Hydraulic driver of blowout preventer

Abstract

The blowout preventer hydraulic driver comprises a blowout preventer and a control system, first protective shells are fixedly arranged on the left side and the right side of the blowout preventer correspondingly, the other end of each first protective shell is in threaded connection with a first hydraulic cylinder, and a first piston is arranged in each first hydraulic cylinder; the other end of each first hydraulic cylinder is in threaded connection with a first valve cover, a second protective shell is welded to the other side of each first valve cover, a first locking rod is arranged in each second protective shell in a penetrating mode, and a balance rod is arranged at the end, close to the blowout preventer, of each first locking rod; the other end of each balance rod is in threaded connection with a first flashboard shaft, the other end of each first flashboard shaft is fixedly connected with a locking flashboard, a blind groove is formed in one side of each locking flashboard, and the problem that an existing blowout preventer is poor in driving sealing performance is solved.

Description

Technical Field

[0001] The invention belongs to the technical field of petroleum drilling equipment, and in particular relates to a hydraulic driver for a blowout preventer. Background Art

[0002] BOP is a key part of well control device, and is an important device to control wellhead pressure and effectively prevent blowout accidents. The switch of hydraulic BOP is controlled by hydraulic oil provided by hydraulic BOP control device. The control device prepares and stores enough pressure oil in advance, and controls the flow direction of pressure oil, so that BOP can be switched on and off quickly. BOP realizes the cut-off function by controlling the pressure of wellhead or spraying system. It starts automatically when the pressure exceeds the set value, and reduces the flow speed of liquid or gas by closing or adjusting valves, or even completely cuts off its flow, thereby preventing the occurrence of gushing or spraying at the wellhead.

[0003] The hydraulic driver of the blowout preventer is an important component that drives the blowout preventer to work. Although the current hydraulic driver of the blowout preventer has significant advantages such as large driving force, stable operation, and fast response speed, it also has the limitation of low sealing performance in practical applications. Therefore, a hydraulic driver of the blowout preventer with better sealing performance is designed to solve the problem of low sealing performance of the existing blowout preventer driver for the blowout preventer sealing work. Summary of the invention

[0004] The purpose of the present invention is to provide a hydraulic driver for a blowout preventer in the existing device to solve the problems raised in the above background technology.

[0005] In order to solve the above technical problems, the present invention provides the following technical solutions: a hydraulic driver for a blowout preventer, comprising a blowout preventer and a control system, wherein first protective shells are fixedly arranged on both sides of the blowout preventer, the other end of each of the first protective shells is threadedly connected to a first hydraulic cylinder, a first piston is arranged inside each of the first hydraulic cylinders, the other end of each of the first hydraulic cylinders is threadedly connected to a first valve cover, a second protective shell is welded to the other side of each of the first valve covers, a first locking rod is penetrated inside each of the second protective shells, a balance rod is arranged at one end of each of the first locking rods close to the blowout preventer, a first gate shaft is threadedly connected at the other end of each of the balance rods, a locking gate is fixedly connected at the other end of each of the first gate shafts, a blind groove is provided on one side of the locking gate, a motor sleeve is welded in the blind groove, a first motor is fixedly installed inside the motor sleeve, a first gear is sleeved on the output end of the first motor, a second gear is meshedly connected to the upper and lower sides of the first gear, a connecting screw is threadedly connected to the center of each of the second gears, and an auxiliary clamping plate is fixedly connected to one end of each of the connecting screws close to the center of the blowout preventer; The blowout preventer is fixedly provided with a third protective shell on both sides below the first protective shell, the other end of each of the third protective shells is threadedly connected to a second hydraulic cylinder, a second piston is arranged inside each of the second hydraulic cylinders, the other end of each of the second hydraulic cylinders is threadedly connected to a second valve cover, the other side of each of the second valve covers is welded with a fourth protective shell, the lower section of each of the third protective shells away from the blowout preventer is welded with a support plate, a motor frame is welded above the other end of each of the support plates, a second motor is fixedly installed inside the upper end of each of the motor frames, and each of the third protective shells is threadedly connected to a second hydraulic cylinder, a second piston is arranged inside the inner side of each of the second hydraulic cylinders, a second valve cover is threadedly connected to the other end of each of the second hydraulic cylinders, a fourth protective shell is welded with a fourth protective shell on the other side of each of the second hydraulic cylinders, a support plate is welded to the lower section of each of the third protective shells away from the blowout preventer, a motor frame is welded to the upper side of each of the other ends of the support plates, a second motor is fixedly installed inside the upper end of each of the motor frames, and a fourth protective shell is welded with a third protective shell on the lower section of each of the third protective shells The output ends of the two motors are connected to one end of the second locking rod through a coupling, and the second locking rod is inserted into the interior of the fourth protective shell, and the other end of the second locking rod is inserted into the interior of one side of the second piston, and the other side of the second piston is threadedly connected with a second gate shaft, and the other end of the second gate shaft is fixedly connected with a cut-off gate, and the cut-off gate includes a cut-off knife, and an oil flow channel is opened inside the cut-off knife, and the oil flow channel leads to the sliding cavity from bottom to top, and an auxiliary sealing plate is slidably connected in the sliding cavity, and the other end of the auxiliary sealing plate passes through the cut-off knife and extends toward the center of the blowout preventer.

