Double tension protection winch for underwater blowout preventer

Abstract

The double tension protection winch for the underwater blowout preventer comprises a rack, a roller is installed on the rack, a plurality of sets of tension devices are evenly distributed and fixed to one end of the roller, and a large gear ring is clamped by the other ends of the multiple sets of tension devices; a motor is fixed to the position, close to the large gear ring, of the rack, and a small gear is arranged on an output shaft of the motor and meshed with the large gear ring. Arc-shaped frames are welded to the positions, at the two ends of the roller, of the rack respectively, cable arrangement supports are fixed to the arc-shaped frames through bolts a, a lead screw is installed between the two cable arrangement supports in the axial direction of the roller, and a lead screw chain wheel is arranged on the lead screw; the rack is provided with a brake disc brake device close to the large gear ring; and the hydraulic control system is respectively connected with the motor, the tension device and the brake disc brake device. According to the double tension protection winch for the underwater blowout preventer, the tension device and the hydraulic control system are arranged for double tension protection, an umbilical cable is prevented from being snapped, the cable arrangement device is designed to be in a rotatable mode, and the universality of the winch is improved.

Description

Technical Field

[0001] The invention belongs to the technical field of marine oil and gas equipment and relates to a double tension protection winch for an underwater blowout preventer. Background Art

[0002] The control system of the underwater blowout preventer is installed on the drilling platform or ship and connected to the underwater blowout preventer through an umbilical cable. The umbilical cable is wrapped around a winch, and the winch is operated to retract and release the umbilical cable. When the blowout preventer is lowered or recovered, the umbilical cable is also lowered or recovered with the blowout preventer. At the same time, the blowout preventer is connected to the riser. The underwater working state is that the umbilical cable is in a constant tension control mode. The riser is affected by the ocean current, wind and waves on the water and will produce a certain movement. The winch needs to retract and release according to the tension of the umbilical cable to prevent the umbilical cable from being broken. The umbilical cable is a multi-core cable and is expensive. In addition, damage to the umbilical cable will cause the blowout preventer control to fail. If a blowout occurs, the wellhead cannot be closed.

[0003] Therefore, the BOP winch needs to have multiple functions. Conventional winches are equipped with special mechanisms for cable arrangement, constant tension, gear drive, clutch and other functions. They have many structural components, occupy a large space for winch installation, and are not compact enough. In addition, the tension control is achieved by a constant tension control valve, and the constant tension is adjusted by setting the pressure. If the control valve or control system fails, the tension is not controlled, the riser moves, and the umbilical cable is pulled back, and there is a risk that the umbilical cable will be broken. In addition, the rope output angle of the traditional winch cable arrangement device is determined according to the position of the guide pulley. The structure of each platform or ship is different, and the position of the winch and guide pulley is also different. The BOP winch is a special design, and each platform must design a new cable arrangement device, which is not flexible enough and does not have universality. Summary of the invention

[0004] The purpose of the present invention is to provide a double tension protection winch for an underwater blowout preventer, so as to solve the problems of the existing winch having a complex and non-compact structure, an umbilical cable being easily broken and having poor versatility.

[0005] The technical solution adopted by the present invention is that a double tension protection winch for an underwater blowout preventer includes a frame, a drum is installed on the frame, a plurality of groups of tension devices are evenly fixed on one end of the drum, and a large gear ring is clamped at the other end of the plurality of groups of tension devices; a motor is fixed to the frame near the large gear ring, a small gear is arranged on the output shaft of the motor, and the small gear is meshed with the large gear ring; arc frames are respectively welded to the frame at both ends of the drum, the arc frames are fixed to the cable arrangement bracket by bolts a, a lead screw is installed between the two cable arrangement brackets along the axial direction of the drum, and a lead screw sprocket is arranged on the lead screw; a brake disc brake device is installed on the frame near the large gear ring; and a hydraulic control system is also included, and the hydraulic control system is respectively connected to the motor, the tension device and the brake disc brake device.

