Shallow river flow velocity measuring device

Abstract

The invention belongs to the technical field of river monitoring equipment, and relates to a shallow river flow velocity measuring device, which comprises a floating plate, a counterweight plate and a plurality of mounting strips, the multiple groups of current meters are in one-to-one correspondence with the multiple mounting strips, each group of current meters is arranged on the corresponding mounting strip, and each group of current meters comprises at least one current meter; and the distance adjusting mechanism is arranged between the floating plate and the counterweight plate and is used for adjusting the distance between the floating plate and the adjacent mounting strip, the distance between two adjacent mounting strips and the distance between the counterweight plate and the adjacent mounting strip, so that the plurality of flow meters are located at different depths of the river. The distance between the floating plate and the adjacent mounting strip, the distance between every two adjacent mounting strips and the distance between the counterweight plate and the adjacent mounting strip can be adjusted, so that the multiple flow meters are located at different depths of a river, the flow velocity of water flow at different depths is measured at the same time, multiple times of measurement are avoided, the time required for measuring the flow velocity of the river is shortened, and the measurement efficiency is improved. And the efficiency of river flow velocity measurement is improved.

Description

Technical Field

[0001] The invention belongs to the technical field of river monitoring equipment and relates to a shallow water river flow velocity measuring device. Background Art

[0002] River flow velocity measurement is a key component of hydrological monitoring. It helps to understand the hydrological movement patterns of rivers, evaluate water resources, and predict future hydrological changes. Real-time monitoring of river velocity and flow can help managers understand the distribution and changes of water resources, and provide a scientific basis for the rational allocation and scheduling of water resources. In flood control and waterlogging prevention work, real-time monitoring of flow velocity and flow can promptly detect abnormal situations such as floods, and provide timely and accurate information support for flood warning and emergency response.

[0003] At present, when measuring the river velocity, a flow velocity measuring device is often used. The flow velocity measuring device is placed in the water on the shore or on a boat to measure the flow velocity of the water flow at a certain depth of the river.

[0004] However, since the flow velocity profile of a river is usually not uniform, if it is necessary to measure the flow velocity of water at different depths, the position of the measuring device needs to be adjusted multiple times, making the entire measurement process more cumbersome, increasing the time required for river flow measurement, and reducing the efficiency of river flow measurement. Summary of the invention

[0005] The object of the present invention is to provide a shallow river flow velocity measuring device, which can simultaneously measure the flow velocity of water at different depths, avoids multiple adjustments to the position of the measuring device, and reduces the time required for river flow velocity measurement.

[0006] To achieve the above purpose, the specific technical solution of a shallow river flow velocity measuring device provided by the present invention is as follows:

[0007] A shallow river flow velocity measuring device comprises a floating plate, a counterweight plate is arranged on one side of the floating plate, and further comprises:

[0008] A plurality of mounting bars are sequentially and spaced apart between the floating board and the counterweight board, and each mounting bar is parallel to the floating board;

[0009] A plurality of groups of flow meters correspond to a plurality of mounting strips one by one, and each group of flow meters is arranged on a corresponding mounting strip;

[0010] The spacing adjustment mechanism is arranged between the floating plate and the counterweight plate, and is used to adjust the distance between the floating plate and the adjacent mounting bar, between two adjacent mounting bars, and between the counterweight plate and the adjacent mounting bar, so that multiple flow meters are at different depths of the river.

[0011] The present invention is also characterized in that:

[0012] The spacing adjustment mechanism includes: multiple telescopic components, every two telescopic components are respectively arranged on both sides of each mounting bar, the floating plate is connected to the adjacent mounting bar through a telescopic component, the two adjacent mounting bars are connected through a telescopic component, and the counterweight plate is connected to the adjacent mounting bar through a telescopic component; a lifting component is connected to the counterweight plate to drive the counterweight plate to move up and down.

