Emergency separation verification method

Abstract

An emergency separation verification method comprises the following steps: S1, fixing at least one motion reference unit on a to-be-tested lifting device to collect motion data of the to-be-tested lifting device; a target weight is suspended on a sling of a lifting device to be tested, and at least one separable weight with a separating device is directly or indirectly suspended on the sling; and S2, after the target weight and the separable weight are pulled up by using the to-be-tested lifting device, the separating device is triggered at least once, so that the pulling force borne by the sling is changed. According to the invention, by controlling the disengagement of the disengageable heavy block, different scenes in which the hoisting device is used for salvaging a heavy object on the sea surface are simulated, and the emergency disengagement performance of the hoisting device is verified in a non-marine environment.

Description

Technical Field

[0001] This invention relates to the field of marine engineering crane technology, and specifically to an emergency detachment verification method. Background Technology

[0002] In the field of marine engineering, the salvage and recovery of heavy objects on the seabed, such as shipwrecks, deep-sea equipment, and engineering components, is of paramount importance. On the one hand, sunken heavy objects in key sea areas such as waterways and anchorages can threaten the safety of ship navigation and even cause marine pollution. On the other hand, recovering high-value equipment and usable resources can reduce economic losses and clear obstacles for subsequent marine engineering projects.

[0003] Such operations often require lifting hundreds of tons of heavy objects from the seabed onto transport ships using ship-mounted lifting equipment. However, the actual operation faces significant challenges: for heavy objects that are deeply embedded in silt, the pulling force required for lifting is much greater than their own weight. Excessive pulling force can easily damage the lifting equipment due to the reaction force. At the same time, water flow disturbances cause the heavy objects to be subjected to complex forces, and they may suddenly fall off during the lifting process, which will also have a strong reaction impact on the lifting equipment.

[0004] Therefore, conducting emergency disengagement tests on lifting devices before their actual use to verify their reliability is of great practical significance for ensuring the safety of personnel and ensuring that the lifting device can operate normally under most circumstances. However, conducting on-ship verification directly in the marine environment presents problems such as high operational difficulty, high cost, and poor risk controllability, necessitating the exploration of a scientific and effective alternative verification scheme. Summary of the Invention

[0005] The present invention aims to solve the technical problem of verifying the emergency detachment performance of lifting devices in non-marine environments.

[0006] To solve the above-mentioned technical problems, the present invention provides an emergency detachment verification method, comprising the following steps: Step S1: Fix at least one motion reference unit on the lifting device under test to collect motion data of the lifting device under test; suspend a target weight on the sling of the lifting device under test, and directly or indirectly suspend at least one detachable weight with a detachment device on the sling; Step S2: After using the lifting device under test to pull up the target weight and the detachable weight, trigger the detachment device at least once to change the tension borne by the sling.

[0007] This technical solution, by sequentially executing steps S1 and S2, can simulate the reaction force experienced by the lifting device under test when an emergency detachment event occurs, thus enabling the verification of the emergency detachment performance of the lifting device in a non-marine environment. Furthermore, the motion reference unit is fixed to the slewing platform and / or boom of the lifting device under test. The motion data collected by the motion reference unit includes the attitude angles and translational motion of the lifting device under test. By fixing the motion reference unit, the changes in attitude angles and translational motion of the slewing platform and boom due to the reaction forces can be obtained in a timely manner. By analyzing this data, the personnel can determine the impact experienced by the lifting device under test during emergency detachment.

[0008] Further, the detachable weight includes a first detachable weight and a second detachable weight; step S2 includes the following: Step S2.1: When the pulling force output by the lifting device under test is not greater than the sum of the weights of the first detachable weight, the second detachable weight, and the target weight, the pulling force output by the lifting device under test is continuously increased; Step S2.2: When the pulling force output by the lifting device under test exceeds the sum of the weights of the first detachable weight, the second detachable weight, and the target weight, the detachment device of the second detachable weight is triggered, causing the second detachable weight to detach from the sling. This step simulates the process of pulling the target weight from the seabed in a marine environment, reproducing the situation where the target weight needs to be removed with a greater pulling force due to sinking to the seabed.

[0009] Furthermore, step S2 also includes the following: Step S2.3a: After the second detachable weight is detached from the sling, the pulling force output by the lifting device under test is adjusted to be greater than the weight of the target weight and less than the sum of the weights of the first detachable weight and the target weight. Then, the detachment device of the first detachable weight is triggered, causing the first detachable weight to detach. This step simulates a scenario where, during the process of lifting the target weight, an object attached to it suddenly falls off, or the target weight suddenly changes its posture, causing a sudden change in the pulling force required by the lifting device.

