A positioning and fixing device for a current meter used in hydrological survey

Abstract

The application discloses a flow velocity meter positioning and fixing device for hydrological surveying, relates to the technical field of hydrological surveying, and is characterized in that the outer side of a fixing column is fixedly connected with a fixing plate, the top of the fixing column is fixedly connected with a supporting plate, the side, away from the fixing column, of the supporting plate is fixedly connected with an adjusting arm and a tensioning arm respectively, the inner side of the adjusting arm is slidably provided with a positioning plate, the inner side of the tensioning arm is slidably provided with a tightening plate, the fixing plate is provided with a positioning assembly, and the positioning plate and the tightening plate are both provided with a fixing assembly. Through cooperation of the fixing assembly and the positioning assembly, the detection instrument main body can detect water flow velocities at different depths, the stability of the detection instrument main body in water can be ensured, the tightening effect of the tightening reel ensures that the position of the detection instrument main body in water always keeps a vertical state with the positioning reel, and the ability of the detection instrument main body to detect water velocities at different depths is improved.

Description

Technical Field

[0001] This invention relates to the field of hydrological surveying technology, and in particular to a positioning and fixing device for a current meter used in hydrological surveying. Background Technology

[0002] Hydrological surveying is a crucial technical activity involving the systematic collection and analysis of hydrological data. Its aim is to reveal information such as the flow patterns, water quality, and quantity changes of surface and groundwater. By establishing observation stations and using specialized equipment like current meters and water quality monitors, hydrological surveyors can measure and record key parameters of water bodies in real time, including flow velocity, flow rate, water level, water depth, and water quality indicators. This data is of paramount value for water conservancy project planning, water resource management, environmental protection, and disaster prevention and mitigation. Through hydrological surveying, we can better understand the distribution and utilization potential of water resources, providing strong support for formulating scientific and rational water resource policies and protection measures. Furthermore, hydrological surveying is an important means of preventing natural disasters such as floods and droughts, helping to reduce disaster losses and protect people's lives and property.

[0003] A search revealed that Chinese patent number CN114353759B discloses a flow direction detection device based on a flow velocity calibration vehicle. Compared with existing technologies, this Chinese patent number CN114353759B includes a detector body and a fixing mechanism. The fixing mechanism is located between the detector body and the connecting mechanism. The fixing mechanism consists of a mounting block, two U-shaped plates, a locking plate, and a plug rod. The U-shaped plates are positioned above the detector body, and the locking plate is slidably positioned on one side of the mounting block. The outer wall of the locking plate is slidably connected to the inner wall of the U-shaped plate. A plug hole is provided on one side of the locking plate, and the outer wall of the plug rod is movably inserted into the inner wall of the plug hole. This invention utilizes a mounting block, a U-shaped plate, a locking plate, and a plug rod. The locking plate slides on the mounting block, allowing it to insert into the U-shaped plate. The plug rod is then inserted into a hole on the locking plate to position it, thus mounting the detector body at the bottom of the mounting block. Disassembly is simple: just pull out the plug rod and slide the locking plate out of the U-shaped plate, thereby improving the ease of assembly and disassembly of the detector.

[0004] However, in actual use, the above-mentioned device has limited adjustment range of cylinder, making it difficult to perform multi-position detection according to water depth. At the same time, due to the influence of water eddies and cross currents during adjustment, the detector is unstable in the water, which may cause errors when detecting downstream water flow, resulting in inaccurate measurement results. Therefore, a positioning and fixing device for a current meter for hydrological survey is proposed. Summary of the Invention

[0005] The purpose of this invention is to overcome the shortcomings of existing technologies, such as difficulty in locating and detecting multiple positions and poor fixation of the detector in water, and to propose a positioning and fixing device for a current meter used in hydrological surveying.