[0006] The present invention further describes that the first locking rod is threadedly connected to the first valve cover and passes through the center of the first valve cover. The staff rotates the first locking rod to achieve forward and backward movement of the first locking rod relative to the first valve cover, thereby achieving locking and unlocking of the drive mechanism.

[0007] The present invention further illustrates that a locking pressure cap is provided at one end of the first locking rod, a slot hole matched with the locking pressure cap is opened on the balance rod, and the locking pressure cap and the balance rod are not fixed to each other, which is conducive to locking the wellhead by hydraulically driving the locking gate plate, and then the first gate plate shaft drives the balance rod to move inward, and then the first locking rod is rotated to lock the blowout prevention drive mechanism, so that the locking pressure cap enters the slot hole of the balance rod, thereby realizing manual locking of the drive mechanism.

[0008] The present invention further describes that the second locking rod passes through the center of the second valve cover and is threadedly connected to the second valve cover. The second motor serves as a power source. The second motor drives the second locking rod to rotate through the coupling, thereby pushing the second locking rod inward relative to the second valve cover, thereby realizing automatic locking of the shut-off gate.

[0009] The present invention further illustrates that the locking gate is a T-shaped structure when viewed from the side, and a slot matching the wellhead is provided at one end of the locking gate close to the blowout preventer, and a slot matching the wellhead is also provided at one end of the auxiliary clamping plate close to the blowout preventer, so as to ensure that the locking gate and the auxiliary clamping plate are tightly fitted to the wellhead, thereby achieving a good sealing and blowout prevention effect.

[0010] The present invention further describes that the first gate shaft is composed of a larger cylindrical shaft part and a smaller screw part, the smaller screw part is threadedly connected to the balance rod and passes through the center of the first piston, and a small section of the larger cylindrical shaft part connected to the smaller screw part is inserted into the inner side of the first piston.

[0011] The present invention further describes that a pressure sensor is also provided on the inner surface of the notch of the auxiliary clamping plate, and the pressure sensor, the first motor and the second motor are all connected to the control system signal.

[0012] The present invention further illustrates that the control system controlling the locking gate plate also includes the following control method: When the blowout preventer is automatically started, the control system controls the hydraulic oil to enter the chamber outside the first hydraulic cylinder, and the hydraulic oil pushes the first piston to slide toward the inner side of the blowout preventer. At the same time, the first piston pushes the first gate shaft to drive the locking gate to move inward until the locking gate is tightly fitted with the wellhead. Then the control system controls the first motor to start, and the first motor rotates forward to drive the first gear to rotate. Due to the meshing effect of the first gear, the second gear rotates at the same time. The rotation of the second gear causes the connecting screw threadedly connected thereto to drive the auxiliary clamping plate to push inward. When the pressure between the auxiliary clamping plate and the wellhead is set to between a and b, the auxiliary clamping plate tightly seals the wellhead without causing damage to parts due to excessive pressure. The actual pressure value received by the pressure sensor is c; When c is less than a, the control system controls the first motor to continue to rotate forward, so that the connecting screw continues to drive the auxiliary pressing plate to push inward, until c is greater than or equal to a, and the first motor is controlled to stop running; When c is greater than a and c is less than b, the control system controls the first motor to stop running; When c is greater than b, the control system controls the first motor to reverse, so that the connecting screw pulls the auxiliary clamping plate to move outward, and controls the first motor to stop running when c is less than or equal to b.

