Acousto-optic alarm convenient for monitoring leakage of measuring weir and use method of acousto-optic alarm

Abstract

The invention belongs to the technical field of water conservancy safety monitoring, and particularly relates to a sound-light alarm device convenient for monitoring leakage of a measuring weir and a use method.The device comprises a device shell, the bottom of the device shell is communicated with the measuring weir through a communicating pipe, and a floating structure is arranged in the communicating pipe and connected with a T-shaped supporting rod; the limiting insulation fulcrum and the upper limiting conductive fulcrum are arranged on the inner wall of the device shell, and the T-shaped supporting rod is located between the two fulcrums; an alarm unit is arranged at the top of the device shell and forms a current loop through the outer wall of the device shell, the upper limiting conductive fulcrum and the T-shaped supporting rod for alarming. The problems of inconvenience in measurement operation and measurement errors of the measuring weir are solved through measurement, monitoring and alarming of the communicating pipe. The height of the upper limiting conductive fulcrum is set according to the alarm water level of the measuring weir, when the leakage amount suddenly increases and the cross section of the crest of the measuring weir suddenly rises, a circuit is immediately connected, the alarm lamp flickers, the alarm horn sounds an alarm, and the change condition of the measuring weir can be found in time.

Description

Technical Field

[0001] The invention belongs to the technical field of water conservancy safety monitoring, and in particular relates to an acousto-optic alarm device and a use method thereof, which are convenient for monitoring the leakage of a water measuring weir. Background Art

[0002] A water measuring weir is a device that calculates the amount of water passing through the weir section per unit time by measuring the water head at the weir top. It is usually used for seepage monitoring of hydraulic structures such as dams and engineering slopes of hydropower stations or pumped storage power stations. It is generally installed in channels, flumes and ditches. Common types of water measuring weirs include triangular weirs, rectangular weirs and trapezoidal weirs.

[0003] Since the water measuring weir is usually located on the ground, the existing technology requires leaning over and looking at the steel ruler close to the ground during measurement, which is extremely inconvenient. And due to the transparency of water, the line of sight cannot be level with the steel ruler during measurement, which leads to measurement errors. Tests have shown that the maximum error can reach 1~3mm. In addition, for large earth-rock dams, the water measuring weirs behind the dams are mostly located in remote environments, and it is impossible to detect the sudden increase in leakage and the sudden rise in the cross-section of the water measuring weir in time. Summary of the invention

[0004] The purpose of the present invention is to provide an audible and visual alarm device and a method of use for conveniently monitoring the leakage of a water measuring weir, so as to solve the technical problem in the prior art that a sudden increase in leakage or a sudden rise in the cross-section of the water measuring weir cannot be detected in time.

[0005] In order to achieve the above object, the present invention adopts the following technical solutions: In the first aspect, the present application discloses an audible and visual alarm device which is convenient for monitoring the leakage of a water measuring weir, comprising: a device housing, the bottom of the device housing being connected to the water measuring weir via a connecting pipe, one end of the connecting pipe being installed in the water measuring weir, and the other end passing through the bottom of the device housing and extending into the device housing, a floating structure being arranged in the connecting pipe, a T-shaped support rod being connected to the upper end of the floating structure, and the T-shaped support rod being movably connected between a lower limit insulating support point and an upper limit conductive support point; the limit insulating support point and the upper limit conductive support point are arranged on the inner wall of the device housing, an alarm unit is arranged on the top of the device housing, and the alarm unit forms a current loop through the outer wall of the device housing, the upper limit conductive support point and the T-shaped support rod for alarming.

[0006] Preferably, the alarm unit includes: an alarm light, an alarm horn and a battery. The alarm horn and the battery are mounted on the outer wall of the device housing, and the alarm light is mounted on the top of the device housing. When the T-shaped support rod slides upward under the action of the floating structure and contacts the upper limit conductive fulcrum, the alarm light, the alarm horn, the outer wall of the battery device housing, the upper limit conductive fulcrum and the T-shaped support rod form a current loop.