[0006] To achieve the above objectives, the present invention adopts the following technical solution:

[0007] A positioning and fixing device for a current meter used in hydrological surveying includes a fixing column and a main body of the detector. A fixing plate is fixedly connected to the outer side of the fixing column, and the fixing plate is used to support the positioning components. A support plate is fixedly connected to the top of the fixing column, and the support plate is used to support an adjusting arm and a tensioning arm. An adjusting arm and a tensioning arm are fixedly connected to the side of the support plate away from the fixing column, respectively. The adjusting arm and the tensioning arm are used to support a positioning plate and a tightening plate. A positioning plate is slidably arranged on the inner side of the adjusting arm, and a tightening plate is slidably arranged on the inner side of the tensioning arm.

[0008] A positioning assembly is provided on the fixed plate. The positioning assembly includes a main motor, a first reel, and a second reel mounted on the fixed plate. The main motor drives the first and second reels. A transmission structure is provided between the main motor, the first reel, and the second reel for transmission among the three components. The transmission structure includes a first belt installed between the first reel and the main motor, which drives the first reel. A second belt is installed between the main motor and the second reel, which drives the second reel. The positioning assembly drives the first and second belts to rotate through the rotation of the main motor, thereby controlling the retraction and extension of the first and second reels. The retraction and extension of the first and second reels control the repeated movement of the positioning plate on the adjusting arm and the repeated movement of the tightening plate on the tensioning arm.

[0009] The positioning plate and the tightening plate are jointly provided with a fixing component. The fixing component includes a positioning motor and a positioning reel mounted on the positioning plate, and a tightening motor and a tightening reel mounted on the tightening plate. The positioning motor drives the positioning reel, and the tightening motor drives the tightening reel. The positioning reel and the tightening reel are fixedly connected to the main body of the detector. The fixing component controls the rotation of the positioning motor to drive the tightening and unwinding of the positioning reel, and controls the rotation of the tightening motor to drive the tightening and unwinding of the tightening reel. The tightening and unwinding of the positioning reel and the tightening reel achieve the tightening movement of the main body of the detector.

[0010] The above technical solution further includes:

[0011] The first spool, the second spool, and the main motor are all fixedly connected to the fixed plate. The output end of the main motor is fixedly connected to a rotating shaft. A first driving wheel and a large gear are fixedly connected to the outer side of the rotating shaft. The rotating shaft is used to drive the rotation of the first driving wheel and the large gear. A first driven wheel is fixedly connected to the end of the first spool near the first driving wheel. The first driving wheel and the first driven wheel are connected to the first belt. The rotation of the first driving wheel drives the first belt to rotate in a circular motion. The rotation of the first belt drives the first driven wheel to rotate. The rotation of the first driven wheel drives the first spool to unwind and rewind.

[0012] A fixing block is symmetrically fixed to the side of the fixing plate closest to the main motor. A rotating rod is rotatably connected between the two fixing blocks. A small gear is fixedly connected to the outer side of the rotating rod, which extends to the outer side of the fixing block and is close to the large gear. The small gear meshes with the large gear. The transmission ratio between the large gear and the small gear is less than 1, which achieves acceleration. Because the transmission ratio between the large gear and the small gear is less than 1, the tensioning arm is designed to have an angle with the adjusting arm. This allows the sliding speed of the tightening plate to be greater than the sliding speed of the positioning plate, so that the tightening plate and the positioning plate always maintain a relatively horizontal position.

[0013] The second driven wheel is fixedly connected to the side of the second reel near the large gear, and the second driving wheel is fixedly connected to the outside of the rotating rod. The second driving wheel is located between two fixed blocks. The second driving wheel and the second driven wheel are connected to the second belt. The rotation of the second driving wheel drives the second belt to rotate in a circular motion. The rotation of the second belt drives the second driven wheel to rotate. The rotation of the second driven wheel drives the second reel to wind up and down.

[0014] A first steel wire rope is movably connected to the outer side of the first reel, and a second steel wire rope is movably connected to the outer side of the second reel. The first and second steel wire ropes are used to pull the positioning plate and the tightening plate to move repeatedly.

