A device for measuring the tow angle of a dry end of a streamer

Abstract

This invention discloses a measuring device for the drag angle of a towing cable trunk end. The measuring device includes a fixed frame, a rotating frame, a rotating shaft, a measuring frame, a limiting ring, a spring, an inclination sensor, and a wireless communication module. The bottom end of the rotating frame is rotatably connected to the top of the fixed frame, and a rotating shaft II is mounted on the top end. The axis of rotating shaft I extends radially along the guide wheel; the axis of rotating shaft II is parallel to the axis of the guide wheel. One end of each measuring frame is rotatably connected to rotating shaft II, and the other end overlaps the towing cable. The inclination sensor is fixedly mounted on the measuring frame. The limiting ring is mounted on rotating shaft II between the two measuring frames. The spring connects the measuring frame and the rotating frame. The wireless communication module is fixedly mounted on the fixed frame and is signal-connected to both inclination sensor I and inclination sensor II. This measuring device requires no human intervention during the measurement process and can measure the drag angle of the towing system trunk end under stable and unstable towing conditions in real time with high precision, and upload the data.

Description

Technical Field

[0001] This invention relates to the field of underwater towed detection technology, specifically to a device for measuring the tow angle of a towed cable trunk. Background Technology

[0002] As a crucial component of the towing system, the towing cable is responsible for transmitting electricity, signals, and towing force between the towing platform and the underwater towed body. During actual towing, the towing cable forms a towing angle with the horizontal plane under the combined forces of the underwater towed body and its own forces. By measuring the towing angle at the towing platform's trunk end, experimental data can be further refined, providing support for towing performance analysis and design accuracy verification, and effectively guiding the optimized design of the towing system.

[0003] In the current testing process, the dry-end towing angle is measured only after the towing system has stabilized and is placed against the upper edge of the towing cable by a handheld digital level. Due to the influence of vortex-induced vibration of the towing cable and the limitations of the measurement environment and conditions, the above measurement method suffers from problems such as low measurement frequency, poor measurement accuracy, and high safety risks. Furthermore, it cannot effectively monitor the dry-end towing angle under unstable towing conditions such as cable reeling and unloading, acceleration and deceleration, and turning. Summary of the Invention

[0004] In view of this, the present invention provides a measuring device for the drag angle of the towing cable trunk end. This measuring device does not require personnel to participate in the measurement process of the trunk end drag angle, and can measure the trunk end drag angle of the towing system under stable and unstable towing conditions in real time and with high precision, and realize data upload.

[0005] The present invention adopts the following specific technical solution:

[0006] A measuring device for the drag angle of a tow cable trunk, the measuring device comprising:

[0007] The fixing bracket is fixedly installed at both ends of the axle of the cable guide wheel and spans across the upper side of the cable guide wheel;

[0008] The rotating frame has its bottom end rotatably connected to the top of the fixed frame around the rotating shaft I, and its top end is equipped with the rotating shaft II;

[0009] The axis of the rotating shaft I extends radially along the guide wheel, so that the rotating frame can rotate around the rotating shaft I when the tow cable swings significantly laterally.

[0010] The axis of the rotating shaft II is parallel to the axis of the guide wheel;

[0011] One end of both measuring frame I and measuring frame II is rotatably connected to the rotating shaft II, and the other end is attached to the towing cable;

[0012] Inclination sensor I is fixedly installed on the measuring frame I and is used to measure the angle between the measuring frame I and the horizontal plane;

[0013] Inclination sensor II is fixedly installed on the measuring frame II and is used to measure the angle between the measuring frame II and the horizontal plane;

[0014] A limiting ring is installed on the rotating shaft II between the measuring frame I and the measuring frame II;

[0015] Spring I, connected between the measuring frame I and the rotating frame, is used to ensure that the measuring frame I is in close contact with the upper edge of the towing cable;

[0016] Spring II, connected between the measuring frame II and the rotating frame, is used to ensure that the measuring frame II is in close contact with the upper edge of the towing cable;

[0017] The wireless communication module is fixedly installed on the mounting frame and is connected to the tilt sensor I and the tilt sensor II for data acquisition, calculation and uploading of the towing angle of the towing cable trunk.