[0010] Furthermore, step S2 also includes the following: Step S2.3b: After the second detachable weight is detached from the sling, the pulling force output by the lifting device under test is adjusted to be greater than the weight of the target weight and less than the sum of the weights of the first detachable weight and the target weight, and then the detachment device of the first detachable weight is triggered; the first detachable weight does not detach from the sling, but the gravity it experiences continuously decreases until it no longer changes. This step simulates the scenario where, during the process of lifting the target weight, the mud and sand loaded inside it continuously dissipate, resulting in a continuous decrease in the pulling force required by the lifting device.

[0011] Furthermore, it also includes step S3: after triggering the detachment device of the first detachable weight, adding a buoyancy compensation weight to the sling. This step simulates a scenario in which, during the process of lifting the target weight, the buoyancy of the target weight disappears after it is pulled out of the water, causing a sudden increase in the pulling force required by the lifting device.

[0012] Furthermore, the release device includes a release hook and a shackle. Workers can use a rope attached to the release hook or shackle and trigger it from a safe location, thus ensuring personal safety during the verification process. Attached Figure Description

[0013] Figure 1 This is a schematic diagram illustrating the principle of an embodiment of the present invention; Figure 2 A schematic diagram illustrating the use of lifting equipment to lift a target weight in a marine environment; Figure 3 This is a schematic diagram illustrating the principle of a second detachable weight according to an embodiment of the present invention.

[0014] The figure shows: 10. Lifting device to be tested; 11. Traction device; 12. Boom; 121. Air pump; 13. Sling; 14. Detachment device; 20. Target weight; 30. Detachable weight; 31. First detachable weight; 32. Second detachable weight; 40. Mother ship; 41. Target ship; 42. Sea surface; 43. Seabed. Detailed Implementation

[0015] The present invention will now be described in further detail with reference to the accompanying drawings and specific embodiments.

[0016] Reference Figures 1 to 3 This invention provides an emergency detachment verification method, comprising the following steps: Step S1: For the lifting device under test whose emergency detachment performance needs to be verified, at least one motion reference unit is fixed on it; then, the operator controls the lifting device under test to use its slings to lift the target weight and the detachable weight with the detachment device.

[0017] Depending on the experimental scenario, the type, mass, and volume of the target weight and detachable weight, as well as their suspension method on the sling, can be adjusted as needed. When the target weight and detachable weight are pulled up, the detachment device is triggered, causing the weight of the detachable weight to gradually decrease or to detach directly from the sling, thus changing the tension on the sling. Depending on the volume of the target weight and detachable weight, the detachable weight can be indirectly suspended from the sling by hanging below the target weight, or it can be directly suspended from the sling.

[0018] Step S2: After using the lifting device under test to lift the target weight and the detachable weight, trigger the detachment device at least once to change the tension on the sling.

[0019] The above simulation illustrates the process of lifting a target weight using a lifting device in a marine environment and gradually pulling it out of the water. The gravity experienced by the detachable weight represents the additional pulling force that the lifting device needs to output during the process of lifting the target weight.

[0020] After the operator triggers the release device, the lifting device will undergo varying degrees of attitude changes due to the reaction force, such as boom swing or lifting device swaying. The operator can verify the reliability of the lifting device under test by collecting motion data of the lifting device under test, such as attitude angle and translational motion, through the motion reference unit, and formulate relevant adjustment plans.

[0021] In some implementations, to more comprehensively verify the reliability of the lifting device under test, a motion reference unit is selected to be set on the slewing platform and / or boom of the lifting device under test to collect motion data including attitude angles and translational motion.

[0022] In some embodiments, the detachable weight includes a first detachable weight and a second detachable weight; step S2 includes the following: Step S2.1: When the tension output by the lifting device under test is not greater than the sum of the first detachable weight, the second detachable weight, the target weight, and the weight it bears, continue to increase the tension output by the lifting device under test.

[0023] In this step, the pulling force output by the lifting device under test continuously increases until it lifts the first detachable weight, the second detachable weight, and the target weight. This simulates the process in actual operation where the lifting device gradually increases its output pulling force to separate the target weight that has sunk to the seabed.

