Semi-submersible drilling vessel for harsh environments

Abstract

The application discloses a semi-submersible drilling ship for severe environment, and relates to the technical field of semi-submersible drilling ships for severe environment.The semi-submersible drilling ship for severe environment comprises a ship body, a supporting column is fixed to the top of the ship body, a supporting plate is fixed to the top of the supporting column, a fixing plate is fixed to the top of the supporting plate, a motor is fixed to the side wall of the fixing plate, a rotating rod is fixed to the output end of the motor, a winding roller is fixed to the outer wall of the rotating rod, a steel rope is wound around the outer wall of the winding roller, and one end of the steel rope is fixed to the outer wall of the winding roller.The semi-submersible drilling ship for severe environment can make the water suction pipe suck seawater into the water tank by starting the water pump when encountering severe weather such as strong wind, so that the overall gravity of the ship body can be increased, the stability of the ship body can be improved, and the problem that the ship body shakes violently when the wind force on the seawater is too large can be solved.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of semi-submersible drilling ships in harsh environments, in particular to a semi-submersible drilling ship for use in harsh environments. BACKGROUND

[0002] The semi-submersible drilling ship is a floating ship type drilling platform, which is usually modified from a motor ship or a barge, and is used for oil and gas exploration and drilling operations in deep sea areas. Its design combines the advantages of bottom sitting platforms and drilling ships, and takes into account stability and deep water operation capability, and is one of the important equipment for modern offshore oil and gas development.

[0003] The existing semi-submersible drilling ship may cause the ship body to shake seriously when working in the ocean, thereby bringing safety risks to the workers, because the wind and waves on the ocean are generally large. SUMMARY

[0004] In view of the deficiencies of the prior art, the present application provides a semi-submersible drilling ship for use in harsh environments, which solves the problems raised in the background art.

[0005] To achieve the above purpose, the present application realizes the following technical scheme: a semi-submersible drilling ship for use in harsh environments, comprising a ship body, a support column fixed to the top of the ship body, a support plate fixed to the top of the support column, a fixed plate fixed to the top of the support plate, a motor fixed to the side wall of the fixed plate, a rotating rod fixed to the output end of the motor, a winding roller fixed to the outer wall of the rotating rod, a steel rope wound around the outer wall of the winding roller, one end of the steel rope fixed to the outer wall of the winding roller, the other end of the steel rope fixed to a mounting plate, a drilling equipment fixedly installed on the mounting plate, a stabilizing device arranged at the bottom of the support plate to improve the stability of the ship body, and a compression device arranged on the stabilizing device to prevent the steel rope from shaking.

[0006] The stabilizing device comprises a control panel, a water tank, a water pump, a water suction pipe, a drain pipe, a piston plate, a connecting rod, a connecting spring, an inclined block, an L-shaped block and a pressure sensor; the control panel is fixed to the side wall of the support column, the water tank is fixed to the bottom of the support plate, the water pump is fixed to the side wall of the water tank, the water pump is electrically connected with the control panel, the side wall output end of the water pump is communicated with the inside of the water tank, and the water suction pipe is fixed to the input end of the water pump.

[0007] According to the technical scheme, the piston plate is slidably installed on the inner wall of the water tank, the L-shaped block is fixed on the side wall of the piston plate, the connecting rod penetrates through the top of the water tank and the supporting plate and is slidably connected at the penetrating position, the bottom of the connecting spring is fixed on the top of the supporting plate, the top of the connecting spring is fixed on the top protrusion of the connecting rod, and the inclined surface block is fixed on the bottom of the connecting rod.

[0008] According to the technical scheme, the pressure sensor is fixed on the inner wall of the water tank, and the pressure sensor is electrically connected with the control panel. When water in the water tank is added, the water pressure can extrude the piston plate to move, so that the piston plate drives the L-shaped block to move and the L-shaped block does not extrude the inclined surface plate.

[0009] According to the technical scheme, the pressing device comprises a push rod, a pressing plate, a disc, a reset spring, a moving plate, a sliding groove, an extrusion column, a connecting block and a positioning disc. The push rod is fixed on the side wall of the piston plate, the disc is fixed on the outer wall of the push rod, one side of the reset spring is fixed on the side wall of the disc, the other side of the reset spring is fixed on the outer wall of the water tank, and the pressing plate is fixed on the end point of the push rod.

