Portable field surface river flow measuring device

Abstract

The utility model discloses a portable field surface river flow measuring device which comprises a floating body, a detection device, a liquid level detection device, a stability maintaining mechanism, a speed measuring device, a wireless transmission device and a ground base station, and the stability maintaining mechanism comprises a multi-section telescopic rod, an underwater electric push rod, a driving motor, a winding wheel and a load bearing piece. The detection device is mounted on the floating body, so that the cross section of the river channel can be detected; the data of the positions of the floating bodies at the n moments in the river measurement section are selected as samples, the average flow of the river in the measurement section is calculated, the average flow of the river in the measurement section serves as the flow of the river, measurement errors can be reduced, and the measurement precision is improved; by arranging the stability maintaining mechanism, the floating body can be more easily kept in a vertical state in water, and meanwhile the influence that the floating body is pushed by wind is reduced; the multi-section telescopic rod and the heavy piece can increase the contact area with water areas at different positions, and the flow measurement precision can be improved; obstacles can be avoided by driving the multi-section telescopic rod to contract and rotate.

Description

Technical Field

[0001] The utility model relates to the technical field of river flow velocity measurement, in particular to a portable field surface river flow measurement device. Background Art

[0002] In hydrogeological survey, especially in hydrogeology, it is necessary to measure the flow velocity and flow rate of surface rivers to obtain the relationship between surface water and groundwater recharge, runoff and discharge. The common measurement methods for surface river flow velocity and flow rate in existing hydrogeological surveys are methods such as the float method, triangular weir, and rectangular weir.

[0003] The patent with the publication number CN110954069B discloses a river cross-section penetration type precise flow measurement device and method. The device includes a driving motor and a wire reel, a pulley orientation measurement device capable of precisely measuring the wire length, a wire anti-sway structure, a declination and inclination correction device, a water depth measurement device, and a flow velocity measurement device. The driving motor of the device drives the wire reel to rotate for lowering and recovering movements. After the wire passes through the pulley orientation measurement device and the wire anti-sway structure at the top, the water depth measurement device and the flow velocity measurement device are loaded for penetration type measurement work. However, the above device is suitable for detecting at a fixed-position river cross-section, and it is also necessary to have obtained the river cross-section information during detection, and it is not suitable for carrying to the field for flow measurement operations of unknown rivers.

[0004] The patent with the publication number CN118518900A discloses a float flow measurement device and method based on RISCV, including a float detection terminal and a cloud server. The float detection terminal includes a spherical outer shell, a microcontroller encapsulated in the outer shell, a data acquisition module electrically connected to the microcontroller, and a communication module. The data acquisition module is used to send position information to the microcontroller. The microcontroller is used to use the position information and time stamp as detection data, and send the detection data to the cloud server through the communication module; the cloud server is used to store, view and export the detection data, analyze the movement trajectory of the float detection terminal based on the position information and time stamp to form a trajectory map, and is used to calculate the flow velocity of the river by the float method based on the weight of the float detection terminal and the cross-sectional flow area of the river where it is located. However, the float detection terminal of the above device uses a spherical outer shell as the float seat to float on the river, which is greatly affected by the wind, cannot move stably along the water flow path, and is easily deviated from the normal measurement path due to factors such as water flow turbulence or local vortices. Moreover, due to the different flow velocities at different positions in the river width direction, on the premise of keeping the overall volume appropriate, the spherical outer shell cannot contact the water flow in the river width direction as much as possible, affecting its detection accuracy.

[0005] In summary, it is necessary to develop a portable field surface river flow measurement device. Summary of the Utility Model

[0006] Based on this, it is necessary to provide a portable field surface river flow measurement device for the above technical problems.