[0024] Step S2.2: After the pulling force output by the lifting device under test is greater than the sum of the gravity of the first detachable weight, the second detachable weight and the target weight, the detachment device of the second detachable weight is triggered, so that the second detachable weight is detached from the sling.

[0025] This process simulates the sudden detachment of a target weight from the seabed after the lifting device outputs a certain pulling force. During this process, because the target weight is embedded in the seabed, the lifting device needs to output a pulling force greater than the sum of the weights of the first detachable weight, the second detachable weight, and the target weight in order to successfully extract the target weight.

[0026] In actual operation, large objects may adhere to the target weight, or the target weight may have structures that significantly increase the resistance to water flow, causing the lifting device to still need to output a pulling force greater than the weight of the target weight itself. Therefore, in some implementations, step S2.3a needs to be performed: after the second detachable weight is detached from the sling, the pulling force output by the lifting device under test is adjusted to be greater than the weight of the target weight but less than the sum of the weights of the first detachable weight and the target weight, and then the detachment device of the first detachable weight is triggered to detach the first detachable weight.

[0027] This step simulates situations where the attachments on the surface of the target weight suddenly separate, or where the posture of the target weight changes, causing a sudden decrease in the resistance it experiences.

[0028] For target weights with large containment spaces, they often become filled with mud, sand, and other debris after sinking to the seabed, increasing their total weight. As the target weight is gradually pulled out of the water, some of the debris escapes, causing its total weight to decrease. Therefore, to simulate this situation, in some embodiments, step S2.3b is performed: after the second detachable weight detaches from the sling, the pulling force output by the lifting device under test is adjusted to be greater than the weight of the target weight but less than the sum of the weights of the first detachable weight and the target weight, and then the detachment device of the first detachable weight is triggered; the first detachable weight does not detach from the sling, but its gravity continuously decreases until it no longer changes.

[0029] In some implementations, the buoyancy of the target weight disappears after it is pulled out of the water. To simulate this situation, step S3 is performed: after triggering the release device of the first detachable weight, a buoyancy compensation weight is added to the sling.

[0030] In some implementations, the disengagement devices used in the emergency disengagement verification method include a release hook and a shackle.

Claims

1. An emergency disengagement verification method, characterized in that, Includes the following steps: Step S1: Fix at least one motion reference unit on the lifting device under test to collect motion data of the lifting device under test; suspend a target weight on the sling of the lifting device under test, and suspend at least one detachable weight with a detachment device directly or indirectly on the sling; Step S2: After using the lifting device under test to lift the target weight and the detachable weight, trigger the detachment device at least once to change the tension on the sling.

2. The emergency disengagement verification method according to claim 1, characterized in that: The motion reference unit is fixed to the rotary platform and / or boom of the lifting device under test; The motion data collected by the motion reference unit for the lifting device under test includes: the attitude angle and translational motion of the lifting device under test.

3. The emergency disengagement verification method according to claim 1, characterized in that: The detachable weight includes a first detachable weight and a second detachable weight; step S2 includes the following: Step S2.1: When the tension output by the lifting device under test is not greater than the sum of the first detachable weight, the second detachable weight, the target weight, and the weight it bears, continue to increase the tension output by the lifting device under test. Step S2.2: After the pulling force output by the lifting device under test is greater than the sum of the gravity of the first detachable weight, the second detachable weight and the target weight, the detachment device of the second detachable weight is triggered, so that the second detachable weight is detached from the sling.

4. The emergency disengagement verification method according to claim 3, characterized in that: Step S2 also includes the following: Step S2.3a: After the second detachable weight is detached from the sling, the pulling force output by the lifting device to be tested is adjusted to be greater than the weight of the target weight and less than the sum of the weights of the first detachable weight and the target weight. Then, the detachment device of the first detachable weight is triggered to detach the first detachable weight.

5. The emergency disengagement verification method according to claim 3, characterized in that: Step S2 also includes the following: Step S2.3b: After the second detachable weight is detached from the sling, the tension output by the lifting device to be tested is adjusted to be greater than the weight of the target weight and less than the sum of the weights of the first detachable weight and the target weight, and then the detachment device of the first detachable weight is triggered; the first detachable weight does not detach from the sling, but the gravity it is subjected to continuously decreases until it no longer changes.

6. The emergency disengagement verification method according to claim 4 or 5, characterized in that: It also includes step S3: after triggering the release device of the first detachable weight, add a buoyancy compensation weight to the sling.

7. The emergency disengagement verification method according to claim 1, characterized in that: The release device includes a release hook and a shackle.

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