[0015] The support plate is fixedly connected to a first guide wheel on the side closest to the fixed plate, and the adjusting arm is symmetrically fixedly connected to a third guide wheel on the side away from the support plate. The first guide wheel and the two third guide wheels are movably connected to the first wire rope. The first guide wheel and the third guide wheel are used to change the direction of the first wire rope.

[0016] The support plate is fixedly connected to a second guide wheel on the side closest to the fixed plate, and the tensioning arm is symmetrically fixedly connected to a fourth guide wheel on the side away from the support plate. The fourth guide wheel and the two second guide wheels are movably connected to the second wire rope. The second guide wheel, the fourth guide wheel, and the third guide wheel are used to change the direction of the second wire rope.

[0017] The inner side of the adjusting arm is fixedly connected to a first sliding rod, which is slidably connected to the positioning plate. The first wire rope is fixedly connected to the positioning plate, and the first sliding rod is used to assist in the guiding movement of the positioning plate.

[0018] A second slide rod is fixedly connected to the inner side of the tensioning arm. The second slide rod is slidably connected to the tensioning plate. The second wire rope is fixedly connected to the tensioning plate. The second slide rod is used to assist in guiding the movement of the tensioning plate.

[0019] The positioning motor is fixedly connected to the positioning reel, and the positioning motor and the positioning reel are both fixedly connected to the positioning plate. The tightening motor is fixedly connected to the tightening reel, and the tightening motor and the tightening reel are both fixedly connected to the tightening plate. Through the combined action of the tightening reel and the tightening plate, the position of the detector body in the water is always kept perpendicular to the positioning reel, thereby improving the detector body's ability to detect water velocities at different depths.

[0020] The present invention has the following beneficial effects:

[0021] 1. In this invention, by using the positioning component and the transmission component together, it is possible to ensure that the positioning positions of the tightening reel and the positioning reel remain relatively consistent when the detector body is searching for the detection position. This ensures that the detector body remains stable during the detection of water flow velocity, ensures that the detector body is parallel to the water flow direction, prevents the detector body from tilting in the river, reduces the impact of lateral water flow on the detector body, thereby improving the effect of the forward water flow on the detector body, and thus improving the accuracy of the detection data of the detector body.

[0022] 2. In this invention, the combination of the fixed component and the positioning component enables the detector body to detect water flow velocity at different depths, ensuring the stability of the detector body in the water. The tightening action of the tightening reel ensures that the position of the detector body in the water remains perpendicular to the positioning reel, thereby improving the detector body's ability to detect water velocity at different depths. Attached Figure Description

[0023] Figure 1 This is a schematic diagram of the first overall structure of a current meter positioning and fixing device for hydrological surveying proposed in this invention;

[0024] Figure 2 This is a schematic diagram of the second overall structure in the present invention;

[0025] Figure 3 This is a schematic diagram of the adjusting arm structure in this invention;

[0026] Figure 4 This is a schematic diagram of the positioning component structure in this invention;

[0027] Figure 5 This is a schematic diagram of the transmission structure in this invention;

[0028] Figure 6 This is a schematic diagram of the main structure of the testing instrument in this invention;

[0029] Figure 7 This is a schematic diagram of the positioning component structure in this invention.

[0030] In the diagram: 1. Fixed column; 2. Fixed plate; 3. Adjusting arm; 4. Tensioning arm; 5. Support plate; 6. Main body of the detector; 7. First reel; 8. Main motor; 9. First driven wheel; 10. First driving wheel; 11. First belt; 12. First wire rope; 13. Rotating shaft; 14. Large gear; 15. Second reel; 16. Second wire rope; 17. Small gear; 18. Fixed block; 19. Rotating rod; 20. Second driving wheel; 21. Second belt; 22. First sliding rod; 23. First guide wheel; 24. Second guide wheel; 25. Second sliding rod; 26. Tensioning plate; 27. Fourth guide wheel; 28. Tensioning motor; 29. ​​Positioning motor; 30. Tensioning reel; 31. Positioning reel; 32. Positioning plate; 33. Third guide wheel; 34. Second driven wheel. Detailed Implementation

