Self-righting auxiliary recovery device for maritime lifeboat
By employing an external support frame, internal liner frame, buffer, and self-locking mechanism on the bottom of the lifeboat during recovery, the stability and safety issues during the recovery process of the lifeboat at sea have been solved, achieving self-righting and anti-reverse self-locking, thus improving the accuracy and safety of the recovery.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- ZHANJIANG BRANCH OF CHINA NATIONAL OFFSHORE OIL CORP
- Filing Date
- 2025-06-06
- Publication Date
- 2026-04-24
AI Technical Summary
The current recovery process of marine lifeboats is greatly affected by weather and sea conditions, has poor hull stability, is inaccurate in handling, is difficult to operate manually, and poses a risk of marine damage. In addition, the existing boat frame device has a small adjustment threshold, making it difficult to achieve accurate and rapid recovery.
The lifeboat employs an external support frame, an internal liner frame, a radial buffer mechanism, an axial buffer spring, an anti-reverse self-locking mechanism, and a lifting mechanism to achieve self-righting and anti-reverse self-locking of the lifeboat. The combination of an arc-shaped slide, an L-shaped baffle, and a return spring ensures the stability and safety of the lifeboat during the recovery process.
It enables the lifeboat to self-right and anti-tipping self-locking during the recovery process, improving the stability and safety of the recovery, and reducing the difficulty of manual operation and the risk of marine damage.
Smart Images
Figure CN224159399U_ABST
Abstract
Description
Technical Field
[0001] This utility model relates to the field of lifeboat recovery technology, and in particular to a self-righting auxiliary recovery device for marine lifeboats. Background Technology
[0002] Currently, the method used for recovering lifeboats from offshore platforms after they have navigated the water is manual, involving maneuvering the lifeboats to berth beneath the platform's hull and then manually using hooks and grapples. This operation is highly susceptible to weather and sea conditions, as well as the skill level of the individual boat handlers, resulting in a low success rate. Furthermore, frequent berthing of lifeboats at the platform increases the risk of marine damage to platform facilities, primarily in the following ways:
[0003] 1) Greatly affected by weather and sea conditions
[0004] Most of my country's sea areas are affected by monsoon climates, resulting in significant uncertainties in wind speed, ocean currents, and laminar currents. However, lifeboats are not conventional vessel equipment and lack a built-in ballast system. The hull is subjected to severe pitching and rolling due to swells, leading to lower stability and maneuverability. This is one of the main reasons why personnel cannot accurately and quickly hook onto the lifeboat.
[0005] 2) Defects in existing boat frame recycling devices
[0006] The existing boat frame has a relatively small adjustable threshold for the length of the retrieval hook. If the retrieval hook is placed too low, it will directly collide with the hull or even get caught in the propeller, causing damage to the propulsion system. If it is placed too high, the sailors will not be able to grab the hook and put it on the hook, missing the opportunity to berth. If only a single hook is used for a long time, the hull structure will be damaged due to the imbalance of stress points at the bow and stern.
[0007] 3) Personnel's technical skills and physiological responses
[0008] The lifeboat's on-water navigation test cycle is one year. Due to the low frequency of practical operation, the boat operators and captains cannot continuously improve their proficiency in operating the lifeboat. In particular, the synchronization and coordination between the two hook-up sailors at the bow and stern cannot be significantly improved in a short period of time. At the same time, the prolonged and severe rolling and pitching of the boat cause severe seasickness, vomiting, and other physiological reactions among the crew, further affecting the timeliness of the lifeboat recovery operation.
[0009] Therefore, a self-righting auxiliary recovery device for marine lifeboats that can achieve self-righting and anti-tipping self-locking during the recovery process has become the key to solving the problem. Utility Model Content
[0010] The purpose of this utility model is to provide a self-righting auxiliary recovery device for a marine lifeboat, which is equipped with an outer support frame on the bottom of the boat, an inner liner frame on the bottom of the boat, a radial buffer mechanism, an axial buffer spring, an anti-backward self-locking mechanism, and a lifting mechanism, which can achieve self-righting and anti-backward self-locking during the recovery of the lifeboat.