[0007] Preferably, the floating structure comprises: a float, a support rod and an insulator; the lower end of the support rod is connected to the float, and the upper end is connected to the insulator, the float contacts the water in the connecting pipe 1, and the insulator is connected to the lower end of the T-shaped support rod.

[0008] Preferably, the connecting pipe is made of PVC, and the height of the pipe opening at one end installed in the water measuring weir is flush with the lowest point of the water measuring weir plate.

[0009] Preferably, a sliding contact is installed on the T-shaped support rod, the sliding contact is in sliding contact with the inner wall of the device housing, and the sliding contact is in contact with the lower limit insulating support point or the upper limit conductive support point under the support of the T-shaped support rod.

[0010] Preferably, when the water measuring weir is at a low water level, the water level in the connecting pipe does not contact the floating structure, the T-shaped support rod contacts the lower limit insulating support point under the action of gravity, and the alarm unit is not turned on.

[0011] Preferably, when the measuring weir is at a high water level, the water level in the connecting pipe contacts the floating structure, the T-shaped support rod contacts the upper limit conductive support point under the action of buoyancy, and the alarm unit connects the circuit and sounds an alarm.

[0012] In a second aspect, the present application discloses a method for using the sound and light alarm device for monitoring leakage of a water measuring weir as described in any one of the above, comprising: When the water measuring weir is at a low water level, the water level in the connecting pipe does not contact the floating structure, the T-shaped support rod contacts the lower limit insulating support point under the action of gravity, and the alarm unit is not connected; When the measuring weir is at a high water level, the water level in the connecting pipe contacts the floating structure, and the T-shaped support rod contacts the upper limit conductive support point under the action of buoyancy, and the alarm unit connects the circuit and sounds an alarm.

[0013] Preferably, the alarm unit comprises: an alarm light, an alarm horn and a battery, and the method comprises: When the water measuring weir is at a low water level, the water level in the connecting pipe does not contact the floating structure, the T-shaped support rod contacts the lower limit insulating support point under the action of gravity, and the alarm light, alarm horn and battery are not connected; When the measuring weir is at a high water level, the water level in the connecting pipe contacts the floating structure, and the T-shaped support rod contacts the upper limit conductive fulcrum under the action of buoyancy. The alarm light, alarm horn, outer wall of the battery device casing, upper limit conductive fulcrum and T-shaped support rod form a current loop, and the alarm light and alarm horn sound an alarm.

[0014] Preferably, the floating structure comprises: a floating ball, a support rod and an insulator, and the method comprises: When the water measuring weir is at a low water level, the water level in the connecting pipe does not contact the float, the T-shaped support rod contacts the lower limit insulating support point under the gravity of the float, support rod and insulator, and the alarm unit is not connected; When the measuring weir is at a high water level, the water level in the connecting pipe contacts the float, and the T-shaped support rod contacts the upper limit conductive support point under the buoyancy of the float. The alarm unit connects the circuit and sounds an alarm.

[0015] Compared with the prior art, the present invention has the following beneficial effects: The present application provides an acoustic and visual alarm device for conveniently monitoring the leakage of a water measuring weir, which improves the existing water measuring weir monitoring method, and solves the inconvenience of measuring the water measuring weir and the measurement error by measuring and monitoring the alarm through a connecting pipe. The height of the upper limit conductive fulcrum is set according to the alarm water level of the water measuring weir. When the leakage suddenly increases and the cross section of the water measuring weir suddenly rises, the line is immediately connected, the alarm light flashes, and the alarm horn sounds an alarm, so that the change of the water measuring weir can be discovered in time.

[0016] The present application discloses an audible and visual alarm device for conveniently monitoring the leakage of a water measuring weir. An insulator is installed between a support rod and a T-shaped support rod, which can prevent the line from contacting the leaking water in the connecting pipe and avoid electric leakage.

