A hydraulic drive for a blowout preventer

Abstract

The application discloses a blowout preventer hydraulic driver, which comprises a blowout preventer and a control system, first protection housings are fixedly arranged on the left and right sides of the blowout preventer, first hydraulic cylinders are threadedly connected to the other ends of the first protection housings, first pistons are arranged in the first hydraulic cylinders, first valve covers are threadedly connected to the other ends of the first hydraulic cylinders, second protection housings are welded to the other sides of the first valve covers, first locking rods are arranged in the second protection housings, balance rods are arranged on the ends of the first locking rods close to the blowout preventer, first gate shafts are threadedly connected to the other ends of the balance rods, locking gates are fixedly connected to the other ends of the first gate shafts, and blind grooves are formed in the sides of the locking gates. The device solves the problem of poor sealing performance of the current blowout preventer driver.

Description

TECHNICAL FIELD

[0001] The present application belongs to the technical field of oil drilling equipment, and particularly relates to a hydraulic drive of blowout preventer. BACKGROUND

[0002] The blowout preventer is a key part of the well control device, and is an important device for controlling the wellhead pressure and effectively preventing blowout accidents. The switch of the hydraulic blowout preventer is controlled by the hydraulic oil provided by the hydraulic blowout preventer control device. The control device prepares and stores sufficient pressure oil in advance, and controls the flow direction of the pressure oil, so that the blowout preventer can be quickly switched. The blowout preventer realizes the cutting function by controlling the pressure of the wellhead or spraying system. When the pressure exceeds the set value, it is automatically started. By closing or adjusting the valve, the flow rate of liquid or gas is reduced, or even completely cut off, so as to prevent the occurrence of wellhead gushing or spraying.

[0003] The hydraulic drive of the blowout preventer is an important component for driving the blowout preventer to work. Although the current hydraulic drive of the blowout preventer has the advantages of large driving force, stable operation and fast response speed, it also has the limitation of low sealing performance in actual application. Therefore, a hydraulic drive of the blowout preventer with better sealing performance is designed to solve the problem of low sealing performance of the existing blowout preventer drive for the sealing work of the blowout preventer. SUMMARY

[0004] The present application aims at the existing device, a hydraulic drive of blowout preventer, to solve the problems raised in the background.

[0005] In order to solve the above technical problems, the present application provides the following technical scheme: a hydraulic drive of blowout preventer, comprising a blowout preventer and a control system, the left and right sides of the blowout preventer are fixedly provided with first protective housings, the other end of each first protective housing is threadedly connected with a first hydraulic cylinder, the inside of each first hydraulic cylinder is provided with a first piston, the other end of each first hydraulic cylinder is threadedly connected with a first valve cover, the other side of each first valve cover is welded with a second protective housing, the inside of each second protective housing is provided with a first locking rod, one end of each first locking rod close to the blowout preventer is provided with a balance rod, the other end of each balance rod is threadedly connected with a first gate shaft, the other end of each first gate shaft is fixedly connected with a locking gate, a blind groove is formed in one side of the locking gate, a motor sleeve is welded in the blind groove, a first motor is fixedly installed in the inside of the motor sleeve, a first gear is sleeved with the output end of the first motor, one second gear is meshingly connected with the upper and lower sides of the first gear, a connecting screw is threadedly connected with the center of each second gear, and an auxiliary pressing plate is fixedly connected with one end of each connecting screw close to the center of the blowout preventer.

[0006] The blowout preventer is fixedly arranged on the left and right sides below the first protective shell, each second hydraulic cylinder is arranged in each second hydraulic cylinder, each second hydraulic cylinder is threadedly connected with a second valve cover, each second valve cover is welded with a fourth protective shell, each third protective shell is welded with a support plate on the lower section of the side away from the blowout preventer, each support plate is welded with a motor bracket above the other end, each second motor is fixedly installed in each motor bracket, one end of each second motor is connected with a second locking rod through a shaft coupling, the second locking rod is arranged in the fourth protective shell, and the other end of the second locking rod is inserted into the side of the second piston, the second piston is threadedly connected with a second gate shaft, the other end of the second gate shaft is fixedly connected with a cutting gate, the cutting gate comprises a cutting knife, an oil flow channel is formed in the cutting knife, the oil flow channel is connected with a sliding cavity from bottom to top, an auxiliary sealing plate is slidably connected in the sliding cavity, and the other end of the auxiliary sealing plate extends to the center of the blowout preventer through the cutting knife.