[0031] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0032] Example 1

[0033] like Figures 1-7 As shown, the present invention proposes a positioning and fixing device for a current meter for hydrological survey, comprising a fixing column 1 and a detector body 6. A fixing plate 2 is fixedly connected to the outer side of the fixing column 1, and the fixing plate 2 is used to support the positioning components. A support plate 5 is fixedly connected to the top of the fixing column 1, and the support plate 5 is used to support the adjusting arm 3 and the tensioning arm 4. The adjusting arm 3 and the tensioning arm 4 are fixedly connected to the side of the support plate 5 away from the fixing column 1, respectively. The adjusting arm 3 and the tensioning arm 4 are used to support the positioning plate 32 and the tightening plate 26. The positioning plate 32 is slidably arranged on the inner side of the adjusting arm 3, and the tightening plate 26 is slidably arranged on the inner side of the tensioning arm 4.

[0034] A positioning assembly is provided on the fixed plate 2. The positioning assembly includes a main motor 8, a first reel 7, and a second reel 15 mounted on the fixed plate 2. The main motor 8 is used to drive the first reel 7 and the second reel 15. A transmission structure is provided between the main motor 8, the first reel 7, and the second reel 15. The transmission structure includes a first belt 11 installed between the first reel 7 and the main motor 8. The first belt 11 is used to drive the first reel 7. A second belt 21 is installed between the main motor 8 and the second reel 15. The second belt 21 is used to drive the second reel 15. The positioning assembly drives the first belt 11 and the second belt 21 to rotate through the rotation of the main motor 8, thereby controlling the opening and closing of the first reel 7 and the second reel 15. The opening and closing of the first reel 7 and the second reel 15 control the repeated movement of the positioning plate 32 on the adjusting arm 3 and the repeated movement of the tightening plate 26 on the tensioning arm 4, respectively.

[0035] The positioning plate 32 and the tightening plate 26 are both equipped with a fixing component. The fixing component includes a positioning motor 29 and a positioning reel 31 mounted on the positioning plate 32, and a tightening motor 28 and a tightening reel 30 mounted on the tightening plate 26. The positioning motor 29 drives the positioning reel 31, and the tightening motor 28 drives the tightening reel 30. The positioning reel 31 and the tightening reel 30 are fixedly connected to the main body 6 of the detector. The fixing component controls the rotation of the positioning motor 29 to drive the positioning reel 31 to move and the rotation of the tightening motor 28 to drive the tightening reel 30 to move and the tightening reel 30 to move and the tightening reel 31 to move and the tightening reel 30 to move and the tightening reel 30 to move and the tightening reel 31 to move and the tightening reel 30 to move and the tightening reel 30 to move and the tightening reel 30 to move and the tightening reel 30 to move and the tightening reel 6 of the detector are achieved.

[0036] The first reel 7, the second reel 15, and the main motor 8 are all fixedly connected to the fixed plate 2. The output end of the main motor 8 is fixedly connected to a rotating shaft 13. The outer side of the rotating shaft 13 is fixedly connected to a first driving wheel 10 and a large gear 14. The rotating shaft 13 is used to drive the rotation of the first driving wheel 10 and the large gear 14. The end of the first reel 7 near the first driving wheel 10 is fixedly connected to a first driven wheel 9. The first driving wheel 10 and the first driven wheel 9 are connected together to the first belt 11. The rotation of the first driving wheel 10 drives the first belt 11 to rotate in a circular motion. The rotation of the first belt 11 drives the first driven wheel 9 to rotate. The rotation of the first driven wheel 9 drives the first reel 7 to retract and extend.

[0037] Fixed blocks 18 are symmetrically fixed to the side of the fixed plate 2 closest to the main motor 8. A rotating rod 19 is rotatably connected between the two fixed blocks 18. A small gear 17 is fixedly connected to the outer side of the rotating rod 19, which extends to the outer side of the fixed block 18 and is close to the large gear 14. The small gear 17 meshes with the large gear 14. Since the transmission ratio between the large gear 14 and the small gear 17 is less than 1, the tensioning arm 4 is designed to have an angle with the adjusting arm 3. This allows the sliding speed of the tightening plate 26 to be greater than the sliding speed of the positioning plate 32, so that the tightening plate 26 and the positioning plate 32 always maintain a relatively horizontal position.