[0017] The present application discloses an audible and visual alarm device for monitoring leakage of a water measuring weir. A lower limit insulating fulcrum and an upper limit conductive fulcrum are provided to limit the range of motion of a T-shaped support rod, and the opening and closing of a circuit is controlled by the conductive material of the fulcrum.

[0018] The invention has a reasonable structure, good stability and is easy to install and replace; the material and installation costs are relatively economical and the alarm effect is reliable. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings required for use in the embodiments are briefly introduced below. It should be understood that the following drawings only show certain embodiments of the present invention and therefore should not be regarded as limiting the scope. For ordinary technicians in this field, other related drawings can be obtained based on these drawings without creative work.

[0020] Figure 1 It is a schematic diagram of the structural principle of the present invention; Figure 2 Schematic diagram of the main control circuit of the present invention.

[0021] Among them: 1-connecting pipe; 2-floating ball; 3-support rod; 4-insulator; 5-T-type support rod; 6-lower limit insulating support point; 7-sliding contact; 8-upper limit conductive support point; 9-alarm light; 10-alarm horn; 11-battery; 12-device casing; 13-water surface; 14-water measuring weir plate. DETAILED DESCRIPTION

[0022] In order to make the purpose, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are part of the embodiments of the present invention, not all of the embodiments. Generally, the components of the embodiments of the present invention described and shown in the drawings here can be arranged and designed in various different configurations.

[0023] Therefore, the following detailed description of the embodiments of the present invention provided in the accompanying drawings is not intended to limit the scope of the invention claimed for protection, but merely represents selected embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0024] It should be noted that similar reference numerals and letters denote similar items in the following drawings, and therefore, once an item is defined in one drawing, further definition and explanation thereof is not required in subsequent drawings.

[0025] In the description of the embodiments of the present invention, it should be noted that if the terms "upper", "lower", "horizontal", "inner", etc. indicate an orientation or positional relationship based on the orientation or positional relationship shown in the drawings, or the orientation or positional relationship in which the product of the invention is usually placed when in use, it is only for the convenience of describing the present invention and simplifying the description, and does not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present invention. In addition, the terms "first", "second", etc. are only used to distinguish the description, and cannot be understood as indicating or implying relative importance.

[0026] In addition, if the term "horizontal" appears, it does not mean that the component must be absolutely horizontal, but can be slightly tilted. For example, "horizontal" only means that its direction is more horizontal than "vertical", which does not mean that the structure must be completely horizontal, but can be slightly tilted.

[0027] In the description of the embodiments of the present invention, it is also necessary to explain that, unless otherwise clearly specified and limited, the terms "set", "install", "connect", and "connect" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal connection of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0028] The present invention is further described in detail below in conjunction with the accompanying drawings: See also Figure 1The present application discloses an acoustic and visual alarm device for conveniently monitoring the leakage of a water measuring weir, comprising: a device housing 12, the bottom of the device housing 12 is connected to the water measuring weir through a connecting pipe 1, one end of the connecting pipe 1 is installed in the water measuring weir, and the other end passes through the bottom of the device housing 12 and extends into the device housing 12, and the connecting pipe 1 is used to measure, monitor and alarm, thereby solving the inconvenience of measuring the water measuring weir and measuring errors. A floating structure is arranged in the connecting pipe 1, and a T-shaped support rod 5 is connected to the upper end of the floating structure, and the T-shaped support rod 5 is movably connected between the lower limit insulating support point 6 and the upper limit conductive support point 8; the limit insulating support point 6 and the upper limit conductive support point 8 are arranged on the inner wall of the device housing 12, and an alarm unit is arranged on the top of the device housing 12, and the alarm unit forms a current loop through the outer wall of the device housing 12, the upper limit conductive support point 8 and the T-shaped support rod 5 for alarming. The height of the upper limit conductive support point is set according to the alarm water level of the water measuring weir. When the leakage suddenly increases and the cross section of the water measuring weir suddenly rises, the line is immediately connected, the alarm light flashes, and the alarm horn sounds an alarm, so that the change of the water measuring weir can be discovered in time. It can overcome the remote location of the water measuring weir and timely monitor and discover the sudden increase in leakage and the sudden rise in the cross section of the water measuring weir. In addition, the device has a simplified structure and a simple circuit, which meets the use requirements of rapid alarm for water measuring weir monitoring.

