Self-righting auxiliary recovery device for maritime lifeboat

Abstract

The invention discloses a self-righting auxiliary recovery device for a maritime lifeboat. Comprising a boat bottom outer bracket; the boat bottom lining frame is arranged in the boat bottom outer bracket in a swinging manner through a radial buffer mechanism; the front end of the boat bottom lining frame is hinged to the front end of the boat bottom outer bracket through a connecting pin. An inlet for allowing the lifeboat to enter is formed in the rear part of the boat bottom lining frame; the axial buffer spring is arranged on the connecting pin in a sleeving mode, one end of the axial buffer spring abuts against the inner wall of the boat bottom outer bracket, and the other end of the axial buffer spring abuts against the outer wall of the boat bottom lining frame; the anti-backing self-locking mechanisms are arranged on the two sides of the inlet; and the lifting mechanism is connected with the boat bottom outer bracket. The self-righting and anti-reversing self-locking lifeboat has the beneficial effects that the lifeboat bottom outer bracket, the lifeboat bottom lining frame, the radial buffering mechanism, the axial buffering spring, the anti-reversing self-locking mechanism and the lifting mechanism are arranged, and self-righting and anti-reversing self-locking can be achieved in the lifeboat recycling process.

Description

Technical Field

[0001] The present invention relates to the technical field of lifeboat recovery, in particular to a self-righting auxiliary recovery device for a marine lifeboat. Background Art

[0002] The current method for recovering lifeboats from offshore platforms after a waterborne journey is to manually maneuver the boat to the platform's davit and retrieve it using a manual grappling hook and hook. This operation is significantly affected by weather and sea conditions, as well as the individual's skill level, resulting in a low success rate. Furthermore, frequent docking of lifeboats to platforms 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 seas are affected by the monsoon climate, resulting in significant uncertainty in wind speeds, ocean currents, and laminar flow. However, lifeboats are unconventional marine equipment, lacking a built-in ballast system. Swells cause the boats to pitch and roll violently, resulting in low stability and control accuracy. This is one of the main reasons why crews are unable to accurately and quickly hook the boat.

[0005] 2) Defects of existing davit recovery devices

[0006] The existing davit recovery ring has a narrow adjustable length. If the ring is lowered, it can collide with the hull or even become entangled in the propeller, damaging the propulsion system. If it is lowered, sailors cannot properly hook the ring, missing the opportunity to dock. If only a single hook is attached for a long period of time, the hull can be damaged due to unbalanced load points at the bow and stern.

[0007] 3) Personnel technical level and physiological response

[0008] The lifeboat's water navigation test cycle lasts for one year. Due to the low frequency of practical operation, the operator and captain are unable to continuously deepen their proficiency in lifeboat operation. In particular, the coordination and synchronization of the two hooking sailors at the bow and stern cannot be significantly improved in a short period of time. Furthermore, the prolonged and intense rolling and pitching of the boat causes severe seasickness and vomiting among the crew, further affecting the timeliness of the boat recovery operation.

[0009] Therefore, a self-righting auxiliary recovery device for a marine lifeboat that can achieve self-righting and anti-backward self-locking during the recovery process of the lifeboat becomes the key to solving the problem. Summary of the Invention

[0010] The object of the present invention is to provide a self-righting auxiliary recovery device for a marine lifeboat, which is provided with an outer bottom bracket, an inner bottom liner frame, a radial buffer mechanism, an axial buffer spring, an anti-reverse self-locking mechanism and a lifting mechanism, and can achieve self-righting and anti-reverse self-locking during the process of recovering the lifeboat.

[0011] To achieve the above object, the present invention adopts the following technical solutions, including:

[0012] Outboard brackets;

[0013] The bottom liner frame is swingably arranged in the bottom outer bracket through a radial buffer mechanism; the front end of the bottom liner frame is hinged to the front end of the bottom outer bracket through a connecting pin; and an entrance for a lifeboat is provided at the rear of the bottom liner frame;

[0014] an axial buffer spring, which is sleeved on the connecting pin, with one end of the axial buffer spring abutting against the inner wall of the outer bracket of the bottom of the boat, and the other end abutting against the outer wall of the inner liner of the bottom of the boat; and is used to offset the axial impact of the lifeboat entering the inner liner of the bottom of the boat;

[0015] an anti-backward self-locking mechanism, which is provided on both sides of the inlet and is used to prevent the lifeboat from exiting the bottom liner frame after the lifeboat enters the bottom liner frame;

[0016] A lifting mechanism is connected to the outer bottom bracket of the boat and is used for lifting the outer bottom bracket of the boat.

