Test method of automobile roll-on-roll-off ship stern ramp load monitoring system

Abstract

The invention provides a test method of an automobile roll-on-roll-off ship stern ramp load monitoring system, and the method comprises the steps: opening a stern ramp of an automobile roll-on-roll-off ship through the traction of a steel wire rope, so as to enable the stern ramp to be in contact with a wharf; starting a load monitoring system, and carrying out at least one of the following tests based on the mode that the module vehicle bears the weight: detecting whether the load monitoring system is activated or not under the condition that the total weight of the module vehicle bearing the weight reaches a first preset threshold value; detecting the accuracy of monitoring the tension of the steel wire rope by the load monitoring system; detecting whether the upper limit of the bearing weight of the stern ramp reaches a second preset threshold value or not based on the load monitoring system; namely, crane resources are saved through the mode that the module vehicle bears the weight, the testing efficiency is improved, the influence on the wharf production cycle is reduced, and meanwhile the problem that load adjustment operation is inconvenient is solved.

Description

Technical Field

[0001] The invention belongs to the technical field of ships, and in particular relates to a testing method for a stern ramp load monitoring system of a roll-on / roll-off ship for automobiles. Background Art

[0002] A Pure Car and Truck Carrier (PCTC) is a vessel designed specifically for transporting vehicles such as cars and trucks. A PCTC has a stern ramp at the stern. During vehicle loading and unloading operations, the driver drives the vehicle along the ramp to complete the vehicle embarkation or disembarkation process.

[0003] To ensure the stern ramp can safely and stably carry vehicles, the load monitoring system (LMS) plays a key role. It can monitor the load on the stern ramp in real time. Therefore, testing the load monitoring system is crucial.

[0004] Conventional technology typically uses a crane to install weights piece by piece and arrange them on the stern ramp surface to complete the LMS test. However, this method has many problems: First, the entire testing process is slow, and the crane is occupied for a long time, which greatly reduces testing efficiency and affects the normal production cycle of the terminal. Second, if the load needs to be adjusted during the test, the operation is extremely inconvenient and the weights must be re-installed piece by piece by the crane, which consumes a lot of manpower, material resources, and time. Summary of the Invention

[0005] In a first aspect, an embodiment of the present invention provides a method for testing a load monitoring system for a stern ramp of a car roll-on / roll-off ship, comprising: opening the stern ramp of the car roll-on / roll-off ship by pulling with a steel wire rope so that the stern ramp is in contact with the dock; turning on the load monitoring system, and performing at least one of the following tests based on the manner in which the modular car carries the weights: detecting whether the load monitoring system is activated when the total weight of the modular car carrying the weights reaches a first preset threshold; detecting the accuracy of the load monitoring system in monitoring the tension of the steel wire rope; and detecting whether the upper limit of the load weight of the stern ramp reaches a second preset threshold based on the load monitoring system.

[0006] In some embodiments, when the total weight of the modular car carrying the weights reaches a first preset threshold, detecting whether the load monitoring system is activated includes: adding a preset weight of weights to the modular car to determine the current total weight of the modular car carrying the weights; driving the modular car carrying the weights back and forth between the dock and the cabin via the stern ramp to detect whether the load monitoring system is activated; repeating the step of adding a preset weight of weights to the modular car until the load monitoring system is activated to determine whether the current total weight of the modular car carrying the weights reaches the first preset threshold.

[0007] In some embodiments, the detection of the accuracy of the load monitoring system in monitoring the tension of the wire rope includes: adding a weight of a preset weight to the modular vehicle to determine the current total weight of the modular vehicle carrying the weight; driving the modular vehicle carrying the weight back and forth between the dock and the cabin via the stern ramp, and obtaining the current tension value of the wire rope based on the load monitoring system; when the current tension value is consistent with the theoretical tension value, repeating the step of adding a weight of a preset weight to the modular vehicle until the number of repetitions reaches a preset number, and determining that the accuracy of the load monitoring system meets the preset requirements.

[0008] In some embodiments, the load monitoring system is used to detect whether the upper limit of the load-bearing weight of the stern springboard has reached a second preset threshold, including: adding a weight of a preset weight to the module car to determine the current total weight of the module car carrying the weight; driving the module car carrying the weight back and forth between the dock and the cabin via the stern springboard, and obtaining the current tension value of the wire rope based on the load monitoring system; repeating the step of adding a weight of a preset weight to the module car until the current tension value matches the theoretical tension value corresponding to the second preset threshold, and determining that the upper limit of the load-bearing weight of the stern springboard has reached the second preset threshold.