[0006] The present invention is also characterized in that:

[0007] A plurality of mounting holes are evenly arranged on the arc frame, bolts a are arranged in the mounting holes, and guide wheels are also arranged on both sides of the arc frame.

[0008] A cable sprocket and a clutch sprocket are installed on the cable bracket. The cable sprocket includes sprocket a and sprocket b, the clutch sprocket includes sprocket c and sprocket d, and the lead screw sprocket includes sprocket e and sprocket f; sprocket a is meshed with the large gear ring, sprocket b is connected with sprocket d through chain a, sprocket c is connected with sprocket e through 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 arranged, a sprocket d is arranged on one end of the copper sleeve and the handwheel, and a sprocket d is arranged on a support seat at the end close to the handwheel, and the support seat is fixed to the cable bracket by screws.

[0010] A steel ball is arranged between the support seat and the sprocket d, and a pressure block and a locking block are arranged along the radial direction of the steel ball at the support seat; a spring II and a retaining ring are arranged at the end of the handwheel away from the sprocket d, and the handwheel is limited by the retaining ring.

[0011] The tension device includes an upper bracket and a lower bracket, one end of the upper bracket is provided with an upper clamping plate and a lower clamping plate, and the other end of the upper bracket is fixed to one end of the lower bracket by screws; a large gear ring is arranged between the upper clamping plate and the lower clamping plate, and the upper clamping plate and the large gear ring, the lower clamping plate and the large gear ring are symmetrically fixed with screws in turn, and a tension cylinder is installed on the side of the lower clamping plate away from the fixed pressure plate.

[0012] The lower bracket is L-shaped, and the other end of the lower bracket is fixed to the drum by screws, and an adjusting gasket is arranged between the lower bracket and the drum.

[0013] The tension cylinder comprises a cylinder body and a push rod, wherein the push rod is sleeved inside one end of the cylinder body, and the other end of the cylinder body is connected to the gland through a thread, the push rod is in contact with the gland, and a spring I is arranged between the push rod and the gland.

[0014] The cylinder body is provided with control oil ports along the radial direction, and the gland is also provided with scales.

[0015] The hydraulic control system includes a proportional reversing valve, one end of which is connected to the motor through a tension control valve, and the other end of which is connected to a disc brake control valve and a free lowering control valve through a pressure reducing valve, respectively. The oil outlet of the disc brake control valve is connected to a brake disc brake device, and the oil outlet of the free lowering control valve is connected to a tension device.

[0016] The beneficial effects of the present invention are:

[0017] (1) The double tension protection winch for the underwater blowout preventer of the present invention integrates a driving device, a cable arrangement device, a brake, a clutch, and a tension protection device into an integral structure, thereby reducing the number of unit devices, having a compact structure, and a high degree of integration.

[0018] (2) The double tension protection winch for the underwater blowout preventer of the present invention has a double tension protection function for the umbilical cable and is provided with a tension device. When the hydraulic control system fails or malfunctions, the tension device is started to ensure that the umbilical cable is normally stressed by sliding the friction block, thereby preventing the umbilical cable from being broken.

[0019] (3) The underwater blowout preventer of the present invention uses a double tension protection winch. The entire cable arrangement device is designed to be rotatable and is fixed to the frame by bolts a. A guide wheel is provided and can rotate around the center of the drum. The cable output angle can be adjusted as needed to meet the installation requirements of different platforms or ships. BRIEF DESCRIPTION OF THE DRAWINGS

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

[0021] Figure 2 It is a right side view of the double tension protection winch for the underwater blowout preventer of the present invention;

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

[0023] Figure 4 It is a front view of the tension device in the protective winch of the present invention;

[0024] Figure 5 is a cross-sectional view of a tension cylinder in a protective winch of the present invention;

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

[0026] Figure 7 It is a schematic diagram of the hydraulic control system in the protection winch of the present invention.