[0013] Each telescopic assembly includes: two movable rods, which are V-shaped, and the angle ends of the two movable rods close to the floating board are respectively hinged to the floating board, the angle ends of the two movable rods between two adjacent mounting bars are respectively hinged to the mounting bar close to the floating board, and the angle ends of the two movable rods close to the counterweight plate are respectively hinged to the corresponding mounting bars; two sliders are respectively hinged to the other ends of the two movable rods, the two sliders close to the floating board are slidably connected to the corresponding mounting bars along the length direction of the mounting bars, the two sliders between two adjacent mounting bars are slidably connected to the mounting bar close to the counterweight plate along the length direction of the mounting bars, and the two sliders close to the counterweight plate are slidably connected to the counterweight plate along the length direction of the mounting bar.

[0014] A slide groove is provided at a position near the two sliders on each mounting bar and at a position near the two sliders on the counterweight plate. The two sliders are arranged in the corresponding slide grooves. A guide rod is horizontally arranged in each slide groove. The guide rod passes through the corresponding two sliders and is slidably connected with the two sliders.

[0015] Two movable plates are vertically arranged at a position between two sliders in each slide groove, each movable plate is slidably connected to the side wall of the slide groove, and two ends of the guide rod are rotatably connected to the inner walls of the two ends of the slide groove respectively. The guide rod passes through the two movable plates and is threadedly connected to the two movable plates. The threads on the guide rod close to the two movable plates are in opposite directions. An elastic member is sleeved on the guide rod between each movable plate and the adjacent slider, and two ends of the elastic member are respectively connected to the corresponding movable plate and the corresponding slider, and one end of the guide rod is connected to a rotating assembly, which is used to drive the guide rod to rotate forward and reverse.

[0016] The rotating assembly includes: a cavity, which is opened in the mounting strip and is located close to one end of the guide rod, the end of the guide rod is located in the cavity and is rotatably connected to the inner wall of the cavity; a first gear is sleeved on the guide rod; a rack is horizontally arranged in the cavity and is located close to the first gear, the rack is meshed with the first gear, and both ends of the rack pass through the inner wall of the cavity and are located outside the mounting strip.

[0017] There are four flow meters in each group, and each mounting bar is composed of a first connecting bar, two second connecting bars and four connecting rings. The four flow meters are respectively arranged in the four connecting rings. The first connecting bar and the two second connecting bars are arranged between the four connecting rings from left to right. The two second connecting bars are located on both sides of the first connecting bar. The two ends of the first connecting bar are respectively connected to the corresponding two connecting rings, and the two ends of each first connecting bar are respectively connected to the corresponding two connecting rings. Each slide groove is opened in the upper part of the first connecting bar.

[0018] Each flow meter is connected to a corresponding connection ring via a horizontally arranged rotating shaft, and a tail wing plate is horizontally arranged at the tail end of each flow meter.

[0019] The lifting assembly includes: two pull ropes, which are respectively arranged on both sides of the floating board, and the lower end of each pull rope is connected to the counterweight plate; two first limiting cylinders, which are respectively vertically arranged on both sides of the floating board and are located close to the two pull ropes, and each pull rope passes through the corresponding first limiting cylinder; a wire-reeling assembly, which is arranged on the upper part of the floating board and is connected to the upper ends of the two pull ropes, and the wire-reeling assembly is used to release and reel in the two pull ropes.

[0020] A limiting rod is horizontally arranged between each outermost connecting ring and the adjacent pull rope, one end of the limiting rod is connected to the corresponding connecting ring, and the other end of the limiting rod is connected to a second limiting cylinder, which is vertically arranged and through which the pull rope passes.

[0021] The shallow water river flow velocity measuring device of the present invention has the following advantages:

[0022] First, through the floating plate, multiple mounting bars, multiple groups of flow meters and the spacing adjustment mechanism, the distance between the floating plate and the adjacent mounting bar, between two adjacent mounting bars, and between the counterweight plate and the adjacent mounting bar can be adjusted, so that multiple flow meters are located at different depths of the river and the flow velocities of water at different depths are measured at the same time, avoiding multiple measurements, reducing the time required for river flow velocity measurement, and improving the efficiency of river flow velocity measurement.