[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 axial hole is provided at the open end of the slot; and a second axial hole is provided in the middle of the slot;

[0019] A pair of L-shaped baffles, each having a first rotating shaft provided at its bend, both ends of the first rotating shaft being inserted into the first shaft hole respectively; the L-shaped baffles are rotatably arranged at the open ends of the slots via the first rotating shaft respectively;

[0020] A pair of stoppers, wherein a third axial hole is provided in the middle portion thereof and a second inclined surface adapted to the first inclined surface is provided at the end of the stoppers;

[0021] a second rotating shaft, wherein the middle portion thereof passes through the third shaft hole, and both ends of the second rotating shaft are respectively inserted into the second shaft holes; and the stoppers are rotatably disposed in the middle portion of the slots through the second rotating shafts.

[0022] a return spring, which is sleeved on the second rotating shaft and is used to drive the stopper to return to its original position so that the length direction of the stopper is parallel to the length direction of the slot;

[0023] Among them, when the front end of the lifeboat enters the bottom liner frame, the L-shaped baffles on both sides rotate outwards under the impact of the lifeboat; during the outward rotation of the L-shaped baffle, the stopper is pushed to rotate outward, thereby avoiding the lifeboat and allowing the lifeboat to enter the bottom liner frame; after the lifeboat completely enters the bottom liner frame, the force of the lifeboat on the L-shaped baffle disappears, and the reset spring drives the stopper to reset; when the lifeboat retreats under the action of waves, it hits the L-shaped baffle again, but because the second inclined surface cooperates with the first inclined surface, the stopper cannot rotate inwards in one step, and the stopper then prevents the L-shaped baffle from rotating inwards, and the L-shaped baffle prevents the lifeboat from retreating, thereby realizing anti-backward self-locking.

[0024] Preferably, it also includes:

[0025] A limiting stop post is provided on the outer side of the bending portion of the L-shaped baffle and is used to cooperate with the groove wall of the slot to limit the rotation angle of the L-shaped baffle;

[0026] The reinforcing ribs are arranged on the L-shaped baffle and are used to increase the strength of the L-shaped baffle.

[0027] Preferably, the radial buffer mechanism comprises:

[0028] an arc-shaped chute, which is transversely arranged in the middle of the inner end surface of the outer bracket of the bottom of the boat;

[0029] An arc-shaped sliding block is transversely arranged at the middle of the outer end surface of the boat bottom liner frame and is adapted to the arc-shaped sliding groove;

[0030] Wherein, a detachable damping strip is provided on the side wall of the arc-shaped slide groove; and a gap is provided between the side wall of the arc-shaped slide groove and the arc-shaped sliding block.

[0031] Preferably, two arc-shaped slide grooves are transversely arranged in the middle of the inner end surface of the outer bracket of the bottom of the boat, and two arc-shaped sliders are transversely arranged in the middle of the outer end surface of the inner liner of the bottom of the boat; the arc-shaped slide grooves correspond to the arc-shaped sliders one by one; the cross-sections of the arc-shaped slide grooves and the arc-shaped sliders are T-shaped.

[0032] Preferably, a first through hole is provided at the front center of the outer bottom bracket; a second through hole is provided at the front center of the bottom liner frame; the connecting pin passes through the first through hole and the second through hole in sequence to hinge the bottom liner frame to the outer bottom bracket.

[0033] Preferably, it further includes: a counterweight block, which is arranged on the mid-vertical line of the outer end surface of the bottom liner frame and is used to adjust the center of gravity of the bottom liner frame to the mid-vertical line.

[0034] Preferably, the lifting mechanism comprises:

[0035] a pry arm, the middle portion of which is hinged to the side deck of the platform, and one end of which is fixedly connected to the outer end surface of the outer bracket of the bottom of the boat;

[0036] An electric recovery winch is connected to the other end of the pry arm through a steel wire rope and is used to control the lifting and lowering of the outer bracket on the bottom of the boat through the pry arm.

[0037] Preferably, a buffer pad is provided on the inner end surface of the boat bottom liner frame.

[0038] Preferably, the spring 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 the present invention are that self-righting and anti-backward self-locking can be achieved during the process of recovering the lifeboat. BRIEF DESCRIPTION OF THE DRAWINGS

[0040] Figure 1 It is a perspective view of the self-righting auxiliary recovery device for marine lifeboats of the present invention.