[0009] In some embodiments, adding weights of a preset weight to the modular vehicle includes: evenly placing weights of a preset weight on the modular vehicle using a forklift; driving the modular vehicle carrying the weights back and forth between the dock and the cabin via the stern ramp includes: driving the modular vehicle carrying the weights back and forth between the dock and the cabin via the stern ramp at a speed lower than a preset speed.

[0010] In some embodiments, before performing at least one of the following tests based on the modular vehicle carrying weights, the method further includes: driving an empty modular vehicle back and forth between the dock and the cabin via the stern ramp to ensure that the modular vehicle can pass the stern ramp smoothly.

[0011] In some embodiments, the stern ramp is composed of a first section ramp, a second section ramp and a third section ramp, and the stern ramp contacts the dock, including: arranging the first section ramp and the second section ramp in a straight line, and the third section ramp is in full contact with the dock.

[0012] In some embodiments, the third section of the gangway is in full contact with the pier, comprising: placing a steel plate of a preset thickness on the pier, wherein the steel plate is in contact with the third section of the gangway.

[0013] In some embodiments, the method further comprises: placing a hemp rope on the steel plate, wherein the hemp rope is in contact with the third springboard.

[0014] In some embodiments, the step of opening the stern ramp of the car roll-on / roll-off ship by pulling with a steel wire rope so that the stern ramp contacts the dock includes: opening the stern ramp of the car roll-on / roll-off ship by pulling with a steel wire rope within a preset time period so that the angle between the stern ramp and the ground is lower than a preset angle, and the preset time period includes at least one of the following: low tide.

[0015] The beneficial effects brought about by the present invention are as follows:

[0016] It can be seen from the above scheme that an embodiment of the present invention provides a testing method for the load monitoring system of the stern ramp of a car roll-on / roll-off ship. By using a modular car to carry the weight, it saves crane resources, improves testing efficiency, reduces the impact on the terminal production cycle, and solves the problem of inconvenience in load adjustment operation. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 A schematic flow chart of a test method for a stern ramp load monitoring system for a car roll-on / roll-off ship provided by an embodiment of the present invention;

[0018] Figure 2a A top view of a PCTC provided in an embodiment of the present invention;

[0019] Figure 2b A side view of a PCTC provided in an embodiment of the present invention;

[0020] Figure 2c A side view of a stern ramp provided by an embodiment of the present invention;

[0021] Figure 3 for Figure 1 A detailed flow chart of step S103 in the illustrated embodiment;

[0022] Figure 4 for Figure 1 A detailed flow chart of step S104 in the illustrated embodiment;

[0023] Figure 5 for Figure 1A detailed flow chart of step S105 in the illustrated embodiment;

[0024] Figure 6a A schematic diagram of an empty modular vehicle entering a vehicle cabin provided by an embodiment of the present invention;

[0025] Figure 6b A schematic diagram of an empty module vehicle returning to a dock provided by an embodiment of the present invention;

[0026] Figure 7a A schematic diagram of a modular vehicle carrying weights entering a vehicle cabin provided by an embodiment of the present invention;

[0027] Figure 7b A schematic diagram of a modular vehicle carrying weights returning to a dock provided by an embodiment of the present invention;

[0028] Stern ramp - 10; steel wire rope - 20; steel plate - 30; hemp rope - 40; modular car - 50; weight - 60. DETAILED DESCRIPTION

[0029] To make the objectives, technical solutions, and advantages of the present invention more clear, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the accompanying drawings of the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making any creative efforts shall fall within the scope of protection of the present invention.

[0030] Figure 1 The present invention provides a flow chart of a method for testing a stern ramp load monitoring system for a car ro-ro ship. Figure 1 As shown, the test method includes the following steps:

[0031] Step S101: Open the stern ramp of the car roll-on / roll-off ship by pulling with a steel wire rope so that the stern ramp contacts the dock.

[0032] Figure 2a A top view of a PCTC provided in an embodiment of the present invention. Figure 2b A side view of a PCTC provided in an embodiment of the present invention. Figure 2a 、 2b As shown, a stern ramp 10 is provided at the stern of the PCTC. The stern ramp 10 is opened under the traction of a steel wire rope 20 and contacts the dock.