[0011] To achieve the above objectives, the present invention adopts the following technical solution, including:
[0012] Outer support frame at the bottom of the boat;
[0013] The hull liner is pivotally mounted within the hull outer support frame via a radial buffer mechanism; the front end of the hull liner is hinged to the front end of the hull outer support frame via a connecting pin; an entrance for the lifeboat is provided at the rear of the hull liner.
[0014] An axial buffer spring is sleeved on the connecting pin. One end of the axial buffer spring abuts against the inner wall of the outer support frame of the hull bottom, and the other end abuts against the outer wall of the inner liner frame of the hull bottom; it is used to offset the axial impact of the lifeboat entering the inner liner frame of the hull bottom.
[0015] An anti-reverse self-locking mechanism is provided on both sides of the inlet to prevent the lifeboat from exiting the bottom liner after it has entered the liner.
[0016] A lifting mechanism, which is connected to the outer support frame of the hull, is used to lift the outer support frame of the hull.
[0017] Preferably, the anti-backward self-locking mechanism includes:
[0018] A pair of slots are respectively provided on both sides of the opening; a first inclined surface is provided at the blind end of the slot; a first shaft hole is provided at the opening end of the slot; and a second shaft hole is provided in the middle of the slot.
[0019] A pair of L-shaped baffles are provided with a first rotating shaft at the bend, and the two ends of the first rotating shaft are respectively inserted into the first shaft hole; the L-shaped baffles are respectively rotatably set at the opening end of the slot through the first rotating shaft;
[0020] A pair of stops, each having a third shaft hole in its middle and a second inclined surface adapted to the first inclined surface at its end;
[0021] The second rotating shaft has its middle portion passing through the third shaft hole, and its two ends are respectively inserted into the second shaft hole; the stop blocks are respectively rotatably disposed in the middle of the slot via the second rotating shaft;
[0022] A reset spring is sleeved on the second rotating shaft and is used to drive the stop block to reset so that the length direction of the stop block is parallel to the length direction of the slot.
[0023] When the front of the lifeboat enters the liner frame at the bottom of the boat, the L-shaped baffles on both sides rotate outward under the impact of the lifeboat. During the outward rotation of the L-shaped baffles, the blocking blocks rotate outward to avoid the lifeboat and allow it to enter the liner frame at the bottom of the boat. After the lifeboat is completely inside the liner frame at the bottom of the boat, the force exerted by the lifeboat on the L-shaped baffles disappears, and the return spring drives the blocking blocks to return to their original position. When the lifeboat moves backward under the action of the waves, it impacts the L-shaped baffles again, but because the second inclined surface cooperates with the first inclined surface, the blocking blocks cannot rotate inward in one step. The blocking blocks then prevent the L-shaped baffles from rotating inward, and the L-shaped baffles prevent the lifeboat from moving backward, thus achieving anti-backward self-locking.
[0024] Preferably, it also includes:
[0025] A limiting stop post is provided on the outside of the bend of the L-shaped baffle to cooperate with the groove wall of the slot and limit the rotation angle of the L-shaped baffle.
[0026] A reinforcing rib is provided on the L-shaped baffle to increase the strength of the L-shaped baffle.
[0027] Preferably, the radial buffer mechanism includes:
[0028] An arc-shaped sliding groove is laterally arranged in the middle of the inner end face of the outer support of the boat bottom;
[0029] An arc-shaped slider is laterally positioned at the middle of the outer end face of the inner liner of the boat bottom and is adapted to the arc-shaped sliding groove.
[0030] The arc-shaped slide groove has a detachable damping strip on its side wall; and a gap is provided between the side wall of the arc-shaped slide groove and the arc-shaped slider.
