A locking device for a ram blowout preventer

Abstract

The present invention discloses a locking device for a gate blowout preventer, relating to the technical field of gate blowout preventers, comprising: a gate shaft, a first boss being provided on the outer circumference of the gate shaft; a self-locking mechanism, comprising a locking sleeve, a locking rod, a wedge, a locking seat, and a locking rod axial pusher, wherein the locking rod and the locking sleeve are threadedly connected to form a threaded secondary structure; a second boss being provided on the outer circumference of the locking sleeve; a first rotating member or a smooth layer being provided between the locking sleeve and the gate shaft; a driving block being capable of driving the locking sleeve and the gate shaft; the driving block being capable of causing the wedge to be radially squeezed, pushed, or released along the locking sleeve to frictionally lock or loosen the locking sleeve; a friction surface of the locking seat being capable of abutting against the second end face of the locking rod to lock the locking sleeve; a locking rod axial pusher being provided on the first end side or the circumferential step of the locking rod near the side end of the gate shaft to limit the locking rod from moving toward the gate shaft; and a second rotating member or a smooth layer being provided between the locking rod axial pusher and the locking rod. The present invention is compact and lightweight, and has a self-locking function.

Description

Technical Field

[0001] The invention relates to the technical field of ram blowout preventers, in particular to a locking device for a ram blowout preventer. Background Art

[0002] The gate blowout preventer is an important drilling access equipment involved in safety during oil drilling and well repair operations. After the gate blowout preventer is hydraulically closed, it needs to be mechanically locked to ensure safety. The locking methods currently used for the gate blowout preventer are manual locking and hydraulic locking. Manual locking is simple and reliable, but a manual locking operating mechanism needs to be installed on site. Due to the large diameter and high pressure level of the blowout preventer group, it is very high, and the installation of the manual locking operating mechanism is very inconvenient. Manual locking and closing is also very time-consuming and labor-intensive, with high labor intensity and slow response time, which is not conducive to safe production. The hydraulic locking devices for blowout preventers currently produced at home and abroad mainly include several common types, such as long wedge rod type, screw gear clutch type, and wedge block type.

[0003] Long wedge-type locking devices offer reliable locking, but they are bulky and often difficult to unlock after locking. The locking parts are susceptible to wear, reducing their reliability. Screw-sprocket clutch locking devices have a complex structure and, due to mechanical limitations, have discontinuous locking positions. They also have poor rigidity after locking and are prone to wear on the clutch sprocket.

[0004] Therefore, how to provide a gate blowout preventer locking device that is small in size, light in weight, and has a self-locking function is a problem that needs to be solved urgently by those skilled in the art. Summary of the Invention

[0005] In view of this, the present invention proposes a ram blowout preventer locking device, which aims to solve the above technical problems. The ram blowout preventer locking device proposed in the present invention has the advantages of small size, light weight and self-locking function.

[0006] In order to achieve the above object, the present invention adopts the following technical solutions:

[0007] A locking device for a ram blowout preventer, comprising:

[0008] A gate shaft, wherein a boss 1 is provided on the outer peripheral side of the first end of the gate shaft;

[0009] The self-locking mechanism includes a locking sleeve, a locking rod, a wedge, a locking seat and an axial pushing member of the locking rod, wherein the first end of the locking rod is threadedly connected to the first end of the locking sleeve to form a threaded secondary structure; a second boss is provided on the outer peripheral side of the second end of the locking sleeve; the second end face of the locking sleeve is arranged opposite to the first end face of the gate shaft and a rotating member or a smooth layer structure is provided between them; the end face of the second boss close to the gate shaft is an inclined surface;

[0010] A driving mechanism, wherein the driving mechanism includes a driving block, wherein the driving block is provided with a guide through hole 1 along the axial direction of the gate shaft, and a groove is provided in the guide through hole 1; the first end of the gate shaft and the second end of the locking sleeve are both located in the guide through hole 1, and the boss 1 and the boss 2 are both located in the groove; the distance between the two side surfaces of the boss 1 and the boss 2 that are away from each other along the axial direction of the gate shaft is smaller than the length of the groove along the axial direction of the gate shaft; when the driving block moves axially along the gate shaft, the side wall of the groove can abut against the corresponding side wall of the boss 1 or the boss 2 to drive the locking sleeve and the gate shaft;

[0011] The wedge block is arranged between the second inclined surface of the boss, the first end surface of the gate shaft and the bottom surface of the groove, and the wedge block is correspondingly slidably abutted against the second inclined surface of the boss, the first end surface of the gate shaft and the bottom surface of the groove, and the bottom surface of the groove and the wedge block are arranged at a position opposite to the wedge block and inclined surface 1 that is inclined relative to the axial direction of the gate shaft toward the second end of the gate shaft; when the driving block moves axially along the gate shaft, the wedge block can be pressed, pushed or released along the radial direction of the locking sleeve through the inclined surface 1, so as to frictionally lock or loosen the locking sleeve;

[0012] The friction surface of the locking seat is opposite to the second end surface of the locking rod and is in contact with or spaced apart from the second end surface. When the locking sleeve is in a locked state and receives a reverse force from the gate shaft, it pushes the locking rod so that the second end surface of the locking rod abuts against the friction surface of the locking seat, thereby locking the rotation.

[0013] The locking rod axial pushing piece is arranged on the first end side of the locking rod to limit the locking rod from moving toward the side of the gate shaft; or the locking rod axial pushing piece is arranged on the side step of the locking rod close to the side end of the gate shaft to limit the locking rod from moving toward the side of the gate shaft; a rotating part or a smooth layer structure is provided between the locking rod axial pushing piece and the opposite side surfaces of the locking rod along the axial direction to enable the locking rod to rotate freely around the axial direction relative to the locking rod axial pushing piece.