[0033] In some embodiments, the stern ramp is composed of a first section ramp, a second section ramp and a third section ramp, and the stern ramp contacts the dock, including: arranging the first section ramp and the second section ramp in a straight line, and the third section ramp is in full contact with the dock.

[0034] Figure 2c A side view of a stern ramp provided by an embodiment of the present invention, such as Figure 2c As shown, the stern gangway 10 is composed of a first gangway, a second gangway and a third gangway. Under the movement of the wire rope 20, the first gangway and the second gangway are adjusted to be in a straight line, and the third gangway is in full contact with the dock so that it is evenly stressed.

[0035] In some embodiments, the third section of the gangway is in full contact with the dock, comprising: placing a steel plate of a preset thickness on the dock, wherein the steel plate is in contact with the third section of the gangway. Specifically, the preset thickness can be 30 mm; Figure 2c As shown, a 30 mm thick steel plate 30 is placed on the contact surface between the dock and the stern ramp 10 to improve the bearing capacity of the dock and ensure that the third section of the stern ramp 10 is in full contact with the dock and is evenly stressed.

[0036] In some embodiments, the method further comprises: placing a hemp rope on the steel plate, wherein the hemp rope is in contact with the third springboard. Figure 2c As shown, a number of hemp ropes 40 are laid on the steel plate 30 to reduce the friction between the steel plate 30 and the surface of the stern springboard 10 and avoid damage to the stern springboard 10.

[0037] In some embodiments, step S101 includes: opening the stern ramp of the car roll-on / roll-off ship via a wire rope during a preset time period, such that the angle between the stern ramp and the ground is lower than a preset angle. The preset time period includes at least one of the following: low tide. Specifically, the test is conducted at low tide to avoid the stern ramp being raised at high tide, causing the angle between the stern ramp and the ground to be too large (e.g., an angle of approximately 6° between the stern ramp and the ground), which could cause the weight to slip on the module car and uneven force on both ends of the stern ramp.

[0038] Step S102: Start the load monitoring system and perform at least one of the following tests based on the way the modular vehicle carries the weight.

[0039] Step S103: When the total weight of the module vehicle carrying the weights reaches a first preset threshold, detecting whether the load monitoring system is activated.

[0040] Step S104: detecting the accuracy of the load monitoring system in monitoring the tension of the wire rope.

[0041] Step S105: detecting, based on the load monitoring system, whether the upper limit of the carrying weight of the stern ramp reaches a second preset threshold.

[0042] Specifically, the stern ramp is first opened to make it contact with the dock, and then the LMS is turned on. Then, different types of tests are performed based on the way the modular vehicle carries the weight. For example, the system is detected to see if it is activated when the total weight of the modular vehicle reaches a first preset threshold; the accuracy of the wire rope tension monitoring is tested after the system is activated; and whether the upper limit of the weight carried by the stern ramp has reached a second preset threshold.

[0043] In some embodiments, before step S102, the process further includes: driving an unloaded modular vehicle back and forth between the dock and the ship's cabin via the stern ramp to ensure that the modular vehicle can successfully pass the stern ramp. Specifically, before starting the test, the modular vehicle needs to be driven from the dock to / from the ship's vehicle cabin in an unloaded state to ensure smooth passage.

[0044] The test method for the stern ramp load monitoring system provided in this embodiment utilizes a modular vehicle to carry a weight, effectively resolving the inconvenience of load adjustment in traditional testing. This method also conserves crane resources, significantly improves test efficiency, and significantly minimizes the impact on the terminal's production cycle. Furthermore, this method shortens test time and reduces the impact of water level fluctuations caused by the ebb and flow of the tide on the test. Furthermore, during the test preparation phase, placing a steel plate at the contact surface between the stern ramp and the dock increases the dock's load-bearing capacity, ensuring full contact and even load distribution. Furthermore, laying several hemp rope segments on the steel plate reduces friction between the steel plate and the stern ramp surface, preventing damage to the stern ramp. Furthermore, conducting the test at low tide ensures that the angle between the stern ramp and the ground is less than or equal to 6°, preventing problems such as the weight sliding on the modular vehicle due to excessive angles and uneven load distribution at both ends of the stern ramp.