[0007] The first locking rod is threadedly connected with the first valve cover and passes through the center of the first valve cover, the first locking rod is moved forward and backward relative to the first valve cover by rotating the first locking rod, and the locking and unlocking of the driving mechanism are realized.

[0008] One end of the first locking rod is provided with a locking gland, a groove is formed in the balance bar and matched with the locking gland, and the locking gland and the balance bar are not fixed with each other, so that after the locking gate is locked by the hydraulic drive, the first gate shaft drives the balance bar to move inward, and then the first locking rod is rotated to lock the blowout preventer driving mechanism, so that the locking gland is arranged in the groove of the balance bar, and the locking of the driving mechanism is realized.

[0009] The second locking rod passes through the center of the second valve cover and is threadedly connected with the second valve cover, the second motor serves as a power source, the second motor drives the second locking rod to rotate through the shaft coupling, the second locking rod is pushed inward relative to the second valve cover, and the automatic locking of the cutting gate is realized.

[0010] The application further discloses that the locking gate is in T-shaped structure in side view, and a groove matched with the well head is formed at one end of the locking gate close to the blowout preventer, and a groove matched with the well head is also formed at one end of the auxiliary compression plate close to the blowout preventer, so that the locking gate and the auxiliary compression plate are tightly attached to the well head, and good sealing blowout prevention effect is achieved.

[0011] The application further discloses that the first gate shaft is composed of a large cylindrical shaft part and a small screw part, the small screw part is threadedly connected with the balance rod and penetrates the center of the first piston, and a small section of the large cylindrical shaft part connected with the small screw part is inserted into the inside of the first piston.

[0012] The application further discloses that the inner surface of the groove of the auxiliary compression plate is further provided with a pressure sensor, and the pressure sensor, the first motor and the second motor are signal-connected with the control system.

[0013] The application further discloses that the control of the control system on the locking gate further comprises the following control method.

[0014] When the blowout preventer is automatically started, the control system controls hydraulic oil to enter the chamber outside the first hydraulic cylinder, the hydraulic oil pushes the first piston to slide towards the inside of the blowout preventer, at the same time, the first piston pushes the first gate shaft to drive the locking gate to move inwards until the locking gate is tightly attached to the well head, then the control system controls the first motor to be started, the first motor drives the first gear to rotate in the forward direction, since the first gear is engaged with the second gear, the second gear rotates synchronously with the first gear, the rotation of the second gear drives the connecting screw threadedly connected with the second gear to push the auxiliary compression plate inwards, when the pressure between the auxiliary compression plate and the well head is set to be between a and b, the auxiliary compression plate tightly seals the well head without the phenomenon that the parts are damaged due to excessive pressure, and the actual pressure value received by the pressure sensor is c.

[0015] When c is less than a, the control system controls the first motor to continue rotating in the forward direction, so that the connecting screw continues to drive the auxiliary compression plate to push inwards, until c is greater than or equal to a, the first motor is controlled to stop running.

[0016] When c is greater than a and c is less than b, the control system controls the first motor to stop running.

[0017] When c is greater than b, the control system controls the first motor to reverse, so that the connecting screw rod pulls the auxiliary compression plate to move outward until c is less than or equal to b, and the first motor is controlled to stop running.

[0018] The control system further controls the cutting-off gate plate, and the control method comprises the following steps:

[0019] When an emergency situation 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 getting worse. At this time, the control system controls the hydraulic oil to enter the second hydraulic cylinder, and the second piston pushes the second gate shaft to drive the cutting-off gate plate to move inward. At the same time, the second motor is controlled to start positive rotation. The second motor drives the second locking rod to rotate through the shaft coupling. The second locking rod pushes inward at the same speed as the second piston moves inward, so as to automatically synchronize the locking work. The cutting-off knife cuts off the oil pipeline, and at the same time, the oil below the cutting-off knife enters the sliding cavity through the oil flow channel, extrudes the outer side of the auxiliary sealing plate, and pushes the auxiliary sealing plate inward, thereby enhancing the sealing effect of the cutting-off gate plate.