[0014] The cam is pressed against the locking member when the cam is in a position to move relative to the first end of the cam, and the cam is then pressed against the locking member when the cam is in a position to move relative to the first end of the cam. When the cam is in a locked position, the locking sleeve and the locking rod are pressed together, and the cam is pressed against the locking rod, and the cam is locked. When the drive block moves along the axial direction of the gate shaft from the gate shaft to the locking sleeve, the inclined surface 1 of the groove can release the wedge block in the squeezed state, and when the drive block pushes the boss 1 through the side wall of the groove, the released wedge block will move along the inclined surface 2 of the boss away from the locking sleeve under the thrust of the gate shaft and lose the friction locking rotation effect on the locking sleeve; then the first end face of the gate shaft abuts against the corresponding end face of the locking sleeve and pushes the locking sleeve to move, and the locking sleeve pushes the locking rod to abut against the friction surface of the locking seat. The locking rod is still in a rotational locking state, but the rotating member 1 or smooth layer structure provided between the first end face of the gate shaft and the corresponding end face of the locking sleeve does not restrict the rotation of the locking sleeve; under the driving action of the driving force of the gate shaft and the threaded structure of the threaded pair, the locking sleeve rotates, and the length of the threaded pair structure is shortened, thereby smoothly realizing the movement of the gate shaft. The present invention utilizes the telescopic and locking characteristics of the threaded pair structure to realize the self-locking function of the locking device, and has the advantages of small size and light weight.

[0015] As a further improvement of the above technical solution,

[0016] The driving mechanism also includes a side door, a cylinder sleeve and a cylinder cover;

[0017] The side door and the cylinder cover are respectively arranged at the two ends of the cylinder sleeve to form a sealed cylinder body;

[0018] The circumferential wall of the gate shaft is sealed against an inner wall of the guide through hole, and the circumferential wall of the drive block is sealed against an inner wall of the cylinder sleeve to form a piston structure, and the interior of the cylinder sleeve is divided into a first chamber and a second chamber by the drive block;

[0019] The cylinder head is provided with a closed oil passage passing through the first chamber, and the side door is provided with an open oil passage passing through the second chamber;

[0020] The side door is provided with a second guide hole corresponding to the gate shaft for guiding the movement of the gate shaft, and the outer wall of the gate shaft abuts against and seals against the inner wall of the second guide hole;

[0021] The oil cylinder cover is provided with a third guide through hole corresponding to the locking sleeve for guiding the movement of the locking sleeve, and the outer wall of the locking sleeve abuts against and seals the inner wall of the third guide through hole.

[0022] A hydraulic drive system is constructed through the structure of a side door, a cylinder sleeve, a cylinder cover and a drive block; by closing the oil channel and injecting hydraulic oil into the first chamber, the drive block can be driven to move along the axial direction of the gate shaft from the locking sleeve to the gate shaft; by opening the oil channel and injecting hydraulic oil into the second chamber, the drive block can be driven to move along the axial direction of the gate shaft from the gate shaft to the locking sleeve.

[0023] As a further improvement of the above technical solution,

[0024] The locking sleeve is provided with a clutch disc adapted to the locking sleeve on two circumferential sides corresponding to the boss, and the outer wall of the clutch disc is provided with an outer conical surface of the clutch disc; the wall surface of the wedge block corresponding to the outer conical surface of the clutch disc is provided with an adapted inclined surface 2;

[0025] A wear-resistant ring is fixed to the side wall of the gate shaft opposite to the wedge block, the wear-resistant ring is sleeved on the second end of the locking sleeve, and the inner wall of the wear-resistant ring and the outer wall of the locking sleeve are radially spaced apart;

[0026] The wedge block is close to the wall surface of the locking sleeve and is spaced apart from the outer wall of the locking sleeve.

[0027] The clutch disc can enhance the friction locking effect of the locking sleeve; the wear-resistant ring can protect the end face of the gate shaft to avoid wear.

[0028] As a further improvement of the above technical solution, there are multiple wedge blocks, and the multiple wedge blocks are distributed at intervals along the circumference of the clutch disc.

[0029] Multiple wedges improve the friction locking effect while ensuring accurate positioning when the locking sleeve is rotated and locked.

[0030] As a further improvement of the above technical solution, the self-locking mechanism further includes a locking seat ring; the locking rod axial pushing member includes a push rod and a push rod seat;

[0031] The locking seat is fixed to the side end of the oil cylinder cover away from the side door; the end surface of the locking seat close to the side door is provided with a mounting hole corresponding to the locking rod;

[0032] The locking seat ring is fixedly installed at the bottom of the mounting hole, and the second end of the locking rod is inserted into the mounting hole and close to the locking seat ring; the second end of the locking rod is provided with an outer conical surface of the locking rod, and the locking seat ring is provided with an inner conical surface of the locking seat ring that is adapted to and in contact with or has a gap with the outer conical surface of the locking rod; the outer wall surface of the locking seat is provided with an observation hole connected to the mounting hole;

[0033] The first end surface of the locking rod is provided with a second mounting groove, the push rod seat is movably arranged in the second mounting groove, and a second rotating member is arranged between the push rod seat and the bottom of the second mounting groove;

[0034] The push rod is fixedly connected to the side of the push rod seat away from the second rotating part, and the push rod is axially arranged along the locking rod; the locking sleeve is provided with a through hole corresponding to the push rod, and the gate shaft is provided with an insertion hole corresponding to the push rod; the push rod is movably arranged in the through hole along its axial direction, and a seal is provided between the outer wall of the push rod and the inner wall of the through hole; the push rod is inserted into the insertion hole at one end away from the push rod seat, and has a preset interval with the bottom surface of the insertion hole, and a gap is provided between the inner wall of the insertion hole and the corresponding outer wall of the push rod.

[0035] When the inner conical surface of the locking seat ring abuts the outer conical surface of the locking rod, the inner conical surface of the locking seat ring can frictionally lock the locking rod to limit its rotation; the first chamber and the insertion hole are connected through the gaps of the mating parts, and the hydraulic pressure can be transmitted to the insertion hole, thereby generating an axial thrust on the push rod, thereby realizing the axial movement restriction of the locking rod by the push rod through the push rod seat and the rotating part two, and the rotating part two can realize the sliding between the push rod seat and the locking rod contact surface, that is, the locking rod realizes the axial rotation freedom relative to the push rod seat.

[0036] As a further improvement of the above technical solution, the driving block includes an annular piston and an annular gland;

[0037] The annular piston and the annular gland are axially opposed and fixedly connected; the annular piston and the annular gland are both provided with a stepped hole axially on opposite sides thereof, the stepped hole of the annular piston having a larger diameter than the stepped hole of the annular gland; the internal spaces of the fixedly connected annular piston and the annular gland jointly define the first guide hole and the groove;

[0038] The boss 1 is located in the stepped hole of the annular piston, and the outer wall surface of the boss 1 is slidably arranged with the inner wall surface of the stepped hole of the annular piston; the boss 2 is located in the stepped hole of the annular gland, and the inner wall surface of the stepped hole of the annular gland corresponding to the boss 2 is set as the inclined surface 1;

[0039] The inner wall of the annular hole of the annular piston is sealed against the circumferential wall of the gate shaft, and the circumferential wall of the annular piston is sealed against the inner wall of the cylinder sleeve to form a piston structure, and the interior of the cylinder sleeve is divided into the first chamber and the second chamber by the annular piston;

[0040] The locking sleeve is inserted into the annular hole of the annular gland, and the outer wall of the locking sleeve is clearance-matched with the inner wall of the annular hole.

