CN117109700A - Hydropower station water level monitoring alarm device - Google Patents

Hydropower station water level monitoring alarm device Download PDF

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Publication number
CN117109700A
CN117109700A CN202311371067.1A CN202311371067A CN117109700A CN 117109700 A CN117109700 A CN 117109700A CN 202311371067 A CN202311371067 A CN 202311371067A CN 117109700 A CN117109700 A CN 117109700A
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China
Prior art keywords
disc
water level
wall
hydropower station
arranged outside
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Granted
Application number
CN202311371067.1A
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Chinese (zh)
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CN117109700B (en
Inventor
张官祥
张舸
程建
李利华
杨廷勇
杨欲景
马明叶
王永伟
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Three Gorges Jinsha River Yunchuan Hydropower Development Co ltd
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Three Gorges Jinsha River Yunchuan Hydropower Development Co ltd
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Priority to CN202311371067.1A priority Critical patent/CN117109700B/en
Publication of CN117109700A publication Critical patent/CN117109700A/en
Application granted granted Critical
Publication of CN117109700B publication Critical patent/CN117109700B/en
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    • GPHYSICS
    • G01MEASURING; TESTING
    • G01FMEASURING VOLUME, VOLUME FLOW, MASS FLOW OR LIQUID LEVEL; METERING BY VOLUME
    • G01F23/00Indicating or measuring liquid level or level of fluent solid material, e.g. indicating in terms of volume or indicating by means of an alarm
    • G01F23/30Indicating or measuring liquid level or level of fluent solid material, e.g. indicating in terms of volume or indicating by means of an alarm by floats
    • G01F23/32Indicating or measuring liquid level or level of fluent solid material, e.g. indicating in terms of volume or indicating by means of an alarm by floats using rotatable arms or other pivotable transmission elements
    • G01F23/34Indicating or measuring liquid level or level of fluent solid material, e.g. indicating in terms of volume or indicating by means of an alarm by floats using rotatable arms or other pivotable transmission elements using mechanically actuated indicating means

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  • Physics & Mathematics (AREA)
  • Fluid Mechanics (AREA)
  • General Physics & Mathematics (AREA)
  • Emergency Alarm Devices (AREA)

Abstract

The application relates to the technical field of water level monitoring, in particular to a hydropower station water level monitoring alarm device. The energy storage assembly comprises a solar panel, a monitoring camera arranged outside the solar panel and a distribution box arranged outside the solar panel; the conduction assembly comprises a floating block arranged outside the solar panel and a transmission rod arranged outside the floating block; the correction assembly comprises an outer disc arranged outside the transmission rod, an outer chuck movably arranged in the outer disc, an inner disc movably arranged in the outer disc and an inner chuck arranged on the outer wall of the inner disc; and the prompting component comprises a knocking block arranged outside the inner disc and a sounding disc arranged outside the knocking block, when the water level of the hydropower station rises, the position of the floating block generates height change in the river channel so that the rotating shaft rotates, thereby the knocking block knocks the sounding disc, and sounds are generated to provide water level early warning information for the staff of the hydropower station.

Description

Hydropower station water level monitoring alarm device
Technical Field
The application relates to the technical field of water level monitoring, in particular to a hydropower station water level monitoring alarm device.
Background
In the operation process of a hydropower station, accurate water level monitoring and control are important tasks for ensuring safe operation of the hydropower station. Currently, hydropower station water level monitoring is generally performed by conventional manual inspection or using a water level monitoring device. However, the method has the problems of inaccurate monitoring, untimely early warning and the like, and cannot meet the requirement of safe operation of a hydropower plant.
Disclosure of Invention
The application is provided in view of the problems of inaccurate water level monitoring and untimely early warning in the prior art.
Therefore, the application aims to provide a hydropower station water level monitoring and alarming device.
In order to solve the technical problems, the application provides the following technical scheme: the energy storage assembly comprises a solar panel, a monitoring camera arranged outside the solar panel and electrically connected with the solar panel, and a distribution box arranged outside the solar panel and electrically connected with the solar panel; the conduction assembly comprises a floating block which is arranged outside the solar panel and is movably connected with the outer wall of the river levee, and a transmission rod which is movably arranged outside the floating block; the correction assembly comprises an outer disc arranged outside the transmission rod, an outer chuck movably arranged in the outer disc, an inner disc movably arranged on the inner wall of the outer disc and an inner chuck arranged on the outer wall of the inner disc; and the prompting component comprises a part knocking block arranged outside the inner disc and a sound emitting disc arranged outside the knocking block.
