Dual tension protection winch for underwater blowout preventer

Abstract

The application discloses a double-tension protection winch for underwater blowout preventer, which comprises a rack, a drum mounted on the rack, a plurality of sets of tension devices uniformly fixed at one end of the drum, a large gear ring clamped at the other end of the plurality of sets of tension devices, a motor fixed at the rack near the large gear ring, a small gear set on an output shaft of the motor and engaged with the large gear ring, an arc-shaped frame welded at both ends of the drum, a cable arranging support fixed on the arc-shaped frame through bolts a, a lead screw installed between the two cable arranging supports along an axial direction of the drum, a lead screw sprocket set on the lead screw, a brake disc brake device installed on the rack near the large gear ring, and a hydraulic control system connected with the motor, the tension devices and the brake disc brake device. The double-tension protection winch for underwater blowout preventer is provided with the tension devices and the hydraulic control system for double-tension protection, so that the umbilical cable is prevented from being pulled off, and the cable arranging device is designed as a rotatable mode, thereby improving the versatility of the winch.

Description

Technical Field

[0001] This invention belongs to the field of marine oil and gas equipment technology, and relates to a winch with dual tension protection for underwater blowout preventers. Background Technology

[0002] The control system of the subsea blowout preventer (BOP) is installed on the drilling platform or ship and connected to the BOP via an umbilical cable. The umbilical cable is wound on a winch, and the winch is operated to raise and lower the umbilical cable. When the BOP is lowered or retrieved, the umbilical cable is also lowered or retrieved along with the BOP. At the same time, the BOP is connected to the riser. Underwater operation, the umbilical cable is in a constant tension control mode. The riser is affected by ocean currents and waves on the surface, which will cause some movement. The winch needs to raise and lower the umbilical cable according to the tension of the umbilical cable to prevent the umbilical cable from being pulled off. The umbilical cable is a multi-core cable, which is expensive, and damage to the umbilical cable will cause the BOP control to fail. If a blowout occurs, the wellhead cannot be closed.

[0003] Therefore, blowout preventer winches need to possess multiple functions. Conventional winches, for functions such as cable laying, constant tension, gear drive, and clutch, all have dedicated mechanisms, resulting in numerous structural components, occupying a large amount of installation space, and are not compact enough. Furthermore, tension control is achieved through a constant tension control valve, which adjusts the constant tension by setting a pressure. If the control valve or control system malfunctions, the tension becomes uncontrollable, and the movement of the riser can cause the umbilical cable to be pulled back, posing a risk of breakage. In addition, the rope exit angle of the cable laying device in traditional winches is determined by the position of the guide pulley. Since the structure of each platform or ship is different, the winch and guide pulley positions also vary. Blowout preventer winches are specially designed, requiring a new cable laying device to be designed for each platform, which is inflexible and lacks versatility. Summary of the Invention

[0004] The purpose of this invention is to provide a dual-tension protection winch for underwater blowout preventers, which solves the problems of existing winches having complex and non-compact structures, easy breakage of umbilical cables, and poor versatility.

[0005] The technical solution adopted in this invention is a double tension protection winch for an underwater blowout preventer, comprising a frame, a drum mounted on the frame, several sets of tension devices evenly distributed and fixed at one end of the drum, and a large gear ring clamped at the other end of the several sets of tension devices; a motor fixed on the frame near the large gear ring, a pinion gear set on the output shaft of the motor, the pinion gear meshing with the large gear ring; arc-shaped frames welded to both ends of the drum on the frame, the arc-shaped frames fixing cable laying supports by bolts a, a lead screw installed between the two cable laying supports along the axial direction of the drum, and a lead screw sprocket set on the lead screw; a brake disc brake device installed on the frame near the large gear ring; and a hydraulic control system connected to the motor, tension devices and brake disc brake device respectively.

[0006] The invention is further characterized by:

[0007] The arc-shaped frame has several evenly spaced mounting holes, and bolts a are placed inside the mounting holes. Guide wheels are also provided on both sides of the arc-shaped frame.

[0008] The cable tray support is equipped with cable tray sprockets and clutch sprockets. The cable tray sprockets include sprockets a and b, the clutch sprockets include sprockets c and d, and the lead screw sprockets include sprockets e and f. Sprocket a meshes with the large gear ring, sprockets b and d are connected by chain a, sprockets c and e are connected by chain b, and sprocket f is fixed on the lead screw.