[0041] The diameter of the stepped hole of the annular piston is larger than that of the stepped hole of the annular gland, and the stepped hole of the annular piston reserves space for releasing the wedge block.

[0042] As a further improvement of the above technical solution, the first rotating member and the second rotating member are both thrust bearings.

[0043] It can be seen from the above technical solutions that, compared with the prior art, the present invention provides a ram blowout preventer locking device having the following advantages and beneficial effects:

[0044] 1. The ram BOP locking device of the present invention can be hydraulically driven to open and close the BOP and has a mechanical self-locking function, that is, after the BOP is closed, the mechanical self-locking state can be maintained even when the hydraulic driving force is removed. In the mechanical self-locking state, the self-locking state can be released by hydraulic drive to open the BOP.

[0045] 2. The ram blowout preventer locking device of the present invention utilizes the rotation and extension function of the threaded pair structure in the non-self-locking state and the characteristics of friction locking to achieve automatic locking and automatic unlocking under hydraulic drive without manual operation. BRIEF DESCRIPTION OF THE DRAWINGS

[0046] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are merely embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on the provided drawings without paying any creative work.

[0047] Figure 1 A schematic cross-sectional view of the locking device of the ram blowout preventer of the present invention when closed;

[0048] Figure 2An enlarged schematic diagram of the local structure of the ram blowout preventer locking device of the present invention when it is closed;

[0049] Figure 3 A schematic cross-sectional view of the locking device of the ram blowout preventer of the present invention when it is opened;

[0050] Figure 4 An enlarged schematic diagram of the local structure of the ram blowout preventer locking device of the present invention when it is opened;

[0051] Figure 5 Schematic diagram of the decomposition structure of the present invention.

[0052] In the figure: 1. Side door; 101. Opening oil passage; 102. Second guide hole; 2. Annular piston; 201. Annular hole 1; 202. Stepped hole 1; 3. Gate shaft; 301. Boss 1; 302. Mounting groove 1; 303. Insert hole; 4. Annular gland; 401. Inclined surface 1; 402. Annular hole 2; 403. Stepped hole 2; 5. Cylinder liner; 501. First chamber; 502. Second chamber; 6. Wedge; 601. Oblique outer cylindrical surface; 7. Thrust bearing A; 701. Bearing end face; 8. Clutch plate; 801. Outer conical surface of clutch plate; 802. Inner conical surface of clutch plate; 9. Locking sleeve; 901. Shoulder surface of locking sleeve ;902, outer conical surface of locking sleeve;903, boss two;904, through hole;10, first screw;11, cylinder cover;1101, close oil channel;1102, guide through hole three;12, bolt;13, second screw;14, locking seat;1401, mounting hole;1402, observation hole;15, locking rod;1501, outer conical surface of locking rod;1502, mounting groove two;1503, step;16, thrust bearing B;17, wire retaining ring;18, push rod;19, push rod seat;20, wear-resistant ring;21, third screw;22, locking seat ring;2201, inner conical surface of locking seat ring;23, wire locking ring. DETAILED DESCRIPTION

[0053] The following describes embodiments of the present invention in detail, examples of which are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are intended to be used to explain the present invention, and are not to be construed as limiting the present invention.

[0054] In the description of the present invention, it should be understood that the terms "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", 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 simplifying the description, rather than indicating or implying that the device or element referred to must have a specific direction, be constructed and operated in a specific direction, and therefore should not be understood as limiting the present invention.

[0055] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of the technical features being referred to. Thus, a feature identified as "first" or "second" may explicitly or implicitly include one or more of the features. In the description of the present invention, "plurality" means two or more, unless otherwise specifically defined.

[0056] In the present invention, unless otherwise expressly specified or limited, the terms "mounted," "connected," "connect," "fixed," etc. should be understood broadly. For example, they may refer to fixed connection, detachable connection, or integration; mechanical connection or electrical connection; direct connection or indirect connection through an intermediate medium; internal communication between two components or interaction between two components. Those skilled in the art will understand the specific meanings of the above terms in the present invention based on specific circumstances.

[0057] like Figures 1 to 5 As shown, a locking device for a ram blowout preventer includes:

[0058] The gate shaft 3, the outer peripheral side of the first end of the gate shaft 3 is provided with a boss 1 301;

[0059] Self-locking mechanism, the self-locking mechanism includes a locking sleeve 9, a locking rod 15, a wedge 6, a locking seat 14 and an axial pushing piece of the locking rod; the first end of the locking rod 15 is threadedly connected to the first end of the locking sleeve 9 to form a threaded pair structure, that is, the rod body of the locking rod 15 is provided with an external thread, and the internal tail end of the locking sleeve 9 is provided with a section of internal thread, and the locking rod 15 is correspondingly screwed into the locking sleeve 9; the threaded pair structure formed by the threaded connection between the locking sleeve 9 and the locking rod 15 adopts a non-self-locking multi-start large-lead thread pair connection; the outer peripheral side of the second end of the locking sleeve 9 is integrally connected with a boss 2 903; the second end face of the locking sleeve 9 is arranged opposite to the first end face of the gate shaft 3 and a rotating part 1 or a smooth layer structure is provided between them; the end face of the boss 2 903 close to the gate shaft 3 is an inclined surface;

[0060] According to the self-locking theory of thread pairs, the self-locking condition of thread pairs is that the thread lead angle is less than or equal to the friction angle or equivalent friction angle of the helical pair. The multi-start, large-lead thread pair in which the locking sleeve 9 and the locking rod 15 cooperate with each other in the present invention has the following characteristics: when the thread pair is subjected only to the internal friction resistance torque between its own thread surfaces, the thread pair can be in a non-self-locking state. During movement, if one of the locking sleeve 9 and the locking rod 15 is subjected only to the axial thrust of the rotating part 1 or the smooth layer structure, since the friction resistance torque of the rotating part 1 or the smooth layer structure is very small and negligible, the rotating part 1 or the smooth layer structure hardly restricts the axial rotation of the thread pair structure, that is, one of the locking sleeve 9 and the locking rod 15 can rotate under the axial force of the rotating part 1 or the smooth layer structure, and the length of the thread pair structure is extended or shortened; when the thread pair structure is subjected to a relatively small internal friction resistance torque and the locking sleeve 9 and the locking rod 15 are both subjected to a relatively large external friction resistance torque in addition to the small internal friction resistance torque of the thread pair, the thread pair can be in a locked state, that is, the locking sleeve 9 and the locking rod 15 do not rotate relative to each other, and the length of the thread pair structure is locked and unchanged.

