Valve operating mechanism for nuclear power station

Abstract

The utility model relates to the technical field of nuclear power station production and operation, and provides a nuclear power station valve operating mechanism which comprises a valve opener, an operation rotating wheel, a flexible connecting shaft and a chuck, the chuck is used for being detachably connected with a hand wheel of a valve, the first end of the flexible connecting shaft is connected with the chuck, and the second end of the flexible connecting shaft is connected with the operation rotating wheel. The operation rotating wheel is provided with a connecting hole, the valve opener is detachably connected to the connecting block, and the valve opener drives the operation rotating wheel to rotate so as to drive a hand wheel of the valve to rotate. After the operating mechanism is applied, a large number of long-stroke valves of the nuclear power station can be remotely opened and closed, the labor intensity of workers is greatly reduced, meanwhile, the dose exposure of workers working near a hot spot is reduced, the safety guarantee of the workers is effectively improved, and the maintenance time is shortened; the valve opener can be detached from the connecting hole of the operation rotating wheel and is not permanently fixed to the operation rotating wheel, the chuck can be separated from the hand wheel, and the anti-seismic evaluation of the nuclear power station equipment cannot be affected.

Description

Technical Field

[0001] This utility model relates to the field of nuclear power plant production and operation technology, and in particular to a valve operating mechanism for nuclear power plants. Background Technology

[0002] During the operation of a nuclear power plant, valves frequently need to be opened and closed. Generally, these valves are opened and closed manually, requiring the valve disc to be rotated hundreds of times, which is extremely time-consuming and physically demanding, especially for large-diameter manual butterfly valves, gate valves, globe valves, and manual valves with turbine reduction mechanisms. Furthermore, if the valves are located near hot spots within the nuclear power plant, manual operation on-site increases the time and potential for radiation exposure. Utility Model Content

[0003] The purpose of this utility model is to provide a valve operating mechanism for nuclear power plants, aiming to solve the technical problems of time-consuming and physically demanding valve opening and closing in existing nuclear power plants.

[0004] This application provides a valve operating mechanism for a nuclear power plant. The valve operating mechanism includes a valve opener, an operating wheel, a flexible connecting shaft, and a chuck. The chuck is detachably connected to the handwheel of the valve. A first end of the flexible connecting shaft is connected to the chuck, and a second end of the flexible connecting shaft is connected to the operating wheel. The operating wheel has a connecting hole, and the valve opener is detachably connected to the connecting hole. The valve opener drives the operating wheel to rotate, thereby driving the handwheel of the valve to rotate.

[0005] In one embodiment, the valve operating mechanism for the nuclear power plant further includes an operating rope connected to the chuck, with one end of the operating rope positioned away from the chuck, and the operating rope used to pull the chuck and the handwheel of the valve to engage or disengage.

[0006] In one embodiment, the valve operating mechanism for a nuclear power plant further includes an adapter and a first fixed bracket. One end of the first fixed bracket is mounted on a wall, and the other end of the first fixed bracket is provided with a first mounting hole. The first end of the flexible connecting shaft is rotatably mounted in the first mounting hole. One end of the adapter is fixedly connected to the first end of the flexible connecting shaft, and the chuck is slidably mounted on the other end of the adapter in the vertical direction.

[0007] In one embodiment, the valve operating mechanism for the nuclear power plant further includes a pull rope bearing, the chuck being rotatably fitted inside the pull rope bearing, the pull rope bearing having a rope hole, and the operating pull rope being connected to the rope hole.

[0008] In one embodiment, the valve operating mechanism for a nuclear power plant further includes a first position block and a second position block, which are fixedly disposed on a wall at a distance from each other. The first position block has a first position hole, and the second position block has a second position hole. The end of the operating pull rope can be selectively connected to either the first position hole or the second position hole.

[0009] In one embodiment, the chuck has a slot that detachably nests the handwheel of the valve.

[0010] In one embodiment, the chuck includes a base plate and two chuck plates spaced apart from each other on the base plate, the gap between the two chuck plates forming the chuck slot.