[0027] In the figure, 1. frame, 2. small gear, 3. tension device, 3-1. upper bracket, 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. gland, 3-5.5. control oil port, 3-6. lower bracket, 3-7. adjustment gasket, 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 bracket, 8. Screw sprocket, 9. Arc frame, 10. Guide wheel, 11. Drum, 12. Brake disc brake device, 13. Motor, 14. Tension control valve, 15. Proportional reversing valve, 16. Pressure reducing valve, 17. Disc brake control valve, 18. Free lowering control valve. DETAILED DESCRIPTION

[0028] The present invention is described in detail below with reference to the accompanying drawings and specific embodiments.

[0029] Example 1

[0030] The underwater blowout preventer of the present invention uses a double tension protection winch, such as Figure 1 and Figure 2As shown, the frame 1 includes a drum 11, on which a plurality of tension devices 3 are evenly fixed at one end of the drum 11, and the other ends of the plurality of tension devices 3 clamp a large gear ring 4; a motor 13 is fixed to the frame 1 near the large gear ring 4, and a pinion 2 is arranged on the output shaft of the motor 13, and the pinion 2 meshes with the large gear ring 4; arc frames 9 are respectively welded to the two ends of the drum 11 of the frame 1, and the arc frames 9 are fixed to the cable arrangement bracket 7 by bolts a, and a lead screw is installed between the two cable arrangement brackets 7 along the axial direction of the drum 11, and a lead screw sprocket 8 is arranged on the lead screw; a brake disc brake device 12 is installed near the large gear ring 4 of the frame 1, and the brake disc brake device 12 clamps the outer side of the large gear ring 4 to achieve braking; and a hydraulic control system is also included, and the hydraulic control system is respectively connected to the motor 13, the tension device 3 and the brake disc brake device 12. Several mounting holes are evenly arranged on the arc frame 9, and bolts a are arranged in the mounting holes. Guide wheels 10 are also arranged on both sides of the arc frame 9, so that the entire cable arrangement bracket 7 can rotate around the central axis of the drum 11 to achieve a variable cable output angle. A cable arrangement sprocket 5 and a clutch sprocket 6 are installed on the cable arrangement bracket 7. The cable arrangement sprocket 5 includes sprocket a and sprocket b, the clutch sprocket 6 includes sprocket c6-2 and sprocket d6-3, and the lead screw sprocket 8 includes sprocket e and sprocket f; sprocket a is meshed 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: 1. The motor 13 drives the small gear 2 to rotate, the small gear 2 drives the large ring gear 4 to rotate, and the large ring gear 4 drives the drum 11 to rotate, thereby realizing the winch retracting and releasing function; 2. The rotation of the large ring gear 4 drives the cable sprocket 5 to rotate, and the cable sprocket 5 transmits power to the screw sprocket 8 through the clutch sprocket 6, thereby driving the screw to rotate.