As a preferable scheme of the hydropower station water level monitoring and alarming device, the application comprises the following steps: the distribution box is electrically connected with a motor through a wire, an output shaft is arranged inside the motor, the output shaft is connected with an input shaft through bevel gear meshing, and a rotating shaft is movably arranged outside the input shaft.
As a preferable scheme of the hydropower station water level monitoring and alarming device, the application comprises the following steps: one end of the transmission rod is movably connected with the outer wall of the rotating shaft, the other end of the transmission rod is movably connected with a first hydraulic cylinder, one end of a pipeline is connected in the first hydraulic cylinder, the other end of the pipeline is connected with a second hydraulic cylinder, and the second hydraulic cylinder is fixedly connected with the floating block.
As a preferable scheme of the hydropower station water level monitoring and alarming device, the application comprises the following steps: the input shaft outer wall is provided with the spread groove, the input shaft with outer dish movable connection, be provided with in the outer dish with spread groove clearance fit's connecting block, outer dish outer wall is provided with first draw-in groove.
As a preferable scheme of the hydropower station water level monitoring and alarming device, the application comprises the following steps: the outer disc is movably connected with the outer disc, a first clamping block is arranged on the outer wall of the outer disc, the first clamping block is movably matched with the first clamping groove, and a first friction plate is arranged on the end face of the outer disc.
As a preferable scheme of the hydropower station water level monitoring and alarming device, the application comprises the following steps: the inner clamping disc inner wall is provided with a second clamping block, and the outer wall of the inner clamping disc is provided with a second friction plate.
As a preferable scheme of the hydropower station water level monitoring and alarming device, the application comprises the following steps: the outer wall of the inner disc is provided with a second clamping groove, and the second clamping groove is movably matched with the second clamping block.
As a preferable scheme of the hydropower station water level monitoring and alarming device, the application comprises the following steps: the inner disc is internally provided with a first sleeve, and a first spring is arranged in the first sleeve.
As a preferable scheme of the hydropower station water level monitoring and alarming device, the application comprises the following steps: the inner disc outer wall activity is provided with pushes away a section of thick bamboo, be provided with the second sleeve in pushing away the section of thick bamboo, the second sleeve with first sleeve sliding fit, it is provided with the lug to push away a section of thick bamboo inner wall, the lug can with second draw-in groove clearance fit, push away a section of thick bamboo with axis of rotation joint.
As a preferable scheme of the hydropower station water level monitoring and alarming device, the application comprises the following steps: the rotary shaft outer wall joint has the commentaries on classics handle, be provided with diamond-shaped lug in the commentaries on classics handle, change handle swing joint in the sounding disc inner wall, the spiro union has the supporting disk in the sounding disc, the supporting disk terminal surface is provided with the second spring, the second spring with strike piece fixed connection.
The hydropower station water level monitoring and alarming device has the beneficial effects that: according to the application, the floating blocks are arranged, when the water level of the hydropower station rises, the positions of the floating blocks generate height change in the river channel so that the rotating shaft rotates, and therefore the knocking blocks knock the sounding disc to generate sound so as to provide water level early warning information for hydropower station staff.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings required for the description of the embodiments will be briefly described below, it being obvious that the drawings in the following description are only some embodiments of the present application, and that other drawings may be obtained according to these drawings without inventive effort for a person skilled in the art. Wherein:
FIG. 1 is an overall schematic diagram of a hydropower station water level monitoring alarm device.
FIG. 2 is a schematic diagram of the internal structure of the conduction assembly of the hydropower station water level monitoring and alarming device.
FIG. 3 is an enlarged schematic diagram of a part of the structure of a conduction assembly of the hydropower station water level monitoring and alarming device.
FIG. 4 is an enlarged schematic view of another part of the structure of the conduction assembly of the hydropower station water level monitoring and alarming device.
FIG. 5 is a schematic cross-sectional view of the internal structure of the hydropower station water level monitoring and alarming device.
FIG. 6 is an exploded view of the correction assembly of the hydropower station water level monitoring alarm device.
FIG. 7 is an enlarged view of a part of the structure of the hydropower station water level monitoring alarm device.