[0023] Secondly, through the cooperation of the guide rod, two sliders, two movable plates and the rotating assembly on each mounting bar, the distance between the two sliders can be adjusted through the two movable plates, so that the distances between multiple flow meters from top to bottom can be adjusted in turn, so that the distances between two adjacent flow meters are different, and then when measuring the flow velocity of water at different depths, the measuring depth can be adjusted as needed, further reducing the time required for river flow velocity measurement. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] Figure 1 It is a schematic diagram of the main structure of the present invention;

[0025] Figure 2It is a schematic diagram of the internal main structure of the present invention;

[0026] Figure 3 For the present invention Figure 2 A magnified view of the local structure of part A;

[0027] Figure 4 It is a schematic diagram of the top view of the counterweight plate in the present invention;

[0028] Figure 5 For the present invention Figure 4 A magnified view of the local structure of part B;

[0029] Figure 6 For the present invention Figure 4 A magnified view of the local structure of part C in the middle;

[0030] Figure 7 It is a schematic diagram of the side structure of the cavity in the present invention;

[0031] Figure 8 It is a side view structural schematic diagram of the flow meter and the tail wing plate in the present invention;

[0032] Fig. 9 It is a schematic diagram of the side structure of the floating board in the present invention.

[0033] Reference numerals:

[0034] 1. Floating plate; 2. Counterweight plate; 3. Flow meter; 4. Box; 5. Motor; 6. Mounting bar; 601. First connecting bar; 602. Second connecting bar; 603. Connecting ring; 7. Tail plate; 8. Guide rod; 9. Slide groove; 10. Slider; 11. Elastic member; 12. Movable rod; 13. Moving plate; 14. Partition; 15. Cavity; 16. First gear; 17. Second gear; 18. Third gear; 19. Rack; 20. Block; 21. First through hole; 22. Pull rope; 23. Take-up drum; 24. Connecting shaft; 25. Battery; 26. Fixed pulley; 27. Second through hole; 28. Limit rod; 29. ​​First limit cylinder; 30. Second limit cylinder. DETAILED DESCRIPTION

[0035] The technical solution in the present application will be described clearly and in detail below in conjunction with the accompanying drawings. Among them, in the description of the embodiments of the present application, unless otherwise specified, " / " means or, for example, A / B can mean A or B: "and / or" in the text is only a description of the association relationship of associated objects, indicating that there can be three relationships, such as A and / or B, which can mean: A exists alone, A and B exist at the same time, and B exists alone. In addition, in the description of the embodiments of the present application, "multiple" refers to two or more than two. The following terms "first" and "second" are used for descriptive purposes only and cannot be understood as implying or suggesting relative importance or implicitly indicating the number of technical features indicated. Therefore, the features defined as "first" and "second" may explicitly or implicitly include one or more of the features.

[0036] like Figure 1 , Figure 2 As shown, the present invention provides a shallow river flow velocity measuring device, comprising a horizontally arranged floating board 1, a plurality of mounting bars 6, a plurality of groups of current meters 3 and a spacing adjustment mechanism, a counterweight plate 2 is horizontally arranged below the floating board 1, a plurality of mounting bars 6 are horizontally spaced from top to bottom in sequence between the floating board 1 and the counterweight plate 2, a plurality of groups of current meters 3 correspond to a plurality of mounting bars 6 one by one, each group of current meters 3 is arranged on a corresponding mounting bar 6, the current meters 3 are used to measure the flow velocity of water flow, the spacing adjustment mechanism is arranged between the floating board 1 and the counterweight plate 2, the spacing adjustment mechanism is used to adjust the distance between the floating board 1 and the adjacent mounting bars 6, between two adjacent mounting bars 6, and between the counterweight plate 2 and the adjacent mounting bars 6, so that the plurality of current meters 3 are at different depths of the river, and the flow velocities of water flow at different depths are measured at the same time, thereby avoiding multiple measurements, reducing the time required for river flow velocity measurement, and improving the efficiency of river flow velocity measurement.