[0020] Compared with the prior art, the present application has the following beneficial effects:

[0021] (1) The first motor is provided as a power source. The first motor drives the first gear to rotate in positive rotation. The second gear rotates simultaneously due to the meshing action of the first gear. The rotation of the second gear drives the connecting screw rod connected with the second gear to push the auxiliary compression plate inward, thereby achieving auxiliary sealing work on the wellhead.

[0022] (2) The cutting-off gate plate is provided, which comprises the cutting-off knife. The cutting-off knife cuts off the oil pipeline, and at the same time, the oil below the cutting-off knife enters the sliding cavity through the oil flow channel, extrudes the outer side of the auxiliary sealing plate, and pushes the auxiliary sealing plate inward, thereby enhancing the sealing effect of the cutting-off gate plate. BRIEF DESCRIPTION OF DRAWINGS

[0023] The accompanying drawings are included to provide a further understanding of the present application, and constitute a part of the specification, which together with the embodiments of the present application, serve to explain the present application, and do not constitute a limitation of the present application. In the drawings:

[0024] Figure 1 is a whole front view of an embodiment of the present application;

[0025] Figure 2 is a whole structure schematic view of an embodiment of the present application;

[0026] Figure 3is a front view of an embodiment of the present application;

[0027] Figure 4 is an enlarged view of area A of an embodiment of the present application;

[0028] Figure 5 is a schematic view of the locking gate portion of an embodiment of the present application;

[0029] Figure 6 is an enlarged view of area B of an embodiment of the present application;

[0030] Figure 7 is an enlarged view of area C of an embodiment of the present application;

[0031] 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 bar; 8, first gate shaft; 9, locking gate; 91, motor cover; 92, first electric motor; 93, first gear; 94, second gear; 95, connecting screw; 96, auxiliary compression 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 electric motor; 17, coupling; 18, second locking rod; 19, second gate shaft; 20, cutting gate; 201, oil flow channel; 202, sliding cavity; 203, auxiliary sealing plate; 204, cutting knife. DETAILED DESCRIPTION

[0032] The technical solutions of the present application will be further described in detail below with reference to preferred embodiments and the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present application, rather than all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by a person of ordinary skill in the art without creative work fall within the protection scope of the present application.

[0033] The embodiments of the present application provide a blowout preventer hydraulic drive, referring to Figures 1-7 , Figure 1 is a whole front sectional view of an embodiment of the present application, as Figure 1As shown, the hydraulic drive of the blowout preventer comprises a blowout preventer 1 and a control system, and the blowout preventer 1 is fixedly provided with first protective housings 2 on the left and right sides, one end of each first protective housing 2 is threadedly connected with a first hydraulic cylinder 3, the inside of each first hydraulic cylinder 3 is provided with a first piston 31, when high-pressure liquid provided by a hydraulic pump enters the outside chamber of the first hydraulic cylinder 3, the pressure in the chamber rapidly rises, according to Pascal's law, the pressure is uniformly transmitted to the outside surface of the first piston 31, thereby generating a thrust to push the first piston 31 inward, so as to realize the locking driving work. The other end of each first hydraulic cylinder 3 is threadedly connected with a first valve cover 4. The other side of each first valve cover 4 is welded with a second protective housing 5, the inside of each second protective housing 5 is provided with a first locking rod 6, the first locking rod 6 is used to fix the gate plate by mechanical method after the blowout preventer 1 is hydraulically closed, and then the high pressure of the hydraulic control pressure oil is discharged, so as to prevent the oil pipe from leaking due to long-term well closure. One end of each first locking rod 6 close to the blowout preventer 1 is provided with a balance rod 7, the balance rod 7 can disperse the stress generated when the first piston 31 slides, and enhance the performance of the hydraulic drive. The other end of each balance rod 7 is threadedly connected with a first gate shaft 8, the other end of each first gate shaft 8 is fixedly connected with a locking gate plate 9, the first gate shaft 8 is used to drive the locking gate plate 9 to move, so as to realize the locking work of the wellhead.