[0013] The present invention further illustrates that the control system controls the cut-off gate further including the following control method: When an emergency such as a blowout, fire or leakage occurs at the work site, it is necessary to quickly cut off the oil pipeline to prevent the situation from escalating. At this time, the control system controls the hydraulic oil to enter the second hydraulic cylinder, and at the same time, the second piston pushes the second gate shaft to drive the shut-off gate to move inward, and at the same time controls the second motor to start forward rotation. The second motor drives the second locking rod to rotate through the coupling. The speed at which the second locking rod pushes inward is the same as the speed at which the second piston moves inward, so as to achieve automatic and synchronous locking. The shut-off knife cuts off the oil pipeline, and at the same time, the oil under the shut-off knife enters the sliding cavity through the oil flow channel, squeezing the outer side of the auxiliary sealing plate, so that the auxiliary sealing plate is pushed inward, thereby enhancing the sealing effect of the shut-off gate.

[0014] Compared with the prior art, the beneficial effects achieved by the present invention are: By providing the first motor as a power source, the first motor as a power source rotates forward to drive the first gear to rotate, and the second gear rotates simultaneously due to the meshing action of the first gear, and the rotation of the second gear causes the connecting screw threadedly connected thereto to drive the auxiliary clamping plate to push inward, thereby realizing auxiliary sealing work on the wellhead; By providing the cut-off gate, including the cut-off knife, the cut-off knife cuts off the oil pipeline, and at the same time, the oil below the cut-off knife enters the sliding cavity through the oil flow channel, squeezes the outer side of the auxiliary sealing plate, and pushes the auxiliary sealing plate inward, thereby enhancing the sealing effect of the cut-off gate. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] The accompanying drawings are used to provide a further understanding of the present invention and constitute a part of the specification. Together with the embodiments of the present invention, they are used to explain the present invention and do not constitute a limitation of the present invention. In the accompanying drawings: Figure 1 is an overall front cross-sectional view of an embodiment of the present invention; Figure 2 It is a schematic diagram of the overall structure of an embodiment of the present invention; Figure 3 is a front view of an embodiment of the present invention; Figure 4 is an enlarged view of region A of an embodiment of the present invention; Figure 5 Schematic diagram of the locking gate portion of an embodiment of the present invention; Figure 6 is an enlarged view of region B of an embodiment of the present invention; Figure 7 is an enlarged view of region C of an embodiment of the present invention; In the figure: 1, blowout preventer; 2, first protective shell; 3, first hydraulic cylinder; 31, first piston; 4, first valve cover; 5, second protective shell; 6, first locking rod; 61, locking gland; 7, balance rod; 8, first gate shaft; 9, locking gate; 91, motor sleeve; 92, first motor; 93, first gear; 94, second gear; 95, connecting screw; 96, auxiliary clamping plate; 97, blind groove; 10, third protective shell; 11, second hydraulic cylinder; 111, second piston; 12, second valve cover; 13, fourth protective shell; 14, support plate; 15, motor frame; 16, second motor; 17, coupling; 18, second locking rod; 19, second gate shaft; 20, cut-off gate; 201, oil flow channel; 202, sliding cavity; 203, auxiliary sealing plate; 204, cut-off knife. DETAILED DESCRIPTION

[0016] The following is a further non-limiting detailed description of the technical solution of the present invention in conjunction with the preferred embodiments and the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0017] An embodiment of the present invention provides a hydraulic actuator for a blowout preventer, referring to Figure 1-Figure 7 , Figure 1 FIG. 2 is an overall front cross-sectional view of an embodiment of the present invention, as shown in FIG. Figure 1As shown, the hydraulic driver of a blowout preventer includes a blowout preventer 1 and a control system. The first protective housing 2 is fixedly arranged on both sides of the blowout preventer 1. The other end of each first protective housing 2 is threadedly connected to a first hydraulic cylinder 3. A first piston 31 is arranged inside each first hydraulic cylinder 3. When the high-pressure liquid provided by the hydraulic pump enters the outer chamber of the first hydraulic cylinder 3, the pressure in the side chamber rises rapidly. According to Pascal's law, this pressure will be evenly transmitted to the outer surface of the first piston 31, thereby generating a thrust to push the first piston 31 inward, thereby realizing the locking drive work. The other end of each first hydraulic cylinder 3 is threadedly connected to a first valve cover 4. The other side of each first valve cover 4 is welded with a second protective housing 5. The interior of each second protective housing 5 is penetrated with a first locking rod 6. The first locking rod 6 is used to fix the gate by mechanical means after the blowout preventer 1 is hydraulically shut in, and then the high pressure of the hydraulic pressure oil is unloaded to avoid long-term well shut-in and oil pipe leakage. Each first locking rod 6 is provided with a balance rod 7 at one end close to the blowout preventer 1, and the balance rod 7 can disperse the stress generated when the first piston 31 slides, thereby enhancing the performance of the hydraulic drive. The other end of each balance rod 7 is threadedly connected to a first gate shaft 8, and the other end of each first gate shaft 8 is fixedly connected to a locking gate 9, and the first gate shaft 8 is used to drive the locking gate 9 to move, thereby realizing the locking work of the wellhead.