[0061] The driving mechanism includes a driving block, which is provided with a guide through hole 1 along the axial direction of the gate shaft 3, and a groove is provided in the guide through hole 1; the first end of the gate shaft 3 and the second end of the locking sleeve 9 are both located in the guide through hole 1, and the boss 1 301 and the boss 2 903 are both located in the groove; the distance between the two side surfaces of the boss 1 301 and the boss 2 903 that are separated from each other along the axial direction of the gate shaft 3 is less than the length of the groove along the axial direction of the gate shaft 3; when the driving block moves axially along the gate shaft 3, the side wall of the groove can abut against the side wall of the corresponding boss 1 301 or boss 2 903 to drive the locking sleeve 9 and the gate shaft 3 to move;

[0062] The wedge block 6 is arranged between the inclined surface of the second boss 903, the first end surface of the gate shaft 3 and the bottom surface of the groove, and the wedge block 6 is in sliding contact with the inclined surface of the second boss 903, the first end surface of the gate shaft 3 and the bottom surface of the groove. The bottom surface of the groove and the wedge block 6 are opposite to each other and are provided with an inclined surface 1 401 that is inclined relative to the axial direction of the gate shaft 3 toward the second end of the gate shaft 3; when the driving block moves axially along the gate shaft 3, the wedge block 6 can be pushed or released radially along the locking sleeve 9 through the inclined surface 1 401, so as to frictionally lock or loosen the locking sleeve 9;

[0063] The friction surface of the locking seat 14 is opposite to the second end surface of the locking rod 15 and is in contact or spaced apart. When the locking sleeve 9 is in the locked state and receives the reverse force from the gate shaft 3, it pushes the locking rod 15 so that the second end surface of the locking rod 15 abuts against the friction surface of the locking seat 14, thereby locking the rotation.

[0064] The locking rod axial pushing piece is arranged on the first end side of the locking rod 15 to limit the locking rod 15 from moving toward the side of the gate shaft 3; or the locking rod axial pushing piece is arranged on the circumferential step 1503 of the locking rod 15 close to the side end of the gate shaft 3 to limit the locking rod 15 from moving toward the side of the gate shaft 3; a rotating part 2 or a smooth layer structure is provided between the locking rod axial pushing piece and the opposite side surfaces of the locking rod 15 along the axial direction to enable the locking rod 15 to rotate freely around the axial direction relative to the locking rod axial pushing piece.

[0065] Specifically, the smooth layer structure may be a lubricating oil film layer.

[0066] Preferably, the driving mechanism further includes a side door 1, a cylinder sleeve 5, and a cylinder cover 11;

[0067] The side door 1 and the cylinder cover 11 are respectively arranged at the two ends of the cylinder sleeve 5 to form a closed cylinder body; the cylinder cover 11, the cylinder sleeve 5 and the side door 1 are fixed together by a plurality of bolts 12 distributed in a circumferential array;

[0068] The peripheral wall of the gate shaft 3 is sealed against the inner wall of the guide through hole, and the peripheral wall of the driving block is sealed against the inner wall of the cylinder sleeve 5 to form a piston structure. The interior of the cylinder sleeve 5 is divided into a first chamber 501 and a second chamber 502 by the driving block.

[0069] The cylinder head 11 is provided with a closed oil passage 1101 penetrating the first chamber 501 , and the side door 1 is provided with an open oil passage 101 penetrating the second chamber 502 ;

[0070] The side door 1 is provided with a second guide hole 102 corresponding to the gate shaft 3 for guiding the movement of the gate shaft 3. The outer wall of the gate shaft 3 abuts against the inner wall of the second guide hole 102 and is sealed.

[0071] The oil cylinder cover 11 is provided with a third guide hole 1102 corresponding to the locking sleeve 9 for guiding the movement of the locking sleeve 9 . The outer wall of the locking sleeve 9 abuts against the inner wall of the third guide hole 1102 and is sealed.

[0072] A hydraulic drive system is constructed through the structure of the side door 1, the cylinder sleeve 5, the cylinder cover 11 and the drive block; by closing the oil channel 1101 and injecting hydraulic oil into the first chamber 501, the drive block can be driven to move along the axial direction of the gate shaft 3 from the locking sleeve 9 to the gate shaft 3; by opening the oil channel 101 and injecting hydraulic oil into the second chamber 502, the drive block can be driven to move along the axial direction of the gate shaft 3 from the gate shaft 3 to the locking sleeve 9.

[0073] Preferably, the driving block can also be driven to move by other design schemes. For example, by using an existing hydraulic cylinder, the hydraulic rod of the hydraulic cylinder is fixedly connected to the outer wall of the driving block along the axial direction of the gate shaft 3 to drive the driving block to move axially along the gate shaft 3; or by using an existing electric telescopic rod, the telescopic rod is fixedly connected to the outer wall of the driving block along the axial direction of the gate shaft 3 to drive the driving block to move axially along the gate shaft 3.

[0074] Preferably, a clutch disc 8 that matches the locking sleeve 9 is sleeved on the outer side of the locking sleeve 9 corresponding to the circumference of the second boss 903; the end surface of the second boss 903 close to the gate shaft 3 is a conical surface, called the locking sleeve outer conical surface 902, and the inner wall of the clutch disc 8 has a clutch disc inner conical surface 801 that matches the locking sleeve outer conical surface 902; the outer wall of the clutch disc 8 has a clutch disc outer conical surface 802; the wall surface of the wedge block 6 corresponding to the clutch disc outer conical surface 802 is an inclined surface 2 602 that matches the clutch disc outer conical surface 802, that is, the inclined surface 2 602 is a conical surface structure;

[0075] A wear-resistant ring 20 is fixed to the side wall of the gate shaft 3 opposite to the wedge 6 by a third screw 21. The wear-resistant ring 20 is sleeved on the second end of the locking sleeve 9. The inner wall of the wear-resistant ring 20 and the outer wall of the locking sleeve 9 are spaced radially to prevent the wear-resistant ring 20 from contacting the outer wall of the locking sleeve 9.