[0034] As shown in Figure 4 and Figure 5 One side of the locking gate plate 9 is provided with a blind groove 97, the blind groove 97 is welded with a motor sleeve 91, the inside of the motor sleeve 91 is fixedly installed with a first motor 92, the output end of the first motor 92 is sleeved with a first gear 93, the upper and lower sides of the first gear 93 are engagedly connected with a second gear 94, the center of each second gear 94 is threadedly connected with a connecting screw rod 95, one end of each connecting screw rod 95 close to the center of the blowout preventer 1 is fixedly connected with an auxiliary compression plate 96. The first motor 92 is used as a power source, the first motor 92 rotates in the forward direction to drive the first gear 93 to rotate, the first gear 93 rotates in the forward direction due to the meshing of the second gear 94, the rotation of the second gear 94 drives the connecting screw rod 95 connected therewith to push the auxiliary compression plate 96 inward, so as to realize the auxiliary sealing work of the wellhead.

[0035] As shown in Figure 1As shown, the blowout preventer 1 is fixedly arranged on the left and right sides below the first protective shell 2, each third protective shell 10 is threadedly connected with a second hydraulic cylinder 11 at the other end, the second hydraulic cylinder 11 is internally provided with a second piston 111, each second hydraulic cylinder 11 is threadedly connected with a second valve cover 12 at the other end, each second valve cover 12 is welded with a fourth protective shell 13 at the other side, each third protective shell 10 is welded with a support plate 14 at the lower section of the side away from the blowout preventer 1, each support plate 14 is welded with a motor bracket 15 at the other end, each motor bracket 15 is internally fixedly installed with a second motor 16 at the upper end, the output end of each second motor 16 is connected with one end of a second locking rod 18 through a shaft coupling 17, the second motor 16 drives the second locking rod 18 to rotate through the shaft coupling 17, so as to realize the automatic locking function, which is beneficial to timely complete the locking work in the event of an emergency, so as to improve the safety. The second locking rod 18 is arranged in the fourth protective shell 13, and the other end of the second locking rod 18 is inserted into the side of the second piston 111, the other side of the second piston 111 is threadedly connected with a second flashboard shaft 19, and the other end of the second flashboard shaft 19 is fixedly connected with a cutoff flashboard 20. The second piston 111 is driven by the hydraulic pressure to move inward, and the second piston 111 drives the cutoff flashboard 20 to move inward through the second flashboard shaft 19 to cut off and seal the oil pipeline.

[0036] As shown in Figure 6 The cutoff flashboard 20 includes a cutoff knife 204, an oil flow channel 201 is formed in the interior of the cutoff knife 204, the oil flow channel 201 leads to a sliding cavity 202 from bottom to top, an auxiliary sealing plate 203 is slidably connected in the sliding cavity 202, and the other end of the auxiliary sealing plate 203 penetrates through the cutoff knife 204 and extends to the center of the blowout preventer 1. After the cutoff sealing is completed, the petroleum below enters the sliding cavity 202 through the oil flow channel 201, extrudes the outer side of the auxiliary sealing plate 203, and pushes the auxiliary sealing plate 203 inward, so as to strengthen the sealing effect of the cutoff flashboard 20.

[0037] In some preferred embodiments, as shown in Figure 1 The first locking rod 6 is threadedly connected with the first valve cover 4 and penetrates through the center of the first valve cover 4, the staff rotates the first locking rod 6 to realize the forward and backward movement of the first locking rod 6 relative to the first valve cover 4, and realizes the locking and unlocking of the driving mechanism.