[0009] The clutch sprocket includes a rotating shaft, on which a sprocket c, a copper sleeve, and a handwheel are sequentially mounted. A sprocket d is mounted on one end of the copper sleeve and the handwheel. A support seat is mounted on the end of sprocket d closest to the handwheel. The support seat is fixed to the cable tray bracket by screws.

[0010] A steel ball is provided between the support base and the sprocket d. The support base has a pressure block and a locking block arranged radially at the steel ball. The handwheel has a spring II and a retaining ring at the end away from the sprocket d. The handwheel is limited by the retaining ring.

[0011] The tension device includes an upper support and a lower support. One end of the upper support is provided with an upper clamping plate and a lower clamping plate, and the other end of the upper support is fixed to one end of the lower support by screws. A large gear ring is set between the upper clamping plate and the lower clamping plate. The pressure plate, friction block mounting plate and friction block are symmetrically fixed between the upper clamping plate and the large gear ring, and between the lower clamping plate and the large gear ring, respectively, by screws. A tension cylinder is installed on the side of the lower clamping plate away from the fixed pressure plate.

[0012] The lower support is L-shaped, and the other end of the lower support is fixed to the roller with screws. An adjustment shim is also provided between the lower support and the roller.

[0013] The tension cylinder includes a cylinder body and a push rod. The push rod is fitted inside one end of the cylinder body, and the other end of the cylinder body is connected to the pressure cap by a thread. The push rod and the pressure cap are in contact, and a spring I is provided between the push rod and the pressure cap.

[0014] The cylinder block has control oil ports arranged radially, and the gland is also marked with graduations.

[0015] The hydraulic control system includes a proportional directional valve. One end of the proportional directional valve is connected to the motor through a tension control valve, and the other end of the proportional directional valve is connected to the disc brake control valve and the free-release control valve through a pressure reducing valve. The oil outlet of the disc brake control valve is connected to the brake disc brake device, and the oil outlet of the free-release control valve is connected to the tension device.

[0016] The beneficial effects of this invention are:

[0017] (1) The underwater blowout preventer double tension protection winch of the present invention integrates the drive device, cable laying device, brake, clutch and tension protection device into an integrated structure, reducing the number of unit equipment, and has a compact structure and high integration.

[0018] (2) The underwater blowout preventer of the present invention uses a double tension protection winch, which has a double tension protection function for the umbilical cable. A tension device is set up. When the hydraulic control system fails or malfunctions, the tension device is activated. The friction block slides to ensure that the umbilical cable is under normal force and to prevent the umbilical cable from being pulled off.

[0019] (3) The underwater blowout preventer of the present invention uses a double tension protection winch. The entire cable laying device is designed to be rotatable. It is fixed to the frame by bolt a and is equipped with guide wheels that can rotate around the center of the drum. The cable laying angle can be adjusted as needed to adapt to the installation requirements of different platforms or ships. Attached Figure Description

[0020] Figure 1 This is a front view of the dual tension protection winch for the underwater blowout preventer of the present invention;

[0021] Figure 2 This is a right view of the winch with dual tension protection for the underwater blowout preventer of the present invention;

[0022] Figure 3 This is an AA cross-sectional view of the winch protected by the present invention;

[0023] Figure 4 This is a front view of the tension device in the winch protected by this invention;

[0024] Figure 5 This is a cross-sectional view of the tension cylinder in the winch protected by this invention;

[0025] Figure 6 This is a BB cross-sectional view of the winch protected by the present invention;

[0026] Figure 7 This is a schematic diagram of the hydraulic control system in the winch protected by this invention.

