Device and method for measuring the distance from a gangway to a pier

Abstract

The present invention relates to the field of ship transportation technology, and specifically discloses a device and method for measuring the distance from a gangway to a dock. The measuring device includes: a measuring winch, a wire mechanism, a rope, a weight, an electric control system and a first sensor. The measuring winch is arranged on the hull; the wire mechanism is arranged at the end of the first section of the gangway; one end of the rope is wound around the measuring winch, and the other end abuts against the wire mechanism and extends out of the wire mechanism; the weight is connected to the other end of the rope and contacts the dock surface; the electric control system is electrically connected to the measuring winch; the first sensor is electrically connected to the electric control system and is used to detect the tension on the rope; the measuring winch controls the retraction and release of the rope and can detect the length of the rope retraction and release, and keeps the rope tension within a preset range. The measuring device and method provided by the present invention can monitor the distance from the gangway to the dock in real time. When the distance from the gangway to the dock is less than the safe distance, the staff is reminded to make adjustments to reduce the strength and pressure of the staff.

Description

Technical Field

[0001] The invention relates to the technical field of ship transportation, and in particular to a device and method for measuring the distance from a gangway to a dock. Background Art

[0002] The ship is provided with a gangplank on both sides, and the gangplank usually includes a first gangplank and a second gangplank. When the ship is sideways to the dock, the first gangplank is suspended above the dock through the stretching device of the hull, the front end of the second gangplank overlaps the end of the first gangplank, and the end of the second gangplank is placed on the dock, thereby forming a passage from the ship to the dock, and personnel and vehicles can enter and exit the ship through the gangplank. The opening angle and position of the first gangplank need to be adjusted with the height of the tide to prevent the gangplank from hitting the dock. In the prior art, sensors such as ultrasonic sensors are used to measure the distance from the gangplank to the dock, but the dock forms are diverse. When some docks are wading, the sensor detects the distance between the gangplank and the water surface, which cannot accurately reflect the distance to the dock. Therefore, when loading and unloading operations are carried out, staff need to monitor the distance from the gangplank to the dock at all times to ensure the smooth progress of the loading and unloading operations. The labor intensity and pressure of the staff are relatively high, and the safety and efficiency of the loading and unloading operations are also relatively low. Summary of the invention

[0003] The object of the present invention is to provide a device and method for measuring the distance from a gangway to a pier, so as to avoid the staff from constantly monitoring the distance from the gangway to the pier, thereby solving the problem of high labor intensity of the staff.

[0004] To achieve this object, the present invention adopts the following technical solutions:

[0005] A device for measuring the distance from a gangway to a pier, comprising:

[0006] Survey winch, set on the hull;

[0007] A wire guide mechanism is arranged at the end of the first springboard;

[0008] A rope, one end of which is wound around the measuring winch, and the other end of which is in contact with the guide wire mechanism and extends out of the guide wire mechanism;

[0009] a weight connected to the other end of the rope and capable of contacting the surface of the dock;

[0010] An electric control system, electrically connected to the measuring winch;

[0011] A first sensor, used to detect the tension on the rope and electrically connected to the electric control system;

[0012] The measuring winch controls the retraction and extension of the rope and keeps the rope tension within a preset range, and the measuring winch can detect the length of the retracted and extended rope.

[0013] Preferably, the preset range of the rope tension means that the rope tension is greater than zero and less than the gravity of the weight.

[0014] Preferably, the wire mechanism includes a moving part and a wire part, the moving part is connected to the wire part, the other end of the rope abuts against the wire part and extends out of the wire part, and the moving part can make the wire part be located in a first position in a working state or a second position in a retracted state.

[0015] Preferably, it further comprises a first pulley mechanism, which is arranged on the hull and located between the measuring winch and the wire mechanism, the rope is wound around the first pulley mechanism, and the first pulley mechanism is provided with the first sensor.

[0016] Preferably, the first pulley mechanism comprises a first pulley and a first pulley fixing member, the first pulley fixing member is fixedly connected to the hull, the first pulley is rotatably connected to the first pulley fixing member, and the rope is wound around the first pulley.

[0017] Preferably, the first sensor is a pin sensor, and the first pulley is rotatably connected to the first pulley fixing member via the pin sensor.