[0037] like Figure 2 , Figure 3 As shown, the spacing adjustment mechanism includes: multiple telescopic components, every two telescopic components are respectively arranged on both sides of each mounting bar 6, the floating plate 1 is connected to the adjacent mounting bar 6 through a telescopic component, the two adjacent mounting bars 6 are connected through a telescopic component, and the counterweight plate 2 is connected to the adjacent mounting bar 6 through a telescopic component; a lifting component, connected to the counterweight plate 2, used to drive the counterweight plate 2 to move up and down.

[0038] like Figure 2 , Figure 3As shown, each telescopic assembly includes: two movable rods 12, the two movable rods 12 are V-shaped, the angle ends of the two movable rods 12 close to the floating board 1 are respectively hinged to the floating board 1, the angle ends of the two movable rods 12 between two adjacent mounting bars 6 are respectively hinged to the mounting bars 6 close to the floating board 1, and the angle ends of the two movable rods 12 close to the counterweight plate 2 are respectively hinged to the corresponding mounting bars 6; two sliders 10 are respectively hinged to the other ends of the two movable rods 12, the two sliders 10 close to the floating board 1 are slidably connected to the corresponding mounting bars 6 along the length direction of the mounting bars 6, the two sliders 10 between two adjacent mounting bars 6 are slidably connected to the mounting bars 6 close to the counterweight plate 2 along the length direction of the mounting bars 6, and the two sliders 10 close to the counterweight plate 2 are slidably connected to the counterweight plate 2 along the length direction of the mounting bars 6, so that the distance between the floating board 1 and the adjacent mounting bars 6, between two adjacent mounting bars 6, and between the counterweight plate 2 and the adjacent mounting bars 6 can be adjusted by changing the angle between the two movable rods 12.

[0039] like Figure 2 , Figure 3 As shown, a slide groove 9 is provided at a position near the two sliders 10 on each mounting bar 6 and at a position near the two sliders 10 on the counterweight plate 2. The two sliders 10 are arranged in the corresponding slide grooves 9. A guide rod 8 is horizontally arranged in each slide groove 9. The guide rod 8 passes through the corresponding two sliders 10 and is slidably connected with the two sliders 10. The two sliders 10 are limited by the guide rod 8, so that the two sliders 10 can move along the length direction of the slide groove 9 while preventing the two sliders 10 from slipping out of the slide groove 9.

[0040] like Figure 3 , Figure 4 , Figure 5As shown, two movable plates 13 are vertically arranged at the position between the two sliders 10 in each slide groove 9, each movable plate 13 is slidably connected to the side wall of the slide groove 9, and the two ends of the guide rod 8 are respectively rotatably connected to the inner walls of the two ends of the slide groove 9, and the guide rod 8 passes through the two movable plates 13 and is threadedly connected to the two movable plates 13. The threads on the guide rod 8 close to the two movable plates 13 are in opposite directions, which is convenient for driving the two movable plates 13 to move by rotating the guide rod 8. At the same time, the distance between the two movable plates 13 is adjusted. An elastic member 11 is sleeved on the guide rod 8 at a position between each movable plate 13 and the adjacent slider 10, and the two ends of the elastic member 11 are respectively connected to the corresponding movable plate 13 and the corresponding slider 1 0 connection, one end of the guide rod 8 is connected with a rotating assembly, the rotating assembly is used to drive the guide rod 8 to rotate forward and backward, the guide rod 8 drives the two moving plates 13 to move, adjust the distance between the two moving plates 13, and adjust the distance between the two sliders 10 through the two moving plates 13, so as to adjust the distance between the top mounting bar 6 and the floating plate 1, the distance between two adjacent mounting bars 6, and the distance between the bottom mounting bar 6 and the counterweight plate 2, so that the distances between multiple current meters 3 from top to bottom can be adjusted in turn, so that the distances between two adjacent current meters 3 are different, and then when measuring the water flow velocity at different depths, the measuring depth can be adjusted as needed.