[0027] In the diagram, 1. Frame, 2. Pinion, 3. Tension device, 3-1. Upper support, 3-2. Pressure plate, 3-3. Friction block mounting plate, 3-4. Friction block, 3-5. Tension cylinder, 3-5.1. Cylinder body, 3-5.2. Push rod, 3-5.3. Spring I, 3-5.4. Pressure cap, 3-5.5. Control oil port, 3-6. Lower support, 3-7. Adjusting shim, 4. Large gear ring, 5. Cable sprocket, 6. Clutch sprocket, 6-1. Rotating shaft, 6-2. Sprocket c 6-3. Sprocket d, 6-4. Support seat, 6-5. Copper sleeve, 6-6. Steel ball, 6-7. Lock block, 6-8. Pressure block, 6-9. Handwheel, 6-10. Retaining ring, 6-11. Spring II, 7. Cable support bracket, 8. Screw sprocket, 9. Arc frame, 10. Guide wheel, 11. Roller, 12. Brake disc brake device, 13. Motor, 14. Tension control valve, 15. Proportional directional valve, 16. Pressure reducing valve, 17. Disc brake control valve, 18. Free-fall control valve. Detailed Implementation

[0028] The present invention will now be described in detail with reference to the accompanying drawings and specific embodiments.

[0029] Example 1

[0030] The underwater blowout preventer of this invention uses a dual tension protection winch, such as... Figure 1 and Figure 2As shown, the system includes a frame 1, on which a roller 11 is mounted. Several sets of tension devices 3 are evenly distributed and fixed at one end of the roller 11, and the other end of the tension devices 3 clamps a large gear ring 4. A motor 13 is fixed to the frame 1 near the large gear ring 4. A pinion 2 is installed on the output shaft of the motor 13, and the pinion 2 meshes with the large gear ring 4. Arc-shaped frames 9 are welded to both ends of the roller 11 on the frame 1. The arc-shaped frames 9 are fixed to cable trays 7 by bolts a. A lead screw is installed between the two cable trays 7 along the axial direction of the roller 11, and a lead screw sprocket 8 is installed on the lead screw. A brake disc brake device 12 is installed on the frame 1 near the large gear ring 4. The brake disc brake device 12 clamps the outside of the large gear ring 4 to achieve braking. The system also includes a hydraulic control system, which is connected to the motor 13, the tension devices 3, and the brake disc brake device 12. The arc-shaped frame 9 has several mounting holes evenly distributed on it, and bolts a are installed in the mounting holes. Guide wheels 10 are also provided on both sides of the arc-shaped frame 9, so that the entire cable laying support 7 can rotate around the central axis of the roller 11, realizing a variable cable exit angle. The cable laying support 7 is equipped with a cable laying sprocket 5 and a clutch sprocket 6. The cable laying sprocket 5 includes sprocket a and sprocket b, and the clutch sprocket 6 includes sprocket c6-2 and sprocket d6-3. The lead screw sprocket 8 includes sprocket e and sprocket f. Sprocket a meshes with the large gear ring 4, sprocket b is connected to sprocket d6-3 through chain a, sprocket c6-2 is connected to sprocket e through chain b, and sprocket f is fixed on the lead screw. The power transmission relationship of the present invention can be seen from the above structure: First, the motor 13 drives the pinion 2 to rotate, the pinion 2 drives the large gear ring 4 to rotate, and the large gear ring 4 drives the drum 11 to rotate, thereby realizing the winch's winding and unwinding function; Second, the rotation of the large gear ring 4 drives the cable sprocket 5 to rotate, and the cable sprocket 5 transmits power to the lead screw sprocket 8 through the clutch sprocket 6, thereby driving the lead screw to rotate.