[0045] Based on the above embodiments, Figure 3 for Figure 1 A detailed flow chart of step S103 in the embodiment shown is as follows: Figure 3 As shown, the method includes:

[0046] Step S1031: Add a weight of preset weight to the module vehicle, and determine the current total weight of the module vehicle carrying the weight.

[0047] Step S1032: driving the modular vehicle carrying the weights back and forth between the dock and the cabin via the stern ramp, and detecting whether the load monitoring system is activated.

[0048] If not, return to step S1031; if so, execute step S1033.

[0049] Step S1033: Determine whether the current total weight of the modular vehicle carrying the weights reaches a first preset threshold.

[0050] Specifically, assuming that the first preset threshold for LMS system activation is set to 200t, it is necessary to detect whether LMS is activated when the load on the stern ramp reaches 200t. The test process is as follows: the weight of the empty modular car is 80t. Every time a preset weight (such as 20t) is added to the modular car, the current total weight of the modular car carrying the weight (that is, the sum of the weight of the modular car and the weight carried on the modular car) is accurately determined. The modular car carrying the weight is driven back and forth on the stern ramp to detect whether the LMS system is activated. If not, continue to add 20t of weight and repeat the back and forth operation on the stern ramp until the LMS is activated. At this time, it can be determined whether the current total weight of the modular car carrying the weight has reached 200t when the LMS is activated.

[0051] To expedite the testing process, a 100-ton weight can be placed directly on the modular vehicle for the first time. At this point, the total weight of the modular vehicle carrying the weight is 180 tons (less than 200 tons). The modular vehicle is then driven back and forth on the stern ramp to test whether the LMS is activated. If not, a 20-ton weight is added until the LMS is detected. If the LMS is activated, the activation threshold for the system is 200 tons, and the wire rope is tightened.

[0052] Based on the above embodiment, the starting threshold of the load monitoring system is detected by gradually adding weights on the module vehicle, which saves crane resources, improves testing efficiency, reduces the impact on the terminal production cycle, and ensures that the testing work is carried out efficiently and smoothly.

[0053] Based on the above embodiments, Figure 4 for Figure 1 A detailed flow chart of step S104 in the embodiment shown is as follows: Figure 4 As shown, step S104 includes:

[0054] Step S1041: Add a weight of a preset weight to the module vehicle to determine the current total weight of the module vehicle carrying the weight.

[0055] Step S1042: driving the modular vehicle carrying the weights back and forth between the dock and the cabin via the stern ramp, and obtaining the current tension value of the wire rope based on the load monitoring system.

[0056] Step S1043: Determine whether the current tension value is consistent with the theoretical tension value.

[0057] If yes, execute step S1044; if no, end this embodiment.

[0058] Step S1044: Determine whether the number of repeated executions reaches a preset number.

[0059] If not, return to step S1041; if so, execute step S1045.

[0060] Step S1045: Determine whether the accuracy of the load monitoring system meets preset requirements.

[0061] Specifically, a tension sensor can be installed on the wire rope to collect the tension on the wire rope in real time and transmit it to the LMS. After completing the LMS system activation test, the modular vehicle can continue to add 20 tons of weights at a time. The modular vehicle can then be driven back and forth between the dock and the cabin via the stern ramp. During this process, the wire rope tension data collected by the LMS system is judged to be consistent with the theoretical tension value. The theoretical tension value here is calculated based on factors such as the total weight of the modular vehicle carrying the weights and the wire rope structure. If the collected tension data is consistent with the theoretical value after multiple rounds of testing, it indicates that the LMS system has a high degree of accuracy.

[0062] Based on the above embodiment, the accuracy of the load monitoring system is tested by gradually adding weights to the module vehicle, which saves crane resources, improves testing efficiency, reduces the impact on the terminal production cycle, and provides a basis for subsequent applications of LMS.

[0063] Based on the above embodiments, Figure 5 for Figure 1 A detailed flow chart of step S105 in the embodiment shown is as follows: Figure 5 As shown, step S105 includes:

[0064] Step S1051: Add a weight of preset weight to the module vehicle to determine the current total weight of the module vehicle carrying the weight.

[0065] Step S1052: driving the modular vehicle carrying the weights back and forth between the dock and the cabin via the stern ramp, and obtaining the current tension value of the wire rope based on the load monitoring system.

[0066] Step S1053: Determine whether the current tension value is consistent with the theoretical tension value corresponding to the second preset threshold.