[0007] To achieve the above object, the utility model provides a portable field surface river flow measurement device, including a floating body capable of floating on water, with a cavity inside the floating body, and further including:

[0008] A detection device, installed at the bottom of the floating body and used for scanning the river channel contour;

[0009] A liquid level detection device, installed on the floating body and used for detecting the river liquid level;

[0010] A stability maintenance mechanism, used to maintain the stability of the floating body when drifting in water, including a hollow multi-section telescopic rod, an underwater electric push rod, a driving motor, a winding wheel, and a load-bearing member. Two multi-section telescopic rods and two underwater electric push rods are hinged at the bottom of the floating body. A load-bearing member is installed at the lower end of the multi-section telescopic rod. The multi-section telescopic rods and the underwater electric push rods are in one-to-one correspondence. The output end of the underwater electric push rod is hinged to the corresponding multi-section telescopic rod. The driving motor is fixedly installed in the cavity, the winding wheel is rotatably installed in the cavity, two winding wheels are provided and are in one-to-one correspondence with the multi-section telescopic rods. A pull rope is wound and installed on the winding wheel. An opening communicating with the cavity is provided at the bottom of the floating body. The free end of the pull rope passes through the opening and the inner cavity of the multi-section telescopic rod and is connected to the bottom end of the multi-section telescopic rod. The driving motor drives the two winding wheels to rotate, and the rotation directions of the two winding wheels are set to be opposite; the vertical average velocity can be approximately measured

[0011] A speed measurement device, used to detect the floating speed of the floating body on water;

[0012] A wireless transmission device, installed in the cavity;

[0013] The ground base station is communicatively connected to the detection device, the liquid level detection device, and the speed measurement device;

[0014] Among them, the ground base station constructs a three-dimensional cross-section of the river channel according to the scanning information of the detection device, and takes the data of the positions of the floating body at n moments in the river measurement section as samples. According to the river liquid level information detected by the liquid level detection device, the cross-sectional area Si of the river channel at the sample position of the floating body is calculated. According to the floating speed of the floating body detected by the speed measurement device, the river flow velocity Vi at the sample position of the floating body is calculated, the river flow rate Qi at the sample position of the floating body is calculated, and the average river flow rate of the measurement section is calculated as Q＝( ∑ Q i ) / n , where Qi = Vi * Si, 1 ≤ i ≤ n.

[0015] Preferably, the stability maintaining mechanism further includes a take-up reel, a guide shaft, guide wheels, and take-up gears. There are two take-up reels and two guide shafts. The take-up reels and the guide shafts are rotatably installed in the cavity. The take-up reels correspond to the take-up wheels one by one, and the take-up wheels are fixed on the corresponding take-up reels. Take-up gears are installed on the take-up reels, and the two take-up gears are meshed and connected. The drive motor is connected to one of the take-up reels through a coupling. Guide wheels are installed on the guide shafts, and the guide wheels correspond to the take-up wheels one by one. The ropes on the take-up wheels pass around the guide wheels and then pass through the openings.

[0016] Preferably, a sealing ring is installed at the opening, and the rope is sealingly connected to the sealing ring.

[0017] Preferably, an underwater 360° camera is installed at the bottom of the floating body, and the underwater 360° camera is communicatively connected to the ground base station through a wireless transmission device.

[0018] Preferably, a storage battery is installed in the cavity, and the storage battery is electrically connected to the detection device, the liquid level detection device, the drive motor, the underwater electric push rod, and the wireless transmission device.

[0019] Preferably, a threaded sleeve is fixed on the weight member, and the bottom of the multi-section telescopic rod is provided with an external thread. The multi-section telescopic rod is threadedly connected to the threaded sleeve through the external thread.

[0020] Preferably, a cover plate for sealing and covering the cavity is provided at the upper end of the floating body, and the cover plate is detachably connected to the floating body through bolts.

[0021] Preferably, a gusset plate is fixed at the bottom of the floating body. A round hole for a pin shaft to pass through is radially opened at the top of the multi-section telescopic rod. The multi-section telescopic rod is hinged to the gusset plate through the pin shaft passing through the round hole.

[0022] Preferably, a vertical plate is fixed at the bottom of the floating body, and the installation end of the underwater electric push rod is hingedly installed on the vertical plate.

[0023] Preferably, the speed measuring device is a radar speedometer.