[0076] There is a gap between the wall surface of the wedge block 6 close to the locking sleeve 9 and the corresponding outer wall surface of the locking sleeve 9, which reserves enough space for the wedge block 6 to move radially along the locking sleeve 9.

[0077] The clutch disc 8 can enhance the friction locking effect of the locking sleeve 9; the wear-resistant ring 20 can protect the end face of the gate shaft 3 to avoid wear.

[0078] Preferably, there are three wedge blocks 6 , and the three wedge blocks 6 are evenly spaced along the circumference of the clutch disc 8 .

[0079] The three wedges 6 improve the friction locking effect and ensure that the locking sleeve 9 is accurately positioned when it is rotated and locked.

[0080] Specifically, the three wedge blocks 6 have the same structure, and the outer wall of the clutch disc 8 corresponding to the three wedge blocks 6 has a clutch disc outer conical surface 802 that is compatible with it; the bottom surface of the groove opposite to the three wedge blocks 6 has an inclined surface 401 that is inclined relative to the axial direction of the gate shaft 3 toward the second end of the gate shaft 3.

[0081] Specifically, the three inclined surfaces 401 are all cylindrical or planar structures.

[0082] Preferably, the self-locking mechanism further includes a locking seat ring 22; the locking rod axial pushing member includes a push rod 18 and a push rod seat 19;

[0083] The locking seat 14 is fixed to the side end of the oil cylinder cover 11 away from the side door 1 by the second screw 13; the end surface of the locking seat 14 close to the side door 1 is provided with a mounting hole 1401 corresponding to the locking rod 15;

[0084] The locking seat ring 22 is fixedly installed at the bottom of the mounting hole 1401 by a wire lock ring 23. The second end of the locking rod 15 is inserted into the mounting hole 1401 and is close to the locking seat ring 22. The second end of the locking rod 15 is provided with a locking rod outer conical surface 1501, and the locking seat ring 22 is provided with a locking seat ring inner conical surface 2201 that is adapted to and in contact with or with a gap with the locking rod outer conical surface 1501. The outer wall of the locking seat 14 is provided with an observation hole 1402 connected to the mounting hole 1401. There are two observation holes 1402, which are radially symmetrically arranged on both sides of the outer wall of the locking seat 14. The position and movement state of the locking sleeve 9 can be directly observed through the observation holes 1402.

[0085] A second mounting groove 1502 is formed on the first end surface of the locking rod 15. The push rod seat 19 is movably arranged in the second mounting groove 1502 and is limited by the wire retaining ring 17. A second rotating member is provided between the push rod seat 19 and the bottom of the second mounting groove 1502.

[0086] The push rod 18 is fixedly connected or abutted against the side of the push rod seat 19 away from the rotating part 2, and the push rod 18 is axially arranged along the locking rod 15; the locking sleeve 9 is provided with a through hole 903 corresponding to the push rod 18, and the gate shaft 3 is provided with an insertion hole 303 corresponding to the push rod 18; the push rod 18 is movably arranged in the through hole 903 along its axial direction, and a seal is provided between the outer wall of the push rod 18 and the inner wall of the through hole 903; the push rod 18 is passed through the insertion hole 303 at one end away from the push rod seat 19, and has a preset interval with the bottom surface of the insertion hole 303, and a gap is provided between the inner wall of the insertion hole 303 and the outer wall of the corresponding push rod 18.

[0087] When the inner conical surface 2201 of the locking seat ring abuts against the outer conical surface 1501 of the locking rod, the inner conical surface 2201 of the locking seat ring can frictionally lock the locking rod 15 to limit its rotation; the first chamber 501 is connected to the insertion hole 303 through the gaps between the mating parts, so that the hydraulic pressure can be transmitted to the insertion hole 303, thereby generating an axial thrust on the push rod 18, and realizing the axial movement restriction of the locking rod 15 by the push rod seat 19 and the second rotating part. The second rotating part can realize the sliding between the contact surface of the push rod seat 19 and the locking rod 15, that is, the locking rod 15 is free to rotate axially relative to the push rod seat 19.

[0088] Preferably, the driving block comprises an annular piston 2 and an annular gland 4;

[0089] The annular piston 2 and the annular pressure cover 4 are axially arranged opposite to each other and are fastened together by a first screw 10; the annular piston 2 and the annular pressure cover 4 are both provided with stepped holes axially on opposite sides, and the aperture of the stepped hole 1 202 of the annular piston 2 is larger than the aperture of the stepped hole 2 403 of the annular pressure cover 4; the internal spaces of the fixedly connected annular piston 2 and the annular pressure cover 4 jointly define a guide through hole 1 and a groove, that is, the annular hole 1 201 of the annular piston 2 and the annular hole 2 402 of the annular pressure cover 4 jointly define a guide through hole 1, and the step hole 1 202 of the annular piston 2 and the step hole 2 403 of the annular pressure cover 4 jointly define a groove.

[0090] Boss 1 301 is located in the stepped hole 1 202 of the annular piston 2, and the outer wall surface of boss 1 301 is slidably arranged with the inner wall surface of the stepped hole 1 202 of the annular piston 2; boss 2 903 is located in the stepped hole 2 403 of the annular pressure cover 4, and the inner wall surface of the stepped hole 2 403 of the annular pressure cover 4 is corresponding to boss 2 903 and is set as inclined surface 1 401; inclined surface 1 401 can be a cylindrical surface, and the wall surface of boss 2 903 corresponding to inclined surface 1 401 is set as an inclined outer cylindrical surface 601 that matches the inclined surface 1 401, and the matching of inclined surface 1 401 and the inclined outer cylindrical surface 601 can form a self-locking angle.

[0091] The inclined surface 1 401 may also be a planar structure, and the wall surface of the boss 2 903 corresponding to the inclined surface 1 401 may also be a planar structure;

[0092] The inner wall of the annular hole 201 of the annular piston 2 is sealed against the peripheral wall of the gate shaft 3 via a sealing ring. The peripheral wall of the annular piston 2 is sealed against the inner wall of the cylinder sleeve 5 via a sealing ring to form a piston structure. The interior of the cylinder sleeve 5 is divided into a first chamber 501 and a second chamber 502 by the annular piston 2.