[0018] Preferably, it further comprises a second pulley mechanism arranged on the hull, the second pulley mechanism is arranged adjacent to the first pulley mechanism and is located between the first pulley mechanism and the wire mechanism, and the rope is wound around the second pulley mechanism.

[0019] Preferably, the second pulley mechanism comprises a second pulley and a second pulley fixing member, the second pulley fixing member is fixedly connected to the hull, the second pulley is rotatably connected to the second pulley fixing member, and the rope is wound around the second pulley.

[0020] Preferably, the measuring winch comprises:

[0021] A variable frequency motor, electrically connected to the electric control system;

[0022] A reducer, one end of which is drivingly connected to the variable frequency motor;

[0023] A drum, which is fixedly connected to the output shaft of the reducer, and the rope is wound around the drum;

[0024] The angular displacement measuring component is connected to the output shaft of the reducer and is electrically connected to the electronic control system, and can detect the rotation angle of the output shaft of the reducer.

[0025] A method for measuring the distance from a gangway to a pier, using the device as described above, comprises the following steps:

[0026] Setting a preset range of the rope tension;

[0027] One end of the rope is wound around the measuring winch, and the other end is connected to the weight and then abuts against the guide wire portion and extends out of the guide wire mechanism;

[0028] Select the reference zero point and set the safe distance from the first gangway to the dock;

[0029] placing the weight against the surface of the dock;

[0030] When the tension of the rope exceeds the preset range, the measuring winch controls the retraction and extension of the rope to keep the tension of the rope within the preset range, and detects the retracted length of the rope;

[0031] When the retracted length of the rope is less than the set safety distance, a warning prompt is issued.

[0032] The device and method for measuring the distance from the springboard to the dock provided by the present invention have the following beneficial effects: after the heavy object is connected to the rope, the winch controls the retraction and extension of the rope, the tension on the rope is kept within a preset range, the length of the rope retraction and extension detected by the winch is measured, and when the rope retraction and extension length is less than the preset safety length, that is, the distance from the springboard to the dock is less than the safety distance, the data is transmitted to the electric control system to remind the operator to make adjustments. The device and method for measuring the distance from the springboard to the dock provided by the present invention can be applied to any form of dock, and the distance from the springboard to the dock can be monitored in real time, thereby improving the safety and efficiency during loading and unloading operations and reducing the intensity and pressure of the staff. BRIEF DESCRIPTION OF THE DRAWINGS

[0033] Figure 1 It is a simulation schematic diagram of a device for measuring the distance from a gangway to a dock provided in an embodiment of the present invention;

[0034] Figure 2 Schematic diagram of a device for measuring the distance from a gangway to a dock provided by an embodiment of the present invention;

[0035] Figure 3 yes Figure 2 A partial enlarged view of the middle A;

[0036] Figure 4 is a structural schematic diagram of a wire guide mechanism provided by an embodiment of the present invention;

[0037] Figure 5 is a cross-sectional view of a guide wire mechanism provided by an embodiment of the present invention;

[0038] Figure 6 is a cross-sectional view of a first pulley mechanism provided by an embodiment of the present invention;

[0039] Figure 7 is a cross-sectional view of a second pulley mechanism provided by an embodiment of the present invention;

[0040] Figure 8 is a structural schematic diagram of a second pulley mechanism provided by an embodiment of the present invention;

[0041] Fig. 9 It is a structural diagram of a measuring winch provided in an embodiment of the present invention.

[0042] In the figure:

[0043] 1- measuring winch; 11- cooling fan; 12- frequency conversion motor; 13- speed reducer; 14- reel; 15- encoder;

[0044] 2-first pulley mechanism; 21-first ear plate; 22-first pulley; 23-pin sensor; 24-first support;

[0045] 3-second pulley mechanism; 31-rope blocking mechanism; 32-second pulley; 33-second rotating shaft; 34-second ear plate; 35-second support;

[0046] 4-Rope;

[0047] 5-conducting mechanism; 51-swinging power member; 52-base; 53-pulley swing arm; 54-conducting part;

[0048] 6-Heavy objects;

[0049] 7-Hull;

[0050] 8-First springboard. DETAILED DESCRIPTION

[0051] The technical solution of the present invention is further described below in conjunction with the accompanying drawings and through specific implementation methods. It is understood that the specific embodiments described herein are only used to explain the present invention, rather than to limit the present invention. It is also necessary to explain that, for ease of description, only the parts related to the present invention are shown in the accompanying drawings, rather than all.