[0011] In one embodiment, a magnetic block is mounted on the outer wall of the card plate, the magnetic block being used to attract the handwheel of the valve to the groove wall of the card slot.

[0012] In one embodiment, the valve operating mechanism for the nuclear power plant further includes a multiplier, and the first end of the flexible connecting shaft is connected to the chuck via the multiplier.

[0013] In one embodiment, the valve operating mechanism for the nuclear power plant further includes a second fixed bracket, one end of which is fixed to a wall, and the other end of which has a second mounting hole, wherein the middle portion of the flexible connecting shaft is rotatably mounted in the second mounting hole.

[0014] The beneficial effects of the valve operating mechanism for nuclear power plants provided by this utility model are as follows: the valve opener drives the operating wheel to rotate automatically, the operating wheel drives the flexible connecting shaft and chuck to rotate, and the handwheel of the valve, which is detachably connected to the chuck, rotates accordingly, realizing remote control of valve opening and closing. This solves the technical problem of time-consuming and labor-intensive valve opening and closing in existing nuclear power plants. After the application of the operating mechanism, remote opening and closing operation can be achieved for a large number of long-stroke valves in nuclear power plants, greatly reducing the labor intensity of workers, shortening the valve opening and closing time, and reducing the radiation dose of personnel working near hot spots, effectively improving personnel safety, reducing maintenance time, and when not under maintenance, the valve opener can be detached from the connection hole of the operating wheel and is not permanently fixed to the operating wheel. The chuck can be separated from the handwheel, which will not affect the seismic assessment of nuclear power plant equipment. Attached Figure Description

[0015] To more clearly illustrate the technical solutions in the embodiments of this utility model, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0016] Figure 1 A schematic diagram of the structure of a valve operating mechanism for a nuclear power plant provided in an embodiment of this utility model;

[0017] Figure 2 A schematic diagram of the operating wheel of a valve operating mechanism for a nuclear power plant provided in an embodiment;

[0018] Figure 3 for Figure 1 Enlarged view of section A in the image;

[0019] Figure 4 A schematic diagram of the valve opener of a valve operating mechanism for a nuclear power plant provided in an embodiment;

[0020] Figure 5 A schematic diagram of the flexible connecting shaft of the valve operating mechanism for a nuclear power plant provided in an embodiment;

[0021] Figure 6 for Figure 1 Enlarged view of section B in the image;

[0022] Figure 7 A schematic diagram of the adapter for a valve operating mechanism used in a nuclear power plant, provided as an example;

[0023] Figure 8 for Figure 7 Another perspective view of the adapter in the image;

[0024] Figure 9 A schematic diagram of the chuck of a valve operating mechanism for a nuclear power plant provided as an example;

[0025] Figure 10 Another structural schematic diagram of a valve operating mechanism for a nuclear power plant provided in this embodiment of the utility model;

[0026] Figure 11 for Figure 1 Enlarged view of section C in the image;

[0027] Figure 12 A schematic diagram of the structure of the first fixed bracket of the valve operating mechanism for a nuclear power plant provided in the embodiment;

[0028] Figure 13 This is a schematic diagram of the structure of the second fixed support for the valve operating mechanism of a nuclear power plant provided in an embodiment.

[0029] The following are the labeling elements in the figure:

[0030] 10. Valve opener; 11. Motor; 12. Rotary output shaft; 13. Rechargeable battery; 14. Control button; 15. Communication module; 20. Operating wheel; 21. Connecting hole; 30. Flexible connecting shaft; 40. Chuck; 41. Base plate; 42. Card plate; 43. Card slot; 44. Magnetic block; 45. Mounting slot; 50. Valve; 51. Handwheel; 61. Operating rope; 62. Adapter; 63. Rope bearing; 64. Multiplier; 65. Coupling; 66. First position block; 661. First position hole; 67. Second position block; 671. Second position hole; 70. First fixed bracket; 71. First mounting hole; 80. Second fixed bracket; 81. Second mounting hole. Detailed Implementation

[0031] The embodiments of this utility model are described in detail below. Examples of these embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and intended to explain this utility model, and should not be construed as limiting this utility model.