[0031] Example 2

[0032] The underwater blowout preventer of the present invention uses a double tension protection winch, such as Figure 1 and Figure 2As shown, the frame 1 includes a drum 11, on which a plurality of tension devices 3 are evenly fixed at one end of the drum 11, and the other ends of the plurality of tension devices 3 clamp a large gear ring 4; a motor 13 is fixed to the frame 1 near the large gear ring 4, and a pinion 2 is arranged on the output shaft of the motor 13, and the pinion 2 meshes with the large gear ring 4; arc frames 9 are respectively welded to the two ends of the drum 11 of the frame 1, and the arc frames 9 are fixed to the cable arrangement bracket 7 by bolts a, and a lead screw is installed between the two cable arrangement brackets 7 along the axial direction of the drum 11, and a lead screw sprocket 8 is arranged on the lead screw; a brake disc brake device 12 is installed near the large gear ring 4 of the frame 1, and the brake disc brake device 12 clamps the outer side of the large gear ring 4 to achieve braking; and a hydraulic control system is also included, and the hydraulic control system is respectively connected to the motor 13, the tension device 3 and the brake disc brake device 12. Several mounting holes are evenly arranged on the arc frame 9, and bolts a are arranged in the mounting holes. Guide wheels 10 are also arranged on both sides of the arc frame 9, so that the entire cable arrangement bracket 7 can rotate around the central axis of the drum 11 to achieve a variable cable output angle. A cable arrangement sprocket 5 and a clutch sprocket 6 are installed on the cable arrangement bracket 7. The cable arrangement sprocket 5 includes sprocket a and sprocket b, the clutch sprocket 6 includes sprocket c6-2 and sprocket d6-3, and the lead screw sprocket 8 includes sprocket e and sprocket f; sprocket a is meshed 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: 1. The motor 13 drives the small gear 2 to rotate, the small gear 2 drives the large ring gear 4 to rotate, and the large ring gear 4 drives the drum 11 to rotate, thereby realizing the winch retracting and releasing function; 2. The rotation of the large ring gear 4 drives the cable sprocket 5 to rotate, and the cable sprocket 5 transmits power to the screw sprocket 8 through the clutch sprocket 6, thereby driving the screw to rotate.

[0033] The structure of the tension device in the double tension protection winch of the underwater blowout preventer of the present 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 provided 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; the large gear ring 4 is arranged between the upper clamping plate and the lower clamping plate, and the upper clamping plate and the large gear ring 4, the lower clamping plate and the large gear ring 4 are symmetrically fixed to the pressure plate 3-2, the friction block mounting plate 3-3 and the friction block 3-4 by screws in turn, and the tension cylinder 3-5 is installed 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 thrust to the pressure plate 3-2, the friction block 3-4 clamps the large gear ring 4, the pinion 2 drives the large gear ring 4 to rotate, and the tension device 3 is fixed to the side plate of the drum 11, thereby driving the drum 11 to rotate, so as to realize the winch cable retracting and releasing. 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, and an adjustment gasket 3-7 is also arranged between the lower bracket 3-6 and the drum 11.

[0034] The underwater blowout preventer of the present invention uses a double tension protection winch structure of the tension cylinder, such as 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 sleeved at one end of the cylinder body 3-5.1, and the other end of the cylinder body 3-5.1 is connected to the gland 3-5.4 through a thread. The push rod 3-5.2 and the gland 3-5.4 are in contact, and a spring 13-5.3 is arranged between the push rod 3-5.2 and the gland 3-5.4. The cylinder body 3-5.1 is provided with a control oil port 3-5.5 in the radial direction, and the gland 3-5.4 is also provided with a scale. During operation, the upper cavity of the push rod 3-5.2 is connected with the control oil port 3-5.5, and the lower cavity of the push rod 3-5.2 is installed with a spring I3-5.3. The upper end of the push rod 3-5.2 contacts the pressure plate 3-2. The pressure cover 3-5.4 has external threads and scales, which are screwed into the cylinder body 3-5.1 and compress the spring I3-5.3. The clamping force of the friction block 3-4 on the large gear ring 4 is controlled by adjusting the screw-in depth of the thread. By supplying pressure oil to the control oil port 3-5.5, the push rod 3-5.2 is forced to move downward, and the upper end of the push rod 3-5.2 leaves the pressure plate 3-2, releasing the clamping force of the friction block 3-4 on the large gear ring 4, cutting off the power transmission between the drum 11 and the large gear ring 4, realizing the clutch function, and the winch can rotate freely.

[0035] The clamping force of the friction block 3-4 on the large gear ring 4 is calculated according to the stiffness and compression length of the spring I3-5.3. The torque of the drum 11 can be calculated according to the clamping force, friction coefficient and the distance between the tension device 3 and the center of the drum 11, thereby obtaining the tension of the cable. The tension is equal to the maximum load-bearing capacity of the cable by adjusting the screwing depth of the gland 3-5.4. If the hydraulic control system fails or malfunctions, and the actual tension is greater than the maximum load-bearing capacity of the cable, relative slip occurs between the friction block 3-4 and the large gear ring 4, resulting in a slipping scene, thereby preventing the cable from being broken.