[0018] Furthermore, the fixing frame consists of fixing clamp I, fixing clamp II, reinforcing ribs, U-shaped plate I, mounting plate I, and handle;

[0019] The fixing clamp I and the fixing clamp II are arranged in pairs and are fixedly connected to both ends of the cable guide wheel by fasteners;

[0020] The reinforcing rib is fixedly connected between the fixing clamp II and the U-shaped plate I to increase the strength of the fixing frame;

[0021] The U-shaped plate I serves as the mounting platform for the fixing clamp II, the reinforcing rib, the mounting plate I, and the handle;

[0022] The mounting plate I is used to fix the wireless communication module in place;

[0023] A handle is fixed to each of the two sides of the U-shaped plate I for transporting the fixing frame;

[0024] The fixing clamp II, the reinforcing rib, the U-shaped plate I, the mounting plate I, and the handle are welded together as a whole.

[0025] Furthermore, the rotating frame consists of a U-shaped plate II that rotates around the rotating shaft I and two hanging ears I that are fixedly installed on the U-shaped plate II;

[0026] One of the hooks I is provided with a hooking interface for hooking the spring I, and the other hook I is provided with a hooking interface for hooking the spring II.

[0027] Furthermore, the measuring frame I consists of a mounting plate II, a slider, a hanging lug II, a guide rod, and a pressure rod;

[0028] One end of the mounting plate II is rotatably mounted on the rotating shaft II, and the other end is fixedly connected to the guide rod;

[0029] The tilt sensor I is fixedly installed on the top of the mounting plate II;

[0030] The other end of the guide rod is fixedly connected to the pressure rod.

[0031] The slider is fixedly installed on the guide rod via the hook II, and is used to adjust the tension of the spring I;

[0032] The hook II is provided with a hook interface for mounting the spring I;

[0033] One end of the spring I is attached to the hook interface of the hook ear I, and the other end is attached to the hook interface of the hook ear II;

[0034] The pressure bar has an inverted U-shaped structure and is tightly attached to the upper edge of the towing cable under the tension of the spring I, for sensing the movement of the towing cable;

[0035] The mounting plate II, the guide rod, and the pressure rod are welded together as a whole.

[0036] The measuring frame II has the same structure as the measuring frame I, but the guide rods of the measuring frame I and the measuring frame II have different lengths.

[0037] Furthermore, the wireless communication module is connected to the mounting bracket via fasteners and is connected to the tilt sensor I and the tilt sensor II via cables;

[0038] The tilt sensor I is connected to the measuring frame I via fasteners;

[0039] The tilt sensor II is connected to the measuring frame II via fasteners.

[0040] Beneficial effects:

[0041] 1. The measuring device of the present invention is used to measure the drag angle of the tow cable trunk end. The measuring device includes a fixed frame, a rotating frame, a rotating shaft I, a measuring frame I, a measuring frame II, a limiting ring, a rotating shaft II, a spring I, a spring II, an inclination sensor I, an inclination sensor II, and a wireless communication module. The fixed frame is fixedly installed at both ends of the axle of the cable guide wheel, providing an installation platform for the rotating frame and the wireless communication module. The rotating frame is used to rotate around the rotating shaft I when the tow cable swings significantly laterally, ensuring the adaptability and safety of the measuring device. The rotating shaft I is used to connect and rotate the rotating frame with the fixed frame. The measuring frame is used to provide an installation platform for the inclination sensor and rotates around the rotating shaft II with the movement of the tow cable. The limiting ring is used to separate the measuring frame I and the measuring frame II axially on the rotating shaft II to prevent interference between them, which would prevent normal rotation. The rotating shaft II enables the measuring frame I and the measuring frame II to be connected to the rotating frame. The device connects and rotates the measuring frame; a spring generates tension between the measuring frame and the rotating frame, ensuring close contact between the measuring frame and the upper edge of the towing cable, preventing collisions and severe separation, and ensuring synchronized movement between the two; two tilt sensors measure the angle between the corresponding measuring frame and the horizontal plane, providing data for calculating the towing cable's dry end drag angle; a wireless communication module acquires the measured angle data through the tilt sensors to calculate and upload the towing cable's dry end drag angle; therefore, the above-mentioned measuring device eliminates the need for personnel to participate in the dry end drag angle measurement process, reducing the influence of towing cable vortex-induced vibration on the measuring device itself, achieving high measurement accuracy, and enabling real-time, high-precision measurement and data upload of the dry end drag angle of the towing system under stable and unstable towing conditions. Furthermore, the above-mentioned measuring device is small in size, lightweight, and easy to install and disassemble.

