A water level detecting device for a hydropower station

Abstract

The application belongs to the technical field of water level detection equipment, and particularly relates to a water level detection device for a hydropower station, which comprises a float and a measuring pipe, the measuring pipe is a straight pipe with a scale marked on the surface, the float is an annular structure, and the float is sleeved on the measuring pipe; the device further comprises a precise reading mechanism, the precise reading mechanism is installed on the measuring pipe, and the precise reading mechanism is used for accurately reading the position of the float; the device is provided with the measuring pipe and the float, and the precise reading mechanism is used in cooperation, when the water level detection device is laid, the precise reading mechanism is located in the measuring pipe, the inner cavity of the measuring pipe is separated from the external water body, therefore, the degree of influence of the external environment on the precise reading mechanism is effectively reduced, the change of the water level can be detected in real time, and the convenience of water level detection is enhanced.

Description

TECHNICAL FIELD

[0001] The application belongs to the technical field of water level detection equipment, and in particular to a water level detection device for a hydropower station. BACKGROUND

[0002] A hydropower station is composed of a water system, a mechanical system, and a power generation device, and is a water conservancy hub project for realizing the conversion of water energy into electric energy. When the hydropower station is in normal use, the water levels of the upstream and downstream of the hydropower station need to be monitored. In the climate environment of the rainy season or excessive rainfall, the water levels of the upstream and downstream of the hydropower station need to be accurately monitored so as to control the water levels of the upstream and downstream of the hydropower station and maintain the normal operation of the hydropower station.

[0003] The conventional water level detection method in the hydropower station is to periodically go to the measurement site by the staff to obtain the water level information by using a water level rod. This original measurement method not only has low detection efficiency and poor detection accuracy, but also requires the staff to frequently move, thereby increasing the labor of the staff. In order to enhance the convenience of water level detection, a water level sensor is usually applied and configured in the hydropower station. The water level sensor is arranged at intervals to monitor the specific height of the water level, and then automatically obtain the water level data. However, due to the influence of the underwater environment, the water level sensor directly contacted with the water environment for a long time is prone to damage and failure.

[0004] Therefore, in order to improve the convenience of water level detection, a variety of water level detection technologies without contact with the water environment are disclosed in the related art. For example, a floating type water level alarm device for a hydropower station is disclosed in the related art, and the announcement number is CN111693117B. In this scheme, a plurality of water level alarm switches arranged in the water level depth direction are provided, and a swing rod mechanism and a floating mechanism are matched. The switch action of the water level alarm switch is completed by using a mechanical linkage structure, thereby realizing that the water level alarm switch can effectively avoid direct contact with the water body, so that the water level alarm switch is less affected by the water environment. However, it is found in actual application that, on the one hand, when the sealed chamber is arranged underwater and the plurality of water level alarm switches are installed at intervals underwater, the installation and maintenance of the water level alarm switch are both troublesome, and the sealing property of the sealed chamber is challenged in a long time use. On the other hand, the swing rod mechanism is used to realize the transmission of the floating mechanism and the water level alarm switch. In a long time use, since the swing rod mechanism is directly contacted with the water, rust and other problems are prone to occur, thereby affecting the transmission stability and further affecting the normal use of the device.

[0005] In view of this, the application provides a water level detection device for a hydropower station to solve the above technical problems. SUMMARY

[0006] In order to make up for the deficiencies of the prior art and solve the above technical problems, the application provides a water level detection device for a hydropower station.

[0007] The technical scheme adopted by the present application to solve its technical problems is: the water level detection device for a hydropower station, comprising a float and a measuring pipe, the measuring pipe is a straight pipe with a scale marked on the surface, the float is an annular structure, and the float is sleeved on the measuring pipe;

[0008] It also includes a precise reading mechanism, which is installed on the measuring pipe, and the precise reading mechanism is used for accurately reading the position of the float;

[0009] The precise reading mechanism includes a moving part, a transmission cable, a pulley block and a displacement sensor;

[0010] The measuring pipe is a tubular structure with an open top end and a closed bottom end, the measuring pipe is provided with a mounting plate at the top end, and the mounting plate is detachably provided with a pulley block at the bottom;

[0011] The moving part is slidingly installed inside the measuring pipe, the moving part and the float are jointly provided with a transmission cable, the middle part of the transmission cable extends to the pulley block, and the weight of the float is greater than that of the moving part;

[0012] The displacement sensor is installed inside the measuring pipe, and the displacement sensor is used for detecting the displacement of the moving part.