[0029] Directions: When the water measuring weir is at a low water level, the water level in the connecting pipe 1 does not contact the floating structure, the T-shaped support rod 5 contacts the lower limit insulating support point 6 under the action of gravity, and the alarm unit is not turned on; When the water measuring weir is at a high water level, the water level in the connecting pipe 1 contacts the floating structure, and the T-shaped support rod 5 contacts the upper limit conductive support point 8 under the action of buoyancy, and the alarm unit connects the circuit and sounds an alarm.

[0030] In some embodiments, the alarm unit includes: an alarm light 9, an alarm horn 10 and a battery 11, the alarm horn 10 and the battery 11 are mounted on the outer wall of the device housing 12, and the alarm light 9 is mounted on the top of the device housing 12. When the T-shaped support rod 5 slides upward under the action of the floating structure and contacts the upper limit conductive support point 8, the alarm light 9, the alarm horn 10, the battery 11, the outer wall of the device housing 12, the upper limit conductive support point 8 and the T-shaped support rod 5 form a current loop. The circuit is controlled to open and close by the conductive material of the support point, and the structure is simple and easy to implement.

[0031] Directions: When the water measuring weir is at a low water level, the water level in the connecting pipe 1 does not contact the floating structure, the T-shaped support rod 5 contacts the lower limit insulating support point 6 under the action of gravity, and the alarm light 9, the alarm horn 10 and the battery 11 are not connected; When the measuring weir is at a high water level, the water level in the connecting pipe 1 contacts the floating structure, and the T-shaped support rod 5 contacts the upper limit conductive support point 8 under the action of buoyancy, and the alarm light 9, the alarm horn 10, the outer wall of the battery 11 device housing 12, the upper limit conductive support point 8 and the T-shaped support rod 5 form a current loop, and the alarm light 9 and the alarm horn 10 sound an alarm.

[0032] In some embodiments, the floating structure includes: a floating ball 2, a support rod 3 and an insulator 4; the lower end of the support rod 3 is connected to the floating ball 2, and the upper end is connected to the insulator 4, the floating ball 2 is in contact with the water in the connecting pipe 1, and the insulator 4 is connected to the lower end of the T-shaped support rod 5. The insulator is installed between the support rod and the T-shaped support rod to prevent the line from contacting the leaking water in the connecting pipe, avoid leakage, and improve the safety of the device.

[0033] Directions: When the water measuring weir is at a low water level, the water level in the connecting pipe 1 does not contact the float 2, the T-shaped support rod 5 contacts the lower limit insulating support point 6 under the gravity of the float 2, the support rod 3 and the insulator 4, and the alarm unit is not turned on; When the water measuring weir is at a high water level, the water level in the connecting pipe 1 contacts the float 2, and the T-shaped support rod 5 contacts the upper limit conductive support point 8 under the buoyancy of the float 2, and the alarm unit connects the circuit and sounds an alarm.

[0034] In some embodiments, the connecting pipe 1 is made of PVC, and the height of the pipe opening at one end installed in the water measuring weir is flush with the lowest point of the water measuring weir plate 14 .

[0035] In some embodiments, a sliding contact 7 is installed on the T-shaped support rod 5, and the sliding contact 7 is in sliding contact with the inner wall of the device housing 12, and the sliding contact 7 is in contact with the lower limit insulating support 6 or the upper limit conductive support 8 under the support of the T-shaped support rod 5. Good contact between the T-shaped support rod 5 and the lower limit insulating support 6 or the upper limit conductive support 8 is ensured.