[0031] Preferably, two arc-shaped grooves are laterally arranged in the middle of the inner end face of the outer support of the hull bottom, and two arc-shaped sliders are laterally arranged in the middle of the outer end face of the inner liner of the hull bottom; the arc-shaped grooves and the arc-shaped sliders correspond one-to-one; the cross-sections of the arc-shaped grooves and the arc-shaped sliders are T-shaped.
[0032] Preferably, a first through hole is provided at the center of the front end of the outer support frame of the hull; a second through hole is provided at the center of the front end of the inner liner frame of the hull; the connecting pin passes through the first through hole and the second through hole in sequence to hinge the inner liner frame of the hull to the outer support frame of the hull.
[0033] Preferably, it further includes: a counterweight block, which is disposed on the vertical line of the outer end face of the hull liner frame, for adjusting the center of gravity of the hull liner frame to the vertical line.
[0034] Preferably, the lifting mechanism includes:
[0035] The pry arm is hinged to the side deck of the platform at its middle part, and one end of the pry arm is fixed to the outer end face of the outer support frame of the boat bottom.
[0036] An electric recovery winch, which is connected to the other end of the lever via a steel wire rope, is used to control the raising and lowering of the outer support frame on the bottom of the boat through the lever.
[0037] Preferably, a buffer pad is provided on the inner end face of the liner frame at the bottom of the boat.
[0038] Preferably, the spring stiffness coefficient of the axial buffer spring is 0.7 to 12.0; and the elastic coefficient of the buffer pad is 0.36 to 0.55.
[0039] The beneficial effects of this utility model are: it can achieve self-righting and anti-tipping self-locking during the recovery of the lifeboat. Attached Figure Description
[0040] Figure 1 This is a perspective view of the self-righting auxiliary recovery device for marine lifeboats according to this utility model.
[0041] Figure 2 This is an exploded view of the self-righting auxiliary recovery device for marine lifeboats according to this utility model.
[0042] Figure 3 This is a perspective view of the outer support frame of the boat bottom in this utility model.
[0043] Figure 4 This is a perspective view of the inner lining frame of the boat bottom in this utility model.
[0044] Figure 5 This is a perspective view of the connecting pin and the axial buffer spring in this utility model.
[0045] Figure 6 This is a perspective view of the L-shaped baffle in this utility model.
[0046] Figure 7 This is a perspective view of the stop block in this utility model. Detailed Implementation
[0047] The utility model will now be described in further detail with reference to the accompanying drawings, so that those skilled in the art can implement it based on the description.
[0048] It should be understood that terms such as “having,” “comprising,” and “including” as used herein do not exclude the presence or addition of one or more other elements or combinations thereof.
[0049] like Figure 1-7 As shown, the present invention provides a self-righting auxiliary recovery device 1 for a marine lifeboat, comprising:
[0050] 110-meter-long outer support frame at the bottom of the boat;
[0051] A bottom liner 120 is pivotally mounted within the bottom outer support 110 via a radial buffer mechanism; the front end of the bottom liner 120 is hinged to the front end of the bottom outer support 110 via a connecting pin 131; an inlet 122 for a lifeboat to enter is provided at the rear of the bottom liner 120; preferably, the radial buffer mechanism includes: an arc-shaped groove 161, which is laterally disposed in the middle of the inner end face of the bottom outer support 110; and an arc-shaped slider 162, which is laterally disposed in the middle of the outer end face of the bottom liner 120 and adapted to the arc-shaped groove 161; wherein a detachable damping strip is provided on the side wall of the arc-shaped groove 161; and a gap is provided between the side wall of the arc-shaped groove 161 and the arc-shaped slider 162. As a further preferred embodiment, a first through hole 111 is provided at the center of the front end of the outer support frame 110; a second through hole 121 is provided at the center of the front end of the inner liner frame 120; the connecting pin 131 passes through the first through hole 111 and the second through hole 121 in sequence, hinged to the inner liner frame 120 and the outer support frame 110. As a further preferred embodiment, a counterweight is provided on the vertical line of the outer end face of the inner liner frame 120, for adjusting the center of gravity of the inner liner frame 120 to the vertical line.