[0042] 2. In the measuring device of the present invention, the slider of the measuring frame can slide on the guide rod. By sliding the slider, the distance between the slider and the mounting plate can be adjusted, thereby adjusting the length of the spring and the tension of the spring, so that the measuring frame is always in close contact with the towing cable, ensuring that the movement of the towing cable is synchronized during vortex-induced vibration, thereby improving the measurement accuracy of the tilt sensor.

[0043] 3. In the measuring device of the present invention, the pressure rod of the measuring frame is tightly attached to the upper edge of the tow cable under the tension of the spring, and is used to sense the movement of the tow cable. The pressure rod adopts an inverted U-shaped structure to fasten to the upper side of the tow cable. The pressure rod with the inverted U-shaped structure can filter the lateral vibration that causes the tow cable dry end to change the drag angle, and limit the large lateral swing of the tow cable to prevent the tow cable from separating from the pressure rod, ensuring that the pressure rod and the upper edge of the tow cable are always in close contact, thereby improving the measurement accuracy. Attached Figure Description

[0044] Figure 1 This is a schematic diagram of the measuring device of the present invention;

[0045] Figure 2 This is a schematic diagram of the connection structure between the fixed frame and the rotating frame in the measuring device of the present invention;

[0046] Figure 3 This is a schematic diagram of the connection structure between the rotating frame and the measuring frame in the measuring device of the present invention;

[0047] Figure 4 This is a schematic diagram illustrating the calculation principle of the drag angle at the trunk end of the drag cable in this invention. Detailed Implementation

[0048] The present invention will now be described in detail with reference to the accompanying drawings and embodiments.

[0049] This invention provides a device for measuring the drag angle of a tow cable trunk, such as... Figure 1 As shown, the measuring device is used in conjunction with the guide wheel 2 fixed to the tail end of the towed platform and the tow cable 1 entering the water through the guide wheel 2; the measuring device includes a fixed frame 3, a rotating frame 4, a rotating shaft I 5, a measuring frame I 6, a measuring frame II 7, a limiting ring 8, a rotating shaft II 9, a spring I 10, a spring II 11, an inclination sensor I 12, an inclination sensor II 13, and a wireless communication module 14; wherein:

[0050] The fixing frame 3 is fixedly installed at both ends of the axle of the cable guide wheel 2 and spans across the upper side of the cable guide wheel 2; the fixing frame 3 is used to provide an installation platform for the rotating frame 4 and the wireless communication module 14, and to achieve a rigid connection with the cable guide wheel 2;

[0051] The bottom end of the rotating frame 4 is rotatably connected to the top of the fixed frame 3 around the rotating shaft I5, and the top end is equipped with the rotating shaft II9; the axis of the rotating shaft I5 extends radially along the guide wheel 2; the axis of the rotating shaft II9 is ​​parallel to the axis of the guide wheel 2; the rotating frame 4 is used to rotate around the rotating shaft I5 when the tow cable 1 swings laterally, ensuring the adaptability and safety of the device; the rotating shaft I5 is used for the connection and rotation of the rotating frame 4 and the fixed frame 3;

[0052] One end of both measuring frame I6 and measuring frame II7 is rotatably connected to rotating shaft II9, and the other end is attached to tow cable 1; measuring frame I6 is used to provide an installation platform for tilt sensor I12, and measuring frame II7 is used to provide an installation platform for tilt sensor II13. Measuring frame I6 and measuring frame II7 rotate around rotating shaft II9 as tow cable 1 moves; rotating shaft II9 is ​​used for the connection and rotation of measuring frame I6, measuring frame II7 and rotating frame 4;

[0053] The limiting ring 8 is installed on the rotating shaft II9 between measuring frame I6 and measuring frame II7 to separate measuring frame I6 and measuring frame II7 in the axial direction of rotating shaft II9, so as to prevent them from interfering with each other and causing them to be unable to rotate normally;

[0054] Spring I10 is connected between measuring frame I6 and rotating frame 4 to ensure that measuring frame I6 is in close contact with the upper edge of tow cable 1; spring II11 is connected between measuring frame II7 and rotating frame 4 to ensure that measuring frame II7 is in close contact with the upper edge of tow cable 1; spring I10 is used to generate tension between measuring frame I6 and rotating frame 4, and spring II11 is used to generate tension between measuring frame II7 and rotating frame 4, so that measuring frame I6, measuring frame II7 and the upper edge of tow cable 1 are in close contact, preventing collision and serious separation, and ensuring synchronous movement between the two.