[0041] like Figure 3 , Figure 5 As shown, a partition plate 14 is vertically arranged between the two movable plates 13 , the edge of the partition plate 14 is fixedly connected to the inner wall of the slide groove 9 , and the guide rod 8 passes through the partition plate 14 and is rotatably connected to the partition plate 14 .

[0042] like Figure 6 , Figure 7 As shown, the rotating assembly includes a cavity 15, a first gear 16 and a rack 19. The cavity 15 is opened in the mounting strip 6. The cavity 15 is located close to one end of the guide rod 8. The end of the guide rod 8 is located in the cavity 15 and is rotatably connected to the inner wall of the cavity 15. The first gear 16 is sleeved on the guide rod 8. The rack 19 is horizontally arranged in the cavity 15. The rack 19 is located close to the first gear 16. The rack 19 is meshed with the first gear 16. Both ends of the rack 19 pass through the inner wall of the cavity 15 respectively and are located outside the mounting strip 6. The first gear 16 is driven to rotate by pulling the rack 19, and the first gear 16 drives the guide rod 8 to rotate.

[0043] like Figure 7As shown, first through holes 21 are respectively provided on two side surfaces of the mounting bar 6 near the positions of the rack 19, and the two first through holes 21 are both connected to the cavity 15. Both ends of the rack 19 pass through the two first through holes 21, respectively, so that the rack 19 can shuttle back and forth between the two first through holes 21, driving the first gear 16 to rotate forward and reversely. Stop blocks 20 are respectively provided at both ends of the rack 19, and the length of the stop block 20 is greater than the diameter of each first through hole 21, so as to prevent the rack 19 from passing through the two first through holes 21.

[0044] like Figure 4 As shown, each group of current meters 3 has four, which is convenient for measuring the water flow velocity at different positions at the same depth. Each mounting bar 6 is composed of a first connecting bar 601, two second connecting bars 602 and four connecting rings 603. The four current meters 3 are respectively arranged in the four connecting rings 603. The first connecting bar 601 and the two second connecting bars 602 are arranged between the four connecting rings 603 from left to right. The two second connecting bars 602 are located on both sides of the first connecting bar 601. The two ends of the first connecting bar 601 are respectively connected to the corresponding two connecting rings 603, and the two ends of each first connecting bar 601 are respectively connected to the corresponding two connecting rings 603. Each slide groove 9 is opened at the upper part of the first connecting bar 601.

[0045] like Figure 8 As shown, each current meter 3 is connected to the corresponding connecting ring 603 through a horizontally arranged rotating shaft, and a tail wing plate 7 is horizontally arranged at the tail end of each current meter 3. Each current meter 3 can swing up and down in the corresponding connecting ring 603 through the rotating shaft. The tail wing plate 7 can drive the current meter 3 to change with the flow direction of the water flow, so that the current meter 3 is parallel to the flow direction of the water flow, which is convenient for measuring the water flow velocity.

[0046] like Figure 1 , Figure 2 As shown, the lifting assembly includes two pull ropes 22, two first limiting cylinders 29 and a wire-winding assembly. The two pull ropes 22 are respectively arranged on both sides of the floating board 1. The lower end of each pull rope 22 is connected to the counterweight plate 2. The two first limiting cylinders 29 are respectively vertically arranged on both sides of the floating board 1 and are located close to the two pull ropes 22. Each pull rope 22 passes through the corresponding first limiting cylinder 29, which is convenient for limiting the two pull ropes 22 by the two first limiting cylinders 29, so that the movement of the two pull ropes 22 is more stable. The wire-winding assembly is arranged on the upper part of the floating board 1, and the wire-winding assembly is connected to the upper ends of the two pull ropes 22. The wire-winding assembly is used to release and reel in the two pull ropes 22, thereby driving the counterweight plate 2 to move up and down through the two pull ropes 22.