[0067] If not, continue to return to step S1051; if so, execute step S1054.

[0068] Step S1054: Determine whether the upper limit of the load-bearing weight of the stern ramp reaches a second preset threshold.

[0069] Specifically, after completing the LMS activation and accuracy test, the module vehicle can continue to add 20-ton weights at a time. The module vehicle can then be driven back and forth between the dock and the ship's cabin via the stern ramp. During this process, the wire rope tension data collected by the LMS system is determined to be consistent with the theoretical tension value of a second preset threshold. The second preset threshold can be understood as the upper limit of the stern ramp's load capacity, for example, set at 300 tons. Based on this upper limit and relevant factors such as the wire rope structure, the corresponding theoretical tension value can be calculated. If the wire rope tension data matches the theoretical tension value corresponding to a load capacity of 300 tons, it can be concluded that the stern ramp is capable of carrying a load of 300 tons.

[0070] Based on the above embodiment, the upper limit of the load-bearing weight of the stern ramp is tested by gradually adding weights on the module vehicle, which saves crane resources, improves testing efficiency, and reduces the impact on the terminal production cycle.

[0071] Figure 6a This is a schematic diagram of an empty modular vehicle entering a vehicle cabin provided by an embodiment of the present invention. Figure 6b This is a schematic diagram of an empty module vehicle returning to a dock provided by an embodiment of the present invention. Figure 7a A schematic diagram of a modular vehicle carrying a weight entering a vehicle compartment provided by an embodiment of the present invention. Figure 7b A schematic diagram of a modular vehicle carrying weighted iron returning to the dock provided in an embodiment of the present invention. Figure 6a-Figure 7b The embodiment of the present invention is described in detail. This embodiment is mainly divided into two stages: a pre-test preparation stage and a test stage.

[0072] Preparation stage: Place a 30mm thick steel plate 30 at the contact surface between the stern ramp 10 and the dock, and lay several hemp ropes 40 on the steel plate 30; firmly moor the PCTC vessel to the dock, and open the stern ramp 10 at low tide under the traction of the steel wire rope 20, ensuring that the first and second sections form a straight line, the third section is in full contact with the dock and evenly stressed, the angle between the stern ramp 10 and the ground is about 6°, and the LMS button remains on.

[0073] Test phase: driving the empty module vehicle 50 from the dock into the vehicle cabin via the stern ramp 10 (e.g. Figure 6a ), and then drive the empty module 50 vehicle back to the dock (such as Figure 6b ) to confirm that the module car 50 can pass smoothly; use a forklift to evenly place the 100t weight 60 on the module car 50. At this time, the total weight of the module car 50 and the weight 60 is about 180t. Drive the module car 50 slowly from the dock into the vehicle cabin at a speed of less than 1km / h (such as Figure 7a ) and then sail back to the pier (such as Figure 7b), observing that the LMS system did not activate during this process. Subsequently, the load was increased by 20 tons, bringing the total weight to approximately 200 tons. The aforementioned entry and exit procedures were repeated, at which point the LMS system activated and the wire rope was tightened. After the LMS was activated, the load was increased by 20 tons each time, repeating the entry and exit procedures. The tension data from each test was consistent with the theoretical data until the total weight of the modular vehicle 50 and the weights it carried reached 300 tons, thus determining the upper limit of the stern ramp 10's load capacity. After the test was completed, the modular vehicle 50 was returned to the dock and the weights 60 were removed (concluding the actual operational portion of the test). Finally, the LMS button was turned off and the test site was cleaned up.

[0074] The entire test process and the monitoring and analysis of various data proved that the LMS system will be activated when the stern ramp load reaches 200t, and that the stern ramp has the ability to carry a load of 300t, providing an effective basis for the performance evaluation of the PCTC ship's stern ramp load monitoring system.

[0075] It should be noted that, in this document, relational terms such as "first" and "second" are used only to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any actual relationship or order between these entities or operations. Moreover, the terms "comprises," "comprising," or any other variations thereof are intended to cover non-exclusive inclusion, so that a process, method, article, or device comprising a series of elements includes not only those elements, but also other elements not explicitly listed, or elements inherent to such process, method, article, or device. In the absence of further limitations, an element defined by the phrase "comprising a ..." does not exclude the presence of other identical elements in the process, method, article, or device comprising the element.