[0010] According to the technical scheme, the moving plate is slidably installed on the outer wall of the water tank, the sliding groove is formed in the moving plate, the connecting block is fixed on the side wall of the moving plate, and the positioning disc is fixed on the side of the connecting block away from the moving plate.

[0011] According to the technical scheme, the extrusion column is fixed on the inner side of the pressing plate, the outer wall of the extrusion column is matched with the inner wall of the sliding groove, when the piston plate moves, the push rod can be driven to move, when the push rod moves, the pressing plate can extrude the steel rope, and when the pressing plate moves, the extrusion column can extrude the sliding groove, so that the moving plate moves under the extrusion force.

[0012] According to the technical scheme, the limiting device is arranged on the supporting plate, and the limiting device comprises a transmission plate, a fixed block, a return spring, a connecting block, an extrusion column, a push spring, a pull rod, a limiting disc and a limiting hole. The transmission plate penetrates the supporting plate and is slidably connected at the penetrating position, the fixed block is fixed on the side wall of the transmission plate, the top of the return spring is fixed on the bottom of the fixed block, and the bottom of the return spring is fixed on the top of the supporting plate.

[0013] According to the technical scheme, the connecting block is fixed on the top of the transmission plate, the limiting column is slidingly installed on the inner wall of the connecting block, the pull rod is fixed on the side wall of the limiting column, one side of the push spring is fixed on the inner wall of the connecting block, the other side of the push spring is fixed on the side wall of the limiting column, the limiting disc is fixed on the outer wall of the rotating rod, the limiting holes are arranged in multiple groups and are arranged in a circumferential array on the side wall of the limiting disc, when the pressing plate moves, the bottom inclined surface of the transmission plate can be extruded, and the transmission plate can be driven to move upward.

[0014] The application provides a semi-submersible drilling ship for a harsh environment.

[0015] 1. The application sets up the stabilizing device, when encountering bad weather such as strong wind, the water pump is started, the water suction pipe can suck seawater into the water tank, so that the overall gravity of the ship body is increased, the stability of the ship body is improved, and the problem that the ship body shakes violently when the wind on the sea is too strong is solved; when the water tank is full of water, the water pressure extrudes the piston plate to move, the piston plate extrudes the pressure sensor, the pressure sensor is extruded to send an electric signal to the control panel, the water pump is closed to stop water flow from being delivered into the water tank, and when the piston plate moves, the L-shaped block can extrude the inclined surface block, the connecting spring is in a stretched state, the inclined surface block is driven to move downward, the inclined surface block shields the water flow output end of the water pump, and the problem that water flow in the water tank flows away through the water pump and the water suction pipe is solved.

[0016] 2. The application sets up the pressing device, when the piston plate moves in the water tank, the push rod is driven to move, the two groups of pressing plates can approach each other to press the steel rope, the steel rope is prevented from shaking forward and backward, the problem that the steel rope drives the drilling equipment to shake on the ship body when the wind is too strong, and the steel rope is easily broken is solved; when the pressing plate moves, the extrusion column extrudes the inclined groove of the sliding groove, so that the moving plate is extruded to move, the positioning disc is extruded on the steel rope through the connecting block, the left and right positions of the steel rope are limited and stabilized, and the stability of the steel rope is further improved.

[0017] 3. The application sets up the limiting device, when the pressing plate moves, the pressing plate extrudes the bottom inclined surface of the transmission plate, so that the transmission plate is driven to move upward, when the transmission plate moves upward, the limiting column and the limiting hole and the push spring are matched, when the wind on the sea is too strong and the self-locking function of the motor is unstable, the steel rope is loosened from the winding roller, the limiting column can be inserted into the limiting hole to position the rotating rod again, the steel rope is prevented from being loosened from the winding roller and the drilling equipment from falling into the sea. BRIEF DESCRIPTION OF DRAWINGS

[0018] Figure 1 is a schematic diagram of the overall structure of the present application;

[0019] Figure 2 is a schematic diagram of the overall structure of the present application;

[0020] Figure 3 is a schematic diagram of the partial cross-sectional structure of the present application;

[0021] Figure 4 is a schematic diagram of the partial cross-sectional structure of the present application;

[0022] Figure 5 is a schematic diagram of the compression device structure of the present application;

[0023] Figure 6 is a schematic diagram of the partial structure of the compression device of the present application;

[0024] Figure 7 is an enlarged schematic diagram of the A structure of the present application Figure 3 ;

[0025] Figure 8 is an enlarged schematic diagram of the B structure of the present application Figure 4 .