Fig. 8 is a cross-sectional view of a cue assembly.
In the figure: 100. an energy storage assembly; 101. a solar panel; 102. monitoring a camera; 103. a distribution box; 104. a motor; 104a, an output shaft; 104b, an input shaft; 104c, rotating shaft; 104b-1, a connecting groove; 200. a conductive component; 201. a floating block; 205. a transmission rod; 204. a first hydraulic cylinder; 203. a pipe; 202. a second hydraulic cylinder; 300. a correction component; 301. an outer disk; 302. an outer chuck; 303. an inner chuck; 304. an inner disk; 301a, connecting blocks; 302a, a first clamping block; 301b, a first clamping groove; 305. a first friction plate; 303a, a second clamping block; 303b, a second friction plate; 304a, a second clamping groove; 306. a first sleeve; 307. a first spring; 308. pushing a cylinder; 308a, a second sleeve; 400. a prompting component; 401. knocking the block; 402. a sound emitting disc; 403. a rotating handle; 403a, diamond-shaped bumps; 404. a support plate; 401a, a second spring.
Detailed Description
In order that the above-recited objects, features and advantages of the present application will become more readily apparent, a more particular description of the application will be rendered by reference to specific embodiments thereof which are illustrated in the appended drawings.
In the following description, numerous specific details are set forth in order to provide a thorough understanding of the present application, but the present application may be practiced in other ways other than those described herein, and persons skilled in the art will readily appreciate that the present application is not limited to the specific embodiments disclosed below.
Further, reference herein to "one embodiment" or "an embodiment" means that a particular feature, structure, or characteristic can be included in at least one implementation of the application. The appearances of the phrase "in one embodiment" in various places in the specification are not necessarily all referring to the same embodiment, nor are separate or alternative embodiments mutually exclusive of other embodiments.
Example 1
Referring to fig. 1 to 6, a first embodiment of the present application provides a hydropower station water level monitoring and alarming device, and the conduction assembly 200 can transmit information to the correction assembly 300 when the water level rises.
Specifically, the energy storage assembly 100 includes a solar panel 101, a monitoring camera 102 disposed outside the solar panel 101 and electrically connected to the solar panel 101, and a distribution box 103 disposed outside the solar panel 101 and electrically connected to the solar panel 101; the conduction assembly 200 comprises a floating block 201 which is arranged outside the solar panel 101 and is movably connected with the outer wall of the river levee, and a transmission rod 205 which is movably arranged outside the floating block 201; and, the correction assembly 300 comprises an outer disc 301 arranged outside the transmission rod 205, an outer clamping disc 302 movably arranged in the outer disc 301, an inner disc 304 movably arranged on the inner wall of the outer disc 301 and an inner clamping disc 303 arranged on the outer wall of the inner disc 304; and, the cue assembly 400 includes a tapping block 401 disposed outside the inner disk 304 and a sound emitting disk 402 disposed outside the tapping block 401. The distribution box 103 is electrically connected with a motor 104 through a wire, an output shaft 104a is arranged inside the motor 104, the output shaft 104a is connected with an input shaft 104b through bevel gear meshing, and a rotating shaft 104c is movably arranged outside the input shaft 104 b. One end of a transmission rod 205 is movably connected with the outer wall of the rotating shaft 104c, the other end of the transmission rod 205 is movably connected with a first hydraulic cylinder 204, one end of a pipeline 203 is connected in the first hydraulic cylinder 204, the other end of the pipeline 203 is connected with a second hydraulic cylinder 202, and the second hydraulic cylinder 202 is fixedly connected with a floating block 201.
Wherein, the transmission rod 205 is rotatably connected in the water level monitoring device bottom protective cover, and the outside of the floating block 201 is provided with an arc-shaped filter screen 206 which is fixed at the side of the river levee through bolts.
Further, the first hydraulic cylinder 204, the second hydraulic cylinder 202 and the connected pipeline 203 are filled with hydraulic oil, and when the floating block 201 moves, the hydraulic oil in the second hydraulic cylinder 202 is pushed to squeeze into the first hydraulic cylinder 204, so that the hydraulic rod in the first hydraulic cylinder 204 extends out, and the transmission rod 205 is pushed to rotate.