[0055] Inclination sensor I12 is fixedly installed on measuring frame I6 and is used to measure the first included angle α between measuring frame I6 and the horizontal plane; Inclination sensor II13 is fixedly installed on measuring frame II7 and is used to measure the second included angle b between measuring frame II7 and the horizontal plane; Inclination sensor I12 and Inclination sensor II13 provide data for calculating the drag angle c of the main end of the tow cable 1.

[0056] The wireless communication module 14 is fixedly installed on the mounting bracket 3 and connected to the tilt sensor I 12 and the tilt sensor II 13 respectively via cables. It is used for power supply and data acquisition of the tilt sensors, calculation and uploading of the drag angle of the tow cable 1 trunk end.

[0057] like Figure 2 As shown, the fixing frame 3 consists of fixing clamp I 15, fixing clamp II 16, reinforcing rib 17, U-shaped plate I 18, mounting plate I 19, and handle 20; wherein:

[0058] Fixed clamps I15 and II16 are set in pairs and fixedly connected to both ends of the cable guide wheel 2 by fasteners, so as to realize the rigid connection between the fixed frame 3 and the rotating shaft of the cable guide wheel 2;

[0059] The reinforcing rib 17 is fixedly connected between the fixing clamp II 16 and the U-shaped plate I 18 to increase the strength of the fixing frame 3;

[0060] U-shaped plate I18 is used to provide an installation platform for fixing clamp II16, reinforcing rib 17, U-shaped plate I18, mounting plate I19, and handle 20;

[0061] Mounting plate I19 provides an installation platform for wireless communication module 14;

[0062] Handle 20 is used for moving the fixed frame 3.

[0063] The two fixing clamps II16, four reinforcing ribs 17, one U-shaped plate I18, two mounting plates I19, and two handles 20 in the fixing frame 3 are welded into a whole.

[0064] like Figure 2As shown, the rotating frame 4 consists of a U-shaped plate II 22 that rotates around a rotating shaft I 5 and two lugs I 21 fixedly installed on the U-shaped plate II 22. One lug I 21 has a mounting interface for a spring I 10, and the other lug I 21 has a mounting interface for a spring II 11. Springs I 10 and II 11 are respectively mounted on the mounting interfaces of the two lugs I 21. The U-shaped plate II 22 is used to rotate around the rotating shaft I 5. The two lugs I 21 can be screwed into both sides of the U-shaped plate II 22 sequentially via threads. After adjusting their orientation, nuts are used to limit the movement of the lugs I 21.

[0065] During installation, after aligning the rotating shaft holes of the fixing bracket 3 and the rotating bracket 4, the rotating shaft I5 is inserted from the side of the rotating bracket 4. Once in place, a nut and a cotter pin are used for positioning and to prevent detachment. The wireless communication module 14 is connected to the mounting plate I19 via fasteners.

[0066] like Figure 3 As shown, measuring frame I6 consists of mounting plate II23, slider 24, lug II25, guide rod 26, and pressure rod 27; measuring frame II7 has the same structure as measuring frame I6, but the guide rod 26 of measuring frame I6 and measuring frame II7 have different lengths; mounting plate II23 provides a mounting platform for tilt sensor I12 and can rotate around rotating shaft II9; one end of mounting plate II23 is rotatably mounted on rotating shaft II9, and the other end is fixedly connected to guide rod 26; slider 24 can slide on guide rod 26 and is used to adjust spring I10. The tension force; the hanging ear II 25 is used to fix the slider 24 on the guide rod 26 and provides a hook interface for the spring I 10; the guide rod 26 provides a motion track for the slider 24 and connects the mounting plate II 23 and the pressure rod 27; the pressure rod 27 is pressed against the upper edge of the tow cable 1 under the action of the tension force of the spring I 10, and is used to sense the movement of the tow cable 1. The lateral vibration that does not cause the tow cable dry end to change the drag angle is filtered by the inverted U-shaped structure of appropriate width, and the large lateral swing of the tow cable 1 is limited to prevent the tow cable 1 from separating from the pressure rod 27. One mounting plate II 23, two guide rods 26 and one pressure rod 27 in the measuring frame I 6 are welded into a whole. The slider 24 consists of two parts: a lower part with a through hole and an upper part with a threaded hole. After determining the position of the slider 24 on the guide rod 26, the hanging ear II 25 is screwed into the nut and the slider 24 from bottom to top and passes through it. After adjusting the orientation, the nut is used to lock it.

