A quick-detachable soft-rigid arm nose cone for a single-point mooring system

Abstract

A single-point mooring system soft arm nose cone that can be quickly separated, the soft wall end is connected to the pin shaft through a locking member, the top of the locking member is connected to the pin shaft through a slewing bearing, and the bottom of the locking member is connected to the soft wall end through an explosive bolt. The locking member has a cylindrical shell with a hollow interior, a circular sleeve is fixed inside the shell, a spring is placed inside the sleeve, and the bottom of the sleeve has a locking end boss, which is matched and connected with the boss of the soft arm end. An annular docking ring is connected to the inner side of the bottom of the shell through bolts, and the docking ring and the locking end boss form a plurality of slide grooves, and a docking block is arranged in the slide groove, and the docking block can move up and down in the slide groove. In the emergency separation working condition, the separation operation of the present invention does not damage the main structure of the soft arm, improves the reusability of the device, and saves expenses. In addition, the soft arm end after emergency separation can float on the sea, avoiding damage to the submarine pipeline and submarine cable caused by the soft arm end when the offshore floating device is towed.

Description

Technical Field

[0001] The invention relates to the field of single point mooring systems, in particular to a soft rigid arm nose cone capable of quickly separating the single point mooring system. Background Art

[0002] The conventional release and separation point of the soft rigid arm of the single-point mooring system is located at the connection between the lower hinge joint of the mooring leg and the lower end of the mooring leg. At present, the connection methods of the separation point of the single-point mooring system in the Bohai Sea area are: flange bolt connection, clamping connection, and pin connection. The mooring leg is separated from the lower hinge joint by removing the connecting parts at the connection, and the soft rigid arm is lowered to the sea surface through the bow rope winch to float freely, so as to achieve complete release and separation of the hull and the soft rigid arm.

[0003] Conventional release schemes are release methods designed by manufacturers under normal working conditions. However, under long-term severe sea conditions, the soft rigid arm or other load-bearing components or parts will be seriously damaged, and the conventional release scheme cannot be implemented at this time. To achieve release, it often takes 6 to 8 hours to use a heavy-duty jack to push out the pin shaft at the head of the soft rigid arm nose cone, or to perform emergency destructive cutting of the pipe section at the nose cone to achieve separation. The former separation operation takes a long time, and the latter destructively separated soft rigid arm nose end will be lowered to the seabed, which may cause damage to submarine pipelines and cables when the ship is towing at sea. Summary of the invention

[0004] In order to solve the above problems, the present invention provides a single point mooring system soft rigid arm nose cone which can be quickly separated, aiming to achieve the purpose of separating the docking body within seconds under emergency conditions, and the separated soft rigid arm will not cause damage to the submarine pipeline and submarine cable. The technical solution adopted is:

[0005] A single-point mooring system soft arm nose cone that can be quickly separated, the soft wall end is connected to the pin shaft through a locking member, the top of the locking member is connected to the pin shaft through a slewing bearing, and the bottom of the locking member is connected to the soft wall end through an explosive bolt.

[0006] The locking member has a cylindrical shell with a hollow interior and an opening at the bottom of the shell. A circular sleeve is fixed inside the shell and in the center. The sleeve is divided into an upper sleeve and a lower sleeve sleeve. The upper sleeve and the lower sleeve are slidably connected. The top of the upper sleeve is fixed on the top wall of the shell. The locking end boss at the bottom of the lower sleeve extends from the bottom of the shell. A spring is placed inside the sleeve. There is a spacing between the sleeve and the shell. An annular docking ring is connected to the inner side of the bottom of the shell by bolts. The docking ring and the locking end boss form multiple sliding grooves. The multiple sliding grooves are arranged circumferentially and at equal intervals along the docking ring. A docking block is arranged in the slide groove, and the docking block can move up and down in the slide groove.

