Semi-submersible drilling ship used in severe environment

Abstract

The invention discloses a semi-submersible drilling ship used in the severe environment, and relates to the technical field of semi-submersible drilling ships used in the severe environment. The semi-submersible drilling ship used in the severe environment comprises a ship body, a supporting column is fixed to the top of the ship body, and 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. When the semi-submersible drilling ship used in the severe environment encounters severe weather such as strong wind, seawater can be sucked into the water tank through the water suction pipe by starting the water pump, so that the overall gravity of the ship body can be increased, the stability of the ship body is improved, and the problem that the ship body shakes violently when the wind power on the seawater is too large is solved.

Description

Technical Field

[0001] This invention relates to the field of semi-submersible drilling vessel technology for harsh environments, specifically to a semi-submersible drilling vessel for harsh environments. Background Technology

[0002] A semi-submersible drilling vessel is a floating drilling platform, typically converted from a motorized vessel or barge, used for oil and gas exploration drilling operations in deeper waters. Its design combines the advantages of a bottom-mounted platform and a drilling vessel, balancing stability and deep-water operation capabilities, making it one of the important pieces of equipment for modern offshore oil and gas development.

[0003] Existing semi-submersible drilling vessels, when operating at sea, may experience significant swaying due to the generally large waves and harsh environments, posing safety risks to personnel. In view of this, we propose a semi-submersible drilling vessel for use in harsh environments. Summary of the Invention

[0004] To address the shortcomings of existing technologies, this invention provides a semi-submersible drilling vessel for harsh environments, solving the problems mentioned in the background section.

[0005] To achieve the above objectives, the present invention provides the following technical solution: a semi-submersible drilling vessel for harsh environments, comprising a hull, a support column fixed to the top of the hull, a support plate fixed to the top of the support column, a fixing plate fixed to the top of the support plate, a motor fixed to the side wall of the fixing 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, and an installation plate fixed to the other end of the steel rope. Drilling equipment is fixedly installed on the installation plate, and a stabilizing device for improving the stability of the hull is provided at the bottom of the support plate. A clamping device for preventing the steel rope from swaying is provided on the stabilizing device. The stabilizing device includes a control panel, a water tank, a water pump, a 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 to the control panel, the output end of the water pump is connected to the inside of the water tank, and the suction pipe is fixed to the input end of the water pump. When the water pump is started through the control panel, the end of the suction pipe is inserted into the seawater, thereby stimulating the water pump to draw seawater into the water tank, filling the water tank with water, and increasing the overall weight of the hull.

[0006] According to the above technical solution, 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 passes through the top of the water tank and the support plate, and is slidably connected at the passage, the bottom of the connecting spring is fixed to the top of the support plate, the top of the connecting spring is fixed to the top protrusion of the connecting rod, and the inclined block is fixed to the bottom of the connecting rod.

[0007] According to the above technical solution, the pressure sensor is fixed on the inner wall of the water tank and is electrically connected to the control panel. When water is added to the water tank, the water pressure can squeeze the piston plate, causing the piston plate to move. This allows the piston plate to drive the L-shaped block to move, preventing the L-shaped block from squeezing the inclined panel.

[0008] According to the above technical solution, the clamping device includes a push rod, a clamping plate, a disc, a return spring, a moving plate, a slide groove, a pressing column, a connecting block, and a positioning disc; the push rod is fixed to the side wall of the piston plate, the disc is fixed to the outer wall of the push rod, one side of the return spring is fixed to the side wall of the disc, the other side of the return spring is fixed to the outer wall of the water tank, and the clamping plate is fixed to the end point of the push rod.

[0009] According to the above technical solution, the movable plate is slidably installed on the outer wall of the water tank, the sliding groove is opened on the movable plate, the connecting block is fixed on the side wall of the movable plate, and the positioning plate is fixed on the side of the connecting block away from the movable plate.

[0010] According to the above technical solution, the extrusion column is fixed on the inner side of the pressure plate, and the outer wall of the extrusion column is in contact with the inner wall of the slide groove. When the piston plate moves, it can drive the push rod to move. When the push rod moves, it can drive the pressure plate to extrude the steel rope. When the pressure plate moves, it can cause the extrusion column to extrude the slide groove, so that the moving plate moves under the extrusion force.

[0011] According to the above technical solution, the device further includes a limiting device, which is disposed on the support plate. The limiting device includes a transmission plate, a fixing block, a return spring, a connecting block, a limiting post, a pushing spring, a pull rod, a limiting disc, and a limiting hole. The transmission plate passes through the support plate and is slidably connected at the through point. The fixing block is fixed to the side wall of the transmission plate. The top of the return spring is fixed to the bottom of the fixing block, and the bottom of the return spring is fixed to the top of the support plate.