[0067] The measuring frame II 7 and the measuring frame I 6 have the same composition and function, but differ in that: the guide rods 26 of the two are of different lengths. By adjusting the length of the guide rods 26, the different spatial positions of the tow cable 1 are measured to calculate the drag angle of the dry end of the tow cable 1; the welding positions between the guide rods 26 and the pressure rods 27 of the two are different. By adjusting the welding positions, the distance between the two ends of the tow cable 1 and the two pressure rods 27 is the same, ensuring that the measuring frame II 7 and the measuring frame I 6 play the same limiting role on the tow cable 1 through the pressure rods 27.

[0068] After aligning the pivot hole of mounting plate II23 on measuring frame I6 and measuring frame II7 with the pivot hole of U-shaped plate II22 on rotating frame 4, insert pivot II9 and insert limiting ring 8 for separation. After positioning, use nuts and cotter pins for limiting and preventing detachment. Springs I10 and II11 are directly hooked onto lug I21 of rotating frame 4 and lug II25 of measuring frame I6 and measuring frame II7, respectively. Inclination sensors I12 and II13 are connected to mounting plate II23 on measuring frame I6 and measuring frame II7 via fasteners.

[0069] The specific working process of the above measuring device is as follows:

[0070] like Figure 1 As shown, before assembling the measuring device with the cable guide wheel 2, remove the fasteners between the fixing clamps I15 and II16 of the fixing frame 3 to separate them; after the tow cable 1 enters the water via the cable guide wheel 2, use the handle 20 to move the measuring device from above the cable guide wheel 2 until the fixing clamps II16 of the fixing frame 3 rest against the axle of the cable guide wheel 2; flip the measuring frame I6 and measuring frame II7 up around the rotating shaft II9, and rotate the rotating frame 4 around the rotating shaft I5 until the measuring frame I6 and measuring frame II7 are above the tow cable 1, and then put them down so that the pressure rods 27 of the measuring frame I6 and measuring frame II7 are attached to the upper edge of the tow cable 1; connect the fixing clamps I15 and II16 from below the cable guide wheel 2 using fasteners; adjust the position of the hanging ear II25 on the guide rod 26 so that the springs I10 and II11 have appropriate tension; connect the cable between the wireless communication module 14 and the tilt sensor I12 and tilt sensor II13.

[0071] During towing, under the action of water flow, the towing cable 1 forms a towing angle 'c' with the horizontal plane. The pressure rod 28 of measuring frame I6, under the preload of spring I10, is pressed tightly against the upper edge of the towing cable 1. Similarly, the pressure rod 28 of measuring frame II7, under the preload of spring II11, is also pressed tightly against the upper edge of the towing cable 1. The towing cable 1 exerts a thrust on the pressure rod 27 in the downstream direction, causing measuring frames I6 and II7 to rotate around the pivot II9. Simultaneously, tilt sensors I12 and II13 measure the angle between measuring frames I6 and II7 and the horizontal plane and transmit this measurement to the wireless communication module 14 for calculating the towing angle of the towing cable 1's dry end.

[0072] like Figure 4 As shown, the distance between the axis O of the rotating shaft II9 and the contact point A between the pressure rod 27 of the measuring frame I6 and the towing cable 1 is L. OA The distance between the axis O of rotating shaft II9 and the contact point B between the pressure rod 27 and the towing cable 1 of measuring frame II7 is L. OB If the first included angle 'a' between the tilt sensor I12 and the measuring frame I6 and the horizontal plane, and the second included angle 'b' between the tilt sensor II13 and the measuring frame II7 and the horizontal plane, then the formula for calculating the drag angle 'c' at the main end of the towing cable 1 is:

[0073] ;

[0074] After the wireless communication module 14 calculates the drag angle c at the trunk end of the tow cable 1, it uploads the data to the host computer via the antenna, thus completing one measurement. As the measuring device continuously samples, calculates, and uploads data, real-time measurement of the drag angle at the trunk end of the tow cable 1 is achieved during the towing process.