[0007] The locking end boss has a downward protrusion, and a soft steel arm end boss is arranged on the top of the soft steel wall end. The soft steel arm end boss has a first groove, and the protrusion is inserted into the first groove. The first groove is adapted to the protrusion, and a second groove is circumferentially arranged on the top of the soft steel arm end. After the soft steel arm end is docked with the locking member, the downward protrusion and the docking ring and docking block of the first groove locking member are located in the second groove.

[0008] The above-mentioned soft rigid arm nose cone of the single-point mooring system that can be quickly separated, further, has a plurality of first explosion screw holes arranged at equal intervals along the circumference of the shell on the outer side of the bottom of the shell, and second explosion screw holes corresponding to the first explosion screw holes are arranged on the outer side of the top of the soft rigid wall end and along the circumference of the soft rigid wall end, and the explosive bolts pass through the first explosion screw holes and the second explosion screw holes to connect the soft rigid wall end with the locking component.

[0009] The above-mentioned single-point mooring system soft arm nose cone that can be quickly separated further has a first inward stopper at the bottom of the upper sleeve and a second outward stopper at the top of the lower sleeve, and the second stopper is overlapped on the first stopper.

[0010] The above-mentioned single-point mooring system soft steel arm nose cone that can be quickly separated further has a buckle at the bottom of the docking block that matches the soft steel wall end boss.

[0011] The above-mentioned soft rigid arm nose cone of the single point mooring system that can be quickly separated, further, the protrusion w is circular and is arranged along the circumference of the locking end boss.

[0012] The above-mentioned soft rigid arm nose cone of the quickly detachable single-point mooring system, further, has the first groove in a circular shape and arranged circumferentially along the boss at the end of the soft rigid wall.

[0013] The above-mentioned soft rigid arm nose cone of the quickly detachable single-point mooring system, further, has the second groove in a circular shape and arranged circumferentially along the soft rigid wall end.

[0014] The beneficial effects of the present invention are:

[0015] 1. This connection device uses springs and mechanical coordination to complete the docking and separation of the soft steel arm nose cone. It is not only easy and quick to operate, but also has high system stability and fast completion of the action.

[0016] 2. Traditional control systems mostly use hydraulic control, but the hydraulic system is prone to failure in harsh environments, and regular maintenance of hydraulic pumps, hydraulic seals, control stations, hydraulic pipelines and other equipment and components is required. This connection device is easy to maintain and can save a lot of manpower and material resources in later maintenance.

[0017] 3. This connection device can not only be separated in the conventional soft steel arm nose cone separation method, that is, using a heavy-duty jack to push out the soft steel arm nose cone pin, but also can cope with separation under emergency conditions. By controlling the explosive action of the explosive bolt, the connection device can achieve the separation of the docking body in seconds with the cooperation of the tension spring.

[0018] 4. In the case of emergency separation, the separation operation of this connection device does not damage the main structure of the soft rigid arm, which improves the reusability of the device and saves costs. In addition, the soft rigid arm end after emergency separation can float on the sea, avoiding damage to the submarine pipeline and submarine cable caused by the soft rigid arm end when the offshore floating device is towed. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 It is a schematic diagram of the locking member connection structure of the present invention;

[0020] Figure 2 It is a schematic diagram of the soft rigid arm end structure of the present invention;

[0021] Figure 3 It is a schematic diagram of the overall structure of the present invention;

[0022] Figure 4 is a schematic diagram of a bottom view after the locking member is separated;

[0023] Among them: 1-pin shaft, 2-slewing bearing, 3-explosive bolt, 4-housing, 5-upper sleeve, 6-lower sleeve, 7-locking end boss, 8-spring, 9-docking ring, 10-docking block, 11-soft arm end boss, 12-first groove, 13-second groove, 14-buckle, 15-bolt. DETAILED DESCRIPTION

[0024] The present invention will be further described in conjunction with the accompanying drawings.