[0052] The present invention defines some directional words. Unless otherwise specified, the directional words used, such as "up", "down", "left", and "right", are defined in the present invention under normal use and are consistent with the up, down, left, and right directions shown. "Inside" and "outside" refer to the inside and outside relative to the contour of each part itself. These directional words are used for ease of understanding and do not constitute a limitation on the scope of protection of the present invention.

[0053] In the present invention, unless otherwise clearly specified and limited, a first feature being "above" or "below" a second feature may include that the first and second features are in direct contact, or may include that the first and second features are not in direct contact but are in contact through another feature between them. Moreover, a first feature being "above", "above" and "above" a second feature includes that the first feature is directly above and obliquely above the second feature, or simply indicates that the first feature is higher in level than the second feature. A first feature being "below", "below" and "below" a second feature includes that the first feature is directly below and obliquely below the second feature, or simply indicates that the first feature is lower in level than the second feature.

[0054] In the description of the present invention, unless otherwise clearly specified and limited, the terms "connected", "connected", and "fixed" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0055] This embodiment provides a device and method for measuring the distance from a gangway to a pier, which are used to monitor the distance from the gangway to the pier in real time when a ship docks at a pier to load and unload cargo, so as to reduce the labor intensity of the staff.

[0056] like Figure 1-2 As shown, the measuring device for the distance from the gangway to the dock provided in this embodiment includes a measuring winch 1, a wire mechanism 5, a rope 4, a weight 6, an electric control system and a first sensor. The measuring winch 1 is arranged on the hull 7 and is electrically connected to the electric control system. The wire mechanism 5 is arranged at the end of the first section of the gangway 8, one end of the rope 4 is wound around the measuring winch 1, and the other end is wound around the wire mechanism 5 and extends out of the wire mechanism 5. In this embodiment, the rope 4 is a steel wire rope, which is not limited here. The weight 6 is connected to the other end of the rope 4 and contacts the surface of the dock; the first sensor is used to detect the tension on the rope 4 and is electrically connected to the electric control system.

[0057] The measuring winch 1 controls the retraction and extension of the rope 4 and keeps the tension of the rope 4 within a preset range. The measuring winch 1 can detect the length of the retracted and extended rope 4 and transmit the data to the electronic control system. When the distance from the first section of the gangway 8 to the dock is less than the safe distance, the operator is reminded to make adjustments, thereby improving the safety and efficiency of the loading and unloading operations and reducing the intensity and pressure of the workers.

[0058] Specifically, the device for measuring the distance from the gangway to the dock provided by the present invention, when in use, the staff hangs the weight 6 on the rope 4, and after the rope 4 is abutted against the guide mechanism 5, the rope 4 between the guide mechanism 5 and the weight 6 is in a vertical state, and the reference zero point is set. At this time, the measured distance is displayed as zero, and the safety distance from the first section of the gangway 8 to the dock is set. The measuring winch 1 is controlled to release the rope. After the weight 6 contacts the dock, part of the weight of the weight 6 is supported by the dock, that is, the rope 4 still has a tension applied to the weight 6. The tension of the rope 4 is maintained within a preset range. The safety distance is set based on the reference zero point according to the actual situation of the dock. When the displayed measured distance is less than the safety distance, it is necessary to adjust the opening angle of the first section of the gangway 8, so as to increase the distance between the first section of the gangway 8 and the dock. Of course, the reference zero point can also be other positions, which are not limited here.

[0059] The device for measuring the distance from the gangway to the wharf provided by the present invention can monitor the distance from the gangway to the wharf in real time regardless of the form of the wharf.

[0060] Preferably, the preset range of the tension of the rope 4 means that the tension of the rope 4 is greater than zero and less than the gravity of the weight 6. In this embodiment, the weight 6 is a steel ball, which abuts against the surface of the dock, and the rope tension F is set within a certain interval that is less than the steel ball gravity G and greater than zero. The weight of the weight 6 is a very important factor. If the weight of the weight 6 is too small, the set numerical range will be smaller and easily affected by the water flow. If the weight of the weight 6 is too heavy, it will be inconvenient for the staff to install it. Through experiments, it is better to use a steel ball weighing 16kg. When the rope 4 tension F is greater than the preset range value, the electronic control system controls the measuring winch 1 to release the rope so that the rope 4 tension F reaches the preset range again; when the rope 4 tension F is less than the preset range, the electronic control system controls the measuring winch 1 to retract the rope so that the rope 4 tension F reaches the preset range again.