[0038] The second driven wheel 34 is fixedly connected to the side of the second reel 15 near the large gear 14. The second driving wheel 20 is fixedly connected to the outside of the rotating rod 19. The second driving wheel 20 is located between the two fixed blocks 18. The second driving wheel 20 and the second driven wheel 34 are connected to the second belt 21. The rotation of the second driving wheel 20 drives the second belt 21 to rotate. The rotation of the second belt 21 drives the second driven wheel 34 to rotate. The rotation of the second driven wheel 34 drives the second reel 15 to retract and extend.

[0039] In this embodiment, during use, the operator first needs to determine the location of the water area to be measured. Then, by controlling the rotation of the main motor 8, the rotation of the main motor 8 drives the rotation of the first drive wheel 10, which in turn drives the movement of the first belt 11. The circular motion of the first belt 11 drives the rotation of the first driven wheel 9, which is fitted with it. The rotation of the first driven wheel 9 drives the rotation of the first reel 7, which in turn drives the winding and unwinding of the first wire rope 12. The design of the first wire rope 12 is that both ends are fitted on the first reel 7. When one end is unwinding, the other end is winding up. Therefore, under the guidance of the first guide wheel 23 and the two third guide wheels 33, the first wire rope 12 pulls the positioning plate 32 to slide back and forth along the guidance of the first slide rod 22, thereby positioning according to the determined measurement position.

[0040] In the above process, the rotation of the main motor 8 drives the rotation of the rotating shaft 13, which in turn drives the rotation of the large gear 14. The rotation of the large gear 14 drives the rotation of the meshing small gear 17, which in turn drives the rotation of the rotating rod 19. The two fixed blocks 18 provide support for the rotating rod 19. The rotation of the rotating rod 19 drives the rotation of the second driving wheel 20, which in turn drives the circular motion of the second belt 21. As the second belt 21 moves, it drives the movement of the second driven wheel 34. Since the large gear 14 drives the small gear 17, similarly, the second driven wheel 34 drives the second wire rope 16 to wind up and down during rotation, thereby enabling the tightening plate 26 to slide along the second slide bar 25 under the guidance of the tensioning arm 4. Since the transmission ratio between the large gear 14 and the small gear 17 is less than 1, the tensioning arm 4 is designed to have an angle with the adjusting arm 3. This allows the sliding speed of the tightening plate 26 to be greater than the sliding speed of the positioning plate 32, so that the tightening plate 26 and the positioning plate 32 always maintain a relatively horizontal position.

[0041] In the above process, it can be ensured that the positioning plates 32 and 26 of the detector body 6 remain relatively consistent when searching for the detection position, ensuring that the detector body 6 remains stable during the detection of water flow velocity, ensuring that the detector body 6 is parallel to the water flow direction, preventing the detector body 6 from tilting in the river, reducing the impact of lateral water flow on the detector body 6, thereby improving the effect of the forward water flow on the detector body 6, and thus improving the accuracy of the detection data of the detector body 6.

[0042] Example 2

[0043] like Figures 1-7 As shown, based on Embodiment 1, a first steel wire rope 12 is movably connected to the outer side of the first reel 7, and a second steel wire rope 16 is movably connected to the outer side of the second reel 15. The first steel wire rope 12 and the second steel wire rope 16 are respectively used to pull the positioning plate 32 and the tightening plate 26 to move repeatedly.

[0044] The support plate 5 is fixedly connected to the side near the fixed plate 2 with a first guide wheel 23, and the adjusting arm 3 is fixedly connected to the side away from the support plate 5 with a third guide wheel 33. The first guide wheel 23 and the two third guide wheels 33 are connected to the first wire rope 12 in a movable groove. The first guide wheel 32 and the third guide wheel 33 are used to change the direction of the first wire rope 12.