[0025] Example 1

[0026] A single-point mooring system flexible arm nose cone that can be quickly separated, the flexible arm end is connected to the pin through a locking member, the top of the locking member is connected to the pin through a slewing bearing, the bottom of the locking member is connected to the flexible arm end boss through a buckle and a locking end boss, and the flexible arm end boss is fixed to the top of the flexible arm end. Figure 1As shown, the locking member has a cylindrical shell, the top of the shell is fixedly connected to the slewing bearing, the top of the shell is sealed, and the bottom is open. A sleeve is arranged in the center of the shell, and the sleeve is composed of an upper sleeve and a lower sleeve. The upper sleeve is slidably connected to the lower sleeve. The inner side of the bottom of the upper sleeve is provided with a first stopper, and the outer side of the top of the lower sleeve is provided with a second stopper. The second stopper overlaps the first stopper, and the second stopper can slide up and down along the inner wall of the upper sleeve. A spring is arranged inside the sleeve. When the soft rigid arm end is connected to the locking member, the lower sleeve will be subjected to an upward force, and the lower sleeve will be squeezed upward, and then the internal spring will be squeezed and contracted, and the contracted spring is always ready for separation.

[0027] The top of the upper sleeve is fixed on the top wall of the shell, and the locking end boss at the bottom of the lower sleeve extends out of the bottom of the shell. The locking end boss has a downward protrusion, and the soft arm end boss is provided with a downward first groove (such as Figure 2 As shown), the protrusion is matched with the first groove, as shown Figure 3 As shown, after the soft steel arm end is butted with the locking member, the protrusion is inserted into the first groove, and the protrusion fits the first groove perfectly. The protrusion is arranged along the circumference of the locking end boss, and the first groove is arranged along the circumference of the soft steel arm end boss.

[0028] The bottom of the shell is connected with an annular docking ring by bolts, and the annular docking ring and the locking end boss form multiple slide grooves, which are arranged at equal intervals along the circumference of the docking ring. A docking block is slidably connected in the slide groove, and the docking block can slide up and down in the slide groove. When the soft steel arm end is docked with the locking member, the docking block is squeezed and slides upward. At the same time, the buckle at the bottom of the docking block buckles the soft steel arm end boss. The multiple docking blocks are in a circular ring shape as a whole, and they tightly grasp the soft steel arm end boss like a claw to connect the soft steel arm end with the locking member.

[0029] A second groove is arranged on the outer circumference of the soft steel arm end. After the soft steel arm end and the locking member are butted, the bottom of the butt joint ring and the butt joint block are located in the second groove. Figure 2 , 3 As shown, a plurality of first explosive screw holes are arranged at equal intervals at the bottom of the locking member shell and along the circumference of the shell, and a plurality of second explosive screw holes are arranged at equal intervals at the outer circumference of the top of the soft rigid arm end. After the soft rigid arm end is connected to the locking member, the positions of the first explosive screw hole and the second explosive screw hole correspond to each other, and the explosive bolt passes through the first explosive screw hole and the second explosive screw hole to connect the soft rigid arm end to the locking member.

[0030] The explosive bolts are controlled by the central control room, which sends an explosion signal to the explosive bolts. The connected docking ring applies radial and axial pressure to the docking block to achieve mechanical locking, and the spring is in a compressed state. The docked soft steel arm nose cone can be installed in the conventional offshore installation method, and the soft steel arm nose cone pin is installed in the soft steel arm bracket of the mooring tower to achieve the pitch of the hull, and the slewing bearing in the soft steel arm nose cone realizes the roll of the hull.

[0031] When emergency separation is required, the central control room controls the explosion of the explosive bolt. The soft steel arm end is driven by gravity to move the docking ring and the locking end boss downward. At the same time, the compression spring releases elastic potential energy and pushes the locking end boss out of the sleeve. The bosses at both ends drive the docking block to tighten the head in the docking ring groove and open the tail end. When the first stopper of the upper sleeve overlaps the second stopper of the lower sleeve, the locking end and the soft steel arm end are completely separated, and the spring returns to a free state.

