Guide chain device applied to temporary anchoring

Abstract

A guide chain device applied to temporary anchoring is characterized in that a front guide chain device, a rear guide chain device and a chain stopper are sequentially arranged on a broadside deck from outside to inside, the front guide chain device is provided with two vertically-arranged front stand columns, an anti-abrasion pipe and a front jacking pipe are sequentially fixed between the two front stand columns from bottom to top, and the distance a between the two front stand columns is 1.2 M; the distance b between the anti-abrasion pipe and the front jacking pipe is 1.2 M; the rear chain guide comprises two rear stand columns which are vertically arranged, and a rear jacking pipe is fixed between the two rear stand columns; an anchor frame is fixed on the ship body outer plate below the front chain guide, and an anchor chain bypasses the chain stopper, sequentially passes through the rear chain guide and the front chain guide, is downwards and is fixedly connected with an anchor. According to the anchor chain guiding device, guiding operation of the anchor chain can be achieved, the anchor chain in any direction from the anchor frame end enters the chain guiding device, and after being guided by the chain guiding device, the anchor chain smoothly enters the chain stopper without the blocking phenomenon. The device has the advantages of safety, reliability, simplicity in manufacturing and easiness in maintenance.

Description

Technical Field

[0001] This invention belongs to the field of marine vessel design and construction, and specifically relates to a chain guide device for temporary anchoring. Background Technology

[0002] For engineering vessels or special-purpose vessels, due to their unique hull shape or limited bow space, anchor frames are often used instead of anchor platforms or anchor holes in temporary mooring systems. During the journey of the anchor chain from the anchor frame to the chain stopper, a chain guide device is required to allow the anchor chain to be extended and retracted in a specific direction, smoothly entering the chain stopper for locking.

[0003] The current standard practice is to use cable guides as chain guiding devices, but since cable guides are designed for cables or wire ropes, using them for anchor chain guidance presents the following problems:

[0004] 1. If the size of the chain inlet of the cable guide is selected based on the chain stopper, the anchor chain may get stuck in the cable guide opening if the angle at which the anchor chain enters the cable guide is too large.

[0005] 2. If the guide wire inlet size is selected based on the anchor chain link length, the anchor chain can pass through the guide wire smoothly. However, because this size is relatively large compared to the chain stopper inlet size, there are cases where the anchor chain cannot enter the chain stopper. Summary of the Invention

[0006] To address the above problems, this invention provides a chain guide device for temporary mooring, the technical solution of which is as follows:

[0007] A chain guide device for temporary anchoring comprises, on the side deck, a forward chain guide, a rear chain guide, and a chain stop, arranged sequentially from the outside in. The forward chain guide has two vertically arranged forward posts, with an abrasion-resistant tube and a forward jacking tube fixed between them from bottom to top. The distance between the two forward posts is a = 1.2M, and the distance between the abrasion-resistant tube and the forward jacking tube is b = 1.2M. The rear chain guide includes two vertically arranged rear posts, with a rear jacking tube fixed between them. Where M is the length of the anchor chain link.

[0008] An anchor frame is fixed to the hull plating below the leading chain guide. The anchor chain passes around the chain stopper, passes through the aft chain guide and the leading chain guide in sequence, and is fixedly connected to the anchor.

[0009] Furthermore, in the aforementioned chain guide device for temporary anchoring, the leading chain is located at the side edge, and the forward column is partially located on the deck and partially extends downward to the surface of the hull plating.

[0010] Furthermore, in the aforementioned chain guide device for temporary anchoring, the center distance between the front and rear posts is e=2M.

[0011] Furthermore, in the aforementioned chain guide device used for temporary anchoring, the angle α between the line connecting the center of the aft jacking pipe and the center of the forward jacking pipe and the horizontal line is not less than the angle of inclination of the anchor chain on the deck.

[0012] Furthermore, the aforementioned chain guide device for temporary anchoring is further equipped with sealing plates at both the upper and lower ends of the front and rear columns.

[0013] Furthermore, in the aforementioned chain guide device used for temporary anchoring, the inclination angle of the anchor chain on the deck is 12° to 18°.

[0014] This invention provides a temporary anchoring chain guide device that guides the anchor chain, allowing it to enter from any direction at the anchor frame end. After being guided by the chain guide, the chain smoothly enters the chain stopper without any jamming. It offers advantages such as safety, reliability, simple manufacturing, and ease of maintenance. Attached Figure Description

[0015] Figure 1 This is a top view of the structure of the present invention;

[0016] Figure 2 This is a side view of the structure of the present invention;

[0017] Figure 3 This is a schematic diagram of the leader chain structure;

[0018] Figure 4 This is a schematic diagram of the rear lead chain structure;

[0019] Figure 5 This is a side view of the front and rear chain guides.