To sum up, when the water level rises in the river channel and is about to reach the alarm threshold value, the rising of the water level pushes the floating block 201 to rise, the floating block is transferred to the first hydraulic cylinder 204 through the second hydraulic cylinder 202, and then the transmission rod 205 is pushed to rotate, so that the floating block 201 is prevented from moving upwards and false touching the alarm due to sundries or garbage and the like floating in the river channel, the arc-shaped filter screen 206 is arranged on the periphery of the floating block 201, and when sundries or garbage and the like pass through, the surface of the arc-shaped filter screen 206 slides, the problem that false alarms are sent due to false touching of sundries in the river channel is avoided, and the accuracy of monitoring the water level is improved.
Example 2
Referring to fig. 5 to 6, in a second embodiment of the present application, the correction component 300 is provided to cooperate with other components, so as to reduce the probability of false alarm and make the accuracy of the water level monitoring alarm device higher.
Specifically, a connecting groove 104b-1 is formed in the outer wall of the input shaft 104b, the input shaft 104b is movably connected with the outer disc 301, a connecting block 301a which is movably matched with the connecting groove 104b-1 is arranged in the outer disc 301, and a first clamping groove 301b is formed in the outer wall of the outer disc 301. The outer disc 301 is movably connected with the outer clamping disc 302, a first clamping block 302a is arranged on the outer wall of the outer clamping disc 302, the first clamping block 302a is movably matched with the first clamping groove 301b, and a first friction plate 305 is arranged on the end face of the outer clamping disc 302. The inner wall of the inner chuck 303 is provided with a second clamping block 303a, and the outer wall of the inner chuck 303 is provided with a second friction plate 303b. The outer wall of the inner disc 304 is provided with a second clamping groove 304a, and the second clamping groove 304a is movably matched with the second clamping block 303 a. The inner disk 304 is internally provided with a first sleeve 306, and the first sleeve 306 is internally provided with a first spring 307. The outer wall of the inner disc 304 is movably provided with a push cylinder 308, a second sleeve 308a is arranged in the push cylinder 308, the second sleeve 308a is in sliding fit with the first sleeve 306, the inner wall of the push cylinder 308 is provided with a convex block, the convex block can be movably matched with the second clamping groove 304a, and the push cylinder 308 is clamped with the rotating shaft 104c.
Further, the engagement between the push cylinder 308 and the rotation shaft 104c is a sliding engagement, that is, the push cylinder 308 can slide along the rotation shaft 104c in the axial direction, and when either the push cylinder 308 or the rotation shaft 104c rotates, the other one of the push cylinder 308 and the rotation shaft 104c is driven to rotate synchronously.
It should be noted that the rotation shaft 104c does not rotate synchronously with the input shaft 104b when no external force acts, and the inner chuck 303 can slide along the inner wall of the outer disk 301.
In summary, when the water level rises to make the transmission rod 205 rotate, the transmission rod 205 pushes one end of the push cylinder 308 to axially displace along the input shaft 104b, and simultaneously compresses the first spring 307, one end of the push cylinder 308 close to the end surface of the inner chuck 303 pushes the inner chuck 303, the second clamping block 303a on the inner wall of the inner chuck 303 slides along the second clamping groove 304a on the outer wall of the inner disk 304, the inner chuck 303 slides along the inner wall of the outer disk 301, the inner chuck 303 pushes the second friction plate 303b towards the end surface of the first friction plate 305 along the direction of the input shaft 104b, when the water level rises to the dangerous threshold value, the end surfaces of the first friction plate 305 and the second friction plate 303b are in contact, the input shaft 104b is connected with the rotating shaft through friction force, that is, when the first friction plate 305 and the second friction plate 303b are in contact, the input shaft 104b can drive the rotating shaft 104c to rotate, so that power can be transferred into the prompt assembly 400, when the water level drops, the first friction plate 305 and the second friction plate 303b are separated, and the power of the rotating shaft 104c can play a role in warning for a worker when the water level changes.
Of course, the fluctuation of the river water flow is also a key to influence the water level monitoring, and the problem of false alarm caused by the fluctuation of the river water flow is also endangered, and in this embodiment, because the power is transmitted through the contact of the first friction plate 305 and the second friction plate 303b, the natural warning sound of the fluctuation of the water surface is also fluctuation, and the staff can judge whether the current water level exceeds the threshold value according to the consistency degree of the warning sound and the duration time of the warning sound.