[0052] An axial buffer spring 132 is sleeved on the connecting pin 131. One end of the axial buffer spring 132 abuts against the inner wall of the outer support frame 110 of the hull bottom and the other end abuts against the outer wall of the inner liner frame 120 of the hull bottom; it is used to offset the axial impact of the lifeboat entering the inner liner frame 120 of the hull bottom.
[0053] An anti-reverse self-locking mechanism 140 is disposed on both sides of the inlet 122 to prevent the lifeboat from exiting the hull liner 120 after it has entered the hull liner 120. Preferably, the anti-reverse self-locking mechanism 140 includes: a pair of slots 123 respectively disposed on both sides of the opening 122; a first inclined surface 123a at the blind end of the slot 123; a first shaft hole at the open end of the slot 123; a second shaft hole in the middle of the slot 123; and a pair of L-shaped baffles 142. A first rotating shaft 142a is provided at the bend, with both ends of the first rotating shaft 142a inserted into the first shaft hole; the L-shaped baffles 142 are rotatably mounted at the opening end of the slot 123 via the first rotating shaft 142a; a pair of stop blocks 143 are provided with a third shaft hole in their middle portions, and a second inclined surface 143a adapted to the first inclined surface is provided at the end of the stop blocks 143; a second rotating shaft 144 passes through the third shaft hole in its middle portion, with both ends of the second rotating shaft 144 inserted into the second shaft hole; the stop blocks 143 are divided into... The stop block 143 is rotatably mounted in the middle of the slot 123 via the second rotating shaft 143; a return spring 145, sleeved on the second rotating shaft 144, is used to drive the stop block 143 to return to its original position, so that the length direction of the stop block 143 is parallel to the length direction of the slot 123; wherein, when the front end of the lifeboat enters the bottom liner 120, the L-shaped baffles 142 on both sides rotate outward under the impact of the lifeboat; during the outward rotation of the L-shaped baffles 142, the stop block 143 is pushed outward to avoid the lifeboat and allow the lifeboat to enter. Inside the hull liner 120; when the lifeboat is fully inside the hull liner 120, the force exerted by the lifeboat on the L-shaped baffle 142 disappears, and the return spring 145 drives the stop block 143 to reset; when the lifeboat moves backward under the action of the waves, it impacts the L-shaped baffle 142 again, but because the second inclined surface 143a cooperates with the first inclined surface 123a, the stop block 143 cannot rotate inward in one step, and the stop block 143 further prevents the L-shaped baffle 142 from rotating inward, and the L-shaped baffle 142 prevents the lifeboat from moving backward, realizing anti-backward self-locking. As a further preferred embodiment, it also includes: a limiting stop post 146, which is set on the outside of the bend of the L-shaped baffle 142, for cooperating with the groove wall of the slot 123 to limit the rotation angle of the L-shaped baffle 142; and a reinforcing rib 142b, which is set on the L-shaped baffle 142 to increase the strength of the L-shaped baffle 142.
[0054] A lifting mechanism 150 is connected to the outer support frame 110 at the bottom of the boat and is used to lift the outer support frame 110 at the bottom of the boat. Preferably, the lifting mechanism 150 includes: a lever 151, the middle portion of which is hinged to the side deck of the platform, one end of which is fixedly connected to the outer end face of the outer support frame 110 at the bottom of the boat; and an electric recovery winch, which is connected to the other end of the lever 151 via a wire rope 152, for controlling the lifting and lowering of the outer support frame 110 at the bottom of the boat via the lever 151.