[0093] The locking sleeve 9 is inserted into the second annular hole 402 of the annular gland 4 , and the outer wall of the locking sleeve 9 is gap-fitted with the inner wall of the second annular hole 402 .

[0094] The diameter of the stepped hole 1 202 of the annular piston 2 is larger than the diameter of the stepped hole 2 403 of the annular pressure cover 4 , and the stepped hole 1 202 of the annular piston 2 reserves space for releasing the wedge block 6 .

[0095] Preferably, a thrust bearing A7 can be selected as the rotating part, and a mounting groove 302 for the thrust bearing A7 is milled on the end face of the gate shaft 3 corresponding to the second end of the locking sleeve 9, and the thrust bearing A7 is installed in the mounting groove 302; the second end of the locking sleeve 9 is inserted into the inner hole of the thrust bearing A7 and the clearance is matched; the shoulder surface 901 of the locking sleeve contacts with the bearing end surface 701 of the thrust bearing A7 or retains a matching clearance, and during the movement, the shoulder surface 901 of the locking sleeve can abut against the bearing end surface 701 of the thrust bearing A7.

[0096] Preferably, the second rotating part can use a thrust bearing B16, which is sleeved on the end of the push rod seat 19. The bearing end face of the thrust bearing B16 contacts the bottom surface of the second mounting groove 1502 or retains a fitting clearance. During the movement, the bearing end face of the thrust bearing B16 can abut the bottom surface of the second mounting groove 1502.

[0097] Specifically, the clutch disc 8, the annular pressure cover 4, and the thrust bearing A7 all have a fitting clearance with the locking sleeve 9, and there is a fitting clearance between the inner wall of the insertion hole 303 and the outer wall of the corresponding push rod 18; that is, the first chamber 501 and the insertion hole 303 can be connected through the gaps of each fitting part, that is, the hydraulic pressure of the first chamber 501 can be transmitted to the insertion hole 303, so that the hydraulic oil pressure in the insertion hole 303 generates an axial thrust on the push rod 18.

[0098] Optionally, the locking rod axial pushing member may also be a compression spring (not shown in the figure), with both ends of the compression spring respectively abutting against the bottom wall of the inner hole of the locking sleeve 9 and the end of the locking rod 15.

[0099] Optionally, when the locking rod axial push member uses a compression spring, the compression spring can be sleeved on the push rod 18, and the two ends of the compression spring respectively abut against the bottom wall of the inner hole of the locking sleeve 9 and the first end of the locking rod 15 (not shown in the figure).

[0100] Optionally, the axial thrust member of the locking rod may also be a thrust bearing (not shown in the figure), and the thrust bearing is installed at the circumferential step 1503 of the locking rod 15 away from the gate shaft 3 to limit the movement of the locking rod 15 toward the gate shaft 3; the thrust bearing is axially limited by a retaining ring or a similar structure with the locking seat 14.

[0101] The working principle of the locking device of the ram blowout preventer of the present invention is as follows:

[0102] When the BOP is in the closing process or locked state after closing, the locking sleeve 9, clutch plate 8, and wedge 6 are in a contact and compressed connection with the gate shaft 3 via the wear ring 20. The locking sleeve shoulder surface 901 is separated from the bearing end surface 701 of the thrust bearing A7, and the locking sleeve outer conical surface 902 is compressed with the clutch plate inner conical surface 802. When the BOP is in the unlocked and open state, the locking sleeve 9, clutch plate 8, and wedge 6 are in a loose connection with the gate shaft 3 via the wear ring 20. The locking sleeve shoulder surface 901 is engaged with the bearing end surface 701 of the thrust bearing A7, and the locking sleeve outer conical surface 902 is separated from the clutch plate inner conical surface 802. The locking sleeve 9 and locking rod 15 are connected using a non-self-locking, multi-start, high-lead threaded pair; the locking rod outer conical surface 1501 mates with the locking seat ring inner conical surface 2201. A thrust bearing B16 and a push rod seat 19 are located within the second mounting groove 1502 of the head of the locking rod 15 and are retained by a wire retaining ring 17. One end of the push rod 18 is inserted into the second mounting groove 1502 of the head of the locking rod 15 and engages with the push rod seat 19. The other end of the push rod 18 passes through the locking sleeve 9, clutch plate 8, and thrust bearing A7, and then into the insertion hole 303 of the gate shaft 3. The position and movement of the locking sleeve 9 in the mounting hole 1401 can be directly observed through the observation holes 1402 on both sides of the locking seat 14.

[0103] When the blowout preventer is closed, hydraulic oil enters the first chamber 501 of the cylinder liner 5 through the closed oil passage 1101. The oil pressure acts on the annular gland 4 and the gate shaft 3, pushing the gate shaft 3 forward to close the blowout preventer. Since the annular gland 4 and the annular piston 2 are fastened together as a whole by the first screw 10 and loosely sleeved on the gate shaft 3, the annular gland 4 and the annular piston 2 move forward relative to the gate shaft 3 under the action of the hydraulic pressure. Since the cylindrical inclined surface 401 distributed in the circumferential array in the hole of the annular gland 4 cooperates with the oblique outer cylindrical surface 601 of the wedge 6, the wedge 6 is forced to retract toward the center. The retracted wedge 6 pushes the clutch disc 8 and the locking sleeve 9, so that the locking sleeve shoulder surface 901 is separated from the bearing end surface 701 of the thrust bearing A7. In this state, the locking sleeve 9, the clutch disc 8, the wedge 6 and the gate shaft 3 are in an axially compressed state through the wear-resistant ring 20, while the locking sleeve shoulder surface 901 is separated from the bearing end surface 701 of the thrust bearing A7. When the whole moves forward, the position The push rod 18 in the inner hole of the locking sleeve 9 generates axial thrust under the action of the closing oil pressure. The push rod 18 pushes the locking rod 15 axially through the push rod seat 19 and the thrust bearing B16. Since the friction coefficient of the thrust bearing B16 is extremely low, the threaded pair connecting the locking shaft 15 and the locking sleeve 9 will be in an unlocked state. When the locking sleeve 9 moves axially, the locking rod 15 is driven by the push rod 18 and passively rotates under the drive of the threaded pair in the non-self-locking state, and always keeps the outer conical surface 1501 of the locking rod 15 and the inner conical surface 2201 of the locking seat ring in zero gap contact or a small gap.