[0024] Compared with the prior art, the technical solution of the present invention has at least the following beneficial effects: By installing a detection device on the floating body, the river cross-section can be detected; By selecting the data of the positions of the floating body at n moments in the river measurement section as samples, the average flow rate of the river in the measurement section is calculated, and the average flow rate of the river in the measurement section is used as the flow rate of the river, which can reduce measurement errors and improve measurement accuracy;

[0025] By setting up a stability maintaining mechanism, the floating body can be more easily kept in a vertical state in the water, and at the same time, the influence of the floating body being pushed by the wind can be reduced;

[0026] By setting the driving motor to unwind the pulling rope, the multi-section telescopic rod can be driven to drive the load-bearing member to descend, enabling it to fully contact waters with different water depths, approximately measuring the average velocity of the river vertical line, making the moving speed of the floating body closer to the true flow velocity of the river, and improving the flow measurement accuracy;

[0027] By driving the multi-section telescopic rod to rotate outward through the underwater electric push rod, the multi-section telescopic rod and the load-bearing member can contact the water flow in different regions in the river width direction, making the floating speed of the flow measurement device closer to the average flow velocity of the whole river and improving the detection accuracy;

[0028] Through the detection device and the underwater 360° camera, the position of the obstacles on the floating path can also be judged, facilitating the contraction of the multi-section telescopic rod driven by the driving motor or the rotation of the multi-section telescopic rod driven by the underwater electric push rod to avoid obstacles. Description of the Drawings

[0029] Figure 1 It is a structural schematic diagram of a portable outdoor surface river flow measurement device according to an embodiment of the present invention;

[0030] Figure 2 It is a side view cross-sectional view of a portable outdoor surface river flow measurement device according to an embodiment of the present invention;

[0031] Figure 3 It is a partial cross-sectional view of the connection between the floating body and the stability maintenance mechanism;

[0032] Figure 4 It is a working state diagram of the structural schematic diagram of a portable outdoor surface river flow measurement device according to an embodiment of the present invention;

[0033] In the figure, 1. floating body; 11. cavity; 12. cover plate; 13. ear plate; 14. pin shaft; 2. detection device; 3. liquid level detection device; 4. stability maintenance mechanism; 401. multi-section telescopic rod; 402. underwater electric push rod; 403. driving motor; 404. winding wheel; 405. load-bearing member; 406. pulling rope; 407. winding shaft; 408. guide shaft; 409. guide wheel; 410. winding gear; 411. sealing ring; 412. threaded sleeve; 413. ear plate; 414. pin shaft; 415. vertical plate; 5. speed measurement device; 6. wireless transmission device; 7. ground base station; 8. underwater 360° camera; 9. storage battery. Detailed Embodiment

[0034] In order to make the above-mentioned objects, features, and advantages of the present utility model more obvious and understandable, the following will describe in detail the specific embodiments of the present utility model with reference to the accompanying drawings. Many specific details are set forth in the following description in order to fully understand the present utility model. However, the present utility model can be implemented in many other ways different from those described herein, and those skilled in the art can make similar improvements without departing from the connotation of the present utility model. Therefore, the present utility model is not limited by the specific embodiments disclosed below.

[0035] Please refer to Figures 1 to 4 , the embodiment of the present application provides a portable field surface river flow measurement device, which includes a floating body 1 that can float on water. A cavity 11 is provided inside the floating body 1. The device further includes a detection device 2, a liquid level detection device 3, a stability maintenance mechanism 4, a speed measurement device 5, a wireless transmission device 6, and a ground base station 7;

[0036] Among them, the detection device 2 is installed at the bottom of the floating body 1 and is used to scan the river channel contour; the detection device 2 is a radar detection device 2, a sonar detection device 2, etc., which can detect the river channel contour by emitting signals to the river channel and receiving the reflected signals;

[0037] The liquid level detection device 3 is installed on the floating body 1 and is used to detect the river liquid level; the liquid level detection device 3 selects a radar level gauge and is installed at the upper end tail of the floating body 1 through a mounting bracket;