[0047] like Figure 2 , Fig. 9As shown, the wire-taking assembly includes a box body 4, two connecting shafts 24, two wire-taking drums 23, two second gears 23, a third gear 18 and a motor 5. The box body 4 is arranged on the upper part of the floating board 1. Second through holes 27 are respectively opened on both sides of the box body 4 near the two pull ropes 22. The upper end of each pull rope 22 passes through the corresponding second through hole 27 and is located in the box body 4. The two connecting shafts 24 are horizontally arranged in the box body 4. The positions of the two connecting shafts 24 are respectively close to the two second through holes 27. The two ends of each connecting shaft 24 are respectively rotatably connected to the inner wall of the box body 4. The two wire-taking drums 23 are respectively sleeved on the two connecting shafts 24. The upper end of each pull rope 22 is respectively The two second gears 23 are respectively wound on the corresponding wire-taking drums 23 and are connected in opposite directions. The two second gears 23 are respectively sleeved on the two connecting shafts 24. The third gear 18 is arranged between the two second gears 23. The third gear 18 is respectively meshed and connected with the two second gears 23. The motor 5 is arranged in the box body 4 and is located close to the third gear 18. The output end of the motor 5 is connected with the third gear 18. The motor 5 is started, and the motor 5 drives the third gear 18 to rotate. The third gear 18 drives the two second gears 23 to rotate in the same direction. The two second gears 23 drive the two wire-taking drums 23 to rotate in the same direction, so that the two wire-taking drums 23 can synchronously take up and release the two pull ropes 22.

[0048] like Fig. 9 As shown, a battery 25 is arranged inside the box 4 at a position away from the motor 5. The battery 25 is electrically connected to the motor 5, and the motor 5 is powered by the battery 25. At the same time, the weight of the motor 5 is balanced by the battery 25, so that the floating board 1 can float stably on the river surface.

[0049] like Figure 2 , Fig. 9 As shown, fixed pulleys 26 are respectively provided on the upper part of the floating board 1 near the two first limiting cylinders 29, and the two pull ropes 22 are respectively passed around the upper part of the two fixed pulleys 26, so that the winding and releasing operations of the pull ropes 22 are more stable.

[0050] like Figure 1 , Figure 2 As shown, a limit rod 28 is horizontally arranged between each outermost connecting ring 603 and the adjacent pull rope 22, one end of the limit rod 28 is connected to the corresponding connecting ring 603, and the other end of the limit rod 28 is connected to a second limit cylinder 30, the second limit cylinder 30 is vertically arranged, and the pull rope 22 passes through the first limit cylinder 30, and two second limit cylinders 30 are arranged at both ends of each mounting bar 6, so that each mounting bar 6 is more stable when moving up and down.

[0051] Working principle: When in use, the device is placed in water on the shore or on a boat, so that the counterweight plate 2 first contacts the river water, and then the motor 5 is started, the motor 5 drives the third gear 18 to rotate, the third gear 18 drives the two second gears 23 to rotate in the same direction, the two second gears 23 drive the two take-up drums 23 to rotate counterclockwise, so that the two take-up drums 23 release the two pull ropes 22 synchronously, the two pull ropes 22 are loosened, the counterweight plate 2 moves downward into the water under the action of gravity, and floats on the water surface under the action of buoyancy through the floating board 1. The counterweight plate 2 moves downward, and drives multiple mounting bars 6 to move downward in sequence from bottom to top through multiple groups of movable rods 12. The two sliders 10 at the lower ends of each group of movable rods 12 move toward each other, so that the angle between the two movable rods 12 becomes smaller, so that the distance between the top mounting bar 6 and the floating plate 1, the distance between two adjacent mounting bars 6, and the distance between the bottom mounting bar 6 and the counterweight plate 2 increase year by year until the counterweight plate 2 contacts the riverbed, and the water flow velocity at this depth is measured by the four flow meters 3 on each mounting bar 6.