[0018] like Figure 4 and Figure 5 As shown, a blind groove 97 is provided on one side of the locking gate 9, and a motor sleeve 91 is welded in the blind groove 97. A first motor 92 is fixedly installed inside the motor sleeve 91. A first gear 93 is sleeved on the output end of the first motor 92. A second gear 94 is meshed and connected to the upper and lower sides of the first gear 93. A connecting screw 95 is threadedly connected to the center of each second gear 94. An auxiliary clamping plate 96 is fixedly connected to one end of each connecting screw 95 close to the center of the blowout preventer 1. The first motor 92 is used as a power source. The first motor 92 rotates forward to drive the first gear 93 to rotate. Due to the meshing effect of the first gear 93, the second gear 94 rotates at the same time. The rotation of the second gear 94 causes the connecting screw 95 threadedly connected thereto to drive the auxiliary clamping plate 96 to push inward, thereby realizing the auxiliary sealing work of the wellhead.

[0019] like Figure 1As shown, the blowout preventer 1 is fixedly provided with a third protective shell 10 on both sides below the first protective shell 2, the other end of each third protective shell 10 is threadedly connected with a second hydraulic cylinder 11, a second piston 111 is arranged inside each second hydraulic cylinder 11, the other end of each second hydraulic cylinder 11 is threadedly connected with a second valve cover 12, and a fourth protective shell 13 is welded to the other side of each second valve cover 12, and a support plate 14 is welded to the lower section of each third protective shell 10 away from the blowout preventer 1, and a motor frame 15 is welded above the other end of each support plate 14, and a second motor 16 is fixedly installed inside the upper end of each motor frame 15, and the output end of each second motor 16 is connected to one end of a second locking rod 18 through a coupling 17, and the second motor 16 drives the second locking rod 18 to rotate through the coupling 17 to realize the automatic locking function, which is conducive to completing the locking work in time in an emergency to improve safety. The second locking rod 18 is inserted into the fourth protective housing 13, and the other end of the second locking rod 18 is inserted into one side of the second piston 111. The second side of the second piston 111 is threadedly connected with the second gate shaft 19, and the other end of the second gate shaft 19 is fixedly connected with the cut-off gate 20. The second piston 111 is pushed inward by hydraulic pressure, and the second piston 111 drives the cut-off gate 20 to move inward through the second gate shaft 19 to cut off and seal the oil pipeline.

[0020] like Figure 6 As shown, the cut-off gate 20 includes a cutter blade 204, an oil flow channel 201 is provided inside the cutter blade 204, and the oil flow channel 201 leads from bottom to top to the sliding chamber 202, and an auxiliary sealing plate 203 is slidably connected in the sliding chamber 202, and the other end of the auxiliary sealing plate 203 passes through the cutter blade 204 and extends toward the center of the blowout preventer 1. After the cut-off seal is completed, the oil below enters the sliding chamber 202 through the oil flow channel 201, squeezes the outer side of the auxiliary sealing plate 203, and pushes the auxiliary sealing plate 203 inward, thereby enhancing the sealing effect of the cut-off gate 20.

[0021] In certain preferred embodiments, Figure 1 As shown, the first locking rod 6 is threadedly connected to the first valve cover 4 and passes through the center of the first valve cover 4. The staff rotates the first locking rod 6 to move the first locking rod 6 back and forth relative to the first valve cover 4, thereby achieving locking and unlocking of the drive mechanism.

[0022] In certain preferred embodiments, Figure 7As shown, a locking gland 61 is provided at one end of the first locking rod 6, a slot hole matching the locking gland 61 is provided on the balance rod 7, and the locking gland 61 and the balance rod 7 are not fixed to each other. It is beneficial to lock the wellhead by hydraulic drive with the locking gate 9, the first gate shaft 8 drives the balance rod 7 to move inward, and then the blowout prevention drive mechanism is locked by rotating the first locking rod 6, so that the locking gland 61 enters the slot hole of the balance rod 7, and the manual locking of the drive mechanism is realized.