[0036] Directions: When the water measuring weir is at a low water level, the water level in the connecting pipe 1 is not in contact with the floating structure, and the sliding contact 7 of the T-shaped support rod 5 is in contact with the lower limit insulating support 6 under the action of gravity, and the alarm unit is not connected; When the water measuring weir is at a high water level, the water level in the connecting pipe 1 contacts the floating structure, and under the action of buoyancy, the sliding contact 7 of the T-shaped support rod 5 contacts the upper limit conductive support 8, and the alarm unit connects the circuit and sounds an alarm.

[0037] In some embodiments, when the water measuring weir is at a low water level, the water level in the connecting pipe 1 is not in contact with the floating structure, the T-shaped support rod 5 is in contact with the lower limit insulating support point 6 under the action of gravity, and the alarm unit is not turned on.

[0038] In some embodiments, when the water measuring weir is at a high water level, the water level in the connecting pipe 1 contacts the floating structure, the T-shaped support rod 5 contacts the upper limit conductive support point 8 under the action of buoyancy, and the alarm unit connects the circuit and sounds an alarm.

[0039] In some embodiments, see Figure 1 The present application discloses an audible and visual alarm device for monitoring the leakage of a water measuring weir, comprising: a connecting pipe 1, a float 2, a support rod 3, an insulator 4, a T-shaped support rod 5, a lower limit insulating support point 6, a sliding contact 7, an upper limit conductive support point 8, an alarm light 9, an alarm horn 10, a battery 11 and a device housing 12.

[0040] The connecting pipe 1 of the present invention is made of PVC, with a circular cross-section. One end is installed in the water measuring weir, and the height of the pipe mouth is level with the lowest point of the water measuring weir plate; the float 2 is on the other side of the connecting pipe 1, and is made of hollow PVC and is in the shape of a sphere; the support rod 3 connects the float 2 and the insulator 4, and the support rod is made of pure aluminum hard wire; the insulator 4 is made of ceramic and is in the shape of a cylinder, and is connected to the support rod 3 and the T-shaped support rod 5 respectively; the T-shaped support rod 5 is made of conductive hard steel wire, and sliding contacts 7 are installed at both ends of the T-shaped support rod 5; the sliding contact 7 is made of stainless steel, in the shape of a cylinder, and in the form of a roller, and the roller axis is fixed to the end points on both sides of the T-shaped support rod 5. The float 2, the support rod 3, the insulator 4, the structure 5 T-shaped support rod, and the sliding contact 7 form an integral component and can move synchronously. The lower limit insulating support 6 is made of ceramic material and is in the shape of a cuboid, one on each side; the upper limit conductive support 8 is made of stainless steel and is in the shape of a cuboid, one on each side; the alarm light 9; the alarm horn 10; the battery 11 (12V). The device shell 12 is made of PVC material, and the connecting pipe 1 part, the float 2, the support rod 3, the insulator 4, the T-shaped support rod 5, and the sliding contact 7 are inside the device shell 12; the lower limit insulating support 6 and the upper limit conductive support 8 are installed on the inner wall of the device shell 12; the alarm light 9, the alarm horn 10, and the battery 11 are installed on the outside of the device shell 12.

[0041] See also Figure 2 The circuit diagram of a sound and light alarm device for monitoring the leakage of a water measuring weir in the present application includes: a T-shaped support rod, a sliding contact, an upper limit conductive support rod, an alarm light, an alarm horn, and a battery (12V). When the sliding contacts 7 at both ends of the T-shaped support rod 5 contact the upper limit conductive support rod 8, the circuit is connected, the alarm light flashes, and the alarm horn sounds an alarm.

[0042] When the water measuring weir is at a lower water level, the water level of the connecting pipe 1 does not touch the float 2, and the integral component consisting of the float 2, the support rod 3, the insulator 4, the T-shaped support rod 5, and the sliding contact 7 is supported by the lower limit insulating support 6 and suspended in the device housing 12. At this time, when the sliding contacts 7 at both ends of the T-shaped support rod 5 contact the upper limit conductive support 8, the circuit is disconnected, and the alarm light 9 and the alarm horn 10 do not work.