[0052] At the same time, when it is necessary to adjust the depth of the measurement, before putting the device into the water, pull each rack 19 from top to bottom, the rack 19 drives the first gear 16 to rotate, the first gear 16 drives the guide rod 8 to rotate, the guide rod 8 drives the two movable plates 13 to move, and adjust the distance between the two movable plates 13. The distance between the two sliders 10 is adjusted through the two movable plates 13, thereby adjusting the distance between the top mounting bar 6 and the floating plate 1, the distance between the two adjacent mounting bars 6, and the distance between the bottom mounting bar 6 and the counterweight plate 2, so that the distances between multiple current meters 3 from top to bottom can be adjusted in turn, so that the distances between two adjacent current meters 3 are different. After the adjustment is completed, repeat the above steps.

[0053] It is to be understood that the present invention is described by some embodiments, and it is known to those skilled in the art that various changes or equivalent substitutions may be made to these features and embodiments without departing from the spirit and scope of the present invention. In addition, under the teachings of the present invention, these features and embodiments may be modified to adapt to specific circumstances and materials without departing from the spirit and scope of the present invention. Therefore, the present invention is not limited by the specific embodiments disclosed herein, and all embodiments falling within the scope of the claims of this application are within the scope of protection of the present invention.

Claims

1. A shallow river flow velocity measuring device, comprising a floating plate (1), a counterweight plate (2) being arranged on one side of the floating plate (1), characterized in that: Also includes: A plurality of mounting bars (6) are sequentially and spaced apart between the floating plate (1) and the counterweight plate (2), and each mounting bar (6) is parallel to the floating plate (1); A plurality of groups of flow meters (3) corresponding one to one with a plurality of mounting strips (6), and each group of flow meters (3) is arranged on a corresponding mounting strip (6); The spacing adjustment mechanism is arranged between the floating plate (1) and the counterweight plate (2) and is used to adjust the distance between the floating plate (1) and a nearby mounting bar (6), between two adjacent mounting bars (6), and between the counterweight plate (2) and a nearby mounting bar (6), so that the plurality of current meters (3) are located at different depths of the river.

2. The shallow river flow velocity measuring device according to claim 1, characterized in that: The spacing adjustment mechanism comprises: a plurality of telescopic components, wherein every two telescopic components are respectively arranged on both sides of each mounting bar (6), the floating plate (1) is connected to the adjacent mounting bar (6) via a telescopic component, two adjacent mounting bars (6) are connected via a telescopic component, and the counterweight plate (2) is connected to the adjacent mounting bar (6) via a telescopic component; and a lifting component connected to the counterweight plate (2) and used to drive the counterweight plate (2) to move up and down.

3. The shallow river flow velocity measuring device according to claim 2, characterized in that: Each telescopic assembly comprises: two movable rods (12), the two movable rods (12) are V-shaped, the angle ends of the two movable rods (12) close to the floating board (1) are respectively hinged to the floating board (1), the angle ends of the two movable rods (12) between two adjacent mounting strips (6) are respectively hinged to the mounting strips (6) close to the floating board (1), and the angle ends of the two movable rods (12) close to the counterweight plate (2) are respectively hinged to the corresponding mounting strips (6); two sliders (10) are respectively hinged to the other ends of the two movable rods (12), the two sliders (10) close to the floating board (1) are slidably connected to the corresponding mounting strips (6) along the length direction of the mounting strips (6), the two sliders (10) between two adjacent mounting strips (6) are slidably connected to the mounting strips (6) close to the counterweight plate (2) along the length direction of the mounting strips (6), and the two sliders (10) close to the counterweight plate (2) are slidably connected to the counterweight plate (2) along the length direction of the mounting strips (6).