[0023] In certain preferred embodiments, Figure 1 As shown, the second locking rod 18 passes through the center of the second valve cover 12 and is threadedly connected to the second valve cover 12. The second motor 16 serves as a power source. The second motor 16 drives the second locking rod 18 to rotate through the coupling 17, so that the second locking rod 18 is pushed inward relative to the second valve cover 12, thereby realizing automatic locking of the shut-off gate 20.

[0024] In certain preferred embodiments, Figure 5 As shown, the locking gate 9 is a T-shaped structure when viewed from the side, and a notch adapted to the wellhead is provided at one end of the locking gate 9 close to the blowout preventer 1, and a notch adapted to the wellhead is also provided at one end of the auxiliary clamping plate 96 close to the blowout preventer 1, so as to ensure that the locking gate 9 and the auxiliary clamping plate 96 are tightly fitted to the wellhead, thereby achieving a good sealing and blowout prevention effect.

[0025] In certain preferred embodiments, Figure 1 As shown, the first gate shaft 8 is composed of a larger cylindrical shaft part and a smaller screw part. The smaller screw part is threadedly connected to the balance rod 7 and passes through the center of the first piston 31, and one end of the balance rod 7 threadedly connected to the first gate shaft 8 is against the outside of the first piston 31, and a small section of the larger cylindrical shaft part connected to the smaller screw part is inserted into the inner side of the first piston 31, which is conducive to the first piston 31 driving the first gate shaft 8 to move.

[0026] In some preferred embodiments, a pressure sensor is further provided on the inner surface of the notch of the auxiliary clamping plate 96, and the pressure sensor, the first motor 92, and the second motor 16 are all connected to the control system signal.

[0027] In some preferred embodiments, the control system for controlling the locking gate 9 also includes the following control method: When the blowout preventer 1 is automatically started, the control system controls the hydraulic oil to enter the chamber outside the first hydraulic cylinder 3, and the hydraulic oil pushes the first piston 31 to slide toward the inner side of the blowout preventer 1. At the same time, the first piston 31 pushes the first gate shaft 8 to drive the locking gate 9 to move inward until the locking gate 9 is tightly fitted with the wellhead. Then the control system controls the first motor 92 to start, and the first motor 92 rotates forward to drive the first gear 93 to rotate. Due to the meshing action of the first gear 93, the second gear 94 rotates at the same time. The rotation of the second gear 94 causes the connecting screw 95 threadedly connected thereto to drive the auxiliary clamping plate 96 to push inward. When the pressure between the auxiliary clamping plate 96 and the wellhead is set to between a and b, the auxiliary clamping plate 96 tightly seals the wellhead without causing damage to parts due to excessive pressure. The actual pressure value received by the pressure sensor is c; When c is less than a, the control system controls the first motor 92 to continue to rotate forward, so that the connecting screw 95 continues to drive the auxiliary clamping plate 96 to push inward, until c is greater than or equal to a, and the first motor 92 is controlled to stop running; When c is greater than a and c is less than b, the control system controls the first motor 92 to stop running; When c is greater than b, the control system controls the first motor 92 to reverse, so that the connecting screw 95 pulls the auxiliary clamping plate 96 to move outward, until c is less than or equal to b, and controls the first motor 92 to stop running.

[0028] In some preferred embodiments, the control system controls the cut-off gate 20 further including the following control method: When an emergency such as a blowout, fire or leakage occurs at the work site, it is necessary to quickly cut off the oil pipeline to prevent the situation from escalating. At this time, the control system controls the hydraulic oil to enter the second hydraulic cylinder 11, and at the same time, the second piston 111 pushes the second gate shaft 19 to drive the shut-off gate 20 to move inward, and at the same time controls the second motor 16 to start forward rotation. The second motor 16 drives the second locking rod 18 to rotate through the coupling 17. The speed at which the second locking rod 18 pushes inward is the same as the speed at which the second piston 111 moves inward, so as to achieve automatic and synchronous locking. The cutter 204 cuts off the oil pipeline, and at the same time, the oil under the cutter 204 enters the sliding cavity 202 through the oil flow channel 201, squeezing the outer side of the auxiliary sealing plate 203, so that the auxiliary sealing plate 203 is pushed inward, thereby enhancing the sealing effect of the shut-off gate 20.

