movable block (92) retracts into the chute (43), the locking block (912) extends out of the placement groove (44).

10. The method of using the flow passage access door locking device for a hydro-generator set according to claim 6, characterized in that: For temporarily closing the access door of the runner of a water turbine generator unit, the usage method includes the following steps: S1. Press the size input button (831), input the data of the major diameter (3) and the minor diameter (4) through the digital input keyboard (834). Then, the controller (81) controls the driving device (60) to act, so that the diameter of the circle formed by the central axes of the locking rods (40) on the locking device is equal to the major diameter (3); S2. Install the locking device on the access door channel flange (1), and insert the locking rods (40) into the corresponding installation holes (2) respectively; S3. Press the locking button (832), input the password through the digital input keyboard (834). Then, the driving device (60) drives the telescopic rod (30) to retract, so that the diameter of the circle surrounded by the inner sides of the locking rods (40) on the locking device is equal to the minor diameter (4). At this time, the locking rods (40) fix the locking device on the access door channel flange (1), and the locking mechanism (90) hooks the installation hole (2) to close the access door of the runner of the water turbine generator unit; S4. When it is necessary to remove the locking device, press the unlocking button (833). Then, input the password set in step S3 through the digital input keyboard (834). The locking device is unlocked, and the driving device (60) drives the telescopic rod (30) to extend, so that the diameter of the circle formed by the central axes of the locking rods (40) on the locking device is equal to the major diameter (3). Then, remove the locking device from the access door channel flange (1).

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