CN114044093A

CN114044093A - Connecting rod type self-locking mechanism for keel block

Info

Publication number: CN114044093A
Application number: CN202111521773.0A
Authority: CN
Inventors: 魏金辉; 苏野
Original assignee: Cssc Luzhou Zhenjiang Marine Auxiliary Machinery Co ltd
Current assignee: Cssc Luzhou Zhenjiang Marine Auxiliary Machinery Co ltd
Priority date: 2021-12-13
Filing date: 2021-12-13
Publication date: 2022-02-15
Anticipated expiration: 2041-12-13
Also published as: CN114044093B

Abstract

The invention discloses a connecting rod type self-locking mechanism for a boat frame, wherein the boat frame is provided with a self-locking mechanism, the self-locking mechanism is connected with a shaft body arranged at the centers of two sides of a movable pulley, the self-locking mechanism comprises a connecting rod I, a connecting rod II and a connecting rod III, the connecting rod I and the connecting rod II are L-shaped, an arc-shaped notch is formed in the intersection of the long edge and the short edge of the connecting rod I, the middle part of the long edge of the connecting rod I is hinged to a boat frame at a point A, the top of the long edge of the connecting rod I is hinged to the top of the long edge of the connecting rod II at a point B, the long edge of the connecting rod II and the connecting rod III are both arc-shaped, the inner arc of the connecting rod II is attached to the outer arc of the connecting rod III, the short edge of the connecting rod II is hinged to a point C, the right end of the connecting rod II is hinged to a point D, the bottom of the long edge of the connecting rod II is provided with a threading eye plate, one end of a control rope is connected with a hanging ring on the boat frame, and the other end of the control rope passes through a pulley on a structure, And the threading eye plate and the pulley at the bottom of the keel block are finally connected with the remote control locking protection device.

Description

Connecting rod type self-locking mechanism for keel block

Technical Field

The invention relates to a connecting rod type self-locking mechanism for a boat davit.

Background

One of the boat davits is arranged as shown in the attached drawing I, is arranged on a cabin roof structure of a ship body and is used for collecting and releasing a lifeboat, is a main bearing device of the lifeboat and is also a storing and fixing device of the lifeboat.

A hoisting steel wire rope is wound on the boat frame, and one end of the hoisting steel wire rope is connected to a winding drum of the lifting winch through a guide pulley; the other end of the connecting rod is also connected to the tail end eye plate of the keel block through a guide pulley; and then the movable pulley is connected with a lifting ring and a lifeboat. When the winch drum rotates in a lifting mode, the movable pulley drives the lifeboat to lift, and finally the lifeboat reaches the highest position of the boat frame, namely the storage position of the lifeboat. However, if the state is maintained all the time, the hoisting steel wire rope of the davit is always in a stressed and tensioned state, which directly affects the service life of the hoisting steel wire rope.

In order to prolong the service life of the hoisting steel wire rope, a mechanism needs to be invented, and the mechanism is used for replacing the hoisting steel wire rope to bear the load of the lifeboat and reliably self-lock the lifeboat at the storage position of the lifeboat, so that the hoisting steel wire rope is unloaded. When an emergency occurs, the mechanism can be quickly opened, and the folding and unfolding of the lifeboat are not influenced.

Disclosure of Invention

The invention aims to solve the defects of the prior art and provides a connecting rod type self-locking mechanism for a keel block.

A connecting rod type self-locking mechanism for a keel block comprises the keel block, the keel block is fixed on a ship body structure, a tail end eye plate is arranged at the tail part of the keel block, one end of a hoisting steel wire rope is tied on the tail end eye plate, the other end of the hoisting steel wire rope passes through a corner pulley at the head part of the keel block and then bypasses a movable pulley below the corner pulley, and a fixed pulley behind the corner pulley is connected with a winding drum of a lifting winch, the structures at the left side and the right side of the keel block are symmetrical, a self-locking mechanism is arranged on the keel block and is connected with a shaft body arranged at the centers of the two sides of the movable pulley, the self-locking mechanism comprises a connecting rod I, a connecting rod II and a connecting rod III, the connecting rod I and the connecting rod II are L-shaped, an arc-shaped notch is arranged at the intersection of the long edge and the short edge of the connecting rod I, the middle part of the long edge of the connecting rod I is hinged with the keel block at a point A, and the top of the long edge of the connecting rod I is hinged with the top of the long edge of the connecting rod II at a point B, the long edge of connecting rod II and connecting rod III are arc, and the interior arc of connecting rod II is laminated with the outer arc of connecting rod III mutually, and the minor face of connecting rod II articulates in C point with the left end of connecting rod III, and the right-hand member of connecting rod III articulates in D point with the keel block, and the long edge bottom of connecting rod II is equipped with the threading eye plate, and the one end of control rope links to each other with the rings on the keel block, and the other end successively passes pulley, threading eye plate, the pulley of keel block bottom on the hull structure and links to each other with remote control locking protection device at last.