[0032] Throughout this specification, references to "an embodiment" or "an embodiment" mean that a particular feature, structure, or characteristic described in connection with an embodiment is included in at least one embodiment of this application. Therefore, the phrases "in one embodiment" or "in some embodiments" appear in various places throughout the specification, and not all refer to the same embodiment. Furthermore, in one or more embodiments, particular features, structures, or characteristics may be combined in any suitable manner.

[0033] In the description of this utility model, it should be understood that the terms "length", "width", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model.

[0034] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined with "first" or "second" may explicitly or implicitly include one or more of that feature.

[0035] In this utility model, unless otherwise explicitly specified and limited, the terms "installation," "connection," "joining," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model according to the specific circumstances.

[0036] Combination Figures 1 to 3 This application provides a valve operating mechanism for a nuclear power plant. The valve operating mechanism for a nuclear power plant includes a valve opener 10, an operating wheel 20, a flexible connecting shaft 30, and a chuck 40. The chuck 40 is detachably connected to the handwheel 51 of the valve 50. The first end of the flexible connecting shaft 30 is connected to the chuck 40, and the second end of the flexible connecting shaft 30 is connected to the operating wheel 20. The operating wheel 20 has a connecting hole 21, and the valve opener 10 is detachably connected to the connecting hole 21. The valve opener 10 drives the operating wheel 20 to rotate, thereby driving the handwheel 51 of the valve 50 to rotate.

[0037] The valve opener 10 drives the operating wheel 20 to rotate automatically. The operating wheel 20 drives the flexible connecting shaft 30 and the chuck 40 to rotate, and the handwheel 51 of the valve 50 connected to the chuck 40 rotates accordingly, realizing remote control of the opening and closing of the valve 50. This solves the technical problem of time-consuming and labor-intensive valve opening and closing in existing nuclear power plants. After the application of the operating mechanism, remote opening and closing operations can be achieved for a large number of long-stroke valves 50 in nuclear power plants, greatly reducing the labor intensity of workers and shortening the valve opening and closing time. Furthermore, when not under maintenance, the valve opener 10 can be removed from the connection hole 21 of the operating wheel 20 and is not permanently fixed to the operating wheel 20. The chuck 40 can be separated from the handwheel 51, which will not affect the seismic assessment of nuclear power plant equipment.

[0038] Meanwhile, the radiation dose in the area where the handwheel 51 of some valves 50 is located is too high. The staff can operate the handwheel 51 remotely to control its working status and avoid being exposed to radiation dose, thereby protecting the health of the staff, reducing the radiation dose to personnel working near the hot spot, effectively improving personnel safety, and reducing maintenance time.

[0039] In some embodiments, please combine Figure 4 The valve opener 10 includes a control board, a motor 11 and a rotary output shaft 12. The motor 11 is connected to the rotary output shaft 12 to drive the rotary output shaft 12 to rotate. The rotary output shaft 12 can be inserted into the connection hole 21. The control board is electrically connected to the motor 11 and is used to control the start and stop of the motor 11.

[0040] The shape of the rotary output shaft 12 is adapted to the shape of the connecting hole 21. The rotary output shaft 12 is inserted into the connecting hole 21. The control board controls the motor 11 to start, so that the rotary output shaft 12 drives the operating wheel 20 to rotate, which in turn drives the chuck 40 to rotate. Depending on the direction of rotation, the valve is opened or closed.

[0041] Specifically, the valve opener 10 also includes a communication module 15, which is electrically connected to the control board. The communication module 15 communicates with an external controller wirelessly or via a wired connection to receive control commands sent by the external controller. The communication module 15 can be integrated into the control board.

[0042] Specifically, please combine Figure 4 The valve opener 10 also includes a rechargeable battery 13, which is electrically connected to the control board and used to provide power to the motor 11. In this case, the valve opener 10 does not need to be connected to electricity on site, making its application scenarios more diverse.

[0043] Specifically, the valve opener 10 also includes a power plug, which is electrically connected to the control board and is used to connect to an external power source. In this case, the valve opener 10 is connected to the external power source via the power plug, thus enabling the motor 11 to operate.