[0038] In some preferred embodiments, as shown in Figure 7As shown, one end of the first locking rod 6 is provided with a locking gland 61, and a slot hole is formed in the balance lever 7 and matched with the locking gland 61, and the locking gland 61 is not fixed with the balance lever 7. After the wellhead is locked by the locking brake 9 driven by the hydraulic drive, the first brake shaft 8 drives the balance lever 7 to move inward, and then the first locking rod 6 is rotated to lock the blowout prevention drive mechanism, so that the locking gland 61 enters the slot hole of the balance lever 7, and the locking work of the drive mechanism is realized.

[0039] In some preferred embodiments, as shown in the drawings, Figure 1 As shown, the second locking rod 18 passes through the center of the second valve cover 12 and is screwed with the second valve cover 12, the second motor 16 is the power source, the second motor 16 drives the second locking rod 18 to rotate through the shaft coupling 17, realizes the inward pushing of the second locking rod 18 relative to the second valve cover 12, and realizes the automatic locking work of the cutting brake 20.

[0040] In some preferred embodiments, as shown in the drawings, Figure 5 As shown, the locking brake 9 is T-shaped in side view, and a slot hole matched with the wellhead is formed in the end of the locking brake 9 close to the blowout preventer 1. The auxiliary compression plate 96 also has a slot hole matched with the wellhead in the end close to the blowout preventer 1, so as to ensure that the locking brake 9 and the auxiliary compression plate 96 are tightly fitted with the wellhead, and good sealing and blowout prevention effect is achieved.

[0041] In some preferred embodiments, as shown in the drawings, Figure 1 As shown, the first brake shaft 8 is composed of a larger cylindrical shaft part and a smaller screw part, the smaller screw part is screwed with the balance lever 7 and passes through the center of the first piston 31, and the end of the balance lever 7 screwed with the first brake shaft 8 abuts against the outside of the first piston 31, and a small section of the larger cylindrical shaft part connected with the smaller screw part is inserted into the inside of the first piston 31, which is beneficial to realize the movement of the first brake shaft 8 driven by the first piston 31.

[0042] In some preferred embodiments, the slot hole of the auxiliary compression plate 96 is also provided with a pressure sensor, and the pressure sensor, the first motor 92 and the second motor 16 are signal connected with the control system.

[0043] In some preferred embodiments, the control of the locking brake 9 by the control system also includes the following control methods:

[0044] 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 towards the inside 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 attached to the wellhead, then the control system controls the first motor 92 to start, the first motor 92 rotates in the positive direction to drive the first gear 93 to rotate, because the first gear 93 is engaged with the second gear 94, the second gear 94 rotates synchronously with the first gear 93, the rotation of the second gear 94 drives the connecting screw 95 connected with it by threads to drive the auxiliary compression plate 96 to push inward, when the pressure between the auxiliary compression plate 96 and the wellhead is set to a to b, the auxiliary compression plate 96 tightly seals the wellhead without causing damage to the parts due to excessive pressure, and the actual pressure value received by the pressure sensor is c;

[0045] When c is less than a, the control system controls the first motor 92 to continue to rotate in the positive direction, so that the connecting screw 95 continues to drive the auxiliary compression plate 96 to push inward, until c is greater than or equal to a, the control system controls the first motor 92 to stop running;

[0046] When c is greater than a and less than b, the control system controls the first motor 92 to stop running;

[0047] 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 compression plate 96 to move outward, until c is less than or equal to b, the control system controls the first motor 92 to stop running.

[0048] In some preferred embodiments, the control of the control system on the cutoff gate 20 also includes the following control method:

[0049] When an emergency situation such as blowout, fire or leakage occurs at the work site, it is necessary to quickly cut off the oil pipeline to prevent the situation from getting worse, at this time the control system controls the hydraulic oil to enter the second hydraulic cylinder 11, at the same time the second piston 111 pushes the second gate shaft 19 to drive the cutoff gate 20 to move inward, at the same time the control system controls the second motor 16 to start positive rotation, the second motor 16 drives the second locking rod 18 to rotate through the shaft coupling 17, the second locking rod 18 pushes inward at the same speed as the second piston 111 moves inward, to automatically synchronize the locking work, the cutoff knife 204 cuts off the oil pipeline, at the same time the petroleum below the cutoff knife 204 enters the sliding cavity 202 through the oil flow channel 201, extruding the outside of the auxiliary sealing plate 203, so that the auxiliary sealing plate 203 is pushed inward, strengthening the sealing effect of the cutoff gate 20.