[0036] Example 3

[0037] The underwater blowout preventer of the present invention uses a double tension protection winch, such as Figure 1 and Figure 2As shown, the frame 1 includes a drum 11, on which a plurality of tension devices 3 are evenly fixed at one end of the drum 11, and the other ends of the plurality of tension devices 3 clamp a large gear ring 4; a motor 13 is fixed to the frame 1 near the large gear ring 4, and a pinion 2 is arranged on the output shaft of the motor 13, and the pinion 2 meshes with the large gear ring 4; arc frames 9 are respectively welded to the two ends of the drum 11 of the frame 1, and the arc frames 9 are fixed to the cable arrangement bracket 7 by bolts a, and a lead screw is installed between the two cable arrangement brackets 7 along the axial direction of the drum 11, and a lead screw sprocket 8 is arranged on the lead screw; a brake disc brake device 12 is installed near the large gear ring 4 of the frame 1, and the brake disc brake device 12 clamps the outer side of the large gear ring 4 to achieve braking; and a hydraulic control system is also included, and the hydraulic control system is respectively connected to the motor 13, the tension device 3 and the brake disc brake device 12. Several mounting holes are evenly arranged on the arc frame 9, and bolts a are arranged in the mounting holes. Guide wheels 10 are also arranged on both sides of the arc frame 9, so that the entire cable arrangement bracket 7 can rotate around the central axis of the drum 11 to achieve a variable cable output angle. A cable arrangement sprocket 5 and a clutch sprocket 6 are installed on the cable arrangement bracket 7. The cable arrangement sprocket 5 includes sprocket a and sprocket b, the clutch sprocket 6 includes sprocket c6-2 and sprocket d6-3, and the lead screw sprocket 8 includes sprocket e and sprocket f; sprocket a is meshed 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: 1. The motor 13 drives the small gear 2 to rotate, the small gear 2 drives the large ring gear 4 to rotate, and the large ring gear 4 drives the drum 11 to rotate, thereby realizing the winch retracting and releasing function; 2. The rotation of the large ring gear 4 drives the cable sprocket 5 to rotate, and the cable sprocket 5 transmits power to the screw sprocket 8 through the clutch sprocket 6, thereby driving the screw to rotate.

[0038] The structure of the tension device in the double tension protection winch of the underwater blowout preventer of the present 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 provided 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; the large gear ring 4 is arranged between the upper clamping plate and the lower clamping plate, and the upper clamping plate and the large gear ring 4, the lower clamping plate and the large gear ring 4 are symmetrically fixed to the pressure plate 3-2, the friction block mounting plate 3-3 and the friction block 3-4 by screws in turn, and the tension cylinder 3-5 is installed 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 thrust to the pressure plate 3-2, the friction block 3-4 clamps the large gear ring 4, the pinion 2 drives the large gear ring 4 to rotate, and the tension device 3 is fixed to the side plate of the drum 11, thereby driving the drum 11 to rotate, so as to realize the winch cable retracting and releasing. 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, and an adjustment gasket 3-7 is also arranged between the lower bracket 3-6 and the drum 11.