[0012] According to the above technical solution, the connecting block is fixed to the top of the transmission plate, the limiting post is slidably installed on the inner wall of the connecting block, the pull rod is fixed to the side wall of the limiting post, one side of the push spring is fixed to the inner wall of the connecting block, the other side of the push spring is fixed to the side wall of the limiting post, the limiting plate is fixed to the outer wall of the rotating rod, and multiple sets of limiting holes are provided and arranged in a circumferential array on the side wall of the limiting plate. When the pressing plate moves, it can squeeze the bottom inclined surface of the transmission plate, which can drive the transmission plate to move upward.

[0013] This invention provides a semi-submersible drilling vessel for use in harsh environments. It has the following advantages: 1. This invention, by incorporating a stabilizing device, allows the water pump to draw seawater into the tank via the suction pipe during severe weather such as strong winds. This increases the overall weight of the hull, improving its stability and solving the problem of violent swaying caused by strong winds. Furthermore, when the tank is full, the water pressure causes the piston plate to move, pressing against a pressure sensor. This pressure sensor sends an electrical signal to the control panel, shutting down the water pump and stopping the flow of water into the tank. Simultaneously, the piston plate's movement prevents the L-shaped block from pressing against the inclined block. Because the connecting spring is stretched, the inclined block moves downwards, blocking the water pump's output and preventing water from flowing away through the pump and suction pipe. 2. This invention, by setting up a clamping device, enables the piston plate to move and drive the push rod to move when it moves in the water tank. This allows the two sets of clamping plates to move closer together and clamp the steel rope, preventing it from swaying back and forth. This solves the problem that excessive wind force can cause the steel rope to sway on the hull and easily break the steel rope. Furthermore, when the clamping plate moves, it can cause the extrusion column to press against the inclined groove of the slide, thereby causing the moving plate to move under the extrusion force. Through the connecting block, the positioning plate can be pressed against the steel rope, limiting and stabilizing the left and right position of the steel rope, further improving the stability of the steel rope. 3. The present invention is equipped with a limiting device. When the pressure plate moves, it can squeeze the bottom inclined surface of the transmission plate, thereby driving the transmission plate to move upward. When the transmission plate moves upward, through the cooperation of the limiting post, the limiting hole and the push spring, when the wind force on the sea surface is too strong or the motor self-locking function is unstable, the steel rope will be released from the winding roller. The limiting post can also extend into the limiting hole to perform secondary positioning of the rotating rod, preventing the steel rope from being released from the winding roller and causing the drilling equipment to fall into the sea. Attached Figure Description

[0014] Figure 1 This is a schematic diagram of the overall structure of the present invention; Figure 2 This is a schematic diagram of the overall structure of the present invention; Figure 3 This is a partial cross-sectional view of the present invention; Figure 4 This is a partial cross-sectional view of the present invention; Figure 5 This is a schematic diagram of the pressing device structure of the present invention; Figure 6 This is a schematic diagram of the pressing device of the present invention; Figure 7 For the present invention Figure 3 Enlarged schematic diagram of structure A; Figure 8 For the present invention Figure 4 An enlarged schematic diagram of the B structure.

[0015] In the diagram: 1. Hull; 2. Support column; 3. Support plate; 4. Fixing 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. Suction pipe; 115. Drain pipe; 116. Piston plate; 117. Connecting rod; 118. Connecting spring; 119. Inclined block; 120. L-shaped block; 121. Pressure... Force sensor; 131, push rod; 132, disc; 133, return spring; 134, pressure plate; 135, moving plate; 136, extrusion column; 137, slide groove; 138, connecting block; 139, positioning plate; 141, transmission plate; 142, fixing block; 143, return spring; 144, connecting block; 145, limit post; 146, pull rod; 147, push spring; 148, limit plate; 149, limit hole. Detailed Implementation