[0041] Figure 2 This is an exploded view of the self-righting auxiliary recovery device for marine lifeboats of the present invention.

[0042] Figure 3 It is a three-dimensional diagram of the outer bracket of the boat bottom in the present invention.

[0043] Figure 4 It is a three-dimensional diagram of the boat bottom liner frame in the present invention.

[0044] Figure 5 It is a three-dimensional diagram of the connecting pin and the axial buffer spring in the present invention.

[0045] Figure 6 It is a three-dimensional diagram of the L-shaped baffle in the present invention.

[0046] Figure 7 It is a three-dimensional diagram of the stopper in the present invention. DETAILED DESCRIPTION

[0047] The invention will be described in further detail below with reference to the accompanying drawings so that those skilled in the art can implement the invention with reference to the description.

[0048] It should be understood that terms such as “having”, “including” and “comprising” used herein do not exclude the existence or addition of one or other elements or combinations thereof.

[0049] like Figure 1-7 As shown, a self-righting auxiliary recovery device 1 for a marine lifeboat of the present invention comprises:

[0050] Outer bottom bracket 110;

[0051] The bottom liner frame 120 is swingably arranged in the bottom outer bracket 110 through a radial buffer mechanism; the front end of the bottom liner frame 120 is hinged to the front end of the bottom outer bracket 110 through a connecting pin 131; an entrance 122 for a lifeboat to enter is provided at the rear of the bottom liner frame 120; as a preferred embodiment, the radial buffer mechanism includes: an arcuate slide 161, which is transversely arranged in the middle of the inner end surface of the bottom outer bracket 110; an arcuate slider 162, which is transversely arranged in the middle of the outer end surface of the bottom liner frame 120 and is adapted to the arcuate slide 161; wherein, a detachable damping strip is provided on the side wall of the arcuate slide 161; and a gap is provided between the side wall of the arcuate slide 161 and the arcuate slider 162. As a further advantage, a first through-hole 111 is provided at the front center of the outer bottom bracket 110; a second through-hole 121 is provided at the front center of the inner bottom liner frame 120; a connecting pin 131 passes through the first through-hole 111 and the second through-hole 121, hingedly connecting the inner bottom liner frame 120 to the outer bottom bracket 110. As a further advantage, a counterweight is provided on the mid-perpendicular line of the outer end surface of the inner bottom liner frame 120 to adjust the center of gravity of the inner bottom liner frame 120 to the mid-perpendicular 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 bottom outer bracket 110, and the other end abuts against the outer wall of the bottom liner 120. The axial buffer spring 132 is used to offset the axial impact of the lifeboat entering the bottom liner 120.

[0053] The anti-backward self-locking mechanism 140 is provided on both sides of the inlet 122 and is used to prevent the lifeboat from exiting the bottom liner frame 120 after the lifeboat enters the bottom liner frame 120; as a preferred embodiment, the anti-backward self-locking mechanism 140 includes: a pair of slots 123, which 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 axial hole is provided at the open end of the slot 123; a second axial hole is provided in the middle of the slot 123; a pair of L-shaped baffles 142, which are folded A first rotating shaft 142a is provided at the bend, and both ends of the first rotating shaft 142a are respectively inserted into the first shaft hole; the L-shaped baffle 142 is rotatably arranged at the open end of the slot 123 through the first rotating shaft 142a; a pair of stoppers 143, wherein the middle portion is provided with a third shaft hole, and the end of the stopper 143 is provided with a second inclined surface 143a adapted to the first inclined surface; the middle portion of the second rotating shaft 144 passes through the third shaft hole, and the two ends of the second rotating shaft 144 are respectively inserted into the second shaft hole; the stoppers 143 are respectively provided with a second inclined surface 143a adapted to the first inclined surface. The stopper 143 is rotatably arranged in the middle of the slot 123 through the second rotating shaft 143; the reset spring 145 is sleeved on the second rotating shaft 144 and is used to drive the stopper 143 to reset so that the length direction of the stopper 143 is parallel to the length direction of the slot 123; wherein, when the front end of the lifeboat enters the bottom liner frame 120, the L-shaped baffles 142 on both sides rotate outwards under the impact of the lifeboat; the L-shaped baffles 142 push the stopper 143 to rotate outwards during the outward rotation process, thereby avoiding the lifeboat and allowing the lifeboat to enter The bottom liner frame 120 is configured such that when the lifeboat fully enters the bottom liner frame 120, the force exerted by the lifeboat on the L-shaped baffle 142 disappears, and the return spring 145 drives the stopper 143 to reset. When the lifeboat retreats under the action of waves, it strikes the L-shaped baffle 142 again. However, the second inclined surface 143a cooperates with the first inclined surface 123a, preventing the stopper 143 from rotating inwards. The stopper 143 then prevents the L-shaped baffle 142 from rotating inwards, and the L-shaped baffle 142 prevents the lifeboat from retreating, thus achieving a self-locking anti-reverse mechanism. Further preferably, the device further includes: a limit stopper 146 disposed on the outer side of the bend of the L-shaped baffle 142, configured to cooperate with the wall of the slot 123 to limit the rotation angle of the L-shaped baffle 142; and a reinforcing rib 142b disposed on the L-shaped baffle 142 to increase its strength.