[0020] Wherein: 1-front guide chain, 1-1-front column, 1-2-abrasion-resistant pipe, 1-3-front jacking pipe, 1-4-sealing plate, 2-rear guide chain, 2-1-rear column, 2-2-rear jacking pipe, A-anchor frame, B-anchor, C-anchor chain, D-chain stopper, E-deck, M-anchor chain link length, N-anchor chain link width, N-anchor chain link width, a-horizontal spacing between front columns, b-vertical spacing between front jacking pipe and abrasion-resistant plate, c-outer diameter of pipe, d-nominal diameter of anchor chain, e-center distance between front and rear columns, f-horizontal distance between rear columns. Detailed Implementation

[0021] The invention will be further described with reference to the accompanying drawings.

[0022] A chain guide device for temporary mooring, comprising a front chain guide and a rear chain guide, such as... Figure 3 , 4 As shown, the front guide chain assembly includes a front column, a wear-resistant tube, a front jacking tube, and a sealing plate, while the rear guide chain assembly includes a rear column, a rear jacking tube, and a sealing plate.

[0023] In the guide chain assembly, the front upright, wear-resistant tube, and front jacking tube are all made of tubular material with an outer diameter c=3.5d. An excessively large c value results in material waste and increases the equipment's weight; an excessively small c value causes the anchor chain to jam during passage. The wall thickness of the front upright is calculated using finite element analysis based on the minimum breaking force of the anchor chain. The wall thickness of the wear-resistant tube and the front jacking tube is 0.5d, which includes a wear allowance. The horizontal spacing 'a' between the front uprights and the vertical spacing 'b' between the front jacking tube and the wear-resistant plate are both 1.2 times the anchor chain link length M. This spacing allows anchor chains from any direction to smoothly enter the guide chain assembly. If 'a' and 'b' are too large, they will not effectively constrain the anchor chain's direction; if 'a' and 'b' are too small, the anchor chain is prone to jamming at the guide chain assembly. A sealing plate is installed at the end of the front upright to prevent internal corrosion.

[0024] The center distance e = 2M between the front post in the front guide and the rear post in the rear guide. This distance ensures that the anchor chain remains parallel to the center lines of the front and rear posts between the front and rear guides, maintaining a consistent attitude as the anchor chain passes through them. Figure 5 As shown, the forward pillar is located on the side deck and extends downwards to the surface of the hull plating.

[0025] In the aft chain guide, both the aft mast and the aft jacking pipe are made of tubular material with an outer diameter c = 3.5d. The wall thickness of the aft mast is calculated using finite element analysis based on the minimum breaking force of the anchor chain. The wall thickness of the aft jacking pipe is 0.5d. The aft mast spacing f is the same as the width at the anchor chain inlet of the chain stopper, ensuring that the anchor chain can smoothly enter the chain stopper after exiting the aft chain guide. The angle α between the line connecting the center of the aft jacking pipe and the center of the forward jacking pipe and the horizontal line is not less than the inclination angle of the anchor chain on the deck, typically between 12° and 18°. A sealing plate is installed at the end of the aft mast to seal and prevent corrosion inside the forward mast.

[0026] When the anchor is lifted from the seabed, its position is random, therefore the anchor chain also enters the chain guide device at any angle, such as... Figure 1 , 2 As shown.

[0027] The anchor chain enters the front guide chain and passes between the front top tube and the anti-wear tube. Its position is restricted between the front columns. Through the front guide chain, the anchor chain can smoothly enter the rear guide chain.

[0028] In the rear guide chain device, the distance f between the rear uprights is the same as the width at the anchor chain entrance of the chain stopper. After the anchor chain comes out of the rear guide chain device, it smoothly enters the chain stopper.

[0029] Thus, the chain guiding device of the present invention, applied to temporary anchoring, has completed its chain guiding operation. After the operation is completed, the chain guiding device and related equipment of the present invention are...

Claims

1. A chain guide device for temporary mooring, characterized in that, On the side deck, from the outside in, there are a forward chain guide, a rear chain guide, and a chain stopper. The forward chain guide has two vertically arranged forward columns, and between the two forward columns, from bottom to top, are abrasion-resistant tubes and a forward jacking tube. The distance between the two forward columns is a = 1.2M, and the distance between the abrasion-resistant tube and the forward jacking tube is b = 1.2M. The rear chain guide includes two vertically arranged rear columns, and between the two rear columns is a rear jacking tube. An anchor frame is fixed to the hull plating below the leading chain guide. The anchor chain passes around the chain stopper, passes through the aft chain guide and the leading chain guide in sequence, and is fixedly connected to the anchor.

2. The chain guide device for temporary mooring according to claim 1, characterized in that, The leading chain is located on the side edge, and the forward pillar is partially located on the deck and partially extends downwards to the surface of the hull plating.

3. The chain guide device for temporary mooring according to claim 1, characterized in that, The center distance between the front and rear columns is e = 2M.

4. A chain guide device for temporary mooring according to claim 1, characterized in that, The angle α between the line connecting the center of the rear jacking pipe and the center of the front jacking pipe and the horizontal line shall not be less than the angle of inclination of the anchor chain on the deck.

5. A chain guide device for temporary mooring according to claim 1, characterized in that, Both the top and bottom ends of the front and rear columns are equipped with sealing plates.

6. A chain guide device for temporary mooring according to claim 1, characterized in that, The anchor chain is tilted at an angle of 12° to 18° on the deck.

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