[0044] Specifically, the valve opener 10 also includes a control button 14, which is electrically connected to the control board to control the start and stop of the motor 11. Operators can conveniently control the start and stop of the motor 11 by pressing the control button 14.

[0045] Optionally, the connecting hole 21 can be a square hole, a triangular hole, an elliptical hole, or an irregular hole.

[0046] In some embodiments, combined with Figure 1 and Figure 5 The flexible connecting shaft 30 consists of a steel wire core, a metal double-wire tube, and a rubber sleeve. The metal double-wire tube protects the core, and the rubber sleeve protects the tube. (Rigid shaft.)

[0047] In some embodiments, combined with Figure 10 The valve operating mechanism for nuclear power plants also includes a multiplier 64, with the first end of the flexible connecting shaft 30 connected to the chuck 40 via the multiplier 64. The multiplier 64 amplifies the input force. In the operation of nuclear power plant valves 50, some valves 50 may require significant torque to open or close, especially large-diameter valves or those operating under high pressure. For example, when the operating wheel 20 transmits a small force to the multiplier 64 via the flexible connecting shaft 30, the multiplier 64 can amplify this force proportionally before transmitting it to the chuck 40, enabling the chuck 40 to drive the valve handwheel 51 with sufficient force, thus achieving normal operation of the valve 50.

[0048] In some embodiments, the valve opener 10 is stored in a tool library and brought to the site by the person in charge when needed. The operating wheel 20, flexible connecting shaft 30, and chuck 40 are installed on-site and are normally detached from the valve 50. When valve 50 needs to be operated, the chuck 40 quickly connects to the valve 50 handwheel 51, and the valve 50 is operated using the charging motor 11.

[0049] In some embodiments, combined with Figure 1 and Figure 6 The valve operating mechanism for nuclear power plants also includes an operating rope 61, which is connected to the chuck 40. The end of the operating rope 61 is positioned away from the chuck 40, and it is used to pull the handwheel 51 of the chuck 40 to engage or disengage. Based on this, operators can use the operating rope 61 to operate the valve from a safe area away from the valve 50. For example, after operating the valve 50 near a hot spot such as the reactor, operators can disengage the chuck 40 from the handwheel 51 without approaching a high radiation source, effectively reducing the radiation dose to the human body and ensuring the health and safety of the personnel.

[0050] Furthermore, when performing maintenance on valve 50 or its operating mechanism, it is necessary to separate chuck 40 from handwheel 51. The operating rope 61 allows for this separation without affecting the layout of other surrounding equipment. Manual disassembly at close range might require moving auxiliary equipment or pipelines, but the operating rope 61 avoids this disruption to the equipment layout.

[0051] In one embodiment, combined with Figure 6 , Figure 7 , Figure 8 and Figure 12 The valve operating mechanism for nuclear power plants also includes an adapter 62 and a first fixed bracket 70. One end of the first fixed bracket 70 is mounted on a wall, and the other end of the first fixed bracket 70 is provided with a first mounting hole 71. The first end of the flexible connecting shaft 30 is rotatably mounted in the first mounting hole 71 to realize the transmission of rotational torque.

[0052] The first fixed bracket 70 provides a stable support point for the flexible connecting shaft 30.

[0053] Specifically, one end of the adapter 62 is fixedly connected to the first end of the flexible connecting shaft 30, and the chuck 40 is slidably mounted on the other end of the adapter 62 in the vertical direction, so that the movement direction of the chuck 40 is fixed, that is, in the vertical direction. When the operating pull rope 61 pulls the chuck 40, the chuck 40 separates from the handwheel 51 in the vertical direction. When the operating pull rope 61 lowers the chuck 40, the chuck 40 engages with the handwheel 51 in the vertical direction under the action of gravity, and the engagement is precise.

[0054] Specifically, one end of the adapter 62 is fixedly connected to the first end of the flexible connecting shaft 30 via a coupling 65.