[0039] The underwater blowout preventer of the present invention uses a double tension protection winch structure of the tension cylinder, such as 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 sleeved at one end of the cylinder body 3-5.1, and the other end of the cylinder body 3-5.1 is connected to the gland 3-5.4 through a thread. The push rod 3-5.2 and the gland 3-5.4 are in contact, and a spring 13-5.3 is arranged between the push rod 3-5.2 and the gland 3-5.4. The cylinder body 3-5.1 is provided with a control oil port 3-5.5 in the radial direction, and the gland 3-5.4 is also provided with a scale. During operation, the upper cavity of the push rod 3-5.2 is connected with the control oil port 3-5.5, and the lower cavity of the push rod 3-5.2 is installed with a spring I3-5.3. The upper end of the push rod 3-5.2 contacts the pressure plate 3-2. The pressure cover 3-5.4 has external threads and scales, which are screwed into the cylinder body 3-5.1 and compress the spring I3-5.3. The clamping force of the friction block 3-4 on the large gear ring 4 is controlled by adjusting the screw-in depth of the thread. By supplying pressure oil to the control oil port 3-5.5, the push rod 3-5.2 is forced to move downward, and the upper end of the push rod 3-5.2 leaves the pressure plate 3-2, releasing the clamping force of the friction block 3-4 on the large gear ring 4, cutting off the power transmission between the drum 11 and the large gear ring 4, realizing the clutch function, and the winch can rotate freely.

[0040] The clamping force of the friction block 3-4 on the large gear ring 4 is calculated according to the stiffness and compression length of the spring I3-5.3. The torque of the drum 11 can be calculated according to the clamping force, friction coefficient and the distance between the tension device 3 and the center of the drum 11, thereby obtaining the tension of the cable. The tension is equal to the maximum load-bearing capacity of the cable by adjusting the screwing depth of the gland 3-5.4. If the hydraulic control system fails or malfunctions, and the actual tension is greater than the maximum load-bearing capacity of the cable, relative slip occurs between the friction block 3-4 and the large gear ring 4, resulting in a slipping scene, thereby preventing the cable from being broken.

[0041] The underwater blowout preventer of the present invention uses a double tension protection winch clutch sprocket structure, such as Figure 6 As shown, the clutch sprocket 6 includes a rotating shaft 6-1, on which the rotating shaft 6-1 is sequentially provided with an outer sprocket c6-2, a copper sleeve 6-5 and a handwheel 6-9, and on one end of the copper sleeve 6-5 and the handwheel 6-9, an outer sprocket d6-3 is provided, and the sprocket d6-3 is provided with an outer support seat 6-4 at the end close to the handwheel 6-9, and the support seat 6-4 is fixed to the cable bracket 7 by screws.

[0042] A steel ball 6-6 is arranged between the support seat 6-4 and the sprocket d6-3. A pressure block 6-8 and a locking block 6-7 are arranged along the radial direction of the steel ball 6-6 on the support seat 6-4 to prevent the steel ball 6-6 from slipping out. A spring II6-11 and a retaining ring 6-10 are arranged at the end of the handwheel 6-9 away from the sprocket d6-3. The handwheel 6-9 is limited by the retaining ring 6-10. The spring II6-11 ensures that it does not fall out during normal operation. The retaining ring 6-10 limits the clutch exit 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 power transmission for cable arrangement. Because the reversing position of the cable on both sides of the drum and the cable diameter deviate from the theoretical value, cumulative errors will appear after working for a period of time. There will be position deviation between the cable outlet point and the cable position on the drum, which will affect the cable arrangement effect. It is necessary to operate the handwheel 6-9 to move right, disengage from the sprocket d6-3, and cut off the power transmission between the sprocket c6-2 and the sprocket d6-3. At this time, the handwheel 6-9 can be turned to adjust the cable outlet position alone. When the cable outlet point and the cable position on the drum match, stop, push the handwheel 6-9 to move left, restore power transmission, and perform normal work.

[0044] The principle diagram of the hydraulic control system in the double tension protection winch for the underwater blowout preventer of the present invention is as follows: Figure 7 As shown, the hydraulic control system includes a proportional reversing valve 15, one end of the proportional reversing valve 15 is connected to the motor 13 through the tension control valve 14, and the other end of the proportional reversing valve 15 is connected to the disc brake control valve 17 and the free lowering control valve 18 through the 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 lowering control valve 18 is connected to the control oil port 3-5.5 on the tension device 3.