[0054] A lifting mechanism 150 is connected to the outer bottom bracket 110 and is used to lift the outer bottom bracket 110. Preferably, the lifting mechanism 150 includes: a pry arm 151, the middle portion of which is hinged to the platform side deck, and one end of the pry arm 151 is fixedly connected to the outer end surface of the outer bottom bracket 110; and an electric recovery winch, which is connected to the other end of the pry arm 151 via a steel wire rope 152 and is used to control the lifting and lowering of the outer bottom bracket 110 via the pry arm 151.

[0055] During use, the lifeboat is maneuvered into the bottom liner frame 120. The anti-backward self-locking mechanism 140 prevents the lifeboat from exiting the bottom liner frame 120 after entering. Driven by the lifeboat, the bottom liner frame 120 and the outer bottom bracket 110 undergo axial movement. The axial buffer spring 132 offsets the axial impact of the lifeboat entering the bottom liner frame 120. Simultaneously, the bottom liner frame 120 swings along the curved chute 161, achieving self-righting while absorbing radial impact. The lifting mechanism 150 then raises the outer bottom bracket 110, lifting the lifeboat out of the water. When the lifeboat is at rest and level, the sailors at the bow / stern end quickly hook the davit buckle onto the bow / stern main lifting hook, smoothly activating the davit winch and retrieving the lifeboat to the platform, where it is suspended and secured.

[0056] In another embodiment, the anti-backward self-locking mechanism 140 includes:

[0057] A pair of slots 123 are 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 axial hole is provided at the open end of the slot 123; and a second axial hole is provided in the middle of the slot 123;

[0058] A pair of L-shaped baffles 142, each having a first rotating shaft 142a at its bend, and both ends of the first rotating shaft 142a are respectively inserted into the first shaft hole; the L-shaped baffles 142 are rotatably arranged at the open end of the slot 123 through the first rotating shaft 142a;

[0059] A pair of stoppers 143, wherein a third axial hole is provided in the middle thereof, and a second inclined surface 143a adapted to the first inclined surface is provided at the end of the stoppers 143;

[0060] The second rotating shaft 144 has its middle portion passing through the third shaft hole, and both ends of the second rotating shaft 144 are respectively inserted into the second shaft holes; the stoppers 143 are rotatably disposed in the middle of the slot 123 through the second rotating shaft 143;

[0061] a return spring 145 , which is sleeved on the second rotating shaft 144 and is used to drive the stopper 143 to return to its original position so that the length direction of the stopper 143 is parallel to the length direction of the slot 123 ;

[0062] Among them, when the front end of the lifeboat enters the bottom liner frame 120, the L-shaped baffles 142 on both sides rotate outwards under the impact of the lifeboat; during the outward rotation of the L-shaped baffle 142, the stopper 143 is pushed to rotate outwards, thereby avoiding the lifeboat and allowing the lifeboat to enter the bottom liner frame 120; after the lifeboat completely enters the bottom liner frame 120, the force of the lifeboat on the L-shaped baffle 142 disappears, and the return spring 145 drives the stopper 143 to reset; when the lifeboat retreats under the action of waves, it hits the L-shaped baffle 142 again, but because the second inclined surface 143a cooperates with the first inclined surface 123a, the stopper 143 cannot rotate inwards in one step, and the stopper 143 then prevents the L-shaped baffle 142 from rotating inwards, and the L-shaped baffle 142 prevents the lifeboat from retreating, thereby achieving anti-backward self-locking. When the lifeboat is removed, the stopper 143 can be pressed to rotate outward, and the L-shaped baffle 142 can be rotated inward to the inner side of the boat bottom liner frame 120, and then the stopper 143 can be released, and the return spring 145 can drive the stopper 143 to return to its original position.