Example 3
Referring to fig. 7-8, a third embodiment of the present application is provided, which is different from the previous embodiment in that a prompt unit 400 is provided, and a worker can be informed whether the water level reaches a threshold value by voice prompt.
Specifically, the outer wall joint of axis of rotation 104c has a turning 403, is provided with diamond-shaped lug 403a in the turning 403, and turning 403 swing joint is in the sounding disc 402 inner wall, and sounding disc 402 internal fixation is connected with supporting disk 404, and the supporting disk 404 terminal surface is provided with second spring 401a, and second spring 401a and knocking block 401 fixed connection.
The number of the knocking blocks 401 is two, and the knocking blocks are symmetrically arranged outside the supporting disc 404.
Further, the array of diamond-shaped bumps 403a is disposed on the inner wall of the handle 403, and the number of diamond-shaped bumps 403a is odd, i.e. when one of the diamond-shaped bumps 403a contacts one of the tapping blocks 401, the tapping block 401 located at the symmetrical position thereof is not in contact with the diamond-shaped bump 403 a.
In use, as illustrated in example 1 and example 2, when the water level rises to the threshold value, the power of the rotating shaft 104c is turned on, the rotating handle 403 rotates while driving the diamond-shaped bump 403a to rotate, the diamond-shaped bump 403a contacts the knocking block 401, so that the second spring 401a deforms and stores energy, when the diamond-shaped bump 403a is separated from the knocking block 401, the second spring 401a releases elastic energy, so that the knocking block 401 moves towards the inner wall of the sounding disc 402, and the inner wall of the sounding disc 402 is knocked, so that the sounding disc 402 sounds, and when the sounding disc 402 emits long and continuous warning sounds, the river water level reaches the threshold value, and the staff should take corresponding measures at this time.
It is important to note that the construction and arrangement of the application as shown in the various exemplary embodiments is illustrative only. Although only a few embodiments have been described in detail in this disclosure, those skilled in the art who review this disclosure will readily appreciate that many modifications are possible (e.g., variations in sizes, dimensions, structures, shapes and proportions of the various elements, values of parameters (e.g., temperature, pressure, etc.), mounting arrangements, use of materials, colors, orientations, etc.) without materially departing from the novel teachings and advantages of the subject matter described in this application. For example, elements shown as integrally formed may be constructed of multiple parts or elements, the position of elements may be reversed or otherwise varied, and the nature or number of discrete elements or positions may be altered or varied. Accordingly, all such modifications are intended to be included within the scope of present application. The order or sequence of any process or method steps may be varied or re-sequenced according to alternative embodiments. In the claims, any means-plus-function clause is intended to cover the structures described herein as performing the recited function and not only structural equivalents but also equivalent structures. Other substitutions, modifications, changes and omissions may be made in the design, operating conditions and arrangement of the exemplary embodiments without departing from the scope of the present applications. Therefore, the application is not limited to the specific embodiments, but extends to various modifications that nevertheless fall within the scope of the appended claims.
Furthermore, in order to provide a concise description of the exemplary embodiments, all features of an actual implementation may not be described (i.e., those not associated with the best mode presently contemplated for carrying out the application, or those not associated with practicing the application).
It should be appreciated that in the development of any such actual implementation, as in any engineering or design project, numerous implementation-specific decisions may be made. Such a development effort might be complex and time consuming, but would nevertheless be a routine undertaking of design, fabrication, and manufacture for those of ordinary skill having the benefit of this disclosure.
It should be noted that the above embodiments are only for illustrating the technical solution of the present application and not for limiting the same, and although the present application has been described in detail with reference to the preferred embodiments, it should be understood by those skilled in the art that the technical solution of the present application may be modified or substituted without departing from the spirit and scope of the technical solution of the present application, which is intended to be covered in the scope of the claims of the present application.

Claims (10)

1. A hydropower station water level monitoring alarm device which is characterized in that: comprising the steps of (a) a step of,
the energy storage assembly (100) comprises a solar panel (101), a monitoring camera (102) arranged outside the solar panel (101) and electrically connected with the solar panel (101), and a distribution box (103) arranged outside the solar panel (101) and electrically connected with the solar panel (101); the method comprises the steps of,
the conduction assembly (200) comprises a floating block (201) which is arranged outside the solar panel (101) and is movably connected with the outer wall of the river levee, and a transmission rod (205) which is movably arranged outside the floating block (201); the method comprises the steps of,
the correction assembly (300) comprises an outer disc (301) arranged outside the transmission rod (205), an outer chuck (302) movably arranged in the outer disc (301), an inner disc (304) movably arranged on the inner wall of the outer disc (301) and an inner chuck (303) arranged on the outer wall of the inner disc (304); the method comprises the steps of,
the prompt assembly (400) comprises a knocking block (401) arranged outside the inner disc (304) and a sounding disc (402) arranged outside the knocking block (401).