[0031] Example 2

[0032] The underwater blowout preventer of this invention uses a dual tension protection winch, such as... Figure 1 and Figure 2As shown, the system includes a frame 1, on which a roller 11 is mounted. Several sets of tension devices 3 are evenly distributed and fixed at one end of the roller 11, and the other end of the tension devices 3 clamps a large gear ring 4. A motor 13 is fixed to the frame 1 near the large gear ring 4. A pinion 2 is installed on the output shaft of the motor 13, and the pinion 2 meshes with the large gear ring 4. Arc-shaped frames 9 are welded to both ends of the roller 11 on the frame 1. The arc-shaped frames 9 are fixed to cable trays 7 by bolts a. A lead screw is installed between the two cable trays 7 along the axial direction of the roller 11, and a lead screw sprocket 8 is installed on the lead screw. A brake disc brake device 12 is installed on the frame 1 near the large gear ring 4. The brake disc brake device 12 clamps the outside of the large gear ring 4 to achieve braking. The system also includes a hydraulic control system, which is connected to the motor 13, the tension devices 3, and the brake disc brake device 12. The arc-shaped frame 9 has several mounting holes evenly distributed on it, and bolts a are installed in the mounting holes. Guide wheels 10 are also provided on both sides of the arc-shaped frame 9, so that the entire cable laying support 7 can rotate around the central axis of the roller 11, realizing a variable cable exit angle. The cable laying support 7 is equipped with a cable laying sprocket 5 and a clutch sprocket 6. The cable laying sprocket 5 includes sprocket a and sprocket b, and the clutch sprocket 6 includes sprocket c6-2 and sprocket d6-3. The lead screw sprocket 8 includes sprocket e and sprocket f. Sprocket a meshes with the large gear ring 4, sprocket b is connected to sprocket d6-3 through chain a, sprocket c6-2 is connected to sprocket e through chain b, and sprocket f is fixed on the lead screw. The power transmission relationship of the present invention can be seen from the above structure: First, the motor 13 drives the pinion 2 to rotate, the pinion 2 drives the large gear ring 4 to rotate, and the large gear ring 4 drives the drum 11 to rotate, thereby realizing the winch's winding and unwinding function; Second, the rotation of the large gear ring 4 drives the cable sprocket 5 to rotate, and the cable sprocket 5 transmits power to the lead screw sprocket 8 through the clutch sprocket 6, thereby driving the lead screw to rotate.

[0033] The structure of the tension device in the dual tension protection winch of the underwater blowout preventer of this invention is as follows: Figure 3 and Figure 4 As shown, the tension device 3 includes an upper bracket 3-1 and a lower bracket 3-6. One end of the upper bracket 3-1 is equipped with an upper clamping plate and a lower clamping plate, and the other end of the upper bracket 3-1 is fixed to one end of the lower bracket 3-6 by screws. A large gear ring 4 is positioned between the upper and lower clamping plates. The pressure plate 3-2, friction block mounting plate 3-3, and friction block 3-4 are symmetrically fixed to the upper clamping plate and the large gear ring 4, and to the lower clamping plate and the large gear ring 4, respectively, by screws. A tension cylinder 3-5 is mounted on the side of the lower clamping plate away from the fixed pressure plate 3-2. During normal operation, the tension cylinder 3-5 applies a thrust to the pressure plate 3-2, the friction block 3-4 clamps the large gear ring 4, and the pinion 2 drives the large gear ring 4 to rotate. The tension device 3 is fixed to the side plate of the drum 11, thereby driving the drum 11 to rotate and enabling the winch to wind and unwind the cable. The lower bracket 3-6 is L-shaped, and the other end of the lower bracket 3-6 is fixed to the drum 11 by screws. An adjusting shim 3-7 is also provided between the lower bracket 3-6 and the drum 11.

[0034] The underwater blowout preventer of this invention utilizes a dual tension protection winch with a tension cylinder structure, as shown in the example... Figure 5 As shown, the tension cylinder 3-5 includes a cylinder body 3-5.1 and a push rod 3-5.2. The push rod 3-5.2 is fitted inside one end of the cylinder body 3-5.1, and the other end of the cylinder body 3-5.1 is connected to the pressure cap 3-5.4 by a thread. The push rod 3-5.2 and the pressure cap 3-5.4 are in contact, and a spring 3-5.3 is provided between the push rod 3-5.2 and the pressure cap 3-5.4. The cylinder body 3-5.1 has a control oil port 3-5.5 arranged radially, and the pressure cap 3-5.4 is also provided with a scale. During operation, the upper chamber of push rod 3-5.2 is connected to control oil port 3-5.5, and spring I3-5.3 is installed in the lower chamber of push rod 3-5.2. The upper end of push rod 3-5.2 is in contact with pressure plate 3-2. Pressure cap 3-5.4 has external threads and scales. It is screwed into cylinder body 3-5.1 and spring I3-5.3 is pressed. The clamping force of friction block 3-4 on large gear ring 4 is controlled by adjusting the screwing depth of the threads. By supplying pressure oil to control oil port 3-5.5, push rod 3-5.2 is forced to move downward. The upper end of push rod 3-5.2 leaves pressure plate 3-2, releasing the clamping force of friction block 3-4 on large gear ring 4, cutting off the power transmission between drum 11 and large gear ring 4, realizing the clutch function, and the winch can rotate freely.