[0013] Preferably, the precise reading mechanism further comprises a magnetic attraction part, the magnetic attraction part is slidingly installed in the measuring pipe, the float and the magnetic attraction part are magnetically attracted, and the number of displacement sensors is two, and the two displacement sensors are respectively used for detecting the displacement of the moving part and the magnetic attraction part.

[0014] Preferably, the float comprises a sleeve ring, a connecting belt and a floating plate;

[0015] The sleeve ring is a tubular structure, the sleeve ring is sleeved outside the measuring pipe, the transmission cable is fixedly connected with the sleeve ring, and the floating plate is sleeved on the sleeve ring;

[0016] The connecting belt is fixedly installed on the floating plate, and one end of the connecting belt away from the floating plate is connected with the sleeve ring.

[0017] Preferably, the sleeve ring is internally provided with a winding cavity, a winding shaft is rotatably installed in the winding cavity, the connecting belt is fixedly connected with the winding shaft, a winding spring is fixedly installed in the winding cavity, and the winding spring is fixedly connected with the winding shaft.

[0018] Preferably, the inside of the sleeve ring is provided with an elastic groove, a friction rod is elastically installed in the elastic groove through a spring, the top end of the friction rod abuts against the measuring pipe, and a pull rope is fixedly installed on the friction rod, the pull rope extends into the winding cavity and is fixedly connected with the winding shaft.

[0019] Preferably, the pull ropes are divided into multiple groups, and the lengths of the multiple groups of pull ropes are different.

[0020] Preferably, the end of the friction rod is in sliding sealing connection with the elastic groove, a flow limiting tube is arranged in the elastic groove, and the flow limiting tube extends to the outside of the sleeve ring.

[0021] Preferably, the device further comprises a calibration mechanism, which is arranged on the measuring tube and is used for correcting the accuracy of the device.

[0022] The calibration mechanism comprises a counterweight chain, a winding wheel, a suction ring and a rotating motor.

[0023] The rotating motor is arranged on the mounting plate, the winding wheel is fixedly arranged at the output end of the rotating motor, the counterweight chain is fixedly arranged on the winding wheel, the suction ring is fixedly arranged at the end of the counterweight chain away from the winding wheel, the suction ring is made of a permanent magnet, and the suction ring is arranged on the measuring tube.

[0024] Preferably, the measuring tube is fixedly provided with a limiting boss between the two displacement sensors, and the limiting boss is used for limiting the movement paths of the suction ring, the magnetic suction element and the moving element.

[0025] The device has the following beneficial effects:

[0026] 1. The water level detection device for a hydropower station has the advantages that the measuring tube and the float are arranged, and the accurate reading mechanism is used in cooperation, when the water level detection device is laid, the accurate reading mechanism is arranged in the measuring tube, and the inner cavity of the measuring tube is separated from the external water body, so that the influence of the external environment on the accurate reading mechanism is effectively reduced, the change of the water level can be detected in real time, and the convenience of water level detection is enhanced.

[0027] 2. The water level detection device for a hydropower station has the advantages that the two displacement sensors are arranged and are respectively used for measuring the displacement of the moving element and the magnetic suction element, and then the water level data are calculated, in actual application, the two water level acquisition modes are used in cooperation, and the water level data acquisition accuracy can be effectively enhanced. BRIEF DESCRIPTION OF DRAWINGS

[0028] The application will be further described below with reference to the drawings.