4. The shallow river flow velocity measuring device according to claim 3, characterized in that: A slide groove (9) is provided at a position close to the two sliders (10) on each of the mounting bars (6) and at a position close to the two sliders (10) on the counterweight plate (2). The two sliders (10) are arranged in the corresponding slide grooves (9). A guide rod (8) is horizontally arranged in each of the slide grooves (9). The guide rod (8) passes through the corresponding two sliders (10) and is slidably connected to the two sliders (10).

5. The shallow river flow velocity measuring device according to claim 4, characterized in that: Two movable plates (13) are vertically arranged at a position between the two sliders (10) in each of the slide grooves (9), and each of the movable plates (13) is slidably connected to the side wall of the slide groove (9). The two ends of the guide rod (8) are respectively rotatably connected to the inner walls of the two ends of the slide groove (9). The guide rod (8) passes through the two movable plates (13) and is threadedly connected to the two movable plates (13). The threads on the guide rod (8) close to the two movable plates (13) are in opposite directions. An elastic member (11) is sleeved on the guide rod (8) at a position between each movable plate (13) and the adjacent slider (10). The two ends of the elastic member (11) are respectively connected to the corresponding movable plate (13) and the corresponding slider (10). One end of the guide rod (8) is connected to a rotating component, and the rotating component is used to drive the guide rod (8) to rotate forward and reverse.

6. The shallow river flow velocity measuring device according to claim 5, characterized in that: The rotating assembly comprises: a cavity (15) which is opened in the mounting strip (6) and is located close to one end of the guide rod (8), the end of the guide rod (8) is located in the cavity (15) and is rotatably connected to the inner wall of the cavity (15); a first gear (16) which is sleeved on the guide rod (8); a rack (19) which is horizontally arranged in the cavity (15) and is located close to the first gear (16), the rack (19) is meshedly connected to the first gear (16), and the two ends of the rack (19) respectively pass through the inner wall of the cavity (15) and are located outside the mounting strip (6).

7. The shallow river flow velocity measuring device according to claim 4, characterized in that: Each group of flow meters (3) has four, each of the mounting bars (6) is composed of a first connecting bar (601), two second connecting bars (602) and four connecting rings (603), the four flow meters (3) are respectively arranged in the four connecting rings (603), the first connecting bar (601) and the two second connecting bars (602) are arranged between the four connecting rings (603) from left to right, the two second connecting bars (602) are located on both sides of the first connecting bar (601), the two ends of the first connecting bar (601) are respectively connected to the corresponding two connecting rings (603), the two ends of each of the first connecting bars (601) are respectively connected to the corresponding two connecting rings (603), and each of the slide grooves (9) is opened at the upper part of the first connecting bar (601).

8. The shallow river flow velocity measuring device according to claim 7, characterized in that: Each of the current meters (3) is connected to a corresponding connecting ring (603) via a horizontally arranged rotating shaft, and a tail wing plate (7) is horizontally arranged at the tail end of each of the current meters (3).

9. The shallow river flow velocity measuring device according to claim 7, characterized in that: The lifting assembly comprises: two pull ropes (22), respectively arranged on both sides of the floating board (1), the lower end of each pull rope (22) being connected to the counterweight plate (2); two first limit cylinders (29), respectively arranged vertically on both sides of the floating board (1) and located close to the two pull ropes (22), each pull rope (22) passing through the corresponding first limit cylinder (29); and a wire-reeling assembly, arranged on the upper part of the floating board (1) and connected to the upper ends of the two pull ropes (22), the wire-reeling assembly being used for performing wire-releasing and wire-reeling operations on the two pull ropes (22).

10. The shallow river flow velocity measuring device according to claim 9, characterized in that: A limiting rod (28) is horizontally arranged between each of the outermost connecting rings (603) and the adjacent pull rope (22), one end of the limiting rod (28) is connected to the corresponding connecting ring (603), and the other end of the limiting rod (28) is connected to a second limiting cylinder (30), the second limiting cylinder (30) is vertically arranged, and the pull rope (22) passes through the second limiting cylinder (30).

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