[0026] In the figure: 1, hull; 2, support column; 3, support plate; 4, fixed plate; 5, motor; 6, rotating rod; 7, winding roller; 8, steel rope; 9, mounting plate; 10, drilling equipment; 111, control panel; 112, water tank; 113, water pump; 114, water suction pipe; 115, water discharge pipe; 116, piston plate; 117, connecting rod; 118, connecting spring; 119, inclined block; 120, L-shaped block; 121, pressure sensor; 131, push rod; 132, disc; 133, return spring; 134, compression plate; 135, moving plate; 136, extrusion column; 137, sliding groove; 138, connecting block; 139, positioning disc; 141, transmission plate; 142, fixed block; 143, return spring; 144, connecting block; 145, limiting column; 146, pull rod; 147, push spring; 148, limiting disc; 149, limiting hole. DETAILED DESCRIPTION

[0027] The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, rather than all the embodiments of the present application. Based on the embodiments in the present application, all other embodiments obtained by those of ordinary skill in the art without creative work fall within the protection scope of the present application.

[0028] Please refer to Figures 1-8One embodiment of the present application is: a semi-submersible drilling ship for harsh environments, comprising a hull 1, a support column 2 fixed to the top of the hull 1, a support plate 3 fixed to the top of the support column 2, a fixed plate 4 fixed to the top of the support plate 3, a motor 5 fixed to the side wall of the fixed plate 4, a rotating rod 6 fixed to the output end of the motor 5, a winding roller 7 fixed to the outer wall of the rotating rod 6, a steel wire 8 wound on the outer wall of the winding roller 7, one end of the steel wire 8 fixed to the outer wall of the winding roller 7, the other end of the steel wire 8 fixed to a mounting plate 9, a drilling equipment 10 fixedly installed on the mounting plate 9, and a stabilizing device arranged at the bottom of the support plate 3 to improve the stability of the hull 1.

[0029] The stabilizing device comprises a control panel 111, a water tank 112, a water pump 113, a water suction pipe 114, a drain pipe 115, a piston plate 116, a connecting rod 117, a connecting spring 118, an inclined block 119, an L-shaped block 120 and a pressure sensor 121; the control panel 111 is fixed to the side wall of the support column 2, the water tank 112 is fixed to the bottom of the support plate 3, the water tank 112 is provided with two groups, and the two groups of water tanks 112 are symmetrically arranged with the center line in the vertical direction of the support plate 3 as the axis of symmetry, the water pump 113 is fixed to the side wall of the water tank 112, the water pump 113 and the control panel 111 are electrically connected, the side wall output end of the water pump 113 is in communication with the inside of the water tank 112, the water suction pipe 114 is fixed to the input end of the water pump 113, the piston plate 116 is slidingly installed on the inner wall of the water tank 112, the L-shaped block 120 is fixed to the side wall of the piston plate 116, the connecting rod 117 penetrates through the top of the water tank 112 and the support plate 3, and is slidingly connected at the penetration position, the bottom of the connecting spring 118 is fixed to the top of the support plate 3, the top of the connecting spring 118 is fixed to the top protruding position of the connecting rod 117, the inclined block 119 is fixed to the bottom of the connecting rod 117, and the pressure sensor 121 is fixed to the inner wall of the water tank 112, and the pressure sensor 121 and the control panel 111 are electrically connected.

[0030] When encountering strong winds and other harsh weather, the water pump 113 is started to enable the water suction pipe 114 to suck seawater into the water tank 112, thereby increasing the overall gravity of the hull 1 and improving the stability of the hull 1, solving the problem of the hull 1 shaking violently when the wind force on the sea is too large;

[0031] When the water tank 112 is filled with water, the water pressure will push the piston plate 116 to move, and the piston plate 116 will press the pressure sensor 121, and the pressure sensor 121 will send an electric signal to the control panel 111, and the water pump 113 will be closed to stop the water flow into the water tank 112. When the piston plate 116 moves, the L-shaped block 120 will not press the inclined block 119, and the inclined block 119 will move downward to block the water outlet of the water pump 113, and the problem of water flowing through the water pump 113 and the water suction pipe 114 is solved.