[0038] The stability maintenance mechanism 4 is used to maintain the stability of the floating body 1 when drifting in water, and includes a hollow multi-section telescopic rod 401, an underwater electric push rod 402, a drive motor 403, a winding wheel 404, and a weight member 405. Two multi-section telescopic rods 401 and two underwater electric push rods 402 are hinged to the bottom of the floating body 1. The underwater electric push rod 402 has a certain waterproof function and can operate normally underwater. The multi-section telescopic rod 401 is a multi-section telescopic rod with a hollow multi-section structure in the prior art and can be telescoped under the action of an external force. A weight member 405 is installed at the lower end of the multi-section telescopic rod 401. The weight member 405 is a smooth sphere with a density much greater than that of water. The multi-section telescopic rods 401 correspond to the underwater electric push rods 402 one by one. The output end of the underwater electric push rod 402 is hinged to the corresponding multi-section telescopic rod 401. The drive motor 403 is fixedly installed in the cavity 11. The drive motor 403 is a stepping motor. The winding wheel 404 is rotatably installed in the cavity 11. Two winding wheels 404 are provided and correspond to the multi-section telescopic rods 401 one by one. A pulling rope 406 is wound on the winding wheel 404. An opening communicating with the cavity 11 is provided at the bottom of the floating body 1. The free end of the pulling rope 406 passes through the opening and the inner cavity of the multi-section telescopic rod 401 and is connected to the inner wall of the lowermost telescopic rod of the multi-section telescopic rod 401. The drive motor 403 drives the two winding wheels 404 to rotate, and the rotation directions of the two winding wheels 404 are set to be opposite. By driving the winding wheels 404 to rotate through the drive motor 403, the two winding wheels 404 simultaneously pay out or wind up the pulling rope 406. When the pulling rope 406 is paid out, the multi-section telescopic rod 401 extends and drives the weight member 405 to descend. When the pulling rope 406 is wound up, the multi-section telescopic rod 401 contracts and drives the weight member 405 to ascend. By driving the multi-section telescopic rod 401 to rotate outward through the underwater electric push rod 402, the two underwater electric push rods 402 work synchronously, which can avoid the center of gravity of the measuring device from shifting;

[0039] To facilitate the drive motor 403 to drive the two winding wheels 404 to rotate, it is provided that the stability maintenance mechanism 4 further includes a winding shaft 407, a guide shaft 408, a guide wheel 409, and a winding gear 410. Two winding shafts 407 and two guide shafts 408 are provided. The winding shaft 407 and the guide shaft 408 are both rotatably installed in the cavity 11. The winding shafts 407 correspond to the winding wheels 404 one by one. The winding wheels 404 are fixedly installed on the corresponding winding shafts 407. Winding gears 410 are installed on the winding shafts 407. The two winding gears 410 are meshed and connected. The drive motor 403 is connected to one of the winding shafts 407 through a coupling. Guide wheels 409 are installed on the guide shafts 408. The guide wheels 409 correspond to the winding wheels 404 one by one. The pulling rope 406 on the winding wheel 404 bypasses the guide wheel 409 and then passes through the opening. The guide wheel 409 plays a guiding role for the pulling rope 406, so that when the underwater electric push rod 402 drives the multi-section telescopic rod 401 to tilt, the winding wheel 404 can still smoothly pay out and wind up the pulling rope 406;

[0040] The speed measurement device 5 is used to detect the floating speed of the floating body 1 on the water;

[0041] The wireless transmission device 6 is installed in the cavity 11;

[0042] The ground base station 7 is communicatively connected to the detection device 2, the liquid level detection device 3, and the speed measurement device 5; in this embodiment, the speed measurement device 5 is a radar speedometer, which can be a handheld radar speedometer or a radar speedometer fixed on the ground. The ground base station 7 is specifically a controller with a display screen capable of receiving and transmitting wireless signals. The speed measurement device 5 and the ground base station 7 are both set on the river bank during operation. The radar speedometer judges the speed of the floating body 1 by emitting signals to the floating body 1 and according to the reflected signals of the floating body 1. The speed measurement device 5 is communicatively connected to the ground base station 7 through a data line, and the ground base station 7 is wirelessly communicatively connected to the detection device 2 and the liquid level detection device 3 through the wireless transmission device 6; in other embodiments, the speed measurement device 5 can also be a GNSS device. When the speed measurement device 5 is a GNSS device, it is installed on the floating body 1. The ground base station 7 calculates the moving speed of the floating body 1 by obtaining the position signals sent by the GNSS device;

