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] The invention belongs to the field of marine ship design and construction, and in particular relates to a chain guide device used for temporary anchoring. Background Art

[0002] For engineering vessels or special ships, due to the special characteristics of their lines or the limitation of bow space, anchor frames are often used instead of anchor platforms or anchor holes in temporary mooring systems. In the process of the anchor chain passing through the anchor frame to the chain stopper, a chain guide device needs to be set so that the anchor chain can be retracted and released in a certain direction to smoothly enter the chain stopper, so that the anchor chain can be locked with the chain stopper.

[0003] At present, the conventional practice is to use a fairlead as a chain guide device. However, since the fairlead is designed for cables or wire ropes, there are the following problems when used for anchor chain guidance: 1. If the size of the fairlead inlet is selected according to the chain stopper, when the angle of the anchor chain entering the fairlead is too large, the anchor chain may get stuck at the fairlead outlet; 2. If the size of the fairlead inlet is selected according to the length of the anchor chain link, the anchor chain can pass through the fairlead smoothly. However, since this size is larger than the size of the chain stopper inlet, there is a situation where the anchor chain cannot enter the chain stopper. Summary of the invention

[0004] In order to solve the above problems, the present invention provides a chain guide device for temporary anchoring, and the technical solution adopted is: A chain guide device used for temporary anchoring, on the side deck, a front chain guide, a rear chain guide, and a chain stopper are arranged from outside to inside in sequence, the front chain guide has two vertically arranged front columns, and an anti-wear pipe and a front top pipe are fixed between the two front columns from bottom to top in sequence, the spacing between the two front columns is a=1.2M, and the spacing between the anti-wear pipe and the front top pipe is b=1.2M; the rear chain guide includes two vertically arranged rear columns, and a rear top pipe is fixed between the two rear columns. Wherein, M is the chain link length of the anchor chain.

[0005] An anchor frame is fixed on the hull outer plate below the front chain guide. The anchor chain passes around the chain stopper, passes through the rear chain guide and the front chain guide in sequence, and then goes down to be fixedly connected with the anchor.

[0006] The above-mentioned chain guide device used for temporary anchoring further has the front guide chain located at the side edge, the front column is partially located on the deck, and partially extends downward and is located on the outer plate surface of the hull.

[0007] The above-mentioned chain guide device applied to temporary anchoring, further, has a center distance e=2M between the front column and the rear column.

[0008] The above-mentioned chain guide device for temporary anchoring, further, the angle α between the line connecting the center of the rear top pipe and the center of the front top pipe and the horizontal line is not less than the inclination angle of the anchor chain on the deck The above-mentioned chain guide device for temporary anchoring further has blocking plates disposed at both upper and lower ends of the front column and the rear column.

[0009] The above-mentioned chain guide device for temporary anchoring, further, the inclination angle of the anchor chain on the deck is 12° to 18° The chain guide device for temporary anchoring of the present invention can realize the guiding operation of the anchor chain, so that the anchor chain from any direction of the anchor frame end enters the chain guide device, and after being guided by the chain guide device, smoothly enters the chain stopper without any jamming. It has the advantages of safety, reliability, simple manufacture and easy maintenance. BRIEF DESCRIPTION OF THE DRAWINGS

[0010] Figure 1 It is a schematic diagram of the top view of the structure of the present invention; Figure 2 It is a side structural schematic diagram of the present invention; Figure 3 It is a schematic diagram of the front chain guide structure; Figure 4 It is a schematic diagram of the rear guide chain structure; Figure 5 is a schematic diagram of the side structure of the front chain guide and the rear chain guide; Among them: 1-front chain guide, 1-1-front column, 1-2-anti-wear pipe, 1-3-front top pipe, 1-4-blocking plate, 2-rear chain guide, 2-1-rear column, 2-2-rear top 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 distance between front columns, b-vertical distance between front top pipe and anti-wear plate, c-outer diameter of pipe, d-nominal diameter of anchor chain, e-center distance between front column and rear column, f-horizontal distance between rear columns. DETAILED DESCRIPTION

[0011] The present invention will be further described in conjunction with the accompanying drawings.