[0032] When the water tank 112 is filled with water, the water pressure will push the piston plate 116 to move, and the piston plate 116 will press the pressure sensor 121, and the pressure sensor 121 will send an electric signal to the control panel 111, and the water pump 113 will be closed to stop the water flow into the water tank 112. When the piston plate 116 moves, the L-shaped block 120 will not press the inclined block 119, and the inclined block 119 will move downward to block the water outlet of the water pump 113, and the problem of water flowing through the water pump 113 and the water suction pipe 114 is solved.

[0033] Please refer to Figures 1-8On the basis of the above embodiment, in another embodiment of the application, the stabilizing device is provided with a pressing device for preventing the steel rope 8 from shaking, the pressing device comprising a push rod 131, a pressing plate 134, a disc 132, a return spring 133, a moving plate 135, a sliding groove 137, a pressing column 136, a connecting block 138 and a positioning disc 139; the push rod 131 is fixed to the side wall of the piston plate 116, the disc 132 is fixed to the outer wall of the push rod 131, one side of the return spring 133 is fixed to the side wall of the disc 132, the other side of the return spring 133 is fixed to the outer wall of the water tank 112, the pressing plate 134 is fixed to the end point of the push rod 131, the moving plate 135 is slidingly installed on the outer wall of the water tank 112, the sliding groove 137 is formed in the moving plate 135, the connecting block 138 is fixed to the side wall of the moving plate 135, the positioning disc 139 is fixed to the side of the connecting block 138 away from the moving plate 135, and the pressing column 136 is fixed to the inner side of the pressing plate 134, and the outer wall of the pressing column 136 is in contact with the inner wall of the sliding groove 137.

[0034] One section of the sliding groove 137 is a straight groove, and one section is an inclined groove, so that when the pressing column 136 moves in the straight groove section of the sliding groove 137, the moving plate 135 is not subjected to extrusion force and does not move, and when the pressing column 136 moves in the inclined groove section of the sliding groove 137, the moving plate 135 is subjected to extrusion force and moves;

[0035] The pressing plate 134 is provided in two groups and symmetrically arranged about the center line in the vertical direction of the support plate 3 as the axis of symmetry, so that when the piston plate 116 moves in the water tank 112, the push rod 131 is driven to move, the two groups of pressing plates 134 can approach each other, the steel rope 8 is pressed, and the forward and backward shaking of the steel rope 8 is prevented, thereby solving the problem that the excessive wind force causes the steel rope 8 to drive the drilling equipment 10 to shake on the ship body 1, and the steel rope 8 is easily broken;

[0036] When the pressing plate 134 moves, the pressing column 136 extrudes the inclined groove section of the sliding groove 137, so that the moving plate 135 is subjected to extrusion force and moves, and through the connecting block 138, the positioning disc 139 is extruded on the steel rope 8 to limit and stabilize the left and right positions of the steel rope 8, thereby further improving the stability of the steel rope 8;

[0037] The pressing plate 134 and the positioning disc 139 are made of rubber, so that when the steel rope 8 is extruded, the steel rope 8 is prevented from being scratched.

[0038] The limiting device is arranged on the support plate 3, and comprises a transmission plate 141, a fixed block 142, a return spring 143, a connecting block 144, a limiting column 145, a push spring 147, a pull rod 146, a limiting disc 148 and limiting holes 149. The transmission plate 141 penetrates through the support plate 3 and is slidably connected at the penetration position. The fixed block 142 is fixed to the side wall of the transmission plate 141. The top of the return spring 143 is fixed to the bottom of the fixed block 142, and the bottom of the return spring 143 is fixed to the top of the support plate 3. The connecting block 144 is fixed to the top of the transmission plate 141. The limiting column 145 is slidably arranged on the inner wall of the connecting block 144. The pull rod 146 is fixed to the side wall of the limiting column 145. One side of the push spring 147 is fixed to the inner wall of the connecting block 144, and the other side of the push spring 147 is fixed to the side wall of the limiting column 145. The limiting disc 148 is fixed to the outer wall of the rotating rod 6. The limiting holes 149 are arranged in a plurality of groups and are arranged in a circumferential array on the side wall of the limiting disc 148.

[0039] When the pressing plate 134 moves, the pressing plate 134 can extrude the bottom inclined surface of the transmission plate 141, so that the transmission plate 141 moves upward. When the transmission plate 141 moves upward, the limiting column 145, the limiting hole 149 and the push spring 147 are matched. When the wind on the sea is too large, and when the self-locking function of the motor 5 is unstable, the steel wire 8 can be loosened from the winding roller 7, the limiting column 145 can be inserted into the limiting hole 149, the rotating rod 6 can be positioned again, the steel wire 8 can be prevented from being loosened from the winding roller 7, and the drilling equipment 10 can be prevented from falling into the sea.