[0043] Among them, the ground base station 7 constructs a three-dimensional cross-section of the river according to the scanning information of the detection device 2, and uses the data of the positions of the floating body 1 at n moments selected in the river measurement section as samples. According to the river liquid level information detected by the liquid level detection device 3, it calculates the cross-sectional area Si of the river at the sample position of the floating body 1, calculates the river flow velocity Vi at the sample position of the floating body 1 according to the floating speed of the floating body 1 detected by the speed measurement device 5, calculates the river flow rate Qi at the sample position of the floating body 1, and calculates the average river flow rate in the measurement section as Q＝( ∑ Q i ) / n , where Qi = Vi * Si, 1 ≤ i ≤ n, and i is a positive integer.

[0044] Through the detection device 2 and the ground base station 7, the flow measurement operation of the unknown river cross-section data in the wild can be realized. By using the data of the positions of the floating body 1 at n moments selected in the river measurement section as samples, the average river flow rate in the measurement section is calculated, and the average river flow rate in the measurement section is used as the river flow rate. Compared with the river cross-section flow rate at a single position, the measurement error can be reduced and the measurement accuracy can be improved.

[0045] By setting the stability maintenance mechanism 4, the buoy can be more easily kept vertical in the water, and at the same time, the influence of the wind on pushing the floating body 1 can be reduced;

[0046] By setting up the multi - section telescopic rod 401 and the load - bearing member 405, driving the winding wheel 404 to rotate through the driving motor 403, and unwinding the pulling rope 406, the multi - section telescopic rod 401 extends and drives the load - bearing member 405 to descend. The multi - section telescopic rod 401 and the load - bearing member 405 can fully contact the water areas with different water depths, and can approximately measure the average velocity of the river vertical line, making the moving speed of the floating body 1 closer to the true flow velocity of the river and improving the flow measurement accuracy. By driving the multi - section telescopic rod 401 to rotate outward through the underwater electric push rod 402, the multi - section telescopic rod 401 and the load - bearing member 405 can contact the water flows in different regions in the river width direction, making the floating speed of the flow measurement device closer to the average flow velocity of the whole river and improving the detection accuracy. According to the river channel contour detected by the detection device 2, the position of the obstacles on the floating path can also be judged, which is convenient for driving the multi - section telescopic rod 401 to contract through the driving motor 403 or driving the multi - section telescopic rod 401 to rotate through the underwater electric push rod 402 to avoid obstacles.

[0047] In one embodiment, to prevent water from entering the cavity 11 through the opening, please refer to Figure 4 , a sealing ring 411 is installed at the opening, and the pulling rope 406 is hermetically connected to the sealing ring 411. When the pulling rope 406 is wound or unwound, it is in close contact with the sealing ring 411 to maintain the seal and prevent water from entering the cavity 11.

[0048] In one embodiment, to facilitate observing the underwater environment, please refer to Figure 2 , an underwater 360° camera 8 is installed at the bottom of the floating body 1. The underwater 360° camera 8 is communicatively connected to the ground base station 7 through a wireless transmission device 6. The ground base station 7 has a display screen, and the captured images of the underwater 360° camera 8 can be observed through the display screen. The ground base station 7 can also transmit signals to the underwater 360° camera 8 through the wireless transmission device 6 to control the rotation of the underwater 360° camera 8, facilitating the observation of images from different angles. Furthermore, it can be judged whether there are obstacles in front of the floating trajectory and the position of the obstacles, which is convenient for driving the multi - section telescopic rod 401 to contract through the driving motor 403 or driving the multi - section telescopic rod 401 to rotate through the underwater electric push rod 402 to avoid obstacles.

[0049] In one embodiment, to facilitate power supply to each electrical component on the floating body 1, please refer to Figure 2 , a storage battery 9 is installed in the cavity 11. The storage battery 9 is electrically connected to the detection device 2, the liquid level detection device 3, the driving motor 403, the underwater electric push rod 402, and the wireless transmission device 6.