[0050] In the description of the present application, it should be understood that the terms "upper", "lower", "front", "back", "left", "right", etc. indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the present application, and do not indicate or imply that the device or element referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as a limitation on the present application.

[0051] Finally, it should be pointed out that: the above examples are only used to illustrate the technical solutions of the present application, and are not limited thereto. Although the present application has been described in detail with reference to the foregoing examples, those skilled in the art should understand that: it can still modify the technical solutions recorded in the foregoing examples, or make equivalent replacement for part of the technical features, and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the spirit and scope of the technical solutions of the embodiments of the present application.

Claims

1. A hydraulic drive of a blowout preventer, comprising a blowout preventer (1) and a control system, characterized in that, The left and right sides of the blowout preventer (1) are fixedly provided with first protective shells (2), one end of each first protective shell (2) is threadedly connected with a first hydraulic cylinder (3), the inside of each first hydraulic cylinder (3) is provided with a first piston (31), the other end of each first hydraulic cylinder (3) is threadedly connected with a first valve cover (4), the other side of each first valve cover (4) is welded with a second protective shell (5), the inside of each second protective shell (5) is provided with a first locking rod (6), one end of each first locking rod (6) close to the blowout preventer (1) is provided with a balance rod (7), the other end of each balance rod (7) is threadedly connected with a first flashboard shaft (8), the other end of each first flashboard shaft (8) is fixedly connected with a locking flashboard (9), one side of the locking flashboard (9) is provided with a blind groove (97), the blind groove (97) is welded with a motor sleeve (91), the inside of the motor sleeve (91) is fixedly installed with a first motor (92), the output end of the first motor (92) is sleeved with a first gear (93), the upper and lower sides of the first gear (93) are engagedly connected with a second gear (94), the center of each second gear (94) is threadedly connected with a connecting screw rod (95), one end of each connecting screw rod (95) close to the center of the blowout preventer (1) is fixedly connected with an auxiliary pressing plate (96). The blowout preventer (1) is fixedly arranged on the left and right sides below the first protective shell (2), a second hydraulic cylinder (11) is threadedly connected to the other end of each third protective shell (10), a second piston (111) is arranged in each second hydraulic cylinder (11), a second valve cover (12) is threadedly connected to the other end of each second hydraulic cylinder (11), a fourth protective shell (13) is welded to the other side of each second valve cover (12), a support plate (14) is welded to the lower section of the side of each third protective shell (10) away from the blowout preventer (1), a motor bracket (15) is welded to the upper end of the other end of each support plate (14), a second motor (16) is fixedly installed in the upper end of each motor bracket (15), one end of a second locking rod (18) is connected to the output end of each second motor (16) through a shaft coupling (17), the second locking rod (18) penetrates the fourth protective shell (13), the other end of the second locking rod (18) is inserted into the side of the second piston (111), a second gate shaft (19) is threadedly connected to the other side of the second piston (111), a cutoff gate (20) is fixedly connected to the other end of the second gate shaft (19), the cutoff gate (20) comprises a cutoff knife (204), an oil flow channel (201) is formed in the cutoff knife (204), the oil flow channel (201) leads to a sliding cavity (202) from bottom to top, an auxiliary sealing plate (203) is slidably connected in the sliding cavity (202), the other end of the auxiliary sealing plate (203) penetrates the cutoff knife (204) and extends to the center of the blowout preventer (1).

2. A hydraulic drive for a blowout preventer according to claim 1, wherein, The first locking rod (6) is threadedly connected with the first valve cover (4) and penetrates the center of the first valve cover (4), the staff rotates the first locking rod (6) to realize the forward and backward movement of the first locking rod (6) relative to the first valve cover (4), and realizes the locking and unlocking of the driving mechanism.