[0045] The support plate 5 is fixedly connected to the side near the fixed plate 2 with a second guide wheel 24, and the tensioning arm 4 is fixedly connected to the side away from the support plate 5 with a fourth guide wheel 27. The fourth guide wheel 27 and the two second guide wheels 24 are movably connected to the second wire rope 16. The second guide wheel and the fourth guide wheel are used to change the direction of the second wire rope 16.

[0046] The inner side of the adjusting arm 3 is fixedly connected to a first slide rod 22, which is slidably connected to the positioning plate 32. The first wire rope 12 is fixedly connected to the positioning plate 32. The first slide rod 22 is used to assist the guiding movement of the positioning plate 32.

[0047] The inner side of the tensioning arm 4 is fixedly connected to a second slide rod 25, which is slidably connected to the tensioning plate 26. The second wire rope 16 is fixedly connected to the tensioning plate 26. The second slide rod 25 is used to assist in the guiding movement of the tensioning plate 26.

[0048] The positioning motor 29 is fixedly connected to the positioning reel 31. The positioning motor 29 and the positioning reel 31 are together fixedly connected to the positioning plate 32. The tightening motor 28 is fixedly connected to the tightening reel 30. The tightening motor 28 and the tightening reel 30 are together fixedly connected to the tightening plate 26. Through the combined action of the tightening reel 30 and the tightening plate 26, the position of the detector body 6 in the water is always kept perpendicular to the positioning reel, thereby improving the ability of the detector body 6 to detect water velocities at different depths.

[0049] In this embodiment, when detecting the inflow and outflow velocities at different water depths, the water flow velocities vary at different depths. When the positioning motor 29 is rotated and the positioning reel 31 is released, the detector body 6 is placed in the water under gravity. Due to the water flow, the detector body 6 will move with the water flow, causing its position to shift. When the detector body 6 shifts in position in the water, it will be affected by lateral water flow or eddies, leading to further shifting and poor detection results. Therefore, by rotating the tightening motor 28 and controlling the tightening reel 30, a force in the same direction as the water flow is applied to the detector body 6, causing it to return to its original position, i.e., to be in the same vertical plane as the adjusting arm 3.

[0050] In the above process, the detector body 6 can detect the water flow velocity at different depths, and the detector body 6 can maintain a stable effect in the water. Through the tightening action of the tightening coil 30, the position of the detector body 6 in the water is always kept perpendicular to the positioning coil 31, thereby improving the ability of the detector body 6 to detect water velocity at different depths.

[0051] Although embodiments of the invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A positioning and fixing device for a current meter used in hydrological surveying, comprising a fixing column (1) and a main body of the detector (6), characterized in that, A fixing plate (2) is fixedly connected to the outer side of the fixing column (1), and a support plate (5) is fixedly connected to the top of the fixing column (1). An adjusting arm (3) and a tensioning arm (4) are fixedly connected to the side of the support plate (5) away from the fixing column (1). A positioning plate (32) is slidably provided on the inner side of the adjusting arm (3), and a tightening plate (26) is slidably provided on the inner side of the tensioning arm (4). A positioning component is provided on the fixed plate (2). The positioning component includes a main motor (8), a first coil (7), and a second coil (15) installed on the fixed plate (2). A transmission structure is provided between the main motor (8), the first coil (7), and the second coil (15). The transmission structure includes a first belt (11) installed between the first coil (7) and the main motor (8), and a second belt (21) installed between the main motor (8) and the second coil (15). The positioning component drives the first belt (11) and the second belt (21) to rotate through the rotation of the main motor (8), thereby controlling the opening and closing of the first coil (7) and the second coil (15). The opening and closing of the first coil (7) and the second coil (15) control the repeated movement of the positioning plate (32) on the adjusting arm (3) and the repeated movement of the tightening plate (26) on the tensioning arm (4). The positioning plate (32) and the tightening plate (26) are jointly provided with a fixing component. The fixing component includes a positioning motor (29) and a positioning reel (31) installed on the positioning plate (32), and a tightening motor (28) and a tightening reel (30) installed on the tightening plate (26). The positioning reel (31) and the tightening reel (30) are fixedly connected to the main body of the detector (6). The fixing component controls the rotation of the positioning motor (29) to drive the positioning reel (31) to move and the rotation of the tightening motor (28) to drive the tightening reel (30) to move and the tightening reel (30) to move and the tightening motion of the main body of the detector (6) is realized through the movement of the positioning reel (31) and the tightening reel (30).