[0050] In one embodiment, to facilitate the removal of the load - bearing member 405 from the multi - section telescopic rod 401, making the device more portable, please refer to Figure 1 and Figure 2, a threaded sleeve 412 is fixed on the weight member 405, and an external thread is provided at the bottom of the multi-section telescopic rod 401. The multi-section telescopic rod 401 is threadedly connected to the threaded sleeve 412 through the external thread.

[0051] In one embodiment, for the convenience of overhauling the components in the cavity 11, please refer to Figure 1 and Figure 2 , a cover plate 12 for sealing and covering the cavity 11 is provided at the upper end of the floating body 1. The cover plate 12 is detachably connected to the floating body 1 through bolts. By opening the cover plate 12, the components in the cavity 11 can be directly observed, which is convenient for overhaul.

[0052] In one embodiment, for the convenience of hingedly installing the multi-section telescopic rod 401 at the bottom of the floating body 1, please refer to Figure 1 and Figure 2 , an ear plate 413 is fixed at the bottom of the floating body 1. A circular hole for the pin shaft 414 to pass through is radially provided at the top of the multi-section telescopic rod 401. The multi-section telescopic rod 401 is hinged to the ear plate 413 through the pin shaft 414 passing through the circular hole. The pull rope 406 in the multi-section telescopic rod 401 bypasses the pin shaft 414 and then enters the cavity 11.

[0053] In one embodiment, for the convenience of hingedly installing the two underwater electric push rods 402 at the bottom of the floating body 1, please refer to Figure 1 , a vertical plate 415 is fixed at the bottom of the floating body 1. The underwater electric push rods 402 are located on both sides of the vertical plate 415. The installation ends of the underwater electric push rods 402 are hingedly installed on the vertical plate 415 through hinge seats.

[0054] The technical features of the above embodiments can be combined arbitrarily. For the sake of concise description, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, it should be considered as the scope recorded in this specification.

[0055] The above embodiments only represent several implementation manners of the present invention. The description is relatively specific and detailed, but it cannot be understood as a limitation to the scope of the utility model patent. It should be noted that for those of ordinary skill in the art, without departing from the concept of the present invention, several deformations and improvements can still be made, and these all belong to the protection scope of the present invention. Therefore, the protection scope of the utility model patent should be subject to the appended claims.

[0056] In the description of the present utility model, it should be understood that the orientation or positional relationship indicated by terms such as "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc. is based on the orientation or positional relationship shown in the drawings. It is only for the convenience of describing the present utility model and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation. Therefore, it should not be construed as a limitation to the present utility model.

[0057] In addition, the terms "first" and "second" are only used for descriptive purposes and cannot be understood as indicating or implying relative importance or implicitly specifying the quantity of the indicated technical features. Thus, the features defined with "first" and "second" may explicitly or implicitly include at least one of such features. In the description of the present utility model, the meaning of "a plurality of" is at least two, such as two, three, etc., unless otherwise clearly and specifically defined. In the present utility model, unless otherwise clearly specified and defined, terms such as "mounted", "connected", "connected to", "fixed" and the like should be understood in a broad sense. For example, it may be a fixed connection, a detachable connection, or integrated; it may be a mechanical connection or an electrical connection; it may be directly connected or indirectly connected through an intermediate medium, and it may be the internal communication of two elements or the interaction relationship between two elements, unless otherwise clearly defined. For those of ordinary skill in the art, the specific meanings of the above terms in the present utility model can be understood according to specific circumstances.