[0029] Figure 1 is a perspective view of the application;

[0030] Figure 2 is a perspective view of the calibration mechanism of the application;

[0031] Figure 3 is a connection schematic view of the float and the moving element;

[0032] Figure 4 isFigure 3 A local enlarged view at the middle A;

[0033] Figure 5 is a sectional view of the present application;

[0034] Figure 6 is Figure 5 A local enlarged view at the middle B;

[0035] Figure 7 is a sectional view of the float;

[0036] In the figure: 1, float; 11, collar; 12, connecting belt; 13, floating plate; 2, measuring tube; 21, moving part; 22, transmission cable; 23, pulley block; 24, displacement sensor; 25, mounting plate; 26, magnetic attraction part; 4, winding cavity; 41, winding shaft; 42, coil spring; 43, elastic groove; 44, friction rod; 45, pull rope; 46, flow limiting tube; 5, counterweight chain; 51, winding wheel; 52, adsorption ring; 53, rotary motor; 54, limiting boss. DETAILED DESCRIPTION

[0037] In order to make the technical means, creative features, purposes and effects of the present application easy to understand, the present application is further described below in combination with specific embodiments.

[0038] As Figures 1 to 7 shown, the water level detection device for a hydropower station provided by the present application comprises a float 1 and a measuring tube 2, the measuring tube 2 is a straight tube with a scale marked on the surface, the float 1 is an annular structure, and the float 1 is sleeved on the measuring tube 2. In the present application, the overall density of the float 1 is less than the density of water, so the float 1 always floats on the water surface.

[0039] It also comprises a precise reading mechanism, the precise reading mechanism is installed on the measuring tube 2, the precise reading mechanism is used for accurately reading the position of the float 1, the precise reading mechanism comprises a moving part 21, a transmission cable 22, a pulley block 23 and a displacement sensor 24, the measuring tube 2 is a tubular structure with an open top end and a closed bottom end, a mounting plate 25 is installed at the top end of the measuring tube 2, the pulley block 23 is detachably installed at the bottom of the mounting plate 25, the moving part 21 is slidingly installed inside the measuring tube 2, the transmission cable 22 is jointly installed on the float 1, the middle part of the transmission cable 22 extends to the pulley block 23, the weight of the float 1 is greater than the weight of the moving part 21, and the displacement sensor 24 is installed inside the measuring tube 2, the displacement sensor 24 is used for detecting the displacement of the moving part 21.

[0040] When the water level of the upstream and downstream of the hydropower station is detected, the detection equipment is installed on the detection position selected in advance on the upstream and downstream of the hydropower station to realize the continuous monitoring of the water level. When monitoring, the float 1 floats on the water surface and rises and falls with the water surface. Since the measuring column is marked with a scale, the current corresponding water level height can be read according to the change of the relative position of the float 1 and the measuring column. In order to further enhance the accurate reading of the water level height, the accurate reading mechanism is also provided in the application. The water level height is read in real time through the rising and falling of the float 1 position.

[0041] Specifically, in the application, the float 1 is connected with the moving piece 21 through the transmission cable 22. Under the action of the pulley block 23, the float 1 and the moving piece 21 are linked. In the application, the weight of the float 1 is greater than the weight of the moving piece 21, and the buoyancy of the float 1 is greater than the weight of the float 1. Therefore, when the height of the float 1 changes with the water level height, the moving piece 21 connected with the float 1 through the transmission cable 22 moves synchronously. Since the moving piece 21 is slidingly installed inside the measuring pipe 2, the moving piece 21 cooperates with the displacement sensor 24. In this embodiment, the displacement sensor 24 is selected as a resistance displacement sensor 24. The displacement sensor 24 is composed of a variable resistance slide rail and a slide piece. The slide piece is fixedly connected with the moving piece 21. Therefore, when the moving piece 21 moves, the position of the slide piece on the variable resistance slide rail changes synchronously, causing the resistance value measured by the displacement sensor 24 to change, thereby measuring the displacement of the moving piece 21. The output value after measurement is transmitted to the receiving device designated by the worker under the assistance of the preset data transmission program, so that the water level can be monitored in real time. In other embodiments of the application, other linear displacement sensors 24 can also be selected to detect the displacement of the moving piece 21, thereby realizing accurate detection of the water level.