[0016] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0017] Please see Figures 1-8One embodiment of the present invention is: a semi-submersible drilling vessel 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 fixing plate 4 fixed to the top of the support plate 3, a motor 5 fixed to the side wall of the fixing 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 rope 8 wound around the outer wall of the winding roller 7, one end of the steel rope 8 fixed to the outer wall of the winding roller 7, and an installation plate 9 fixed to the other end of the steel rope 8. A drilling equipment 10 is fixedly installed on the installation plate 9, and a stabilizing device for improving the stability of the hull 1 is provided at the bottom of the support plate 3. The stabilizing device includes a control panel 111, a water tank 112, a water pump 113, a 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, and the water tank 112 is fixed to the bottom of the support plate 3. Two sets of water tanks 112 are provided, and the two sets of water tanks 112 are symmetrically arranged about the center line of the vertical direction of the support plate 3. The water pump 113 is fixed to the side wall of the water tank 112 and is electrically connected to the control panel 111. The side wall of the water pump 113 outputs water. The end is connected to the inside of the water tank 112. The suction pipe 114 is fixed to 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 to the side wall of the piston plate 116. The connecting rod 117 passes through the top of the water tank 112 and the support plate 3, and is slidably connected at the passage. The bottom of the connecting spring 118 is fixed to the top of the support plate 3, and the top of the connecting spring 118 is fixed to the top protrusion of the connecting rod 117. The inclined block 119 is fixed to the bottom of the connecting rod 117. The pressure sensor 121 is fixed to the inner wall of the water tank 112. The pressure sensor 121 is electrically connected to the control panel 111.

[0018] When encountering severe weather such as strong winds, the water pump 113 can be activated to draw seawater into the water tank 112 through the suction pipe 114, thereby increasing the overall weight of the hull 1, improving the stability of the hull 1, and solving the problem of the hull 1 shaking violently when the wind is too strong at sea. When the water tank 112 is full of water, the water pressure will cause the piston plate 116 to move, which in turn will press the pressure sensor 121. The pressure sensor 121 will then send an electrical signal to the control panel 111, which will shut down the water pump 113 and stop the water flow into the water tank 112. At the same time as the piston plate 116 moves, it will also cause the L-shaped block 120 to stop pressing the inclined block 119. Because the connecting spring 118 is in a stretched state, it will cause the inclined block 119 to move downward, blocking the water flow output end of the water pump 113. This solves the problem of water flowing out of the water tank 112 through the water pump 113 and the suction pipe 114.

[0019] In this embodiment, during severe windy weather at sea, the water pump 113 is activated. Water is drawn in through the suction pipe 114 and pumped into the water tank 112 through its output. This increases the weight of the water tank 112, thus increasing the weight of the hull 1 and improving its stability. When seawater enters the water tank 112 and becomes excessive, the water pressure compresses the piston plate 116, moving it away from the water pump 113. When the piston plate 116 moves to compress the pressure sensor 121... The pressure sensor 121 is subjected to compressive force and emits an electrical signal, which is then transmitted to the control panel 111. The control panel 111 can then control the water pump 113 to shut down, stopping the addition of water to the water tank 112. As the piston plate 116 moves away from the water pump 113, the L-shaped block 120 moves to a position where it is no longer in contact with the inclined block 119. Because the connecting spring 118 is in a stretched state, it can drive the connecting rod 117 to move downward. When the connecting rod 117 moves downward, it can drive the inclined block 119 to move downward, blocking the output end of the water pump 113. Please see Figures 1-8Based on the above embodiments, in another embodiment of the present invention, the stabilizing device is provided with a clamping device to prevent the steel rope 8 from swaying. The clamping device includes a push rod 131, a clamping plate 134, a disc 132, a return spring 133, a moving plate 135, a slide 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, and one side of the return spring 133 is fixed to the disc 132. The other side of the return spring 133 is fixed to the outer wall of the water tank 112. The pressure plate 134 is fixed to the end of the push rod 131. The moving plate 135 is slidably installed on the outer wall of the water tank 112. The slide groove 137 is opened on the moving plate 135. The connecting block 138 is fixed to the side wall of the moving plate 135. The positioning plate 139 is fixed on the side of the connecting block 138 away from the moving plate 135. The squeezing column 136 is fixed to the inner side of the pressure plate 134. The outer wall of the squeezing column 136 is in contact with the inner wall of the slide groove 137.