Claims

1. A portable field surface river flow measurement device, including a floating body (1) capable of floating on water, and a cavity (11) is arranged inside the floating body (1). It is characterized in that, It further includes: A detection device (2), installed at the bottom of the floating body (1) and used for scanning the river channel contour; A liquid level detection device (3), installed on the floating body (1) and used for detecting the river liquid level; A stability maintaining mechanism (4), used for maintaining the stability of the floating body (1) when drifting in water, including a hollow multi-section telescopic rod (401), an underwater electric push rod (402), a driving motor (403), a winding wheel (404), and a weight member (405). Two multi-section telescopic rods (401) and two underwater electric push rods (402) are hinged to the bottom of the floating body (1). The lower end of the multi-section telescopic rod (401) is installed with a weight member (405). The multi-section telescopic rods (401) and the underwater electric push rods (402) are in one-to-one correspondence. The output end of the underwater electric push rod (402) is hinged to the corresponding multi-section telescopic rod (401). The driving motor (403) is fixedly installed in the cavity (11). The winding wheel (404) is rotatably installed in the cavity (11). Two winding wheels (404) are provided and are in one-to-one correspondence with the multi-section telescopic rods (401). A pulling rope (406) is wound and installed on the winding wheel (404). An opening communicating with the cavity (11) is provided at the bottom of the floating body (1). The free end of the pulling rope (406) passes through the opening and the inner cavity of the multi-section telescopic rod (401) and then is connected to the bottom end of the multi-section telescopic rod (401). The driving motor (403) drives the two winding wheels (404) to rotate, and the rotation directions of the two winding wheels (404) are set to be opposite; the vertical average flow velocity can be approximately measured A speed measuring device (5), used for detecting the floating speed of the floating body (1) on the water; A wireless transmission device (6), installed in the cavity (11); A ground base station (7), communicatively connected to the detection device (2), the liquid level detection device (3), and the speed measuring device (5).

2. The portable field surface river flow measurement device according to claim 1, wherein, The stability maintaining mechanism (4) further includes a winding shaft (407), a guiding shaft (408), a guiding wheel (409), and a winding gear (410). Two winding shafts (407) and two guiding shafts (408) are provided. The winding shafts (407) and the guiding shafts (408) are both rotatably installed in the cavity (11). The winding shafts (407) are in one-to-one correspondence with the winding wheels (404). The winding wheels (404) are fixed on the corresponding winding shafts (407). Winding gears (410) are installed on the winding shafts (407). The two winding gears (410) are meshed and connected. The driving motor (403) is connected to one of the winding shafts (407) through a coupling. Guiding wheels (409) are installed on the guiding shafts (408). The guiding wheels (409) are in one-to-one correspondence with the winding wheels (404). The pulling rope (406) on the winding wheel (404) bypasses the guiding wheel (409) and then passes through the opening.

3. The portable field surface river flow measurement device according to claim 1, wherein, A sealing ring (411) is installed at the opening, and the pulling rope (406) is sealingly connected to the sealing ring (411).

4. The portable field surface river flow measurement device according to claim 1, characterized in that, An underwater 360° camera (8) is installed at the bottom of the floating body (1). The underwater 360° camera (8) is communicatively connected to the ground base station (7) through the wireless transmission device (6).

5. The portable field surface river flow measurement device according to claim 4, wherein A storage battery (9) is installed in the cavity (11), and the storage battery (9) is electrically connected to the detection device (2), the liquid level detection device (3), the drive motor (403), the underwater electric push rod (402), and the wireless transmission device (6).

6. The portable field surface river flow measurement device according to claim 1, characterized in that, A threaded sleeve (412) is fixed on the weight member (405), the bottom of the multi-section telescopic rod (401) is provided with an external thread, and the multi-section telescopic rod (401) is threadedly connected to the threaded sleeve (412) through the external thread.

7. The portable field surface river flow measurement device according to claim 1, wherein, A cover plate (12) for sealing and covering the cavity (11) is provided at the upper end of the floating body (1), and the cover plate (12) is detachably connected to the floating body (1) by bolts.

8. The portable field surface river flow measurement device according to claim 1, characterized in that, An ear plate (413) is fixed to the bottom of the floating body (1), a circular hole for a pin shaft (414) to pass through is radially formed at the top of the multi-section telescopic rod (401), and the multi-section telescopic rod (401) is hinged to the ear plate (413) through the pin shaft (414) passing through the circular hole.

9. The portable field surface river flow measurement device according to claim 1, characterized in that A vertical plate (415) is fixed to the bottom of the floating body (1), and the installation end of the underwater electric push rod (402) is hingedly installed on the vertical plate (415).

10. The portable field surface river flow measurement device according to claim 1, characterized in that, The speed measuring device (5) is a radar speedometer.

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