[0042] It should be noted that the pulley block 23 is combined with the transmission cable 22. On the one hand, the path and arrangement of the transmission cable 22 are changed by the pulley block 23, thereby adjusting the moving distance ratio of the float 1 and the moving piece 21. In this embodiment, three pulleys are arranged in the pulley block 23. The transmission cable 22 extends from the moving piece 21 to the first pulley, then extends to the moving piece 21, and then extends to the second and third pulleys, and finally connects with the float 1. Therefore, during actual transmission, the moving distance of the moving piece 21 is only one third of the moving distance of the float 1 during the rising and falling movement of the float 1. In other embodiments of the application, the worker can adjust the number of pulleys in the pulley block 23 to adjust the moving distance ratio of the moving piece 21 and the float 1.

[0043] The application sets the measuring pipe 2 and the float 1, and the accurate reading mechanism used in cooperation, when the water level detection device is laid out, the accurate reading mechanism is located in the measuring pipe 2, and the inner cavity of the measuring pipe 2 is separated from the external water body, so that the degree of influence of the accurate reading mechanism by the external environment is effectively reduced, and the water level change can be detected in real time, and the convenience of water level detection is enhanced.

[0044] As a preferred embodiment of the application, the accurate reading mechanism further comprises a magnetic attraction piece 26, the magnetic attraction piece 26 is slidingly installed in the measuring pipe 2, the float 1 is magnetically attracted to the magnetic attraction piece 26, and the displacement sensor 24 is two in number, and the two displacement sensors 24 are respectively used for detecting the displacement of the moving piece 21 and the magnetic attraction piece 26.

[0045] In the process of continuous water level detection, the float 1 follows the continuous change of the liquid level height, and in the process of lifting of the float 1, since the float 1 is always sleeved on the measuring pipe 2, and the float 1 is magnetically attracted to the magnetic attraction piece 26 in the measuring pipe 2, in this embodiment, the magnetic attraction piece 26 is made of a permanent magnet, and a part of the float 1 close to the measuring pipe 2 is made of a ferromagnetic material, in other embodiments of the application, a part of the float 1 close to the measuring pipe 2 can also be made of a permanent magnet, and in actual application, the float 1 and the magnetic attraction piece 26 attract each other through the measuring pipe 2, so that when the float 1 rises and falls along with the liquid level, the magnetic attraction piece 26 is simultaneously driven to rise and fall, and one of the displacement sensors 24 installed in the measuring pipe 2 cooperates with the magnetic attraction piece 26, so that the slide in the displacement sensor 24 moves synchronously in the process of movement of the magnetic attraction piece 26, and the resistance of the displacement sensor 24 changes, and then the current water level data is judged in real time through the change of the value of the displacement sensor 24.

[0046] The application sets two displacement sensors 24, which are respectively used for measuring the displacement of the moving piece 21 and the magnetic attraction piece 26, and then calculating the water level data, and in actual application, the two water level acquisition modes are used in cooperation, so that the water level data acquisition accuracy can be effectively enhanced.

[0047] As a preferred embodiment of the application, the float 1 comprises a sleeve ring 11, a connecting belt 12 and a floating plate 13.

[0048] The sleeve ring 11 is a tubular structure, the sleeve ring 11 is sleeved outside the measuring pipe 2, the transmission cable 22 is fixedly connected with the sleeve ring 11, and the floating plate 13 is sleeved on the sleeve ring 11.

[0049] The connecting belt 12 is fixedly installed on the floating plate 13, and one end of the connecting belt 12 away from the floating plate 13 is connected with the sleeve ring 11.