[0040] When the piston plate 116 moves away from the water pump 113, the piston plate 116 drives the push rod 131 to move, the push rod 131 extends from the water tank 112, and when the push rod 131 moves, the pressing plate 134 moves, and the two groups of pressing plates 134 move close to each other. When the push rod 131 moves, the push rod 131 drives the disc 132 to move, so that the return spring 133 is stretched, the two groups of pressing plates 134 extrude and position the steel wire 8, and when the two groups of pressing plates 134 move close to each other, the pressing plate 134 drives the extrusion column 136 to move, the extrusion column 136 moves in the straight groove section of the sliding groove 137 first, and when the extrusion column 136 moves to the inclined groove section of the sliding groove 137, the extrusion column 136 extrudes the inclined groove section of the sliding groove 137, the moving plate 135 is extruded and moves, the moving plate 135 drives the connecting block 138 to move, and the positioning disc 139 extrudes and positions the left and right positions of the steel wire 8.

[0041] And when the seawater is discharged from the drain pipe 115, the piston plate 116 is not extruded by water, the return spring 133 is in tension, the return spring 133 drives the push rod 131 to reset, the push rod 131 drives the piston plate 116 to reset, when the piston plate 116 resets, and the elastic coefficient of the return spring 133 is five times that of the connecting spring 118, the L-shaped block 120 extrudes the inclined surface of the inclined block 119, the inclined block 119 can move upward under the extrusion, the inclined block 119 does not block the output end of the water pump 113, and the next water filling operation can be performed. When the push rod 131 resets, the compression plate 134 can be reset, the compression plate 134 moves towards the water tank 112, when the compression plate 134 moves, the extrusion column 136 extrudes the inclined groove section inner wall of the chute 137, so that the moving plate 135 is extruded, the two groups of moving plates 135 are away from each other, the connecting block 138 drives the positioning disc 139 to reset;

[0042] When the two groups of compression plates 134 move close to each other, the compression plate 134 extrudes the bottom inclined surface of the transmission plate 141, the transmission plate 141 can move upward under the extrusion, when the transmission plate 141 moves upward, the fixed block 142 moves upward, the return spring 143 is stretched, and when the transmission plate 141 moves upward, the limiting column 145 is aligned with the limiting hole 149. Because the push spring 147 is in a compressed state, the push spring 147 drives the limiting column 145 to extend into the limiting hole 149, so that the limiting disc 148 and the rotating rod 6 are limited, and when the limiting column 145 moves upward and is not aligned with the limiting hole 149, because the limiting hole 149 is provided with a plurality of groups, when the wind is too large, the motor 5 is unstable, the rotating rod 6 drives the limiting disc 148 to rotate, the limiting hole 149 on the limiting disc 148 rotates to align with the limiting column 145, and through the cooperation of the push spring 147, the limiting column 145 can also extend into the limiting hole 149 to limit the limiting disc 148 and the rotating rod 6. When the compression plate 134 resets and does not extrude the bottom inclined surface of the transmission plate 141, and the staff can pull the pull rod 146 to drive the limiting column 145 to move out of the limiting hole 149, so that the limiting of the limiting disc 148 is released, and because the return spring 143 is in a stretched state, the return spring 143 can drive the transmission plate 141 to move downward to reset, and the winding roller 7 can normally perform winding and unwinding operations.

[0043] While embodiments of the application have been shown and described, it is to be understood that the embodiments described are merely exemplary of the principles and application of the present application. Numerous modifications and adaptions can be effected without departing from the spirit and scope of the present application, which is not limited to the exact construction and arrangement described. It is intended, therefore, to cover all modifications and adaptions that fall within the scope of the claims and their equivalents.