[0063] In another embodiment, it also includes: a limiting stop column 146, which is arranged on the outside of the bend of the L-shaped baffle 142, and is used to cooperate with the groove wall of the groove 123 to limit the rotation angle of the L-shaped baffle 142; a reinforcing rib 142b, which is arranged on the L-shaped baffle 142, and is used to increase the strength of the L-shaped baffle 142.

[0064] In another embodiment, the radial buffer mechanism includes: an arcuate chute 161 transversely disposed in the middle of the inner end surface of the outer bottom bracket 110; and an arcuate slider 162 transversely disposed in the middle of the outer end surface of the bottom liner 120 and adapted to fit within the arcuate chute 161. Removable damping strips are provided on the sidewalls of the arcuate chute 161, and a gap is provided between the sidewalls of the arcuate chute 161 and the arcuate slider 162. Preferably, the friction coefficient of the arcuate chute 161 can be adjusted by adjusting the damping strips with different friction coefficients.

[0065] In another embodiment, two arc-shaped sliding grooves 161 are transversely provided in the middle of the inner end surface of the outer bottom bracket 110, and two arc-shaped sliding blocks 162 are transversely provided in the middle of the outer end surface of the bottom liner frame 120; the arc-shaped sliding grooves 161 and the arc-shaped sliding blocks 162 correspond one to one; the cross-sections of the arc-shaped sliding grooves 161 and the arc-shaped sliding blocks 162 are T-shaped.

[0066] In another embodiment, a first through hole 111 is provided at the front center of the outer bottom bracket 110; a second through hole 121 is provided at the front center of the bottom 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 bottom liner frame 120 to the outer bottom bracket 110.

[0067] In another embodiment, it further includes: a counterweight block, which is arranged on the mid-vertical line of the outer end surface of the bottom liner frame 120 and is used to adjust the center of gravity of the bottom liner frame 120 to the mid-vertical line.

[0068] In another embodiment, the lifting mechanism 150 includes:

[0069] A pry arm 151, the middle of which is hinged to the side deck of the platform, and one end of the pry arm 151 is fixedly connected to the outer end surface of the bottom outer bracket 110;

[0070] The electric recovery winch is connected to the other end of the pry arm 151 through a steel wire rope 152 and is used to control the lifting and lowering of the outer bottom bracket 110 through the pry arm 151.

[0071] In another embodiment, a buffer pad 124 is provided on the inner end surface of the boat bottom liner frame 120 .

[0072] In another embodiment, the spring constant of the axial buffer spring 123 is 0.7-12.0; and the elastic coefficient of the buffer pad 124 is 0.36-0.55.

[0073] In summary, the self-righting auxiliary recovery device 1 for a marine lifeboat of the present invention can achieve self-righting and anti-reverse self-locking during the recovery process of the lifeboat.

[0074] Although the embodiments of the present invention have been disclosed above, they are not limited to the applications listed in the description and implementation methods. They can be fully applied to various fields suitable for the present invention. For those familiar with the art, additional modifications can be easily implemented. Therefore, without departing from the general concept defined by the claims and the scope of equivalents, the present invention is not limited to the specific details and illustrations shown and described herein.

Claims

1. A self-righting auxiliary recovery device for a marine lifeboat, characterized in that: include: Outboard brackets; The bottom liner frame is swingably arranged in the bottom outer bracket through a radial buffer mechanism; the front end of the bottom liner frame is hinged to the front end of the bottom outer bracket through a connecting pin; and an entrance for a lifeboat is provided at the rear of the bottom liner frame; an axial buffer spring, which is sleeved on the connecting pin, with one end of the axial buffer spring abutting against the inner wall of the outer bracket of the bottom of the boat, and the other end abutting against the outer wall of the inner liner of the bottom of the boat; and is used to offset the axial impact of the lifeboat entering the inner liner of the bottom of the boat; an anti-backward self-locking mechanism, which is provided on both sides of the inlet and is used to prevent the lifeboat from exiting the bottom liner frame after the lifeboat enters the bottom liner frame; A lifting mechanism is connected to the outer bottom bracket of the boat and is used for lifting the outer bottom bracket of the boat.