[0035] The clamping force of friction block 3-4 on large gear ring 4 is calculated based on the stiffness and compression length of spring I3-5.3. The torque of roller 11 can be calculated based on the clamping force, friction coefficient and distance of tension device 3 from the center of roller 11. Thus, the cable tension is obtained. By adjusting the screw-in depth of pressure cap 3-5.4, the tension is made equal to the maximum load-bearing capacity of the cable. If the hydraulic control system fails or malfunctions, and the actual tension is greater than the maximum load-bearing capacity of the cable, relative slippage will occur between friction block 3-4 and large gear ring 4, resulting in slippage and thus preventing the cable from being pulled apart.

[0036] Example 3

[0037] The underwater blowout preventer of this invention uses a dual tension protection winch, such as... Figure 1 and Figure 2As shown, the system includes a frame 1, on which a roller 11 is mounted. Several sets of tension devices 3 are evenly distributed and fixed at one end of the roller 11, and the other end of the tension devices 3 clamps a large gear ring 4. A motor 13 is fixed to the frame 1 near the large gear ring 4. A pinion 2 is installed on the output shaft of the motor 13, and the pinion 2 meshes with the large gear ring 4. Arc-shaped frames 9 are welded to both ends of the roller 11 on the frame 1. The arc-shaped frames 9 are fixed to cable trays 7 by bolts a. A lead screw is installed between the two cable trays 7 along the axial direction of the roller 11, and a lead screw sprocket 8 is installed on the lead screw. A brake disc brake device 12 is installed on the frame 1 near the large gear ring 4. The brake disc brake device 12 clamps the outside of the large gear ring 4 to achieve braking. The system also includes a hydraulic control system, which is connected to the motor 13, the tension devices 3, and the brake disc brake device 12. The arc-shaped frame 9 has several mounting holes evenly distributed on it, and bolts a are installed in the mounting holes. Guide wheels 10 are also provided on both sides of the arc-shaped frame 9, so that the entire cable laying support 7 can rotate around the central axis of the roller 11, realizing a variable cable exit angle. The cable laying support 7 is equipped with a cable laying sprocket 5 and a clutch sprocket 6. The cable laying sprocket 5 includes sprocket a and sprocket b, and the clutch sprocket 6 includes sprocket c6-2 and sprocket d6-3. The lead screw sprocket 8 includes sprocket e and sprocket f. Sprocket a meshes with the large gear ring 4, sprocket b is connected to sprocket d6-3 through chain a, sprocket c6-2 is connected to sprocket e through chain b, and sprocket f is fixed on the lead screw. The power transmission relationship of the present invention can be seen from the above structure: First, the motor 13 drives the pinion 2 to rotate, the pinion 2 drives the large gear ring 4 to rotate, and the large gear ring 4 drives the drum 11 to rotate, thereby realizing the winch's winding and unwinding function; Second, the rotation of the large gear ring 4 drives the cable sprocket 5 to rotate, and the cable sprocket 5 transmits power to the lead screw sprocket 8 through the clutch sprocket 6, thereby driving the lead screw to rotate.

[0038] The structure of the tension device in the dual tension protection winch of the underwater blowout preventer of this invention is as follows: Figure 3 and Figure 4 As shown, the tension device 3 includes an upper bracket 3-1 and a lower bracket 3-6. One end of the upper bracket 3-1 is equipped with an upper clamping plate and a lower clamping plate, and the other end of the upper bracket 3-1 is fixed to one end of the lower bracket 3-6 by screws. A large gear ring 4 is positioned between the upper and lower clamping plates. The pressure plate 3-2, friction block mounting plate 3-3, and friction block 3-4 are symmetrically fixed to the upper clamping plate and the large gear ring 4, and to the lower clamping plate and the large gear ring 4, respectively, by screws. A tension cylinder 3-5 is mounted on the side of the lower clamping plate away from the fixed pressure plate 3-2. During normal operation, the tension cylinder 3-5 applies a thrust to the pressure plate 3-2, the friction block 3-4 clamps the large gear ring 4, and the pinion 2 drives the large gear ring 4 to rotate. The tension device 3 is fixed to the side plate of the drum 11, thereby driving the drum 11 to rotate and enabling the winch to wind and unwind the cable. The lower bracket 3-6 is L-shaped, and the other end of the lower bracket 3-6 is fixed to the drum 11 by screws. An adjusting shim 3-7 is also provided between the lower bracket 3-6 and the drum 11.