[0029] In the description of the present invention, it is necessary to understand that the terms "up", "down", "front", "back", "left", "right", etc., indicating directions or positional relationships, are based on the directions or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention, and do not indicate or imply that the device or element referred to must have a specific direction, be constructed and operated in a specific direction, and therefore cannot be understood as a limitation on the present invention.

[0030] Finally, it should be pointed out that the above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit them. Although the present invention has been described in detail with reference to the above embodiments, a person skilled in the art should understand that the technical solutions described in the above embodiments can still be modified, or some of the technical features can be replaced by equivalents, and these modifications or replacements do not deviate the essence of the corresponding technical solutions from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims

1. A blowout preventer hydraulic driver, comprising a blowout preventer (1) and a control system, characterized in that: The blowout preventer (1) is fixedly provided with a first protective shell (2) on both left and right sides, the other end of each first protective shell (2) is threadedly connected to a first hydraulic cylinder (3), a first piston (31) is arranged inside each first hydraulic cylinder (3), the other end of each first hydraulic cylinder (3) is threadedly connected to a first valve cover (4), the other side of each first valve cover (4) is welded with a second protective shell (5), a first locking rod (6) is penetrated inside each second protective shell (5), a balance rod (7) is arranged at one end of each first locking rod (6) close to the blowout preventer (1), and the other end of each balance rod (7) is threadedly connected to a first gate The first gate shaft (8) includes a plate shaft (8), the other end of each of the first gate shafts (8) is fixedly connected to a locking gate (9), a blind groove (97) is provided on one side of the locking gate (9), a motor sleeve (91) is welded in the blind groove (97), a first motor (92) is fixedly installed inside the motor sleeve (91), a first gear (93) is sleeved on the output end of the first motor (92), a second gear (94) is meshedly connected to the upper and lower sides of the first gear (93), a connecting screw (95) is threadedly connected to the center of each of the second gears (94), and an auxiliary clamping plate (96) is fixedly connected to one end of each of the connecting screws (95) close to the center of the blowout preventer (1).

2. A hydraulic driver for a blowout preventer according to claim 1, characterized in that: The blowout preventer (1) is fixedly provided with a third protective shell (10) on both left and right sides below the first protective shell (2); the other end of each of the third protective shells (10) is threadedly connected to a second hydraulic cylinder (11); a second piston (111) is arranged inside each of the second hydraulic cylinders (11); the other end of each of the second hydraulic cylinders (11) is threadedly connected to a second valve cover (12); the other side of each of the second valve covers (12) is welded with a fourth protective shell (13); the lower section of each of the third protective shells (10) away from the blowout preventer (1) is welded with a support plate (14); a motor frame (15) is welded above the other end of each of the support plates (14); a second motor (16) is fixedly installed inside the upper end of each of the motor frames (15); the output end of each of the second motors (16) is connected to a One end of a second locking rod (18) is connected through a coupling (17), and the second locking rod (18) is disposed inside the fourth protective housing (13), and the other end of the second locking rod (18) is inserted into one side of the second piston (111), the other side of the second piston (111) is threadedly connected to a second gate shaft (19), the other end of the second gate shaft (19) is fixedly connected to a cut-off gate (20), the cut-off gate (20) comprises a cut-off knife (204), an oil flow channel (201) is provided inside the cut-off knife (204), the oil flow channel (201) leads from bottom to top to a sliding chamber (202), an auxiliary sealing plate (203) is slidably connected inside the sliding chamber (202), the other end of the auxiliary sealing plate (203) passes through the cut-off knife (204) and extends toward the center of the blowout preventer (1); The first locking rod (6) is threadedly connected to the first valve cover (4) and passes through the center of the first valve cover (4). A staff member rotates the first locking rod (6) to move the first locking rod (6) forward and backward relative to the first valve cover (4), thereby achieving locking and unlocking of the drive mechanism.

3. A hydraulic driver for a blowout preventer according to claim 2, characterized in that: A locking gland (61) is provided at one end of the first locking rod (6), a slot hole matched with the locking gland (61) is provided on the balance rod (7), and the locking gland (61) and the balance rod (7) are not fixed to each other, which is conducive to locking the wellhead by the locking gate (9) through hydraulic drive, and then the first gate shaft (8) drives the balance rod (7) to move inward, and then the blowout prevention drive mechanism is locked by rotating the first locking rod (6), so that the locking gland (61) enters the slot hole of the balance rod (7), thereby realizing manual locking of the drive mechanism.