[0055] In one embodiment, combined with Figure 6 The valve operating mechanism for nuclear power plants also includes a draw rope bearing 63. A chuck 40 is rotatably fitted within the draw rope bearing 63, which has a rope hole through which the operating draw rope 61 is connected. Therefore, due to the presence of the draw rope bearing 63, the chuck 40 can rotate relative to the operating draw rope 61 without the rope becoming entangled. The presence of the draw rope bearing 63 does not obstruct the rotation of the chuck 40, ensuring smooth operation of the valve 50. The rope hole of the draw rope bearing 63 provides a relatively fixed connection position for the operating draw rope 61, helping to prevent unnecessary twisting or bending of the operating draw rope 61 during pulling, reducing the risk of damage to the operating draw rope 61 due to excessive twisting.

[0056] Specifically, in combination Figure 6 and Figure 9 The chuck 40 has a mounting groove 45, and the draw rope bearing 63 is mounted in the mounting groove 45 to achieve three-dimensional positioning. The chuck 40 can rotate relative to the draw rope bearing 63.

[0057] In one embodiment, combined with Figure 1 and Figure 11 The valve operating mechanism for nuclear power plants also includes a first position block 66 and a second position block 67, which are fixedly mounted on a wall at intervals. The first position block 66 has a first position hole 661, and the second position block 67 has a second position hole 671. The end of the operating rope 61 can be selectively connected to either the first position hole 661 or the second position hole 671. When the end of the operating rope 61 is connected to the first position hole 661 of the first position block 66, the chuck 40 is pulled vertically upwards, separating the chuck 40 from the handwheel 51. When the operating rope 61 is connected to the second position hole 671 of the second position block 67, the chuck 40 moves downwards to the spokes of the nested handwheel 51.

[0058] In some embodiments, combined with Figure 6 and Figure 9 The chuck 40 has a slot 43, which detachably nests the handwheel 51 of the valve 50. When operation of the valve 50 is required, the slot 43 of the chuck 40 can be quickly nested onto the handwheel 51 of the valve 50. For example, in routine maintenance or emergency operation scenarios at a nuclear power plant, staff can quickly connect the operating mechanism to the valve 50, saving preparation time. Furthermore, the nesting method eliminates the need for cumbersome bolt tightening, making operation simple and quick. After the valve 50 has been operated, the chuck 40 can be easily detached from the handwheel 51 of the valve 50.

[0059] The structure of the slot 43 makes the force transmission between the chuck 40 and the handwheel 51 more stable. During the opening or closing of the valve, the rotating wheel 20 rotates, and the force is transmitted to the chuck 40 through the flexible connecting shaft 30. Then, the force is transmitted from the chuck 40 to the handwheel 51 of the valve 50 through the slot 43. The force will not fluctuate greatly, which is conducive to the smooth operation of the valve 50.

[0060] It should be noted that the number of slots 43 and the number of spokes can be equal or unequal. For example, as shown in the figure, there are five spokes and three slots 43, so the two numbers are not equal.

[0061] In one embodiment, combined with Figure 1 and Figure 9 The chuck 40 includes a base plate 41 and two chuck plates 42 spaced apart on the base plate 41. The gap between the two chuck plates 42 forms a chuck groove 43, which can nest spokes. The structure is simple.

[0062] Optionally, the base plate 41 and the clamping plate 42 are integrally formed. Optionally, the clamping plate 42 is welded and fixed to the base plate 41.

[0063] In one embodiment, a magnet 44 is mounted on the outer wall of the chuck 42. The magnet 44 is used to attract the handwheel 51 of the valve 50 to the groove wall of the chuck 43. During the operation of the nuclear power plant valve 50, the handwheel 51 of the valve 50 needs to be stably engaged with the groove 43 of the chuck 40 to ensure the accuracy and safety of the operation. For example, when the nuclear power plant is in operation, there may be slight vibrations. The attraction of the magnet 44 can prevent the handwheel 51 from loosening or disengaging from the groove 43 due to vibration.

[0064] When connecting the chuck 40 to the handwheel 51 of the valve 50, the magnetic block 44 simplifies the installation process. Workers do not need to use complex tools or expend significant effort to ensure the handwheel 51 is accurately positioned and fixed in the slot 43. The magnetic block 44 automatically attracts the handwheel 51 to the appropriate position in the slot 43, reducing installation time and labor costs, and improving installation efficiency.