[0043] When the water measuring weir is at a medium water level, the water level of the connecting pipe 1 touches the float 2, and the whole component composed of the float 2, the support rod 3, the insulator 4, the T-shaped support rod 5, and the sliding contact 7 moves upward under the influence of the buoyancy of the float 2, and the sliding support of the sliding contact 7 leaves the lower limit insulating support 6, but does not touch the upper limit conductive support 8, and is suspended in the device housing 12. At this time, the sliding contacts 7 at both ends of the T-shaped support rod 5 slide without contacting the upper limit conductive support 8, the circuit is disconnected, and the alarm light 9 and the alarm horn 10 do not work.

[0044] When the water measuring weir is at a higher (alarm) water level, the water level of the connecting pipe 1 touches the float 2, and the integral component consisting of the float 2, the support rod 3, the insulator 4, the T-shaped support rod 5, and the sliding contact 7 moves upward under the buoyancy of the float 2, and the sliding contact 7 leaves the lower limit insulating support 6 and touches the upper limit conductive support 8, and is suspended in the device housing 12. At this time, the sliding contacts 7 at both ends of the T-shaped support rod 5 slide and contact the upper limit conductive support 8, the circuit is connected, the alarm light flashes, and the alarm horn sounds an alarm.

[0045] In summary, the present application discloses an audible and visual alarm device for monitoring the leakage of a water measuring weir, which includes a connecting pipe 1, a floating ball 2, a supporting rod 3, an insulator 4, a T-shaped support rod 5, a lower limit insulating support point 6, a sliding contact 7, an upper limit conductive support point 8, an alarm light 9, an alarm horn 10, a battery 11 and a device housing 12. The present application provides a new idea for the automatic monitoring and alarm of the water measuring weir, which is convenient for measurement and operation, can overcome the remote location of the water measuring weir, and timely monitor and discover the situation where the leakage volume suddenly increases and the cross section of the water measuring weir mouth suddenly rises. The device structure is simplified and the circuit is simple, which meets the use requirements of rapid alarm for monitoring the water measuring weir. Specifically, in the circuit structure of the present application, when the seepage volume suddenly increases and the water measuring weir is at the alarm water level, the floating ball of the device lifts the sliding contacts 7 at both ends of the T-shaped support rod to contact the upper limit conductive support point 8, so that the circuit is connected, the alarm light flashes, and the alarm horn sounds an alarm.

[0046] The above are only preferred embodiments of the present invention and are not intended to limit the present invention. For those skilled in the art, the present invention may have various modifications and variations. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. An audible and visual alarm device for monitoring the leakage of a water measuring weir, characterized in that: include: The device housing (12) is connected to a water measuring weir through a connecting pipe (1) at the bottom of the device housing (12); one end of the connecting pipe (1) is installed in the water measuring weir, and the other end passes through the bottom of the device housing (12) and extends into the device housing (12); a floating structure is arranged in the connecting pipe (1); a T-shaped support rod (5) is connected to the upper end of the floating structure; the T-shaped support rod (5) is movably connected between a lower limit insulating support point (6) and an upper limit conductive support point (8); the limit insulating support point (6) and the upper limit conductive support point (8) are arranged on the inner wall of the device housing (12); an alarm unit is arranged on the top of the device housing (12); the alarm unit forms a current loop through the outer wall of the device housing (12), the upper limit conductive support point (8) and the T-shaped support rod (5) for alarming.

2. The sound and light alarm device for monitoring water weir leakage according to claim 1, characterized in that: The alarm unit comprises: an alarm light (9), an alarm horn (10) and a battery (11); the alarm horn (10) and the battery (11) are mounted on the outer wall of a device housing (12); the alarm light (9) is mounted on the top of the device housing (12); when the T-shaped support rod (5) slides upward under the action of the floating structure and contacts the upper limit conductive support point (8), the alarm light (9), the alarm horn (10), the battery (11), the outer wall of the device housing (12), the upper limit conductive support point (8) and the T-shaped support rod (5) form a current loop.