[0075] After measurement, disconnect the cable between the wireless communication module 14 and the tilt sensor I12 and tilt sensor II13. Flip the measuring frame I6 and measuring frame II7 up around the rotating shaft II9, and rotate the rotating frame 4 around the rotating shaft I5 until the pressure rod 27 of the measuring frame I6 and measuring frame II7 separates from the tow cable 1, then lower it. Remove the fasteners between the fixing clamps I15 and II16 to separate them from the axle of the guide wheel 2. Use the handle 20 to lift the measuring device from above the guide wheel 2. After connecting the fixing clamps I15 and II16 with fasteners, store the measuring device for the next use.

[0076] In summary, the above are merely preferred embodiments of the present invention and are not intended to limit the scope of protection of the present invention. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the scope of protection of the present invention.

Claims

1. A measuring device for the drag angle of a tow cable trunk, characterized in that, include: The fixing bracket is fixedly installed at both ends of the axle of the cable guide wheel and spans across the upper side of the cable guide wheel; The rotating frame has its bottom end rotatably connected to the top of the fixed frame around the rotating shaft I, and its top end is equipped with the rotating shaft II; The axis of the rotating shaft I extends radially along the guide wheel; The axis of the rotating shaft II is parallel to the axis of the guide wheel; One end of both measuring frame I and measuring frame II is rotatably connected to the rotating shaft II, and the other end is attached to the towing cable; Inclination sensor I is fixedly installed on the measuring frame I and is used to measure the angle between the measuring frame I and the horizontal plane; Inclination sensor II is fixedly installed on the measuring frame II and is used to measure the angle between the measuring frame II and the horizontal plane; A limiting ring is installed on the rotating shaft II between the measuring frame I and the measuring frame II; Spring I, connected between the measuring frame I and the rotating frame, is used to ensure that the measuring frame I is in close contact with the upper edge of the towing cable; Spring II, connected between the measuring frame II and the rotating frame, is used to ensure that the measuring frame II is in close contact with the upper edge of the towing cable; The wireless communication module is fixedly installed on the mounting frame and is connected to the tilt sensor I and the tilt sensor II for data acquisition, calculation and uploading of the towing angle of the towing cable trunk.

2. The measuring device as described in claim 1, characterized in that, The fixing frame consists of fixing clamp I, fixing clamp II, reinforcing rib, U-shaped plate I, mounting plate I, and handle; The fixing clamp I and the fixing clamp II are arranged in pairs and are fixedly connected to both ends of the cable guide wheel by fasteners; The reinforcing rib is fixedly connected between the fixing clamp II and the U-shaped plate I to increase the strength of the fixing frame; The U-shaped plate I serves as the mounting platform for the fixing clamp II, the reinforcing rib, the mounting plate I, and the handle; The mounting plate I is used to fix the wireless communication module in place; A handle is fixed to each of the two sides of the U-shaped plate I for transporting the fixing frame; The fixing clamp II, the reinforcing rib, the U-shaped plate I, the mounting plate I, and the handle are welded together as a whole.

3. The measuring device as described in claim 2, characterized in that, The rotating frame consists of a U-shaped plate II that rotates around the rotating shaft I and two hanging ears I that are fixedly installed on the U-shaped plate II; One of the hooks I is provided with a hooking interface for hooking the spring I, and the other hook I is provided with a hooking interface for hooking the spring II.

4. The measuring device as described in claim 3, characterized in that, The measuring frame I consists of a mounting plate II, a slider, a hanging lug II, a guide rod, and a pressure rod; One end of the mounting plate II is rotatably mounted on the rotating shaft II, and the other end is fixedly connected to the guide rod; The tilt sensor I is fixedly installed on the top of the mounting plate II; The other end of the guide rod is fixedly connected to the pressure rod. The slider is fixedly installed on the guide rod via the hook II, and is used to adjust the tension of the spring I; The hook II is provided with a hook interface for mounting the spring I; One end of the spring I is attached to the hook interface of the hook ear I, and the other end is attached to the hook interface of the hook ear II; The pressure bar has an inverted U-shaped structure and is tightly attached to the upper edge of the towing cable under the tension of the spring I, for sensing the movement of the towing cable; The mounting plate II, the guide rod, and the pressure rod are welded together as a whole; The measuring frame II has the same structure as the measuring frame I, but the guide rods of the measuring frame I and the measuring frame II have different lengths.

5. The measuring device according to any one of claims 1-4, characterized in that, The wireless communication module is connected to the mounting bracket via fasteners and is connected to the tilt sensor I and tilt sensor II via cables. The tilt sensor I is connected to the measuring frame I via fasteners; The tilt sensor II is connected to the measuring frame II via fasteners.

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