[0061] In other embodiments, the weight 6 can also be of other shapes or structures, and the preset range of the tension of the rope 4 only needs to be greater than zero and less than the gravity of the weight 6. The specific range can be determined according to the on-site conditions and is not limited here.

[0062] In this embodiment, the wire guide mechanism 5 includes a moving part and a wire guide part (54), the moving part is connected to the wire guide part 54, and can make the wire guide part 54 be located at a first position in a working state and a second position in a retracted state, such as Figure 3-5As shown, in this embodiment, the moving part adopts the form of swinging to realize the switching between the first position and the second position. In other embodiments, other forms of mechanisms such as telescopic and folding can also be adopted, which are not limited here. The wire part 54 uses a pulley. In other embodiments, other structures can also be used, as long as the wire part 54 can support the rope 4, which is not limited here. The use of a pulley can reduce the wear of the rope 4, and it is more convenient to retract and release the rope 4. The moving part includes a base 52, a swinging power member 51 and a pulley swing arm 53. The base 52 is fixedly connected to the springboard. The swinging power member 51 is fixedly connected to the base 52. In this embodiment, the swinging power member 51 is a swinging oil cylinder. In other embodiments, the swinging power member 51 can also be other structures, which are not limited here. One end of the pulley swing arm 53 is connected to the swinging power member 51, and the wire part 54 is rotatably connected to the other end of the pulley swing arm 53, and the swinging power member 51 can drive the pulley swing arm 53 to rotate.

[0063] When the first section gangway 8 is suspended on the dock, the wire mechanism 5 swings to the first position of the working state, that is, the wire portion 54 is in an extended state relative to the first section gangway 8; when the first section gangway 8 is retracted into the hull 7 and the first section gangway 8 is in the process of being retracted or extended, the wire mechanism 5 swings to the second position of the retracted state, that is, the wire portion 54 is retracted into the first section gangway 8, which can prevent the wire portion 54 from interfering with the hull 7 and avoid the wire portion 54 from touching the hull 7 when the first section gangway 8 is closed.

[0064] In this embodiment, the device for measuring the distance from the gangway to the dock provided by the present invention further includes a first pulley mechanism 2, which is arranged on the hull 7 and between the measuring winch 1 and the wire mechanism 5, and the rope 4 is wound around the first pulley mechanism 2, and the first pulley mechanism 2 is provided with a first sensor. The first pulley mechanism 2 can change the extension direction of the rope 4, so that the rope 4 is wound around the first pulley mechanism 2 at a certain angle. When the angle is constant, the calculation can be more accurate when the first sensor detects the tension of the rope 4.

[0065] like Figure 6 As shown, in this embodiment, the first pulley mechanism 2 includes a first pulley 22 and a first pulley fixing member, the first pulley fixing member is fixedly connected to the hull 7, the first pulley 22 is rotatably connected to the first pulley fixing member, and the rope 4 is wound around the first pulley 22. Preferably, the first pulley fixing member is a first ear plate 21 and a first support 24, the first support 24 is fixedly connected to the hull 7, the first ear plate 21 is fixedly connected to the first support 24 and the first ear plate 21 is divided into two left and right parts, which are distributed on both sides of the first pulley 22, and the first rotating shaft passes through the middle of the first pulley 22 and the first ear plate 21, and the first pulley 22 is rotatably connected to the first ear plate 21. In other embodiments, the first pulley fixing member can also be other shapes or structures, which are not limited here.

[0066] In this embodiment, the first sensor is a pin sensor 23, which can detect the tension of the rope 4. The pin sensor 23 can have a built-in amplifier to convert the force strain signal detected by the sensor into a milliampere current signal, so as to achieve long-distance transmission to the electronic control system. The pin sensor 23 can also serve as the rotation axis of the first pulley 22 to fix the first pulley 22 on the first pulley fixing member, without the need to set an additional rotation axis, so that the structure of the first pulley mechanism 2 is simpler. In other embodiments, the first sensor can be a tension sensor, which is set on the rope 4, or other sensor types or set at other positions, which are not limited here.