As a further improvement, the bottom of the movable pulley is provided with a hanging ring, and the hanging ring is connected with a lifeboat.

As a further improvement, the connection mode of the end eye plate and the boat davit is welded or connected through bolts.

As a further improvement, the hinged parts of the connecting rods are coated with lubricating grease.

As a further improvement, the connecting rods I, II and III are all made of stainless steel.

As a further improvement, the surfaces of the connecting rod I, the connecting rod II and the connecting rod III are coated with anti-rust primer.

Has the advantages that:

the novel connecting rod type self-locking mechanism is ingenious in design, the self structural form is ingeniously utilized, the load can be effectively borne and self-locking is formed in the storage state of the device, the hoisting steel wire rope is unloaded, and the mechanism cannot be opened by the self weight of the load no matter how the load changes. When the self-locking mechanism needs to be opened, the connecting rod II must be manually stirred to rotate clockwise by a certain angle. In addition, the whole rotating process of the self-locking mechanism cannot interfere with the movable pulley shaft, and the folding and unfolding of the lifeboat are not influenced.

Drawings

Fig. 1 is a schematic general structure diagram of a connecting rod type self-locking mechanism for a keel block;

FIG. 2 is a schematic diagram of a locking state of the link type self-locking mechanism;

FIG. 3 is a schematic diagram of a dead point state of the link type self-locking mechanism;

FIG. 4 is a schematic view of the open position of the link-type self-locking mechanism;

FIG. 5 is a schematic diagram of the formula;

1. the tail end eye plate 2, the hull structure 3, the keel block 4, the hoisting steel wire rope 5, the corner pulley 6, the self-locking mechanism 7, the movable pulley 8, the fixed pulley 9, the connecting rod I10, the connecting rod II 11, the connecting rod III 12, the movable pulley shaft body 13 and the limiting stop lever.

Detailed Description

For the purpose of enhancing the understanding of the present invention, the present invention will be further described in detail with reference to the following examples and the accompanying drawings, which are only used for explaining the present invention and are not to be construed as limiting the scope of the present invention.

As shown in fig. 1 to 5, a connecting rod type self-locking mechanism for a keel block comprises a terminal eye plate 1, a hull structure 2, a keel block 3, a hoisting steel wire rope 4, a corner pulley 5, a self-locking mechanism 6, a movable pulley 7, a fixed pulley 8, a connecting rod i 9, a connecting rod ii 10, a connecting rod iii 11, a movable pulley shaft body 12 and a limit stop lever 13.

The connecting rod type self-locking mechanisms are provided with two sets, are arranged on the left side and the right side of a davit suspension arm structure, are symmetrically arranged and mainly comprise a connecting rod I, a connecting rod II and a connecting rod III, and the three connecting rods are arranged in the same plane. Wherein the connecting rod I and the connecting rod II are hinged at a point B; the connecting rod II and the connecting rod III are hinged at the point C, and the inner arc of the connecting rod II can be attached to the outer arc of the connecting rod III; the connecting rod I is hinged with a shaft A fixed on the boat frame; the connecting rod III is hinged with a shaft D fixed on the boat davit.

And (3) stress analysis:

when load G hangs in the arc notch position of connecting rod I, self-locking mechanism's connecting rod I catches on the axis body both ends of movable pulley (being equivalent to and bears load), and connecting rod I receives G's perpendicular decurrent effort, and connecting rod I has and does clockwise rotation's trend around a round axle A, probably drives connecting rod II this moment and does clockwise or anticlockwise rotation around pin joint B.

If the connecting rod II rotates anticlockwise around the hinge point B, the connecting rod III also rotates anticlockwise around the shaft D due to the action of the connecting rod II. But because the inner circular arc of the connecting rod II is attached to the outer circular arc of the connecting rod III in design, the connecting rod II and the connecting rod III are in the same plane, and the connecting rod II and the connecting rod III cannot actually rotate anticlockwise, so that self-locking is formed. Therefore, the link II only has the possibility of rotating around the hinge point B clockwise, and drives the link III to rotate around the shaft D clockwise.

Analyzing the attached figure 2 again, the straight line connecting the two points BD is L-L, the straight line connecting the two points CD is M-M, and the included angle between the straight line L-L and the straight line M-M is alpha. Observation shows that the hinge point C of the connecting rod II and the connecting rod III is below the straight line L-L, and the connecting rod mechanism can be actually regarded as a quadrangle of A-B-C-D-A. Suppose that a person actively stirs the connecting rod II and drives the connecting rod III to rotate clockwise and slowly around the axis D (as force F in figure 2), when the point C falls on the straight line L-L (as shown in figure 3), the connecting rod mechanism can be regarded as a triangle of A-B-C-A, the triangle has stability (as shown in figure 5), the connecting rod mechanism is locked, and the connecting rod mechanism cannot rotate no matter how the value of G changes.