[0039] The underwater blowout preventer of this invention utilizes a dual tension protection winch with a tension cylinder structure, as shown in the example... Figure 5 As shown, the tension cylinder 3-5 includes a cylinder body 3-5.1 and a push rod 3-5.2. The push rod 3-5.2 is fitted inside one end of the cylinder body 3-5.1, and the other end of the cylinder body 3-5.1 is connected to the pressure cap 3-5.4 by a thread. The push rod 3-5.2 and the pressure cap 3-5.4 are in contact, and a spring 3-5.3 is provided between the push rod 3-5.2 and the pressure cap 3-5.4. The cylinder body 3-5.1 has a control oil port 3-5.5 arranged radially, and the pressure cap 3-5.4 is also provided with a scale. During operation, the upper chamber of push rod 3-5.2 is connected to control oil port 3-5.5, and spring I3-5.3 is installed in the lower chamber of push rod 3-5.2. The upper end of push rod 3-5.2 is in contact with pressure plate 3-2. Pressure cap 3-5.4 has external threads and scales. It is screwed into cylinder body 3-5.1 and spring I3-5.3 is pressed. The clamping force of friction block 3-4 on large gear ring 4 is controlled by adjusting the screwing depth of the threads. By supplying pressure oil to control oil port 3-5.5, push rod 3-5.2 is forced to move downward. The upper end of push rod 3-5.2 leaves pressure plate 3-2, releasing the clamping force of friction block 3-4 on large gear ring 4, cutting off the power transmission between drum 11 and large gear ring 4, realizing the clutch function, and the winch can rotate freely.

[0040] The clamping force of friction block 3-4 on large gear ring 4 is calculated based on the stiffness and compression length of spring I3-5.3. The torque of roller 11 can be calculated based on the clamping force, friction coefficient and distance of tension device 3 from the center of roller 11. Thus, the cable tension is obtained. By adjusting the screw-in depth of pressure cap 3-5.4, the tension is made equal to the maximum load-bearing capacity of the cable. If the hydraulic control system fails or malfunctions, and the actual tension is greater than the maximum load-bearing capacity of the cable, relative slippage will occur between friction block 3-4 and large gear ring 4, resulting in slippage and thus preventing the cable from being pulled apart.

[0041] The present invention relates to the structure of the clutch sprocket in the underwater blowout preventer using a dual tension protection winch, as shown in... Figure 6 As shown, the clutch sprocket 6 includes a rotating shaft 6-1, on which a sprocket c6-2, a copper sleeve 6-5, and a handwheel 6-9 are sequentially mounted. A sprocket d6-3 is mounted on one end of the copper sleeve 6-5 and the handwheel 6-9. A support seat 6-4 is mounted on the end of the sprocket d6-3 near the handwheel 6-9. The support seat 6-4 is fixed to the cable tray bracket 7 by screws.

[0042] A steel ball 6-6 is provided between the support base 6-4 and the sprocket d6-3. The support base 6-4 is provided with a pressure block 6-8 and a locking block 6-7 along the radial direction of the steel ball 6-6 to prevent the steel ball 6-6 from slipping out. The handwheel 6-9 is provided with a spring II 6-11 and a retaining ring 6-10 at the end away from the sprocket d6-3. The handwheel 6-9 is limited by the retaining ring 6-10. The spring II 6-11 ensures that it does not come out during normal operation. The retaining ring 6-10 limits the clutch disengagement position to prevent the handwheel 6-9 from being pulled out when the clutch is switched.

[0043] Under normal working conditions, it plays the role of transmitting power for cable laying. However, due to deviations in the cable reversal position on both sides of the drum and the cable diameter from the theoretical value, cumulative errors occur after a period of operation. This leads to positional deviations between the cable exit point and the cable position on the drum, thus affecting the cable laying effect. It is necessary to move handwheel 6-9 to the right to disengage it from sprocket d6-3, cutting off the power transmission between sprocket c6-2 and sprocket d6-3. At this time, rotating handwheel 6-9 can adjust the position of the cable exit point independently. Once the cable exit point and the cable position on the drum are matched, stop and push handwheel 6-9 to the left to restore power transmission and resume normal operation.