[0055] During use, the lifeboat is driven into the hull inner liner 120. The anti-reverse self-locking mechanism 140 prevents the lifeboat from exiting the hull inner liner 120 after it enters. The hull inner liner 120 moves axially with the hull outer support 110 under the action of the lifeboat. The axial buffer spring 132 counteracts the axial impact of the lifeboat entering the hull inner liner 120. Simultaneously, the hull inner liner 120 swings along the arc-shaped groove 161, achieving self-righting while absorbing radial impact. At this point, the hull outer support 110 can be raised via the lifting mechanism 150, and the lifeboat is lifted out of the water. When the bow / stern sailors have the lifeboat in a stationary, horizontal position, they quickly engage the lifeboat frame buckle with the bow / stern lifting main hook, smoothly starting the lifeboat recovery winch to retrieve the lifeboat to a suspended position above the platform and secure it.
[0056] In another embodiment, the anti-backward self-locking mechanism 140 includes:
[0057] A pair of slots 123 are respectively provided on both sides of the opening 122; a first inclined surface 123a is provided at the blind end of the slot 123; a first shaft hole is provided at the open end of the slot 123; and a second shaft hole is provided in the middle of the slot 123.
[0058] A pair of L-shaped baffles 142 are provided with a first rotating shaft 142a at their bends, and the two ends of the first rotating shaft 142a are respectively inserted into the first shaft hole; the L-shaped baffles 142 are respectively rotatably disposed at the opening end of the slot 123 via the first rotating shaft 142a.
[0059] A pair of stops 143, each having a third shaft hole in its middle, and a second inclined surface 143a adapted to the first inclined surface at the end of the stops 143;
[0060] The second rotating shaft 144 has its middle part passing through the third shaft hole, and its two ends are respectively inserted into the second shaft hole; the stop blocks 143 are respectively rotatably disposed in the middle of the slot 123 via the second rotating shaft 143.
[0061] A reset spring 145 is sleeved on the second rotating shaft 144 and is used to drive the stop block 143 to reset, so that the length direction of the stop block 143 is parallel to the length direction of the slot 123.
[0062] When the front of the lifeboat enters the hull liner 120, the L-shaped baffles 142 on both sides rotate outward under the impact of the lifeboat. During the outward rotation of the L-shaped baffles 142, the stop block 143 is pushed outward to avoid the lifeboat and allow the lifeboat to enter the hull liner 120. After the lifeboat is completely inside the hull liner 120, the force exerted by the lifeboat on the L-shaped baffles 142 disappears, and the return spring 145 drives the stop block 143 to return to its original position. When the lifeboat moves backward under the action of the waves, it impacts the L-shaped baffles 142 again, but because the second inclined surface 143a cooperates with the first inclined surface 123a, the stop block 143 cannot rotate inward in one step. The stop block 143 then prevents the L-shaped baffles 142 from rotating inward, and the L-shaped baffles 142 prevent the lifeboat from moving backward, thus achieving anti-backward self-locking. After the lifeboat is removed, the stop block 143 can be pressed outward to rotate the L-shaped baffle 142 inward to the inner side of the bottom liner 120. Then, the stop block 143 can be released, and the return spring 145 will drive the stop block 143 to return to its original position.
[0063] In another embodiment, it further includes: a limiting stop 146, which is disposed on the outside of the bend of the L-shaped baffle 142, for cooperating with the groove wall of the slot 123 to limit the rotation angle of the L-shaped baffle 142; and a reinforcing rib 142b, which is disposed on the L-shaped baffle 142 to increase the strength of the L-shaped baffle 142.
[0064] In another embodiment, the radial buffer mechanism includes: an arc-shaped groove 161, which is laterally disposed at the center of the inner end face of the outer support frame 110 of the hull bottom; and an arc-shaped slider 162, which is laterally disposed at the center of the outer end face of the inner liner frame 120 of the hull bottom and is adapted to the arc-shaped groove 161; wherein, a detachable damping strip is provided on the side wall of the arc-shaped groove 161; and a gap is provided between the side wall of the arc-shaped groove 161 and the arc-shaped slider 162. Preferably, the friction coefficient of the arc-shaped groove 161 can be adjusted by adjusting the damping strips with different friction coefficients.