[0050] In the water level measurement process, the water surface height is affected by the surrounding environment and fluctuates, such as the existence of airflow and other environmental factors, so that the float 1 also fluctuates. In order to reduce the frequent changes of the displacement sensor 24 driven by the moving part 21, the float 1 is divided into a sleeve ring 11, a connecting belt 12 and a floating plate 13. The sleeve ring 11 is sleeved on the measuring pipe 2, the floating plate 13 floats on the liquid surface, and the connecting belt 12 is located between the floating plate 13 and the sleeve ring 11. Therefore, when the water level changes, the floating plate 13 moves first. When the distance between the floating plate 13 and the sleeve ring 11 is greater than the length of the connecting belt 12, the floating plate 13 drags the sleeve ring 11 to rise and fall. Therefore, when the water level is relatively stable and the water surface fluctuates slightly, the floating plate 13 fluctuates frequently. When the fluctuation range of the floating plate 13 is within the length of the connecting belt 12, the fluctuation range of the sleeve ring 11 is small and the fluctuation frequency is reduced. Therefore, the measured water level data is relatively stable.

[0051] As a preferred embodiment of the present application, the sleeve ring 11 is internally provided with a winding cavity 4, the winding cavity 4 is internally rotatably provided with a winding shaft 41, the connecting belt 12 is fixedly connected with the winding shaft 41, and the winding cavity 4 is internally fixedly provided with a winding spring 42, and the winding spring 42 is fixedly connected with the winding shaft 41.

[0052] In actual application, the winding cavity 4 is internally provided with the winding shaft 41, and the connecting belt 12 is fixedly connected with the winding shaft 41 in the winding cavity 4. In the initial state, the connecting belt 12 is wound on the winding shaft 41. When the floating plate 13 rises and falls with the liquid surface, the floating plate 13 pulls the connecting belt 12 to gradually expand. In the process of gradually expanding the connecting belt 12, the deformation degree of the winding spring 42 gradually increases. When the liquid surface is stable, the winding spring 42 restores the deformation, so that the winding shaft 41 reversely rotates, and then the connecting belt 12 is wound, so that the sleeve ring 11 gradually aligns with the floating plate 13, and the measured data is consistent with the water level data.

[0053] As a preferred embodiment of the present application, the sleeve ring 11 is internally provided with an elastic groove 43, the elastic groove 43 is internally provided with a friction rod 44 elastically mounted by a spring, the top end of the friction rod 44 abuts against the measuring pipe 2, the friction rod 44 is fixedly provided with a pull rope 45, and the pull rope 45 extends into the winding cavity 4 and is fixedly connected with the winding shaft 41.

[0054] The pull rope 45 is divided into multiple groups, and the lengths of the multiple groups of pull ropes 45 are different.

[0055] When the water level height changes, the floating plate 13 follows the water level to rise and fall, and the water level pulls the connecting belt 12 to gradually expand, thereby causing the winding shaft 41 to rotate. With the continuous rotation of the winding shaft 41, the winding shaft 41 winds the pull rope 45, thereby causing the pull rope 45 to pull the friction rod 44, so that the friction rod 44 is retracted into the elastic groove 43. Since the lengths of the plurality of pull ropes 45 are different, the plurality of friction rods 44 are retracted one by one. In actual application, when the floating plate 13 is flush with the sleeve ring 11, the friction rods 44 on the sleeve ring 11 are all in abutment with the measuring tube 2. At this time, the friction resistance of the sleeve ring 11 moving on the measuring tube 2 is the largest. With the gradual increase of the distance between the floating plate 13 and the sleeve ring 11, the friction rods 44 are retracted one by one, causing the friction resistance of the sleeve ring 11 moving on the measuring tube 2 to gradually decrease. Therefore, when the water level changes within a small range, the moving speed of the sleeve ring 11 is relatively slow. When the water level changes within a large range, the moving speed of the sleeve ring 11 is relatively fast. Therefore, when the water surface is fluctuating, the frequency of the sleeve ring 11 rising and falling can be reduced, thereby enhancing the stability of water level data measurement.

[0056] As a preferred embodiment of the present application, the end of the friction rod 44 is in sliding sealing connection with the elastic groove 43, and a flow limiting tube 46 is installed in the elastic groove 43, and the flow limiting tube 46 extends to the outside of the sleeve ring 11.