2. The positioning and fixing device for a current meter used in hydrological surveying according to claim 1, characterized in that, The first spool (7), the second spool (15) and the main motor (8) are all fixedly connected to the fixed plate (2). The output end of the main motor (8) is fixedly connected to a rotating shaft (13). The outer side of the rotating shaft (13) is fixedly connected to a first driving wheel (10) and a large gear (14). The end of the first spool (7) near the first driving wheel (10) is fixedly connected to a first driven wheel (9). The first driving wheel (10) and the first driven wheel (9) are connected together to the first belt (11).

3. The positioning and fixing device for a current meter used in hydrological surveying according to claim 2, characterized in that, A fixing block (18) is symmetrically fixed to the side of the fixing plate (2) near the main motor (8). A rotating rod (19) is rotatably connected between the two fixing blocks (18). A small gear (17) is fixedly connected to the outer side of the rotating rod (19) extending to the outer side of the fixing block (18) and near the large gear (14). The small gear (17) meshes with the large gear (14).

4. The positioning and fixing device for a current meter used in hydrological surveying according to claim 3, characterized in that, The second driven wheel (34) is fixedly connected to the side of the second reel (15) near the large gear (14), and the second driving wheel (20) is fixedly connected to the outside of the rotating rod (19). The second driving wheel (20) is located between two fixed blocks (18), and the second driving wheel (20) and the second driven wheel (34) are connected together to the second belt (21).

5. A positioning and fixing device for a current meter used in hydrological surveying according to claim 1, characterized in that, The outer side of the first reel (7) is movably connected to a first wire rope (12), and the outer side of the second reel (15) is movably connected to a second wire rope (16).

6. A positioning and fixing device for a current meter used in hydrological surveying according to claim 5, characterized in that, The support plate (5) is fixedly connected to the side of the fixed plate (2) with a first guide wheel (23) and the adjusting arm (3) is fixedly connected to the side of the support plate (5) with a third guide wheel (33) symmetrically. The first guide wheel (23) and the two third guide wheels (33) are movably connected to the first wire rope (12).

7. A positioning and fixing device for a current meter used in hydrological surveying according to claim 5, characterized in that, The support plate (5) is fixedly connected to the side of the fixed plate (2) with a second guide wheel (24), and the tensioning arm (4) is fixedly connected to the side away from the support plate (5) with a fourth guide wheel (27). The fourth guide wheel (27) and the two second guide wheels (24) are movably connected to the second wire rope (16).

8. A positioning and fixing device for a current meter used in hydrological surveying according to claim 5, characterized in that, The inner side of the adjusting arm (3) is fixedly connected to a first slide rod (22), the first slide rod (22) is slidably connected to the positioning plate (32), and the first wire rope (12) is fixedly connected to the positioning plate (32).

9. A positioning and fixing device for a current meter used in hydrological surveying according to claim 5, characterized in that, The inner side of the tensioning arm (4) is fixedly connected to a second slide rod (25), the second slide rod (25) is slidably connected to the tensioning plate (26), and the second wire rope (16) is fixedly connected to the tensioning plate (26).

10. A positioning and fixing device for a current meter used in hydrological surveying according to claim 1, characterized in that, The positioning motor (29) is fixedly connected to the positioning reel (31), and the positioning motor (29) and the positioning reel (31) are fixedly connected to the positioning plate (32). The tightening motor (28) is fixedly connected to the tightening reel (30), and the tightening motor (28) and the tightening reel (30) are fixedly connected to the tightening plate (26).

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