[0065] In another embodiment, two arc-shaped grooves 161 are laterally arranged in the middle of the inner end face of the outer support frame 110 of the hull bottom, and two arc-shaped sliders 162 are laterally arranged in the middle of the outer end face of the inner liner frame 120 of the hull bottom; the arc-shaped grooves 161 and the arc-shaped sliders 162 correspond one-to-one; the cross-sections of the arc-shaped grooves 161 and the arc-shaped sliders 162 are T-shaped.
[0066] In another embodiment, a first through hole 111 is provided at the center of the front end of the outer support frame 110; a second through hole 121 is provided at the center of the front end of the inner liner frame 120; the connecting pin 131 passes through the first through hole 111 and the second through hole 121 in sequence to hinge the inner liner frame 120 to the outer support frame 110.
[0067] In another embodiment, it further includes a counterweight block disposed on the vertical line of the outer end face of the hull liner 120, for adjusting the center of gravity of the hull liner 120 to the vertical line.
[0068] In another embodiment, the lifting mechanism 150 includes:
[0069] The pry bar 151 is hinged to the side deck of the platform at its middle part, and one end of the pry bar 151 is fixed to the outer end face of the outer support frame 110 at the bottom of the boat.
[0070] An electric recovery winch is connected to the other end of the lever 151 via a wire rope 152, and is used to control the raising and lowering of the hull bottom outer support 110 via the lever 151.
[0071] In another embodiment, a buffer pad 124 is provided on the inner end face of the hull liner 120.
[0072] In another embodiment, the spring stiffness coefficient of the axial buffer spring 123 is 0.7 to 12.0; and the elastic coefficient of the buffer pad 124 is 0.36 to 0.55.
[0073] In summary, the present invention provides a self-righting auxiliary recovery device 1 for marine lifeboats, which can achieve self-righting and anti-tipping self-locking during the recovery of lifeboats.
[0074] Although the embodiments of this utility model have been disclosed above, they are not limited to the applications listed in the specification and embodiments. They can be applied to various fields suitable for this utility model. For those skilled in the art, other modifications can be easily made. Therefore, without departing from the general concept defined by the claims and their equivalents, this utility model is not limited to the specific details and the illustrations shown and described herein.
Claims
1. A self-righting auxiliary recovery device for a marine lifeboat, characterized in that, include: Outer support frame at the bottom of the boat; The hull liner is pivotally mounted within the hull outer support frame via a radial buffer mechanism; the front end of the hull liner is hinged to the front end of the hull outer support frame via a connecting pin; an entrance for the lifeboat is provided at the rear of the hull liner. An axial buffer spring is sleeved on the connecting pin. One end of the axial buffer spring abuts against the inner wall of the outer support frame of the hull bottom, and the other end abuts against the outer wall of the inner liner frame of the hull bottom; it is used to offset the axial impact of the lifeboat entering the inner liner frame of the hull bottom. An anti-reverse self-locking mechanism is provided on both sides of the inlet to prevent the lifeboat from exiting the bottom liner after it has entered the liner. A lifting mechanism, which is connected to the outer support frame of the hull, is used to lift the outer support frame of the hull.