[0044] The schematic diagram of the hydraulic control system in the dual tension protection winch of the underwater blowout preventer of this invention is as follows: Figure 7 As shown, the hydraulic control system includes a proportional directional valve 15. One end of the proportional directional valve 15 is connected to the motor 13 via a tension control valve 14, and the other end of the proportional directional valve 15 is connected to the disc brake control valve 17 and the free-release control valve 18 via a pressure reducing valve 16. The oil outlet of the disc brake control valve 17 is connected to the brake disc brake device 12, and the oil outlet of the free-release control valve 18 is connected to the control oil port 3-5.5 on the tension device 3.

[0045] The hydraulic control system is equipped with a tension control valve 14. By adjusting the valve parameters, the pressure is controlled to achieve the control of cable tension. When the tension is greater than the set value, the cable is released; when it is less than the set value, the cable is retrieved. The set value is less than the maximum load-bearing capacity of the cable. Under normal working conditions, the tension control valve 14 controls and protects the cable tension. If the tension control valve 14 or the hydraulic control system fails, the tension device 3 can provide mechanical protection to prevent cable damage.

[0046] The underwater blowout preventer using a dual tension protection winch of this invention operates as follows:

[0047] During normal cable handling, the pinion 2 drives the large gear ring 4, which in turn drives the cable-laying sprocket 5. Power is transmitted to the lead screw sprocket 8 via the clutch sprocket 6, driving the lead screw to rotate and thus the cable-laying device operates. Simultaneously, several tension devices 3 are installed between the large gear ring 4 and the drum 11. The rotation of the large gear ring 4 drives the drum 11, thereby enabling the winch to handle cable handling. The large gear ring 4 is braked by the disc brake device 12. The large gear ring 4 simultaneously participates in the drum drive, cable-laying drive, and winch braking. The cable-laying sprocket 5 and the clutch sprocket 6 are mounted on the cable-laying bracket 7, which is fixed to the arc-shaped frame 9. The arc-shaped frame 9 has several evenly distributed mounting holes, allowing the entire cable-laying device to rotate around the central axis of the drum 11, achieving a variable cable exit angle. Because the guide wheel positions differ on different platforms, the relative positions of the winch and guide wheels also differ, resulting in different cable exit angles. A variable cable exit angle makes it suitable for different platforms.

[0048] During normal operation, the cable sprocket 5 drives the sprocket d6-3 to rotate via chain a. The handwheel 6-9 is in the left engagement position. The sprocket d6-3 drives the handwheel 6-9 to rotate, which in turn drives the rotating shaft 6-1 to rotate. The rotating shaft 6-1 then drives the sprocket c6-2 to rotate. Since c6-2 is connected to the lead screw sprocket 8 via chain b, the power is ultimately transmitted to the lead screw. When a cable routing deviation occurs, pushing the handwheel 6-9 to the right disengages the handwheel 6-9 from the sprocket d6-3, allowing the lead screw to be adjusted independently to eliminate the deviation.

[0049] The winch provides dual tension protection for the cable. Under normal operation, the hydraulic control system is equipped with a tension control valve 14, which controls the cable tension. The drum 11 rotates forward and backward to maintain a constant tension. However, if the hydraulic control system or the tension control valve 14 fails or malfunctions, the second layer of mechanical tension protection will intervene. The compression of the spring in the tension device 3 controls the clamping force of the friction block 3-4. If the clamping force exceeds the cable's bearing capacity, slippage will occur, preventing the cable from being pulled apart.