[0065] In one embodiment, combined with Figure 1 and Figure 13The valve operating mechanism for nuclear power plants also includes a second fixed bracket 80. One end of the second fixed bracket 80 is fixed to a wall, and the other end has a second mounting hole 81. The middle portion of the flexible connecting shaft 30 is rotatably mounted in the second mounting hole 81. The second fixed bracket 80 provides an intermediate support point for the flexible connecting shaft 30. In the valve 50 operating mechanism of a nuclear power plant, the flexible connecting shaft 30 may be relatively long, especially when the distance between the valve 50 and the operating components is far. Without this intermediate support point, the flexible connecting shaft 30 may experience instability such as sagging or swaying due to its own weight or the forces applied during operation.

[0066] The above description is only a preferred embodiment of the present utility model and is not intended to limit the present utility model. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present utility model should be included within the protection scope of the present utility model.

Claims

1. A valve operating mechanism for a nuclear power plant, characterized in that: The valve operating mechanism for the nuclear power plant includes a valve opener, an operating wheel, a flexible connecting shaft, and a chuck. The chuck is detachably connected to the valve's handwheel. The first end of the flexible connecting shaft is connected to the chuck, and the second end of the flexible connecting shaft is connected to the operating wheel. The operating wheel has a connecting hole, and the valve opener is detachably connected to the connecting hole. The valve opener drives the operating wheel to rotate, thereby driving the valve's handwheel to rotate.

2. The valve operating mechanism for nuclear power plants according to claim 1, characterized in that: The valve operating mechanism for the nuclear power plant also includes an operating rope, which is connected to the chuck. The end of the operating rope is located away from the chuck, and the operating rope is used to pull the chuck and the handwheel of the valve to engage or disengage.

3. The valve operating mechanism for nuclear power plants according to claim 2, characterized in that: The valve operating mechanism for the nuclear power plant also includes an adapter and a first fixed bracket. One end of the first fixed bracket is mounted on a wall, and the other end of the first fixed bracket is provided with a first mounting hole. The first end of the flexible connecting shaft is rotatably mounted in the first mounting hole. One end of the adapter is fixedly connected to the first end of the flexible connecting shaft, and the chuck is slidably mounted on the other end of the adapter in the vertical direction.

4. The valve operating mechanism for nuclear power plants according to claim 3, characterized in that: The valve operating mechanism for the nuclear power plant also includes a pull rope bearing, the chuck is rotatably fitted inside the pull rope bearing, the pull rope bearing has a rope hole, and the operating pull rope is connected to the rope hole.

5. The valve operating mechanism for nuclear power plants according to claim 3, characterized in that: The valve operating mechanism for the nuclear power plant also includes a first position block and a second position block, which are fixedly installed on the wall at intervals. The first position block has a first position hole, and the second position block has a second position hole. The end of the operating rope can be selectively connected to either the first position hole or the second position hole.

6. The valve operating mechanism for nuclear power plants according to claim 1, characterized in that: The chuck has a slot that detachably nests the handwheel of the valve.

7. The valve operating mechanism for nuclear power plants according to claim 6, characterized in that: The chuck includes a base plate and two chuck plates spaced apart on the base plate, with the gap between the two chuck plates forming the chuck slot.

8. The valve operating mechanism for nuclear power plants according to claim 7, characterized in that: A magnetic block is installed on the outer wall of the card plate, and the magnetic block is used to attract the handwheel of the valve to the groove wall of the card slot.

9. The valve operating mechanism for nuclear power plants according to claim 1, characterized in that: The valve operating mechanism for the nuclear power plant also includes a multiplier, and the first end of the flexible connecting shaft is connected to the chuck through the multiplier.

10. The valve operating mechanism for a nuclear power plant according to any one of claims 1 to 9, characterized in that: The valve operating mechanism for the nuclear power plant also includes a second fixed bracket, one end of which is fixed to a wall, and the other end of which has a second mounting hole. The middle part of the flexible connecting shaft is rotatably mounted in the second mounting hole.

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