[0076] The above is a preferred embodiment of the present invention. It should be pointed out that for ordinary technicians in this technical field, several improvements and modifications can be made without departing from the principles of the present invention. These improvements and modifications should also be regarded as the scope of protection of the present invention.

Claims

1. A test method for a stern ramp load monitoring system for a car roll-on / roll-off ship, characterized in that: include: Opening the stern ramp of the car roll-on / roll-off ship by pulling with a steel wire rope so that the stern ramp contacts the dock; Turn on the load monitoring system and perform at least one of the following tests based on the modular vehicle carrying the weight: detecting whether the load monitoring system is activated when the total weight of the module vehicle carrying the weights reaches a first preset threshold; Testing the accuracy of the load monitoring system in monitoring the tension of the wire rope; The load monitoring system detects whether the upper limit of the carrying weight of the stern ramp reaches a second preset threshold.

2. The method according to claim 1, characterized in that When the total weight of the modular vehicle carrying the weights reaches a first preset threshold, detecting whether the load monitoring system is activated includes: Add a weight of a preset weight to the module car and determine the current total weight of the module car carrying the weight; Driving the modular vehicle carrying the weights back and forth between the dock and the cabin via the stern ramp to detect whether the load monitoring system is activated; The step of adding a weight of a preset weight to the module car is repeated until the load monitoring system is activated to determine whether the current total weight of the module car carrying the weight reaches a first preset threshold.

3. The method according to claim 2, characterized in that The detecting the accuracy of the load monitoring system in monitoring the wire rope tension includes: Add a weight of a preset weight to the module car and determine the current total weight of the module car carrying the weight; Driving the modular vehicle carrying the weights back and forth between the dock and the cabin via the stern ramp, and obtaining a current tension value of the wire rope based on the load monitoring system; When the current pulling force value is consistent with the theoretical pulling force value, the step of adding a weight of a preset weight to the module vehicle is repeated until the number of repetitions reaches a preset number, and it is determined that the accuracy of the load monitoring system meets the preset requirements.

4. The method according to claim 3, characterized in that The detecting, based on the load monitoring system, whether the upper limit of the carrying weight of the stern ramp reaches a second preset threshold value includes: Add a weight of a preset weight to the module car and determine the current total weight of the module car carrying the weight; Driving the modular vehicle carrying the weights back and forth between the dock and the cabin via the stern ramp, and obtaining a current tension value of the wire rope based on the load monitoring system; Repeat the step of adding a weight of a preset weight to the module vehicle until the current tension value matches the theoretical tension value corresponding to the second preset threshold value, and determine that the upper limit of the load-bearing weight of the stern ramp reaches the second preset threshold value.

5. The method according to any one of claims 2 to 4, characterized in that: The step of adding a weight of a preset weight to the module vehicle comprises: Using a forklift, weights of a preset weight are evenly placed on the module vehicle; The method of driving the modular vehicle carrying the weights back and forth between the dock and the cabin via the stern ramp comprises: The module vehicle carrying the weights is driven to and fro between the dock and the cabin via the stern ramp at a speed lower than a preset speed.

6. The method according to any one of claims 2 to 4, characterized in that: Before performing at least one of the following tests based on the modular vehicle-loaded weight method, the method further includes: The unloaded module vehicle is driven back and forth between the dock and the cabin via the stern ramp to ensure that the module vehicle passes the stern ramp smoothly.

7. The method according to any one of claims 1 to 4, characterized in that The stern ramp is composed of a first section ramp, a second section ramp and a third section ramp, and the stern ramp is in contact with the dock, including: The first and second gangway sections are aligned in a straight line, and the third gangway section is in full contact with the dock.

8. The method according to claim 7, characterized in that The third section of the ramp is in full contact with the dock, including: A steel plate of a preset thickness is placed on the pier, the steel plate being in contact with the third gangway.

9. The method according to claim 8, characterized in that The method further comprises: A hemp rope is placed on the steel plate, and the hemp rope is in contact with the third springboard.

10. The method according to claim 7, characterized in that The method of opening the stern ramp of the car roll-on / roll-off ship by pulling with a steel wire rope so that the stern ramp contacts the dock includes: The stern ramp of the car roll-on / roll-off ship is opened by pulling with a steel wire rope in a preset time period so that the angle between the stern ramp and the ground is lower than a preset angle, and the preset time period includes at least one of the following: low tide.

Images