[0104] After the BOP is completely closed, if the closing hydraulic pressure disappears, the gate shaft 3 will be subjected to the rebound force of the gate sealing rubber and the pressure of the wellbore medium. This axial force is transmitted from the gate shaft 3 through the wear ring 20, the wedge 6, and the clutch plate 8 to the locking sleeve 9. The locking sleeve 9 then transmits the force to the locking shaft 15 through the threaded pair. The locking shaft outer conical surface 1501 then acts on the inner conical surface 2201 of the locking seat ring, and finally transmits the force to the locking seat 14 through the locking seat ring 20. Because the locking sleeve 9, the clutch plate 8, the wedge 6 and the gate shaft 3 are in an axially compressed state through the wear ring 20 during closing, they cannot rotate. The axial force will cause the wedge 6 to expand outward. Because the oblique outer cylindrical surface 601 of the wedge 6 is constrained by the cylindrical inclined surface 401 of the annular gland 4, and this oblique angle is a self-locking angle. Without the action of hydraulic pressure, the annular gland 4 will not move on its own, nor will the wedge 6. The gate shaft 3 is restrained by the gate and will not rotate, so the entire mechanism will remain stable. The axial force of the locking sleeve 9 is transmitted to the locking rod 15 through the thread side effect. At this time, the locking rod 15 is subjected to an outward axial force, and the outer conical surface 1501 of the locking rod contacts the inner conical surface 2201 of the locking seat ring, generating a large frictional resistance. This frictional resistance puts the threaded pair in a locked rotation state. As a result, the locking rod 15 will not rotate, thereby ensuring that the gate shaft 3 will not undergo axial displacement and achieving mechanical locking of the gate shaft 3.

[0105] When the blowout preventer is opened, the hydraulic oil enters the second chamber of the cylinder sleeve 5 from the open oil passage 101. The pressure oil acts on the annular piston 2. The annular piston 2 and the annular gland 4 move axially backward relative to the gate shaft 3, causing the cylindrical inclined surface 401 distributed in the circumferential array in the hole of the annular gland 4 and the inclined outer cylindrical surface 601 on the wedge 6 to be relatively displaced. Under the axial force of the gate shaft 3, the wedge 6 is guided by the outer conical surface 801 of the clutch disc 8 and expands from the center outward. After the wedge 6 expands outward, the gate shaft 3 and the thrust bearing A7 installed in its mounting groove 302 gradually approach the locking sleeve 9, finally causing the thrust bearing A7 to engage. The bearing end face 701 contacts the locking sleeve shoulder surface 901, and the locking sleeve outer conical surface 902 is in a separated state from the clutch disc inner conical surface 802. At this time, the locking sleeve 9 is no longer in close contact with the clutch disc 8. The axial force of the gate shaft 3 is transmitted to the locking sleeve 9 by the thrust bearing A7. The locking sleeve 9 and the locking rod 15 are connected by a threaded pair. Since the friction coefficient of the thrust bearing A7 is very small and can be ignored, the threaded pair can be regarded as having only its own friction resistance torque. In this case, the threaded pair is in a non-locked state. When the gate shaft 3 moves axially outward, the threaded pair in the non-locked state will drive the locking sleeve 9 to rotate synchronously and passively, thereby realizing the unlocking function.

[0106] In the description of this specification, the reference terms "one embodiment", "some embodiments", "example", "specific example", or "some examples" mean that the specific features, structures, materials, or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present invention. In this specification, the schematic representations of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials, or characteristics described can be combined in any appropriate manner in any one or more embodiments or examples. In addition, those skilled in the art can combine and combine different embodiments or examples described in this specification.

[0107] Although the embodiments of the present invention have been shown and described above, it will be understood that the above embodiments are illustrative and are not to be construed as limitations on the present invention. A person skilled in the art may change, modify, replace and modify the above embodiments within the scope of the present invention.

Claims

1. A locking device for a ram blowout preventer, characterized in that: include: A gate shaft (3), wherein a boss 1 (301) is provided on the outer peripheral side of a first end of the gate shaft (3); A self-locking mechanism, the self-locking mechanism comprises a locking sleeve (9), a locking rod (15), a wedge block (6), a locking seat (14) and an axial pushing member of the locking rod, the first end of the locking rod (15) is threadedly connected to the first end of the locking sleeve (9) to form a threaded substructure; a second boss (903) is provided on the outer peripheral side of the second end of the locking sleeve (9); the second end face of the locking sleeve (9) is arranged opposite to the first end face of the gate shaft (3) and a rotating member (1) or a smooth layer structure is provided between them; the end face of the second boss (903) close to the gate shaft (3) is an inclined surface; A driving mechanism, the driving mechanism comprising a driving block, the driving block being provided with a guide through hole 1 along the axial direction of the gate shaft (3), and the inner wall surface of the guide through hole 1 being provided with a groove; the first end of the gate shaft (3) and the second end of the locking sleeve (9) are both located in the guide through hole 1, and the boss 1 (301) and the boss 2 (903) are both located in the groove; the distance between the two side surfaces of the boss 1 (301) and the boss 2 (903) which are away from each other along the axial direction of the gate shaft (3) is smaller than the length of the groove along the axial direction of the gate shaft (3); when the driving block moves axially along the gate shaft (3), the side wall of the groove can abut against the side wall of the corresponding boss 1 (301) or the boss 2 (903) to drive the locking sleeve (9) and the gate shaft (3); The wedge block (6) is arranged between the inclined surface of the boss 2 (903), the first end surface of the gate shaft (3) and the bottom surface of the groove, and the wedge block (6) is in sliding contact with the inclined surface of the boss 2 (903), the first end surface of the gate shaft (3) and the bottom surface of the groove. The bottom surface of the groove relative to the wedge block (6) is arranged as an inclined surface 1 (401) inclined in the direction of increasing the groove depth from the locking sleeve (9) to the gate shaft (3); when the driving block moves axially along the gate shaft (3), the wedge block (6) can be pushed or released radially along the locking sleeve (9) through the inclined surface 1 (401) to frictionally lock or loosen the locking sleeve (9); The friction surface of the locking seat (14) is opposite to the second end surface of the locking rod (15) and is in contact or spaced therebetween. The locking sleeve (9) in the locked state can push the locking rod (15) when subjected to a reverse force from the gate shaft (3) so that the second end surface of the locking rod (15) abuts against the friction surface of the locking seat (14) to lock the rotation. The locking rod axial pushing piece is arranged on the first end side of the locking rod (15) to limit the locking rod (15) from moving toward the gate shaft (3); or the locking rod axial pushing piece is arranged on the side step of the locking rod (15) close to the side end of the gate shaft (3) to limit the locking rod (15) from moving toward the gate shaft (3); a rotating part or a smooth layer structure is provided between the locking rod axial pushing piece and the opposite side surfaces of the locking rod (15) along the axial direction so that the locking rod (15) can rotate freely around the axial direction relative to the locking rod axial pushing piece.