Claims

1. A semi-submersible drilling vessel for use in harsh environments comprising a hull (1), characterised in that: The top of the ship body (1) is fixed with a support column (2), the top of the support column (2) is fixed with a support plate (3), the top of the support plate (3) is fixed with a fixed plate (4), the side wall of the fixed plate (4) is fixed with a motor (5), the output end of the motor (5) is fixed with a rotating rod (6), the outer wall of the rotating rod (6) is fixed with a winding roller (7), the outer wall of the winding roller (7) is wound with a steel wire rope (8), one end of the steel wire rope (8) is fixed on the outer wall of the winding roller (7), the other end of the steel wire rope (8) is fixed with a mounting plate (9), the drilling equipment (10) is fixedly installed on the mounting plate (9), the bottom of the support plate (3) is provided with a stabilizing device for improving the stability of the ship body (1), and the stabilizing device is provided with a pressing device for preventing the steel wire rope (8) from shaking. Wherein, the stabilizing device comprises a control panel (111), a water tank (112), a water pump (113), a water suction pipe (114), a drain pipe (115), a piston plate (116), a connecting rod (117), a connecting spring (118), an inclined block (119), an L-shaped block (120) and a pressure sensor (121); the control panel (111) is fixed on the side wall of the support column (2), the water tank (112) is fixed on the bottom of the support plate (3), the water pump (113) is fixed on the side wall of the water tank (112), and the water pump (113) and the control panel (111) are electrically connected, the side wall output end of the water pump (113) is communicated with the inside of the water tank (112), and the water suction pipe (114) is fixed on the input end of the water pump (113). The piston plate (116) is slidably installed on the inner wall of the water tank (112), the L-shaped block (120) is fixed on the side wall of the piston plate (116), the connecting rod (117) penetrates through the top of the water tank (112) and the support plate (3), and the penetrating portion is slidably connected, the bottom of the connecting spring (118) is fixed on the top of the support plate (3), the top of the connecting spring (118) is fixed on the top protruding portion of the connecting rod (117), and the inclined block (119) is fixed on the bottom of the connecting rod (117). The pressing device comprises a push rod (131), a pressing plate (134), a disc (132), a reset spring (133), a moving plate (135), a sliding groove (137), a extrusion column (136), a connecting block (138) and a positioning disc (139); the push rod (131) is fixed on the side wall of the piston plate (116), the disc (132) is fixed on the outer wall of the push rod (131), one side of the reset spring (133) is fixed on the side wall of the disc (132), the other side of the reset spring (133) is fixed on the outer wall of the water tank (112), and the pressing plate (134) is fixed on the end point of the push rod (131).

2. A semi-submersible drilling vessel for use in harsh environments according to claim 1, characterized in that: The pressure sensor (121) is fixed on the inner wall of the water tank (112), and the pressure sensor (121) and the control panel (111) are electrically connected.

3. The semi-submersible drilling vessel for use in harsh environments of claim 1, wherein: The mobile plate (135) is slidingly installed on the outer wall of the water tank (112), the sliding groove (137) is arranged on the mobile plate (135), the connecting block (138) is fixed on the side wall of the mobile plate (135), and the positioning disc (139) is fixed on the side, away from the mobile plate (135), of the connecting block (138).

4. A semi-submersible drilling vessel for use in harsh environments according to claim 3, characterized in that: The extrusion column (136) is fixed on the inner side of the pressing plate (134), and the outer wall of the extrusion column (136) is attached to the inner wall of the sliding groove (137).

5. The semi-submersible drilling vessel for use in harsh environments of claim 1, wherein: The supporting plate (3) is further provided with a limiting device, the limiting device comprises a transmission plate (141), a fixed block (142), a return spring (143), a connecting block (144), a limiting column (145), a push spring (147), a pull rod (146), a limiting disc (148) and a limiting hole (149), the transmission plate (141) penetrates through the supporting plate (3) and is slidingly connected at the penetration position, the fixed block (142) is fixed on the side wall of the transmission plate (141), the top of the return spring (143) is fixed on the bottom of the fixed block (142), and the bottom of the return spring (143) is fixed on the top of the supporting plate (3).

6. A semi-submersible drilling vessel for use in harsh environments as claimed in claim 5, characterised in that: The connecting block (144) is fixed on the top of the transmission plate (141), the limiting column (145) is slidingly installed on the inner wall of the connecting block (144), the pull rod (146) is fixed on the side wall of the limiting column (145), one side of the push spring (147) is fixed on the inner wall of the connecting block (144), the other side of the push spring (147) is fixed on the side wall of the limiting column (145), the limiting disc (148) is fixed on the outer wall of the rotating rod (6), and the limiting hole (149) is provided with a plurality of groups and is arranged in a circumferential array on the side wall of the limiting disc (148).

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