2. The self-righting auxiliary recovery device for a lifeboat at sea 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 opening; a first inclined surface is provided at the blind end of the slot; a first axial hole is provided at the open end of the slot; and a second axial hole is provided in the middle of the slot; A pair of L-shaped baffles, each having a first rotating shaft provided at its bend, both ends of the first rotating shaft being inserted into the first shaft hole respectively; the L-shaped baffles are rotatably arranged at the open ends of the slots via the first rotating shaft respectively; A pair of stoppers, wherein a third axial hole is provided in the middle portion thereof and a second inclined surface adapted to the first inclined surface is provided at the end of the stoppers; a second rotating shaft, wherein the middle portion thereof passes through the third shaft hole, and both ends of the second rotating shaft are respectively inserted into the second shaft holes; and the stoppers are rotatably disposed in the middle portion of the slots through the second rotating shafts. a return spring, which is sleeved on the second rotating shaft and is used to drive the stopper to return to its original position so that the length direction of the stopper is parallel to the length direction of the slot; Among them, when the front end of the lifeboat enters the bottom liner frame, the L-shaped baffles on both sides rotate outwards under the impact of the lifeboat; during the outward rotation of the L-shaped baffle, the stopper is pushed to rotate outward, thereby avoiding the lifeboat and allowing the lifeboat to enter the bottom liner frame; after the lifeboat completely enters the bottom liner frame, the force of the lifeboat on the L-shaped baffle disappears, and the reset spring drives the stopper to reset; when the lifeboat retreats under the action of waves, it hits the L-shaped baffle again, but because the second inclined surface cooperates with the first inclined surface, the stopper cannot rotate inwards in one step, and the stopper then prevents the L-shaped baffle from rotating inwards, and the L-shaped baffle prevents the lifeboat from retreating, thereby realizing anti-backward self-locking.

3. The self-righting auxiliary recovery device for a lifeboat at sea according to claim 2, characterized in that: Also includes: A limiting stop post is provided on the outer side of the bending portion of the L-shaped baffle and is used to cooperate with the groove wall of the slot to limit the rotation angle of the L-shaped baffle; The reinforcing ribs are arranged on the L-shaped baffle and are used to increase the strength of the L-shaped baffle.

4. The self-righting auxiliary recovery device for a lifeboat at sea according to claim 1, characterized in that: The radial buffer mechanism comprises: an arc-shaped chute, which is transversely arranged in the middle of the inner end surface of the outer bracket of the bottom of the boat; An arc-shaped sliding block is transversely arranged at the middle of the outer end surface of the boat bottom liner frame and is adapted to the arc-shaped sliding groove; Wherein, a detachable damping strip is provided on the side wall of the arc-shaped slide groove; and a gap is provided between the side wall of the arc-shaped slide groove and the arc-shaped sliding block.

5. The self-righting auxiliary recovery device for a marine lifeboat according to claim 4, characterized in that: Two arc-shaped slide grooves are horizontally arranged in the middle of the inner end surface of the outer bracket of the bottom of the boat, and two arc-shaped sliders are horizontally arranged in the middle of the outer end surface of the inner liner of the bottom of the boat; the arc-shaped slide grooves correspond to the arc-shaped sliders one by one; the cross-sections of the arc-shaped slide grooves and the arc-shaped sliders are T-shaped.

6. The self-righting auxiliary recovery device for a marine lifeboat according to claim 1, characterized in that: A first through hole is provided at the front center of the outer bottom bracket; a second through hole is provided at the front center of the inner bottom liner; the connecting pin passes through the first through hole and the second through hole in sequence to hinge the inner bottom liner and the outer bottom bracket.

7. The self-righting auxiliary recovery device for a marine lifeboat according to claim 1, characterized in that: Also includes: A counterweight block is arranged on the mid-vertical line of the outer end surface of the boat bottom liner frame and is used to adjust the center of gravity of the boat bottom liner frame to the mid-vertical line.

8. The self-righting auxiliary recovery device for a marine lifeboat according to claim 1, characterized in that: The lifting mechanism comprises: a pry arm, the middle portion of which is hinged to the side deck of the platform, and one end of which is fixedly connected to the outer end surface of the outer bracket of the bottom of the boat; An electric recovery winch is connected to the other end of the pry arm through a steel wire rope and is used to control the lifting and lowering of the outer bracket on the bottom of the boat through the pry arm.

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 surface of the boat bottom liner frame.

10. The self-righting auxiliary recovery device for a marine lifeboat according to claim 9, characterized in that: The spring coefficient of the axial buffer spring is 0.7 to 12.0; the elastic coefficient of the buffer pad is 0.36 to 0.55.

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