4. A hydraulic driver for a blowout preventer according to claim 3, characterized in that: The second locking rod (18) passes through the center of the second valve cover (12) and is threadedly connected to the second valve cover (12). The second motor (16) serves as a power source. The second motor (16) drives the second locking rod (18) to rotate via the coupling (17), thereby pushing the second locking rod (18) inward relative to the second valve cover (12) to achieve automatic locking of the shut-off gate (20).

5. A hydraulic driver for a blowout preventer according to claim 4, characterized in that: The locking gate (9) is a T-shaped structure when viewed from the side. The locking gate (9) is provided with a notch adapted to the wellhead at one end close to the blowout preventer (1). The auxiliary clamping plate (96) is also provided with a notch adapted to the wellhead at one end close to the blowout preventer (1). This ensures that the locking gate (9) and the auxiliary clamping plate (96) are closely fitted to the wellhead, thereby achieving a good sealing and blowout prevention effect.

6. A hydraulic driver for a blowout preventer according to claim 5, characterized in that: The first gate shaft (8) is composed of a larger cylindrical shaft portion and a smaller screw portion, the smaller screw portion is threadedly connected to the balance rod (7) and passes through the center of the first piston (31), and a small section of the larger cylindrical shaft portion connected to the smaller screw portion is inserted into the inner side of the first piston (31).

7. A hydraulic driver for a blowout preventer according to claim 6, characterized in that: A pressure sensor is also provided on the inner surface of the notch of the auxiliary pressing plate (96); the pressure sensor, the first motor (92), and the second motor (16) are all connected to the control system signal.

8. A hydraulic driver for a blowout preventer according to claim 7, characterized in that: The control system controlling the locking gate (9) further includes the following control method: When the blowout preventer (1) is automatically started, the control system controls the hydraulic oil to enter the chamber outside the first hydraulic cylinder (3), and the hydraulic oil pushes the first piston (31) to slide inwardly close to the inner side of the blowout preventer (1). At the same time, the first piston (31) pushes the first gate shaft (8) to drive the locking gate (9) to move inwardly until the locking gate (9) is tightly fitted with the wellhead. Then, the control system controls the first motor (92) to start, and the first motor (92) rotates forward to drive the first gear (93) to rotate. Due to the meshing effect of the first gear (93), the second gear (94) rotates at the same time. The rotation of the second gear (94) causes the connecting screw (95) threadedly connected thereto to drive the auxiliary clamping plate (96) to push inwardly. When the pressure between the auxiliary clamping plate (96) and the wellhead is set to be between a and b, the auxiliary clamping plate (96) tightly seals the wellhead without causing damage to parts due to excessive pressure. The pressure value actually received by the pressure sensor is c; When c is less than a, the control system controls the first motor (92) to continue to rotate forward, so that the connecting screw (95) continues to drive the auxiliary pressing plate (96) to move inward, until c is greater than or equal to a, and the first motor (92) is controlled to stop running; When c is greater than a and c is less than b, the control system controls the first motor (92) to stop running; When c is greater than b, the control system controls the first motor (92) to reverse, causing the connecting screw (95) to pull the auxiliary clamping plate (96) to move outward, until c is less than or equal to b, at which time the first motor (92) is controlled to stop running.

9. A hydraulic driver for a blowout preventer according to claim 8, characterized in that: The control system controlling the cut-off gate (20) further includes the following control method: When the oil pipeline needs to be cut off, the control system controls the hydraulic oil to enter the second hydraulic cylinder (11), and at the same time, the second piston (111) pushes the second gate shaft (19) to drive the shutoff gate (20) to move inward, and at the same time, controls the second motor (16) to start forward rotation, and the second motor (16) drives the second locking rod (18) to rotate through the coupling (17). The speed at which the second locking rod (18) pushes inward is the same as the speed at which the second piston (111) moves inward, so as to achieve automatic and synchronous completion of the locking work, and the shutoff knife (204) cuts off the oil pipeline. At the same time, the oil below the shutoff knife (204) enters the sliding cavity (202) through the oil flow channel (201), squeezes the outer side of the auxiliary sealing plate (203), and pushes the auxiliary sealing plate (203) inward, thereby enhancing the sealing effect of the shutoff gate (20).

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