2. The hydropower station water level monitoring alarm device according to claim 1, wherein: the power distribution box (103) is electrically connected with a motor (104) through a wire, an output shaft (104 a) is arranged inside the motor (104), the output shaft (104 a) is connected with an input shaft (104 b) through bevel gear meshing, and a rotating shaft (104 c) is movably arranged outside the input shaft (104 b).
3. The hydropower station water level monitoring alarm device according to claim 2, wherein: one end of the transmission rod (205) is movably connected with the outer wall of the rotating shaft (104 c), a first hydraulic cylinder (204) is movably connected with the other end of the transmission rod (205), the inside of the first hydraulic cylinder (204) is connected with one end of the pipeline (203), the other end of the pipeline (203) is connected with a second hydraulic cylinder (202), and the second hydraulic cylinder (202) is fixedly connected with the floating block (201).
4. A hydropower station water level monitoring alarm device according to claim 3, wherein: the utility model discloses a motor, including input shaft (104 b), outer dish (301), input shaft (104 b), outer wall of input shaft (104 b) is provided with spread groove (104 b-1), input shaft (104 b) with outer dish (301) swing joint, be provided with in outer dish (301) with spread groove (104 b-1) clearance fit's connecting block (301 a), outer dish (301) outer wall is provided with first draw-in groove (301 b).
5. The hydropower station water level monitoring and alarming device according to claim 4, wherein: the outer disc (301) with outer card dish (302) swing joint, outer card dish (302) outer wall is provided with first fixture block (302 a), first fixture block (302 a) with first draw-in groove (301 b) clearance fit, outer card dish (302) terminal surface is provided with first friction disc (305).
6. The hydropower station water level monitoring and alarming device according to claim 5, wherein: the inner wall of the inner clamping disc (303) is provided with a second clamping block (303 a), and the outer wall of the inner clamping disc (303) is provided with a second friction plate (303 b).
7. The hydropower station water level monitoring and alarming device according to claim 6, wherein: the outer wall of the inner disc (304) is provided with a second clamping groove (304 a), and the second clamping groove (304 a) is in movable fit with the second clamping block (303 a).
8. The hydropower station water level monitoring alarm device according to claim 7, wherein: the inner disc (304) is internally provided with a first sleeve (306), and the first sleeve (306) is internally provided with a first spring (307).
9. The hydropower station water level monitoring and alarming device according to claim 8, wherein: the inner disc (304) outer wall activity is provided with pushes away section of thick bamboo (308), push away section of thick bamboo (308) inside is provided with second sleeve (308 a), second sleeve (308 a) with first sleeve (306) sliding fit, push away section of thick bamboo (308) inner wall is provided with the lug, the lug can with second draw-in groove (304 a) clearance fit, push away section of thick bamboo (308) with axis of rotation (104 c) joint.
10. The hydropower station water level monitoring alarm device according to claim 9, wherein: the rotary shaft (104 c) outer wall joint has a turning handle (403), be provided with diamond-shaped lug (403 a) in turning handle (403), turning handle (403) swing joint in sounding disc (402) inner wall, sounding disc (402) internal fixation has supporting disk (404), supporting disk (404) terminal surface is provided with second spring (401 a), second spring (401 a) with strike piece (401) fixed connection.
CN202311371067.1A 2023-10-23 2023-10-23 Hydropower station water level monitoring alarm device Active CN117109700B (en)

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GB0300842D0 (en) * 2003-01-15 2003-02-12 Butler Stephen Water level indicator
DE202004002278U1 (en) * 2004-02-10 2004-06-24 Locher, Francois Water level alarm has watertight housing with sensor circuit consisting of batteries, control stage and acoustic signal generator attached to inner surface of container to be filled by suction feet
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CN110646066A (en) * 2019-11-08 2020-01-03 李水娇 Constructed wetland water level alarm device
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