2. The self-righting auxiliary recovery device for marine lifeboats according to claim 1, characterized in that, The anti-backward self-locking mechanism includes: A pair of slots are respectively provided on both sides of the inlet; a first inclined surface is provided at the blind end of the slot; a first shaft hole is provided at the open end of the slot; and a second shaft hole is provided in the middle of the slot. A pair of L-shaped baffles are provided with a first rotating shaft at the bend, and the two ends of the first rotating shaft are respectively inserted into the first shaft hole; the L-shaped baffles are respectively rotatably set at the opening end of the slot through the first rotating shaft; A pair of stops, each having a third shaft hole in its middle and a second inclined surface adapted to the first inclined surface at its end; The second rotating shaft has its middle portion passing through the third shaft hole, and its two ends are respectively inserted into the second shaft hole; the stop blocks are respectively rotatably disposed in the middle of the slot via the second rotating shaft; A reset spring is sleeved on the second rotating shaft and is used to drive the stop block to reset so that the length direction of the stop block is parallel to the length direction of the slot. When the front of the lifeboat enters the liner frame at the bottom of the boat, the L-shaped baffles on both sides rotate outward under the impact of the lifeboat. During the outward rotation of the L-shaped baffles, the blocking blocks rotate outward to avoid the lifeboat and allow it to enter the liner frame at the bottom of the boat. After the lifeboat is completely inside the liner frame at the bottom of the boat, the force exerted by the lifeboat on the L-shaped baffles disappears, and the return spring drives the blocking blocks to return to their original position. When the lifeboat moves backward under the action of the waves, it impacts the L-shaped baffles again, but because the second inclined surface cooperates with the first inclined surface, the blocking blocks cannot rotate inward in one step. The blocking blocks then prevent the L-shaped baffles from rotating inward, and the L-shaped baffles prevent the lifeboat from moving backward, thus achieving anti-backward self-locking.
3. The self-righting auxiliary recovery device for marine lifeboats according to claim 2, characterized in that, Also includes: A limiting stop post is provided on the outside of the bend of the L-shaped baffle to cooperate with the groove wall of the slot and limit the rotation angle of the L-shaped baffle. A reinforcing rib is provided on the L-shaped baffle to increase the strength of the L-shaped baffle.
4. The self-righting auxiliary recovery device for marine lifeboats according to claim 1, characterized in that, The radial buffer mechanism includes: An arc-shaped sliding groove is laterally arranged in the middle of the inner end face of the outer support of the boat bottom; An arc-shaped slider is laterally positioned at the middle of the outer end face of the inner liner of the boat bottom and is adapted to the arc-shaped sliding groove. The arc-shaped slide groove has a detachable damping strip on its side wall; and a gap is provided between the side wall of the arc-shaped slide groove and the arc-shaped slider.
5. The self-righting auxiliary recovery device for a marine lifeboat according to claim 4, characterized in that: Two arc-shaped grooves are laterally arranged in the middle of the inner end face of the outer support of the hull bottom, and two arc-shaped sliders are laterally arranged in the middle of the outer end face of the inner liner of the hull bottom; the arc-shaped grooves and the arc-shaped sliders correspond one-to-one; the cross-sections of the arc-shaped grooves and the arc-shaped sliders are T-shaped.
6. The self-righting auxiliary recovery device for marine lifeboats according to claim 1, characterized in that: A first through hole is provided at the center of the front end of the outer support frame of the hull; a second through hole is provided at the center of the front end of the inner liner frame of the hull; the connecting pin passes through the first through hole and the second through hole in sequence to hinge the inner liner frame of the hull to the outer support frame of the hull.
7. The self-righting auxiliary recovery device for marine lifeboats according to claim 1, characterized in that, Also includes: A counterweight is provided on the vertical line of the outer end face of the hull liner frame to adjust the center of gravity of the hull liner frame to the vertical line.
8. The self-righting auxiliary recovery device for a marine lifeboat according to claim 1, characterized in that, The lifting mechanism includes: The pry arm is hinged to the side deck of the platform at its middle part, and one end of the pry arm is fixed to the outer end face of the outer support frame of the boat bottom. An electric recovery winch, which is connected to the other end of the lever via a steel wire rope, is used to control the raising and lowering of the outer support frame on the bottom of the boat through the lever.
9. The self-righting auxiliary recovery device for a marine lifeboat according to claim 1, characterized in that: A buffer pad is provided on the inner end face of the liner frame at the bottom of the boat.
10. The self-righting auxiliary recovery device for a marine lifeboat according to claim 9, characterized in that: The spring stiffness coefficient of the axial buffer spring is 0.7~12.0; the elastic coefficient of the buffer pad is 0.36~0.55.