[0045] The hydraulic control system is provided with a tension control valve 14, and the pressure is controlled by adjusting the valve parameters to realize the control of the cable tension. When the tension is greater than the set value, the cable is released, and when it is less than the set value, the cable is reeled in. The set value is less than the maximum bearing capacity of the cable. Under normal working conditions, the tension of the cable is controlled and protected by the tension control valve 14. If the tension control valve 14 or the hydraulic control system fails, the tension device 3 can perform mechanical protection to prevent the cable from being damaged.

[0046] The double tension protection winch of the underwater blowout preventer of the present invention has the following working process:

[0047] During normal retracting and releasing conditions, the pinion 2 drives the large gear ring 4, and the large gear ring rotates while driving the cable sprocket 5 to rotate, and transmits power to the lead screw sprocket 8 through the clutch sprocket 6, thereby driving the lead screw to rotate and driving the cable sprocket to work. At the same time, several sets of tension devices 3 are installed between the large gear ring 4 and the drum 11. The large gear ring 4 rotates while driving the drum 11 to rotate, thereby realizing the winch cable retracting and releasing. The large gear ring 4 performs parking brakes through the brake disc brake device 12. The large gear ring 4 participates in the drum drive, cable drive and winch braking at the same time. The cable sprocket 5 and the clutch sprocket 6 are installed on the cable sprocket bracket 7 at the same time, and the cable sprocket bracket 7 is fixed on the arc frame 9. There are several mounting holes evenly distributed on the arc frame 9, so that the entire cable sprocket device can rotate around the central axis of the drum 11 to achieve a variable cable output angle. Because the guide wheel positions of different platforms are different, the relative positions of the winch and the guide wheel are also different, resulting in different cable output angles. The variable cable output angle can be applied to different platforms.

[0048] During normal operation, the cable sprocket 5 drives the sprocket d6-3 to rotate through the chain a, the handwheel 6-9 is in the left meshing position, the sprocket d6-3 drives the handwheel 6-9 to rotate, the handwheel 6-9 drives the rotating shaft 6-1 to rotate, and the rotating shaft 6-1 drives the sprocket c6-2 to rotate. Because c6-2 is connected to the screw sprocket 8 through the chain b, the power is finally transmitted to the screw. When the cable deviation occurs, the handwheel 6-9 is pushed to move right, and the handwheel 6-9 is disengaged from the sprocket d6-3 transmission. The screw can be debugged separately to eliminate the deviation.

[0049] The winch can achieve 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 and maintains a constant tension by reversing the drum 11. However, when the hydraulic control system or the tension control valve 14 fails or malfunctions, the second layer of mechanical tension protection will intervene. The spring compression amount in the tension device 3 controls the clamping force of the friction block 3-4. When the cable bearing capacity is exceeded, slippage occurs to prevent the cable from being broken.

Claims

1. Double tension protection winch for underwater blowout preventer, characterized in that: The invention comprises a frame (1), a roller (11) is mounted on the frame (1), a plurality of groups of tension devices (3) are evenly fixed on one end of the roller (11), and the other ends of the plurality of groups of tension devices (3) clamp a large gear ring (4); a motor (13) is fixed on the frame (1) near the large gear ring (4), a pinion (2) is arranged on the output shaft of the motor (13), and the pinion (2) meshes with the large gear ring (4); the frame (1) has a plurality of tension devices (3) at both ends of the roller (11). The arc frames (9) are welded respectively, and the arc frames (9) are fixed to the cable arrangement brackets (7) by bolts a, and a lead screw is installed between the two cable arrangement brackets (7) along the axial direction of the drum (11), and a lead screw sprocket (8) is arranged on the lead screw; the frame (1) is installed with a brake disc brake device (12) near the large gear ring (4); and also includes a hydraulic control system, which is respectively connected to the motor (13), the tension device (3) and the brake disc brake device (12).