[0032] The device can also perform conventional soft rigid arm nose cone separation operations, that is, use a heavy-duty jack to push the soft rigid arm nose cone head pin out of the mooring tower soft rigid arm bracket.

[0033] The present invention utilizes springs and mechanical coordination to complete the docking and separation of the soft rigid arm nose cone. Not only is the operation convenient and quick, but the system also has high stability and can complete the action quickly. The later maintenance is simple, which can save a lot of manpower and material resources. Not only can it be separated in the conventional soft rigid arm nose cone separation method, that is, the soft rigid arm nose cone pin is ejected using a heavy-duty jack. It can also cope with separation under emergency conditions. By controlling the explosive action of the explosive bolt, the connecting device can achieve the separation of the docking body in seconds with the cooperation of the tension spring. Under emergency separation conditions, the separation operation of the present invention does not damage the main structure of the soft rigid arm (such as Figure 4 The flexible arm end after emergency separation can float on the sea, thus avoiding damage to the submarine pipeline and submarine cable caused by the flexible arm end when the offshore floating device is towed.

Claims

1. A quick-detachable single-point mooring system soft arm nose cone, characterized by: The end of the soft rigid wall is connected to the pin shaft (1) through a locking member, the top of the locking member is connected to the pin shaft through a slewing bearing (2), and the bottom of the locking member is connected to the end of the soft rigid wall through an explosive bolt (3); The locking member has a cylindrical shell (4) with a hollow interior, the bottom of the shell is open, a circular sleeve is fixed inside the shell and at the center, the sleeve is divided into an upper sleeve (5) and a lower sleeve (6), the upper sleeve is slidably connected to the lower sleeve, the top of the upper sleeve is fixed on the top wall of the shell, the locking end boss (7) at the bottom of the lower sleeve extends from the bottom of the shell, a spring (8) is placed inside the sleeve, there is a distance between the sleeve and the shell, an annular docking ring (9) is connected to the inner side of the bottom of the shell by bolts (15), the docking ring and the locking end boss form a plurality of slide grooves, the plurality of slide grooves are arranged along the circumference of the docking ring and at equal intervals, a docking block (10) is arranged in the slide groove, and the docking block can move up and down in the slide groove; The locking end boss has a downward protrusion, the top of the soft steel wall end is provided with a soft steel arm end boss (11), the soft steel arm end boss has a first groove (12), the first groove is adapted to the protrusion, and a second groove (13) is circumferentially provided on the top of the soft steel arm end. After the soft steel arm end is docked with the locking member, the protrusion is inserted into the first groove, and the docking ring and docking block of the locking member are located in the second groove; The first groove is circular and arranged along the circumference of the boss at the end of the soft rigid wall, and the second groove is circular and arranged along the circumference of the end of the soft rigid wall.

2. The quick-detachable single point mooring system soft arm nose cone according to claim 1, characterized in that: A plurality of first explosion screw holes are arranged at equal intervals along the circumference of the shell on the outer side of the bottom of the shell, and second explosion screw holes corresponding to the first explosion screw holes are arranged on the outer side of the top of the soft rigid wall end and along the circumference of the soft rigid wall end. The explosion bolts pass through the first explosion screw holes and the second explosion screw holes to connect the soft rigid wall end with the locking component.

3. The quick-detachable single point mooring system soft arm nose cone according to claim 1, characterized in that: The bottom of the upper sleeve is provided with a first stopper facing inwards, and the top of the lower sleeve is provided with a second stopper facing outwards, and the second stopper is overlapped on the first stopper.

4. The quick-detachable single point mooring system soft arm nose cone according to claim 1, characterized in that: The bottom of the docking block is provided with a buckle (14) which matches with the boss at the end of the soft rigid wall.

5. The quick-detachable single point mooring system soft arm nose cone according to claim 1, characterized in that: The protrusion is circular and is arranged along the circumference of the locking end boss.

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