2. A ram blowout preventer locking device according to claim 1, characterized in that: The driving mechanism further comprises a side door (1), a cylinder sleeve (5), and a cylinder cover (11); The side door (1) and the oil cylinder cover (11) are respectively arranged at the two ends of the oil cylinder sleeve (5) to form a sealed oil cylinder body; The peripheral wall of the gate shaft (3) is sealed with an inner wall of the guide through hole, and the peripheral wall of the drive block is sealed with an inner wall of the cylinder sleeve (5) to form a piston structure, and the interior of the cylinder sleeve (5) is divided into a first chamber (501) and a second chamber (502) by the drive block; The oil cylinder cover (11) is provided with a closed oil passage (1101) passing through the first chamber (501), and the side door (1) is provided with an open oil passage (101) passing through the second chamber (502); The side door (1) is provided with a second guide through hole (102) corresponding to the gate shaft (3) for guiding the movement of the gate shaft (3), and the outer wall of the gate shaft (3) abuts against and seals the inner wall of the second guide through hole (102); The oil cylinder cover (11) is provided with a guide through hole three (1102) corresponding to the locking sleeve (9) for guiding the movement of the locking sleeve (9), and the outer wall of the locking sleeve (9) abuts against the inner wall of the guide through hole three (1102) and is sealed.

3. A ram blowout preventer locking device according to claim 1, characterized in that: The locking sleeve (9) is provided with a clutch disc (8) adapted to the locking sleeve (9) on the outer side corresponding to the second boss (903), and the outer wall of the clutch disc (8) is provided with a clutch disc outer conical surface (802); the wall surface of the wedge block (6) corresponding to the clutch disc outer conical surface (802) is provided with an adapted inclined surface (602); A wear-resistant ring (20) is fixed to the side wall of the gate shaft (3) opposite to the wedge block (6), the wear-resistant ring (20) is sleeved on the second end of the locking sleeve (9), and the inner wall of the wear-resistant ring (20) and the outer wall of the locking sleeve (9) are radially spaced apart; The wedge block (6) is arranged close to the wall surface of the locking sleeve (9) and spaced apart from the outer wall of the locking sleeve (9).

4. A ram blowout preventer locking device according to claim 3, characterized in that: There are a plurality of wedge blocks (6), and the plurality of wedge blocks (6) are distributed at intervals along the circumference of the clutch disc (8).

5. The locking device for a ram blowout preventer according to claim 2, characterized in that: The self-locking mechanism further comprises a locking seat ring (22); the locking rod axial pushing member comprises a push rod (18) and a push rod seat (19); The locking seat (14) is fixed to the side end of the oil cylinder cover (11) away from the side door (1); the end surface of the locking seat (14) close to the side door (1) is provided with a mounting hole (1401) corresponding to the locking rod (15); The locking seat ring (22) is fixedly mounted at the bottom of the mounting hole (1401), and the second end of the locking rod (15) is inserted into the mounting hole (1401) and is close to the locking seat ring (22); the second end of the locking rod (15) is provided with a locking rod outer conical surface (1501), and the locking seat ring (22) is provided with a locking seat ring inner conical surface (2201) that is adapted to and in contact with or spaced from the locking rod outer conical surface (1501); the outer wall surface of the locking seat (14) is provided with an observation hole (1402) that is connected to the mounting hole (1401); The first end surface of the locking rod (15) is provided with a second mounting groove (1502), the push rod seat (19) is movably arranged in the second mounting groove (1502), and the second rotating member is arranged between the push rod seat (19) and the bottom of the second mounting groove (1502); The push rod (18) is fixedly connected to the side of the push rod seat (19) away from the rotating part 2, and the push rod (18) is axially arranged along the locking rod (15); the locking sleeve (9) is provided with a through hole (904) corresponding to the push rod (18), and the gate shaft (3) is provided with an insertion hole (303) corresponding to the push rod (18); the push rod (18) is movably arranged in the through hole (904) along its axial direction, and a seal is provided between the outer wall of the push rod (18) and the inner wall of the through hole (904); the push rod (18) is inserted into the insertion hole (303) at one end away from the push rod seat (19), and has a preset interval with the bottom surface of the insertion hole (303), and a gap is provided between the inner wall of the insertion hole (303) and the outer wall of the corresponding push rod (18).

6. A ram blowout preventer locking device according to claim 5, characterized in that: The driving block comprises an annular piston (2) and an annular gland (4); The annular piston (2) and the annular pressure cover (4) are axially arranged opposite to each other and fixedly connected; the annular piston (2) and the annular pressure cover (4) are both provided with stepped holes along the axial direction on the opposite sides thereof, and the aperture of the stepped hole of the annular piston (2) is larger than the aperture of the stepped hole of the annular pressure cover (4); the internal spaces of the fixedly connected annular piston (2) and the annular pressure cover (4) jointly define the guide through hole 1 and the groove; The boss 1 (301) is located in the stepped hole of the annular piston (2), and the outer wall surface of the boss 1 (301) is slidably arranged with the inner wall surface of the stepped hole of the annular piston (2); the boss 2 (903) is located in the stepped hole of the annular pressure cover (4), and the inner wall surface of the stepped hole of the annular pressure cover (4) is arranged to be the inclined surface 1 (401) corresponding to the boss 2 (903); The inner wall of the annular hole of the annular piston (2) is sealed against the peripheral wall of the gate shaft (3), and the peripheral wall of the annular piston (2) is sealed against the inner wall of the cylinder sleeve (5) to form a piston structure, and the interior of the cylinder sleeve (5) is divided into the first chamber (501) and the second chamber (502) by the annular piston (2); The locking sleeve (9) is inserted into the annular hole of the annular pressure cover (4), and the outer wall of the locking sleeve (9) is clearance-matched with the inner wall of the annular hole.

7. A ram blowout preventer locking device according to claim 6, characterized in that: The first rotating member and the second rotating member are both thrust bearings.

8. A ram blowout preventer locking device according to any one of claims 1 to 7, characterized in that: The first end of the locking rod (15) is threadedly connected to the first end of the locking sleeve (9) using a non-self-locking thread pair structure.

Images