2. The protection winch according to claim 1, characterized in that: The arc-shaped frame (9) is evenly provided with a plurality of mounting holes, the bolts a are arranged in the mounting holes, and guide wheels (10) are also arranged on both sides of the arc-shaped frame (9).

3. The protection winch according to claim 1, characterized in that: The cable arrangement bracket (7) is provided with a cable arrangement sprocket (5) and a clutch sprocket (6); the cable arrangement sprocket (5) comprises a sprocket a and a sprocket b; the clutch sprocket (6) comprises a sprocket c (6-2) and a sprocket d (6-3); the lead screw sprocket (8) comprises a sprocket e and a sprocket f; the sprocket a is meshed with the large gear ring (4); the sprocket b is connected to the sprocket d (6-3) via a chain a; the sprocket c (6-2) is connected to the sprocket e via a chain b; and the sprocket f is fixed to the lead screw.

4. The protection winch according to claim 3, characterized in that: The clutch sprocket (6) comprises a rotating shaft (6-1), on which an outer sprocket c (6-2), a copper sleeve (6-5) and a hand wheel (6-9) are sequentially mounted, and an outer sprocket d (6-3) is mounted on one end of the copper sleeve (6-5) and the hand wheel (6-9). The sprocket d (6-3) is mounted on an outer support seat (6-4) at one end close to the hand wheel (6-9), and the support seat (6-4) is fixed to the cable arrangement bracket (7) by screws.

5. The protection winch according to claim 4, characterized in that: A steel ball (6-6) is arranged between the support seat (6-4) and the sprocket d (6-3); a pressure block (6-8) and a locking block (6-7) are arranged on the support seat (6-4) along the radial direction of the steel ball (6-6); a spring II (6-11) and a retaining ring (6-10) are arranged on the end of the hand wheel (6-9) away from the sprocket d (6-3); and the hand wheel (6-9) is limited by the retaining ring (6-10).

6. The protection winch according to claim 1, characterized in that: The tension device (3) comprises an upper bracket (3-1) and a lower bracket (3-6), one end of the upper bracket (3-1) is provided 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; the large gear ring (4) is arranged between the upper clamping plate and the lower clamping plate, and the upper clamping plate and the large gear ring (4), the lower clamping plate and the large gear ring (4) are symmetrically fixed to the pressure plate (3-2), the friction block mounting plate (3-3) and the friction block (3-4) in turn by screws, and the tension cylinder (3-5) is installed on the side of the lower clamping plate away from the fixed pressure plate (3-2).

7. The protection winch according to claim 6, characterized in that: The lower bracket (3-6) is L-shaped, and the other end of the lower bracket (3-6) is fixed to the roller (11) by means of screws. An adjusting gasket (3-7) is also provided between the lower bracket (3-6) and the roller (11).

8. The protection winch according to claim 6, characterized in that: The tension cylinder (3-5) comprises a cylinder body (3-5.1) and a push rod (3-5.2), one end of the cylinder body (3-5.1) is covered with the push rod (3-5.2), and the other end of the cylinder body (3-5.1) is connected to the pressure cover (3-5.4) through a thread, the push rod (3-5.2) and the pressure cover (3-5.4) are in contact, and a spring I (3-5.3) is arranged between the push rod (3-5.2) and the pressure cover (3-5.4).

9. The protection winch according to claim 8, 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 gland (3-5.4) is also provided with a scale.

10. The protection winch according to claim 1, characterized in that: The hydraulic control system comprises a proportional reversing valve (15), one end of the proportional reversing valve (15) is connected to the motor (13) via a tension control valve (14), and the other end of the proportional reversing valve (15) is respectively connected to a disc brake control valve (17) and a free lowering control valve (18) via a pressure reducing valve (16), an oil outlet of the disc brake control valve (17) is connected to a brake disc brake device (12), and an oil outlet of the free lowering control valve (18) is connected to a tension device (3).

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