[0067] In this embodiment, the measuring device for the distance from the gangway to the dock provided by the present invention further includes a second pulley mechanism 3 arranged on the hull 7, the second pulley mechanism 3 is arranged side by side with the first pulley mechanism 2, and is located between the first pulley mechanism 2 and the wire mechanism 5, and the rope 4 is wound around the second pulley mechanism 3. The second pulley mechanism 3 can be arranged to wind the rope 4 around the first pulley mechanism 2 at a fixed angle, and the tension value of the rope 4 at the detection point of the pin sensor 23 is more accurate. By changing the relative position of the first pulley mechanism 2 and the second pulley mechanism 3, the extension direction of the rope 4 can be changed to adapt to various on-site operation conditions.

[0068] like Figure 7-8 As shown, in this embodiment, the second pulley mechanism 3 includes a second pulley 32 and a second pulley fixing member, the second pulley fixing member is fixedly connected to the hull 7, the second pulley 32 is rotatably connected to the second pulley fixing member, and the rope 4 is wound around the second pulley 32.

[0069] The second pulley mechanism 3 also includes a rope blocking mechanism 31, which is fixedly connected to the second pulley fixing member. The rope blocking mechanism 31 is arc-shaped and wrapped around the side of the second pulley 32 away from the first pulley mechanism 2. The rope blocking mechanism 31 can prevent the rope 4 from falling off the second pulley 32.

[0070] Preferably, the second pulley fixing member is a second ear plate 34 and a second support 35. The second support 35 is fixedly connected to the hull 7, the second ear plate 34 is fixedly connected to the second support 35, and the second ear plate 34 is divided into two left and right ones, which are distributed on both sides of the second pulley 32, and the second rotating shaft 33 passes through the middle of the second pulley 32 and the second ear plate 34, so that the second pulley 32 is rotatably connected to the second ear plate 34. In other embodiments, the second pulley fixing member can also be other shapes or structures, which are not limited here.

[0071] like Fig. 9As shown, in this embodiment, the measuring winch 1 includes a variable frequency motor 12, a reducer 13, a drum 14 and an angular displacement measuring device. The variable frequency motor 12 is electrically connected to the electric control system. One end of the reducer 13 is drivingly connected to the variable frequency motor 12. The drum 14 is fixedly connected to the output shaft of the reducer 13, and the rope 4 is wound around the drum 14. The angular displacement measuring device is connected to the output shaft of the reducer 13 and is electrically connected to the electric control system, and can detect the rotation angle of the output shaft of the reducer 13. Preferably, the angular displacement measuring device uses an encoder 15, and the encoder 15 measures the angle through which the measuring winch 1 is rotated, thereby obtaining the retracted and extended length of the rope 4. The variable frequency motor 12 is drivingly connected to a cooling fan 11 on one side away from the reducer 13, and the cooling fan 11 is used to cool the variable frequency motor 12 to avoid the influence on the measurement when the temperature of the variable frequency motor 12 is too high.

[0072] In this embodiment, the steps of the method for measuring the distance from the gangway to the dock provided by the present invention are as follows:

[0073] Step 1: Select the mass of the weight 6 and set the preset range of the tension of the rope 4;

[0074] Step 2: Wind one end of the rope 4 around the measuring winch 1, and connect the other end of the rope 4 to the weight 6 and then abut against the wire portion 54 and extend out of the wire portion 54;

[0075] Step 3: Set the reference zero point and the safe distance from the first section of the ramp 8 to the dock;

[0076] Step 4: Place the weight 6 against the dock surface;

[0077] Step 5: When the tension of the rope 4 exceeds the preset range, the measuring winch 1 controls the retraction and extension of the rope 4 to keep the tension of the rope 4 within the preset range, and detects the retracted and extended length of the rope 4;

[0078] Step 6: When the retracted length of the rope 4 is less than the preset safety distance, a warning prompt is issued, and the opening angle of the first section springboard 8 is adjusted at this time.

[0079] Obviously, the above embodiments of the present invention are merely examples for clearly explaining the present invention, and are not intended to limit the embodiments of the present invention. For those skilled in the art, other different forms of changes or modifications can be made based on the above description, and it is not necessary and impossible to list all the embodiments here. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present invention should be included in the protection scope of the claims of the present invention.