The connecting rod II is continuously and actively stirred and drives the connecting rod III to rotate clockwise slowly around the shaft D (as shown by a force F in the figure 4), and at the moment, the included angle between the straight line M-M and the straight line L-L is beta, so that the connecting rod I also rotates clockwise. In fact, as long as the included angle beta is larger than 0, the connecting rod I, the connecting rod II and the connecting rod III can be driven by the dead weight of G to rotate clockwise respectively until the connecting rod I rotates to touch the limiting stop lever. At the moment, the rotating angle of the connecting rod I is gamma, the angle gamma needs to completely satisfy the lowering of the movable pulley and the load, and the connecting rod I cannot interfere with the movable pulley shaft after the connecting rod I rotates by the angle gamma.

In conclusion, when the hinge point C is positioned below the straight line L-L, the connecting rod II and the connecting rod III in the connecting rod mechanism have the tendency of anticlockwise rotation, and the mechanism is self-locked.

When the hinge point C is on the straight line L-L, the link mechanism forms a triangle which is a dead point, and the mechanism is self-locked.

When the hinge point C is above the straight line L-L, the connecting rod II and the connecting rod III in the connecting rod mechanism have the tendency of clockwise rotation, and the mechanism is opened.

The hinge point C must cross an angle a from the storage position to the open position and cannot turn the mechanism by the weight of the load, regardless of the load change. When the self-locking mechanism is required to be opened, the eye plate of the connecting rod II can be pulled clockwise only through the remote control cable in the figure I.

In a storage state, in order to ensure that the connecting rod II of the self-locking mechanism cannot accidentally rotate clockwise due to factors such as vibration and the like, a remote control cable can be arranged to downwards tighten the self-locking mechanism to play a role in protection.

The above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the invention, and any modifications, equivalents, improvements and the like that fall within the spirit and principle of the present invention are intended to be included therein.

Claims

1. A connecting rod type self-locking mechanism for a keel block comprises the keel block, the keel block is fixed on a ship body structure, a tail end eye plate is arranged at the tail part of the keel block, one end of a hoisting steel wire rope is tied on the tail end eye plate, the other end of the hoisting steel wire rope passes through a corner pulley at the head part of the keel block and then bypasses a movable pulley below the corner pulley, and a fixed pulley behind the corner pulley is connected with a winding drum of a lifting winch, the structures at the left side and the right side of the keel block are symmetrical, the connecting rod type self-locking mechanism is characterized in that the keel block is provided with a self-locking mechanism, the self-locking mechanism is connected with a shaft body arranged at the centers of two sides of the movable pulley, the self-locking mechanism comprises a connecting rod I, a connecting rod II and a connecting rod III, the connecting rods I and II are L-shaped, an arc-shaped notch is arranged at the intersection of the long side and the short side of the connecting rod I, the middle part of the long side of the connecting rod I is hinged with the keel block at a point A, the top of the long side of the connecting rod I is hinged with the top of the long side of the connecting rod II at a point B, the long edge of connecting rod II and connecting rod III are arc, and the interior arc of connecting rod II is laminated with the outer arc of connecting rod III mutually, and the minor face of connecting rod II articulates in C point with the left end of connecting rod III, and the right-hand member of connecting rod III articulates in D point with the keel block, and the long edge bottom of connecting rod II is equipped with the threading eye plate, and the one end of control rope links to each other with the rings on the keel block, and the other end successively passes pulley, threading eye plate, the pulley of keel block bottom on the hull structure and links to each other with remote control locking protection device at last.

2. The connecting rod type self-locking mechanism for the keel boat according to claim 1, wherein a hanging ring is arranged at the bottom of the movable pulley, and the hanging ring is connected with a lifeboat.

3. The connecting rod type self-locking mechanism for the keel block according to claim 1, wherein the connecting mode of the end eye plate and the keel block is welding connection or bolt connection.

4. The connecting rod type self-locking mechanism for the keel boat according to claim 1, wherein the hinged parts of the connecting rods are coated with grease.

5. The connecting rod type self-locking mechanism for the keel boat according to claim 1, wherein the connecting rods I, II and III are made of stainless steel.

6. The connecting rod type self-locking mechanism for the keel boat according to claim 1, wherein the surfaces of the connecting rod I, the connecting rod II and the connecting rod III are coated with anti-rust primer.