[0020] One section of the chute 137 is a straight chute and the other section is an inclined chute. When the extrusion column 136 moves in the straight chute section of the chute 137, the moving plate 135 is not subjected to extrusion force and does not move. When the extrusion column 136 moves in the inclined chute section of the chute 137, the moving plate 135 is subjected to extrusion force and moves. Two sets of clamping plates 134 are provided, and the two sets of clamping plates 134 are symmetrically arranged with the center line of the vertical direction of the support plate 3 as the axis of symmetry. When the piston plate 116 moves in the water tank 112, it can drive the push rod 131 to move, so that the two sets of clamping plates 134 can move closer to each other and clamp the steel rope 8 to prevent it from swaying back and forth. This solves the problem that the steel rope 8 can easily break when the wind is too strong and causes the drilling equipment 10 to sway on the hull 1. Furthermore, when the clamping plate 134 moves, the extrusion column 136 can extrude the inclined section of the slide groove 137, thereby enabling the moving plate 135 to move under the extrusion force. Through the connecting block 138, the positioning plate 139 can be pressed onto the steel rope 8, limiting and stabilizing the left and right positions of the steel rope 8, further improving the stability of the steel rope 8. Furthermore, the clamping plate 134 and the positioning plate 139 are made of rubber, which prevents the steel rope 8 from being scratched when it is squeezed.

[0021] It also includes a limiting device, which is mounted on the support plate 3. The limiting device includes a transmission plate 141, a fixing block 142, a return spring 143, a connecting block 144, a limiting post 145, a pushing spring 147, a pull rod 146, a limiting disc 148, and a limiting hole 149. The transmission plate 141 passes through the support plate 3 and is slidably connected at the penetration point. The fixing 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 fixing block 142. The bottom 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 post 145 is slidably installed on the inner wall of the connecting block 144, the pull rod 146 is fixed to the side wall of the limiting post 145, one side of the push spring 147 is fixed to the inner wall of the connecting block 144, the other side of the push spring 147 is fixed to the side wall of the limiting post 145, the limiting plate 148 is fixed to the outer wall of the rotating rod 6, and multiple sets of limiting holes 149 are provided and are arranged in a circumferential array on the side wall of the limiting plate 148.

[0022] When the clamping plate 134 moves, it can press the bottom slope of the transmission plate 141, thereby driving the transmission plate 141 to move upward. When the transmission plate 141 moves upward, through the cooperation of the limiting post 145, the limiting hole 149 and the push spring 147, when the wind force on the sea surface is too strong and the self-locking function of the motor 5 is unstable, the steel rope 8 will be released from the winding roller 7, and the limiting post 145 can be inserted into the limiting hole 149 to perform secondary positioning of the rotating rod 6, preventing the steel rope 8 from being released from the winding roller 7 and causing the drilling equipment 10 to fall into the sea.

[0023] In this embodiment, when the piston plate 116 moves away from the water pump 113, it causes the piston plate 116 to move the push rod 131, extending the push rod 131 out of the water tank 112. As the push rod 131 moves, it also moves the pressure plate 134, bringing the two pressure plates 134 closer together. Furthermore, the push rod 131 moves the disc 132, stretching the return spring 133 and causing the two pressure plates 134 to compress the steel rope 8. Positioning, and when the two sets of clamping plates 134 approach each other, the clamping plates 134 can drive the extrusion column 136 to move, so that the extrusion column 136 first moves in the straight groove section of the slide 137, and when the extrusion column 136 moves to the inclined groove section of the slide 137, the extrusion column 136 will squeeze the inclined groove section of the slide 137, so that the moving plate 135 can move under the extrusion force, and the moving plate 135 will drive the connecting block 138 to move, so that the positioning plate 139 can squeeze and position the steel rope 8 in the left and right positions; When seawater is discharged from the drain pipe 115, the piston plate 116 is no longer subjected to water pressure. Because the return spring 133 is in a stretched state, it drives the push rod 131 to reset, which in turn drives the piston plate 116 to reset. When the piston plate 116 resets, and the spring force coefficient of the return spring 133 is five times that of the connecting spring 118, the L-shaped block 120 will press against the inclined surface of the inclined block 119, allowing the inclined block 119 to withstand the pressure. It can move upward so that the inclined block 119 does not block the output end of the water pump 113, so that the next water filling operation can be carried out. When the push rod 131 is reset, it can drive the pressure plate 134 to reset, so that the pressure plate 134 moves closer to the water tank 112. When the pressure plate 134 moves, it can cause the extrusion column 136 to extrude the inner wall of the inclined section of the slide 137, so that the moving plate 135 is subjected to extrusion force, which can cause the two sets of moving plates 135 to move away from each other, so that the connecting block 138 drives the positioning plate 139 to reset. When the two sets of clamping plates 134 approach each other, they can press the bottom slope of the transmission plate 141, causing the transmission plate 141 to move upward under the pressure. When the transmission plate 141 moves upward, it can drive the fixing block 142 to move upward, causing the return spring 143 to stretch. When the transmission plate 141 moves upward, it will align the limiting post 145 with the limiting hole 149. Because the push spring 147 is in a compressed state, it can drive the limiting post 145 to extend into the limiting hole 149, thereby limiting the limiting plate 148 and the rotating rod 6. When the limiting post 145 moves upward but does not align with the limiting hole 149, because there are multiple sets of limiting holes 149, when the wind force is too strong, it will cause the electric... When the self-locking mechanism of machine 5 is unstable, the rotating rod 6 drives the limiting plate 148 to rotate, causing the limiting hole 149 on the limiting plate 148 to rotate and align with the limiting post 145. With the cooperation of the pushing spring 147, the limiting post 145 can also extend into the limiting hole 149 to limit the limiting plate 148 and the rotating rod 6. When the pressing plate 134 is reset and no longer presses the bottom slope of the transmission plate 141, the operator can pull the pull rod 146 to move the limiting post 145 out of the limiting hole 149, thereby releasing the limitation on the limiting plate 148. Since 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 perform normal winding and unwinding operations.