3. The sound and light alarm device for monitoring water weir leakage according to claim 1, characterized in that: The floating structure comprises: a floating ball (2), a supporting rod (3) and an insulator (4); the lower end of the supporting rod (3) is connected to the floating ball (2), and the upper end is connected to the insulator (4); the floating ball (2) is in contact with water in the connecting pipe 1, and the insulator (4) is connected to the lower end of the T-shaped supporting rod (5).

4. The sound and light alarm device for monitoring water weir leakage according to claim 1, characterized in that: The connecting pipe (1) is made of PVC, and the height of the pipe opening at one end installed in the water measuring weir is flush with the lowest point of the water measuring weir plate (14).

5. The sound and light alarm device for monitoring water weir leakage according to claim 1, characterized in that: A sliding contact (7) is mounted on the T-shaped support rod (5), the sliding contact (7) is in sliding contact with the inner wall of the device housing (12), and the sliding contact (7) is in contact with the lower limit insulating support point (6) or the upper limit conductive support point (8) under the support of the T-shaped support rod (5).

6. The sound and light alarm device for monitoring water weir leakage according to claim 1, characterized in that: When the water measuring weir is at a low water level, the water level in the connecting pipe (1) does not contact the floating structure, the T-shaped support rod (5) contacts the lower limit insulating support point (6) under the action of gravity, and the alarm unit is not connected.

7. The sound and light alarm device for monitoring water weir leakage according to claim 1, characterized in that: When the water measuring weir is at a high water level, the water level in the connecting pipe (1) contacts the floating structure, the T-shaped support rod (5) contacts the upper limit conductive support point (8) under the action of buoyancy, and the alarm unit connects the circuit and sounds an alarm.

8. A method for using the sound and light alarm device for monitoring water weir leakage according to any one of claims 1 to 7, characterized in that: include: When the water measuring weir is at a low water level, the water level in the connecting pipe (1) does not contact the floating structure, the T-shaped support rod (5) contacts the lower limit insulating support point (6) under the action of gravity, and the alarm unit is not turned on; When the water measuring weir is at a high water level, the water level in the connecting pipe (1) contacts the floating structure, the T-shaped support rod (5) contacts the upper limit conductive support point (8) under the action of buoyancy, and the alarm unit connects the circuit and sounds an alarm.

9. The method for using the sound and light alarm device for monitoring the leakage of a water measuring weir according to claim 8, characterized in that: The alarm unit comprises: an alarm light (9), an alarm horn (10) and a battery (11), and the method comprises: When the water measuring weir is at a low water level, the water level in the connecting pipe (1) does not contact the floating structure, the T-shaped support rod (5) contacts the lower limit insulating support point (6) under the action of gravity, and the alarm light (9), the alarm horn (10) and the battery (11) are not connected; When the water measuring weir is at a high water level, the water level in the connecting pipe (1) contacts the floating structure, the T-shaped support rod (5) contacts the upper limit conductive support point (8) under the action of buoyancy, and the alarm light (9), the alarm horn (10), the outer wall of the battery (11) device housing (12), the upper limit conductive support point (8) and the T-shaped support rod (5) form a current loop, and the alarm light (9) and the alarm horn (10) sound an alarm.

10. The method for using the sound and light alarm device for monitoring water weir leakage according to claim 8, characterized in that: The floating structure comprises: a floating ball (2), a support rod (3) and an insulator (4), and the method comprises: When the water measuring weir is at a low water level, the water level in the connecting pipe (1) does not contact the float (2), the T-shaped support rod (5) contacts the lower limit insulating support point (6) under the action of the gravity of the float (2), the support rod (3) and the insulator (4), and the alarm unit is not turned on; When the water measuring weir is at a high water level, the water level in the connecting pipe (1) contacts the float (2), and the T-shaped support rod (5) contacts the upper limit conductive support point (8) under the buoyancy of the float (2), and the alarm unit connects the circuit and sounds an alarm.

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