Claims

1. A device for measuring the distance from a gangway to a pier, characterized in that: include: A measuring winch (1) is arranged on the hull (7); A wire guide mechanism (5) is arranged at the end of the first springboard (8); A rope (4), one end of which is wound around the measuring winch (1), and the other end of which is in contact with the guide wire mechanism (5) and extends out of the guide wire mechanism (5); A weight (6) connected to the other end of the rope (4) and capable of contacting the surface of the dock; An electric control system electrically connected to the measuring winch (1); A first sensor, used for detecting the tension on the rope (4), and electrically connected to the electric control system; The measuring winch (1) controls the retraction and extension of the rope (4) and keeps the tension of the rope (4) within a preset range, and the measuring winch (1) is capable of detecting the retracted and extended length of the rope (4); The preset range of the tension of the rope (4) means that the tension of the rope (4) is greater than zero and less than the gravity of the weight (6); The wire guide mechanism (5) comprises a moving part and a wire guide part (54), the moving part is connected to the wire guide part (54), the other end of the rope (4) abuts against the wire guide part (54) and extends out of the wire guide part (54), and the moving part can make the wire guide part (54) be located in a first position in a working state or a second position in a retracted state.

2. The device for measuring the distance from the gangway to the pier as claimed in claim 1, characterized in that: It also comprises a first pulley mechanism (2), the first pulley mechanism (2) being arranged on the hull (7), and the first pulley mechanism (2) being located between the measuring winch (1) and the wire mechanism (5), the rope (4) being wound around the first pulley mechanism (2), and the first pulley mechanism (2) being provided with the first sensor.

3. The device for measuring the distance from the gangway to the pier as claimed in claim 2, characterized in that: The first pulley mechanism (2) comprises a first pulley (22) and a first pulley fixing member, the first pulley fixing member is fixedly connected to the hull (7), the first pulley (22) is rotatably connected to the first pulley fixing member, and the rope (4) is wound around the first pulley (22).

4. The device for measuring the distance from the gangway to the pier as claimed in claim 3, characterized in that: The first sensor is a pin sensor (23), and the first pulley (22) is rotatably connected to the first pulley fixing member via the pin sensor (23).

5. The device for measuring the distance from the gangway to the pier as claimed in claim 2, characterized in that: It also includes a second pulley mechanism (3) arranged on the hull (7), the second pulley mechanism (3) being arranged adjacent to the first pulley mechanism (2) and located between the first pulley mechanism (2) and the wire mechanism (5), and the rope (4) being wound around the second pulley mechanism (3).

6. The device for measuring the distance from the gangway to the dock as claimed in claim 5, characterized in that: The second pulley mechanism (3) comprises a second pulley (32) and a second pulley fixing member, the second pulley fixing member is fixedly connected to the hull (7), the second pulley (32) is rotatably connected to the second pulley fixing member, and the rope (4) is wound around the second pulley (32).

7. The device for measuring the distance from the gangway to the dock as claimed in claim 1, characterized in that: The measuring winch (1) comprises: A variable frequency motor (12), electrically connected to the electric control system; A reducer (13), one end of which is drivingly connected to the variable frequency motor (12); A drum (14) fixedly connected to the output shaft of the reducer (13), and the rope (4) is wound around the drum (14); An angular displacement measuring component is connected to the output shaft of the reducer (13) and is electrically connected to the electric control system, and is capable of detecting the rotation angle of the output shaft of the reducer (13).

8. A method for measuring the distance from a gangway to a pier, characterized in that: Using the device as described in any one of claims 1 to 7, the steps are as follows: Setting the preset range of tension of the rope (4); One end of the rope (4) is wound around the measuring winch (1), and the other end is connected to the weight (6) and then abuts against the guide wire mechanism (5) and extends out of the guide wire mechanism (5); Select a reference zero point and set a safe distance from the first gangway (8) to the pier; placing the weight (6) against the surface of the dock; When the tension of the rope (4) exceeds the preset range, the measuring winch (1) controls the retraction and extension of the rope (4) so ​​that the tension of the rope (4) is kept within the preset range, and detects the retracted and extended length of the rope (4); When the retracted and extended length of the rope (4) is less than the set safety distance, a warning prompt is issued.

Images