[0024] Although embodiments of the invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A semi-submersible drilling vessel for use in harsh environments, comprising a hull (1), characterized in that: A support column (2) is fixed to the top of the hull (1), a support plate (3) is fixed to the top of the support column (2), a fixing plate (4) is fixed to the top of the support plate (3), a motor (5) is fixed to the side wall of the fixing plate (4), a rotating rod (6) is fixed to the output end of the motor (5), a winding roller (7) is fixed to the outer wall of the rotating rod (6), a steel rope (8) is wound around the outer wall of the winding roller (7), one end of the steel rope (8) is fixed to the outer wall of the winding roller (7), and the other end of the steel rope (8) is fixed to an installation plate (9). A drilling device (10) is fixedly installed on the installation plate (9). A stabilizing device to improve the stability of the hull (1) is provided at the bottom of the support plate (3), and a clamping device to prevent the steel rope (8) from swaying is provided on the stabilizing device. The stabilizing device includes a control panel (111), a water tank (112), a water pump (113), a 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 pump (113) is fixed to the side wall of the water tank (112), the water pump (113) is electrically connected to the control panel (111), the output end of the side wall of the water pump (113) is connected to the inside of the water tank (112), and the suction pipe (114) is fixed to the input end of the water pump (113).

2. The semi-submersible drilling vessel for harsh environments according to claim 1, characterized in that: The piston plate (116) is slidably mounted 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) passes through the top of the water tank (112) and the support plate (3), and is slidably connected at the point of penetration, 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 protrusion of the connecting rod (117), and the inclined block (119) is fixed on the bottom of the connecting rod (117).

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

4. The semi-submersible drilling vessel for harsh environments according to claim 3, characterized in that: The clamping device includes a push rod (131), a clamping plate (134), a disc (132), a return spring (133), a moving plate (135), a slide 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), and the clamping plate (134) is fixed to the end of the push rod (131).

5. The semi-submersible drilling vessel for harsh environments according to claim 4, characterized in that: The movable plate (135) is slidably mounted on the outer wall of the water tank (112), the slide groove (137) is opened on the movable plate (135), the connecting block (138) is fixed on the side wall of the movable plate (135), and the positioning plate (139) is fixed on the side of the connecting block (138) away from the movable plate (135).

6. The semi-submersible drilling vessel for harsh environments according to claim 5, characterized in that: The extrusion column (136) is fixed to the inner side of the pressure plate (134), and the outer wall of the extrusion column (136) is in contact with the inner wall of the groove (137).

7. The semi-submersible drilling vessel for harsh environments according to claim 1, characterized in that: It also includes a limiting device set on the support plate (3), the limiting device including a transmission plate (141), a fixing block (142), a return spring (143), a connecting block (144), a limiting post (145), a push spring (147), a pull rod (146), a limiting disc (148), and a limiting hole (149); the transmission plate (141) passes through the support plate (3) and is slidably connected at the through point, the fixing 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 fixing block (142), and the bottom of the return spring (143) is fixed to the top of the support plate (3).

8. The semi-submersible drilling vessel for harsh environments according to claim 7, characterized in that: The connecting block (144) is fixed to the top of the transmission plate (141), the limiting post (145) is slidably installed on the inner wall of the connecting block (144), the pull rod (146) is fixed to the side wall of the limiting post (145), one side of the push spring (147) is fixed to the inner wall of the connecting block (144), the other side of the push spring (147) is fixed to the side wall of the limiting post (145), the limiting plate (148) is fixed to the outer wall of the rotating rod (6), and multiple sets of limiting holes (149) are provided and are arranged in a circumferential array on the side wall of the limiting plate (148).

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