[0057] The flow limiting tube 46 is used to communicate the elastic groove 43 with the outside, so that water flows into the elastic groove 43. When the friction rod 44 moves into the elastic groove 43, the water flows out of the elastic groove 43 under the action of pressure through the flow limiting tube 46. Since the diameter of the flow limiting tube 46 is fixed, the outflow rate of the water is limited, so that the disengagement rate of the friction rod 44 from the measuring tube 2 is limited. In actual application, the difficulty of the sleeve ring 11 moving is reduced at a limited rate. When the floating plate 13 rises and falls due to the fluctuation of the water surface, the interval between the rising and falling is short, so that the difficulty of the sleeve ring 11 moving has not been reduced, and the water surface has already changed, further reducing the probability of the sleeve ring 11 rising and falling frequently due to the fluctuation of the water surface.

[0058] As a preferred embodiment of the present application, a verification mechanism is further included, which is installed on the measuring tube 2 and is used to correct the equipment accuracy.

[0059] The verification mechanism includes a counterweight chain 5, a winding wheel 51, a suction ring 52 and a rotary motor 53.

[0060] The mounting plate 25 is provided with the rotary motor 53, the output end of the rotary motor 53 is fixedly provided with the winding wheel 51, the winding wheel 51 is fixedly provided with the counterweight chain 5, and the end of the counterweight chain 5 away from the winding wheel 51 is fixedly provided with the suction ring 52. The suction ring 52 is made of a permanent magnet and is sleeved on the measuring tube 2.

[0061] The measuring tube 2 is fixedly installed between two displacement sensors 24 with a limiting boss 54 for limiting the movement path of the adsorption ring 52, the magnetic adsorption piece 26 and the moving piece 21.

[0062] During long-time use of the water level detection device, the position of the float 1, the adsorption ring 52, the magnetic adsorption piece 26 and the moving piece 21 can be checked regularly by setting a checking mechanism, thereby reducing the failure probability of the device. Specifically, during checking, the rotary motor 53 is started to drive the winding wheel 51 to rotate, and the counterweight chain 5 wound on the winding wheel 51 gradually unwinds, and the adsorption ring 52 fixedly connected to the bottom end of the counterweight chain 5 falls along the measuring tube 2 downward until the adsorption ring 52 falls on the float 1, and as the counterweight chain 5 gradually unwinds, the weight of the counterweight chain 5 falling on the float 1 gradually increases. When the combined force of the counterweight chain 5, the adsorption ring 52 and the float 1 is greater than the buoyancy of the float 1, the float 1 moves downward, thereby driving the moving piece 21 and the magnetic adsorption piece 26 to move synchronously. When the float 1 moves to the maximum measurement position at the bottom end of the measuring tube 2, the rotary motor 53 is reversely rotated under the control of the pre-set program, the counterweight chain 5 is gradually wound on the winding wheel 51, and as the adsorption ring 52 is magnetically adsorbed to the float 1, the float 1 is separated from the water surface during the upward movement of the adsorption ring 52. When the adsorption ring 52 and the float 1 move to the limiting boss 54, the adsorption ring 52 and the float 1 are separated under the interception of the limiting boss 54, and the float 1 falls again on the water surface under the action of gravity. Through periodic checking, the float 1 can be prevented from being stuck and fixed on the measuring tube 2, and the float 1 can be repositioned on the water surface, thereby effectively enhancing the accuracy of water level detection and reducing the failure probability of the device.

[0063] The basic principles, main features and advantages of the present application are shown and described above. It should be understood by those skilled in the art that the present application is not limited by the above examples, and the above examples and descriptions in the specification are only to illustrate the principles of the present application. Without departing from the spirit and scope of the present application, various changes and improvements can be made to the present application, and these changes and improvements all fall within the scope of the claimed present application. The scope of protection of the present application is defined by the appended claims and their equivalents.