Claims

1. A winch with dual tension protection for underwater blowout preventers, characterized in that, The system includes a frame (1), on which a roller (11) is mounted. Several sets of tension devices (3) are evenly distributed and fixed at one end of the roller (11), and the other end of the tension devices (3) clamps a large gear ring (4). A motor (13) is fixed on the frame (1) near the large gear ring (4). A pinion (2) is provided on the output shaft of the motor (13), and the pinion (2) meshes with the large gear ring (4). Arc-shaped frames (9) are welded to both ends of the roller (11) on the frame (1), and the arc-shaped frames (9) are fixed by bolts a. Cable support (7), a lead screw is installed between the two cable support (7) along the axial direction of the roller (11), and a lead screw sprocket (8) is provided on the lead screw; a brake disc brake device (12) is installed on the frame (1) near the large gear ring (4); a hydraulic control system is also included, which is connected to the motor (13), tension device (3) and brake disc brake device (12) respectively, and a number of mounting holes are evenly opened on the arc frame (9), and the bolt a is set in the mounting hole. Guide wheels are also provided on both sides of the arc frame (9). 10), the cable tray support (7) is equipped with a cable tray sprocket (5) and a clutch sprocket (6). The cable tray sprocket (5) includes sprocket a and sprocket b. The clutch sprocket (6) includes sprocket c (6-2) and sprocket d (6-3). The screw sprocket (8) includes sprocket e and sprocket f. Sprocket a meshes with the large gear ring (4). Sprocket b is connected to sprocket d (6-3) via chain a. Sprocket c (6-2) is connected to sprocket e via chain b. Sprocket f is fixed to the screw. The tension device (3) includes The upper bracket (3-1) and the lower bracket (3-6) are provided with an upper clamping plate and a lower clamping plate at one end of the upper bracket (3-1) and the other end of the upper bracket (3-1) is fixed to one end of the lower bracket (3-6) by screws; the large gear ring (4) is provided between the upper clamping plate and the lower clamping plate, and the pressure plate (3-2), the friction block mounting plate (3-3) and the friction block (3-4) are symmetrically fixed between the upper clamping plate and the large gear ring (4) and between the lower clamping plate and the large gear ring (4) by screws in sequence; the tension cylinder (3-5) is installed on the side of the lower clamping plate away from the fixed pressure plate (3-2).

2. The protective winch according to claim 1, characterized in that, The clutch sprocket (6) includes a rotating shaft (6-1), on which a sprocket c (6-2), a copper sleeve (6-5), and a handwheel (6-9) are sequentially mounted. A sprocket d (6-3) is mounted on one end of the copper sleeve (6-5) and the handwheel (6-9). A support seat (6-4) is mounted on the end of the sprocket d (6-3) near the handwheel (6-9). The support seat (6-4) is fixed to the cable tray bracket (7) by screws.

3. The protective winch according to claim 2, characterized in that, A steel ball (6-6) is provided between the support base (6-4) and the sprocket d (6-3). The support base (6-4) is provided with a pressure block (6-8) and a locking block (6-7) radially at the steel ball (6-6). The handwheel (6-9) is provided with a spring II (6-11) and a retaining ring (6-10) at the end away from the sprocket d (6-3). The handwheel (6-9) is limited by the retaining ring (6-10).

4. The protective winch according to claim 1, characterized in that, The lower support (3-6) is L-shaped, and the other end of the lower support (3-6) is fixed to the roller (11) by screws. An adjusting shim (3-7) is also provided between the lower support (3-6) and the roller (11).

5. The protective winch according to claim 1, characterized in that, The tension cylinder (3-5) includes a cylinder body (3-5.1) and a push rod (3-5.2). The push rod (3-5.2) is fitted inside one end of the cylinder body (3-5.1), and the other end of the cylinder body (3-5.1) is connected to the pressure cap (3-5.4) by a thread. The push rod (3-5.2) and the pressure cap (3-5.4) are in contact, and a spring I (3-5.3) is provided between the push rod (3-5.2) and the pressure cap (3-5.4).

6. The protective winch according to claim 5, characterized in that, The cylinder body (3-5.1) is provided with a control oil port (3-5.5) in the radial direction, and the pressure cap (3-5.4) is also provided with a scale.

7. The protective winch according to claim 1, characterized in that, The hydraulic control system includes a proportional directional valve (15). One end of the proportional directional valve (15) is connected to the motor (13) through a tension control valve (14). The other end of the proportional directional valve (15) is connected to the disc brake control valve (17) and the free-release control valve (18) through a pressure reducing valve (16). The oil outlet of the disc brake control valve (17) is connected to the brake disc brake device (12), and the oil outlet of the free-release control valve (18) is connected to the tension device (3).

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