[0012] A chain guide device used for temporary anchoring, consisting of a front chain guide and a rear chain guide, such as Figure 3 , 4 As shown, the front chain guide includes a front column, an anti-wear tube, a front top tube and a blocking plate, and the rear chain guide includes a rear column, a rear top tube and a blocking plate.

[0013] In the front chain guide, the front column, anti-wear pipe and front top pipe are all pipes with an outer diameter of c=3.5d. If the c value is too large, it will cause material waste and increase the deadweight of the equipment; if the c value is too small, the anchor chain will get stuck when passing through. The wall thickness of the front column is calculated by finite element method based on the minimum breaking force of the anchor chain. The wall thickness of the anti-wear pipe and the front top pipe is 0.5d, which includes the wear allowance. The horizontal spacing a between the front columns and the vertical spacing b between the front top pipe and the anti-wear plate are both 1.2 times the length M of the anchor chain link. This spacing allows the anchor chain from any direction to enter the chain guide device smoothly. If a and b are too large, they will not play a role in restricting the direction of the anchor chain; if a and b are too small, the anchor chain is easily stuck at the front chain guide. The blocking plate is installed at the end of the front column to play a blocking role to prevent corrosion inside the front column.

[0014] The center distance between the front column in the front chain guide and the rear column in the rear chain guide is e=2M. This distance can make the anchor chain always parallel to the center line of the front column and the rear column between the front and rear fairleads, so that the anchor chain has the same posture when passing through the front and rear columns. Figure 5 As shown, the front column is partially located on the side deck and partially extends downward to the surface of the hull outer plating.

[0015] In the rear chain guide, the rear column and the rear top tube are both pipes with an outer diameter of c=3.5d. The wall thickness of the rear column is calculated by finite element analysis based on the minimum breaking force of the anchor chain. The wall thickness of the rear top tube is 0.5d. The spacing f between the rear columns is the same as the width of the anchor chain entrance of the chain stopper, ensuring that the anchor chain can smoothly enter the chain stopper after coming out of the rear chain guide. The angle α between the line connecting the center of the rear top tube and the center of the front top tube and the horizontal line is not less than the inclination angle of the anchor chain on the deck, which is usually 12° to 18°. The plugging plate is installed at the end of the rear column to play a plugging role to prevent internal corrosion of the front column.

[0016] When the anchor is lifted from the seabed, its position is random, so the anchor chain also enters the chain guide at any angle, such as Figure 1 , 2 shown.

[0017] The anchor chain enters the front chain guide, passes between the front top tube and the anti-wear tube, and is limited in position between the front uprights. Through the front chain guide, the anchor chain can smoothly enter the rear chain guide.

[0018] In the rear chain guide, the distance f between the rear uprights is the same as the width of the anchor chain entrance of the chain stopper. After the anchor chain comes out of the rear chain guide, it smoothly enters the chain stopper.

[0019] So far, the chain guiding device for temporary anchoring of the present invention has completed the chain guiding operation. After the operation process is completed, the chain guiding device of the present invention and related equipment.

Claims

1. A chain guide device used for temporary anchoring, characterized in that: On the side deck, a front chain guide, a rear chain guide, and a chain stopper are arranged from outside to inside. The front chain guide has two vertically arranged front columns, and an anti-wear pipe and a front top pipe are fixed between the two front columns from bottom to top. The distance between the two front columns is a=1.2M, and the distance between the anti-wear pipe and the front top pipe is b=1.2M; the rear chain guide includes two vertically arranged rear columns, and a rear top pipe is fixed between the two rear columns; An anchor frame is fixed on the hull outer plate below the front chain guide. The anchor chain passes around the chain stopper, passes through the rear chain guide and the front chain guide in sequence, and then goes down to be fixedly connected with the anchor.

2. A chain guide device for temporary anchoring according to claim 1, characterized in that: The leading chain is located at the side edge, and the front upright is partly on the deck and partly extends downward and is located on the surface of the hull outer plating.

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

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

5. The chain guide device for temporary anchoring according to claim 1, characterized in that: The upper and lower ends of the front column and the rear column are both provided with blocking plates.

6. The chain guide device for temporary anchoring according to claim 1, characterized in that: The anchor chain is angled on the deck at 12° to 18°.

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