Claims

1. A water level detection device for a hydropower station, comprising a float (1) and a measuring tube (2), the measuring tube (2) being a straight tube with a scale marked on the surface, the float (1) being an annular structure, the float (1) being sleeved on the measuring tube (2); characterized in that It also comprises a precision reading mechanism, which is installed on the measuring tube (2), and is used for accurately reading the position of the float (1); The precision reading mechanism comprises a moving part (21), a transmission cable (22), a pulley block (23) and a displacement sensor (24); The measuring tube (2) is a tubular structure with an open top end and a closed bottom end, an installation plate (25) is installed at the top end of the measuring tube (2), and the pulley block (23) is detachably installed at the bottom of the installation plate (25); The moving part (21) is slidingly installed inside the measuring tube (2), the transmission cable (22) is jointly installed on the float (1), the middle part of the transmission cable (22) extends to the pulley block (23), and the weight of the float (1) is greater than that of the moving part (21); The displacement sensor (24) is installed inside the measuring tube (2), and is used for detecting the displacement of the moving part (21).

2. The water level detection device for a hydropower station according to claim 1, characterized in that: The precision reading mechanism further comprises a magnetic attraction part (26), which is slidingly installed in the measuring tube (2), the float (1) and the magnetic attraction part (26) are magnetically attracted to each other, and the displacement sensor (24) is provided in two, and the two displacement sensors (24) are respectively used for detecting the displacement of the moving part (21) and the magnetic attraction part (26).

3. A water level detection device for a hydroelectric power station according to claim 2, characterized in that: The float (1) comprises a sleeve ring (11), a connecting belt (12) and a floating plate (13); The sleeve ring (11) is a tubular structure, the sleeve ring (11) is sleeved outside the measuring tube (2), the transmission cable (22) is fixedly connected with the sleeve ring (11), and the floating plate (13) is sleeved on the sleeve ring (11); The connecting belt (12) is fixedly installed on the floating plate (13), and one end of the connecting belt (12) away from the floating plate (13) is connected with the sleeve ring (11).

4. A water level detection device for a hydroelectric power station according to claim 3, characterized in that: A winding cavity (4) is formed in the inside of the sleeve ring (11), a winding shaft (41) is rotatably installed in the winding cavity (4), the connecting belt (12) is fixedly connected with the winding shaft (41), a winding spring (42) is fixedly installed in the winding cavity (4), and the winding spring (42) is fixedly connected with the winding shaft (41).

5. A water level detection device for a hydroelectric power station according to claim 4, characterized in that: An elastic groove (43) is formed in the inside of the sleeve ring (11), a friction rod (44) is elastically installed in the elastic groove (43) through a spring, the top end of the friction rod (44) abuts against the measuring tube (2), and a pull rope (45) is fixedly installed on the friction rod (44), the pull rope (45) extends into the winding cavity (4) and is fixedly connected with the winding shaft (41).

6. A water level detection device for a hydroelectric power station according to claim 5, wherein: The pull rope (45) is divided into multiple groups, and the lengths of the pull ropes (45) in the multiple groups are different.

7. A water level detection device for a hydroelectric power station as claimed in claim 6, wherein: The end of the friction rod (44) is slidingly and sealingly connected with the elastic groove (43), a flow limiting tube (46) is installed in the elastic groove (43), and the flow limiting tube (46) extends to the outside of the sleeve ring (11).

8. The water level detection device for a hydropower station according to claim 2 or 7, characterized in that: Also include a check mechanism, the check mechanism is installed on the measuring tube (2), the check mechanism is used for correcting equipment precision; The check mechanism includes a counterweight chain (5), a winding wheel (51), a suction ring (52) and a rotary motor (53); The mounting plate (25) is provided with a rotary motor (53), and the output end of the rotary motor (53) is fixedly provided with a winding wheel (51), the winding wheel (51) is fixedly provided with a counterweight chain (5), one end of the counterweight chain (5) away from the winding wheel (51) is fixedly provided with a suction ring (52), the suction ring (52) is made of permanent magnet, and the suction ring (52) is sleeved on the measuring tube (2).

9. A water level detection device for a hydroelectric power station according to claim 8, characterised in that: The measuring tube (2) is fixedly provided with a limiting boss (54) between the two displacement sensors (24), and the limiting boss (54) is used for limiting the movement path of the suction ring (52), the magnetic attraction element (26) and the moving element (21).

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