3. A hydraulic drive for a blowout preventer according to claim 2, wherein, One end of the first locking rod (6) is provided with a locking gland (61), a groove is formed in the balance bar (7) and matched with the locking gland (61), and the locking gland (61) and the balance bar (7) are not fixed with each other, which is beneficial to the locking work of the staff on the driving mechanism after the locking gate (9) is driven by the hydraulic drive to lock the wellhead, the first gate shaft (8) drives the balance bar (7) to move inward, and then the first locking rod (6) is rotated to lock the blowout preventer driving mechanism, so that the locking gland (61) enters the groove in the balance bar (7), and the locking work of the staff on the driving mechanism is realized.

4. The hydraulic drive for a blowout preventer of claim 3, wherein, The second locking rod (18) passes through the center of the second valve cover (12) and is screwed with the second valve cover (12), the second motor (16) is the power source, the second motor (16) drives the second locking rod (18) to rotate through the shaft coupling (17), realizes the second locking rod (18) to push inward relative to the second valve cover (12), realizes the automatic locking work of the cutting gate (20).

5. A hydraulic drive for a blowout preventer according to claim 4, wherein, The locking gate (9) is T-shaped structure in side view, the locking gate (9) is provided with a slot opening adapted to the wellhead at one end close to the blowout preventer (1), the auxiliary compression plate (96) is also provided with a slot opening adapted to the wellhead at one end close to the blowout preventer (1), to ensure that the locking gate (9) and the auxiliary compression plate (96) are tightly fitted with the wellhead, and good sealing blowout prevention effect is achieved.

6. A hydraulic drive for a blowout preventer according to claim 5, wherein, The first gate shaft (8) is composed of a larger cylindrical shaft part and a smaller screw part, the smaller screw part is screwed with the balance bar (7) and passes through the center of the first piston (31), and the larger cylindrical shaft part is connected with the smaller screw part and is inserted into the inside of the first piston (31).

7. A hydraulic drive for a blowout preventer according to claim 6, wherein, The inner surface of the slot of the auxiliary compression plate (96) is also provided with a pressure sensor, the pressure sensor, the first motor (92) and the second motor (16) are signal connected with the control system.

8. The hydraulic drive for a blowout preventer of claim 7, wherein, The control of the control system on 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), the hydraulic oil pushes the first piston (31) to slide towards the inside close to 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, the first motor (92) drives the first gear (93) to rotate, because the first gear (93) is engaged with the second gear (94), the second gear (94) rotates synchronously with the first gear (93), the rotation of the second gear (94) drives the connecting screw (95) connected with it to push the auxiliary compression plate (96) inward, when the pressure between the auxiliary compression plate (96) and the wellhead is set to a to b, the auxiliary compression plate (96) tightly seals the wellhead without the phenomenon of part damage 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, so that the connecting screw (95) continues to drive the auxiliary compression plate (96) to push inward, until c is greater than or equal to a, the first motor (92) is controlled to stop running; When c is greater than a and 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 rod (95) pulls the auxiliary compression plate (96) to move outward until c is less than or equal to b, and the first motor (92) is controlled to stop running.

9. A hydraulic drive for a blowout preventer according to claim 8, wherein, The control system for controlling the cutting-off gate (20) further includes the following control method: When an emergency situation such as blowout, fire or leakage occurs in the work site, it is necessary to quickly cut off the oil pipeline to prevent the situation from getting worse. 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 cutting-off gate (20) to move inward, and controls the second motor (16) to start forward rotation. The second motor (16) drives the second locking rod (18) to rotate through the shaft coupling (17), and the second locking rod (18) pushes inward at the same speed as the second piston (111) moves inward, to realize automatic synchronization and complete the locking work. The cutting-off knife (204) cuts off the oil pipeline, and at the same time, the petroleum below the cutting-off knife (204) enters the sliding cavity (202) through the oil flow channel (201), extrudes the outer side of the auxiliary sealing plate (203), and pushes the auxiliary sealing plate (203) inward, thereby strengthening the sealing effect of the cutting-off gate (20).

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