CN210068055U - Hydraulic locking device of blowout preventer - Google Patents
Hydraulic locking device of blowout preventer Download PDFInfo
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- CN210068055U CN210068055U CN201821720987.4U CN201821720987U CN210068055U CN 210068055 U CN210068055 U CN 210068055U CN 201821720987 U CN201821720987 U CN 201821720987U CN 210068055 U CN210068055 U CN 210068055U
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Abstract
A hydraulic locking device of a blowout preventer belongs to drilling control key equipment in the field of ocean engineering and comprises a locking device cylinder body, a locking sliding block and a hydraulic spring braking device. The locking device cylinder body is positioned at the end part of the hydraulic cylinder of the blowout preventer and connected with the hydraulic cylinder; the locking slide block is arranged in the locking device cylinder body, and two ends of the locking slide block are pushed by hydraulic pressure to lock the position of the locking rod of the blowout preventer; the hydraulic spring brake device cylinder body is located outside the locking device cylinder body, and the brake piston and the brake shaft penetrating into the locking device cylinder body drive the brake pad to tightly hold the locking slide block so as to lock the locking slide block, prevent the locking slide block from moving backwards and further ensure the locking of the locking rod of the blowout preventer. The utility model discloses, the device structure is more compact, and the design of fail safe this application device is more safe and reliable to, the device simple structure that this application provided, easily installation.
Description
Technical Field
The utility model relates to an ocean drilling engineering field especially relates to locking device to flashboard preventer.
Background
Ram preventers are the most important well control devices for drilling and completion processes in oil production. The ram blowout preventer has the main characteristics that: the gate plate has strong sealing capability, high reliability and high pressure resistance, and can keep a closed state for a long time to seal a well mouth; second, the blowout preventer can be equipped with the flashboard which closes various specification types of drilling rod, casing pipe and oil pipe, also can be equipped with the totally enclosed flashboard which closes the empty well, and is equipped with the shearing flashboard which shears the drilling rod under the emergency condition.
After the ram blowout preventer is closed, the locking rod of the blowout preventer needs to be held in a fixed position for a relatively long period of time, but under wellhead pressure, the locking rod of the blowout preventer may not be fully locked due to movement of the locking slide. The sealing effect of the blowout preventer can be influenced when the locking rod of the blowout preventer is not locked, and even oil and gas in the well are leaked out, and the well sealing is failed. Therefore, the locking of the locking rod of the blowout preventer must be ensured, so that the well sealing work of the blowout preventer can be safer and more effective.
In the locking device of the existing ram blowout preventer, the locking slide block can still move backwards in a locking state, so that the locking rod cannot be locked completely. There is therefore a need to provide a new locking structure that avoids the above problems.
SUMMERY OF THE UTILITY MODEL
In order to solve the defects existing in the prior art, the utility model aims to provide a hydraulic locking device of a blowout preventer.
First, in order to achieve the above object, a hydraulic locking device of a blowout preventer is provided, including: a casing within which a blowout preventer lock lever is received; the blowout preventer locking lever moving up and down within the casing along the casing between an unlocked position and a locked position to lock or unlock the blowout preventer; further comprising: the locking device cylinder body is intersected with the sleeve; the locking sliding block is arranged in the locking device cylinder body and slides left and right between a first position and a second position along the inner cavity of the locking device cylinder body; the bottom end of the locking slide block is provided with a locking inclined plane, the right end of the locking inclined plane is also provided with a locking slide block through hole, and the locking slide block through hole vertically penetrates through the locking slide block; the inner diameter of the locking slide block through hole is not smaller than the diameter of the locking rod of the blowout preventer, and when the locking slide block is located at the first position on the left side of the inner cavity of the locking device cylinder body, the locking slide block through hole receives the locking rod of the blowout preventer to penetrate through and moves up and down between the locking position and the releasing position; when the locking slide block is located at the second position on the right side of the inner cavity of the locking device cylinder body, the top end of the blowout preventer locking rod is abutted against the locking inclined surface of the locking slide block, so that the blowout preventer locking rod is fixed at the locking position; and the hydraulic spring braking device is connected with the locking device cylinder body, and when the locking slide block is positioned at the second position, the hydraulic spring braking device extrudes and holds the locking slide block tightly to fix the locking slide block.
Optionally, in the hydraulic locking device of the blowout preventer, at least one end of the locking cylinder is further provided with a hydraulic joint, and the hydraulic joint is configured to input high-pressure oil into the locking cylinder to push the locking slider to slide in the locking cylinder between a first position on the left side inside the locking cylinder and a second position on the right side inside the locking cylinder.
Optionally, in the hydraulic locking device of the blowout preventer, a recessed area is further formed in an end portion, close to the hydraulic joint, of the locking slider, and the recessed area is annular and forms a cavity for containing the high-pressure oil.
Optionally, in the above hydraulic locking device of the blowout preventer, the hydraulic spring brake device comprises at least 1 pair oppositely arranged along the axis of the locking device cylinder.
Optionally, in the above hydraulic locking device for a blowout preventer, the hydraulic spring brake device includes: the braking outer sleeve is connected with the outer wall of the locking device cylinder body; in the braking outer sleeve, still be equipped with in proper order by being close to the one end of locking device cylinder body is to keeping away from the one end of locking device cylinder body: the brake pad is arranged at one end, connected with the locking device cylinder body, in the brake outer sleeve and used for squeezing and tightly holding the locking slide block when the locking slide block is located at the second position; one end of the brake shaft is connected with the brake pad, and the other end of the brake shaft is connected with the brake piston; one side of the brake piston and the inner wall of the brake outer sleeve form a brake cavity for sealing the brake shaft and the brake pad; the outer wall of the brake cavity is also provided with a hydraulic connector for injecting high-pressure oil into the brake cavity; and the brake spring is arranged between the other side of the brake piston and the closed end of the brake outer sleeve and used for pushing the brake piston and the brake shaft to extrude and hold the brake pad tightly to the locking slide block.
Optionally, in the hydraulic locking device of the blowout preventer, a radian is arranged on one surface of the brake pad, which is in contact with the locking slide block, and the radian is attached to a radian of a side surface of the locking slide block.
Optionally, in the hydraulic locking device of the blowout preventer, the top of the locking rod of the blowout preventer is a top end inclined surface, the top end inclined surface has an inclination angle identical to that of the locking inclined surface at the bottom end of the locking slider, and the locking inclined surface is inclined downward from the right end of the locking inclined surface to the left.
Optionally, in the above apparatus, the braking cavity includes at least 1 pair of pairs symmetrically arranged along the axial direction of the cylinder of the locking device, and the braking pad is arranged in each braking cavity; and in the second step or the third step, when the locking slide block is positioned at the second position, high-pressure oil in the plurality of brake cavities is injected or led out through the hydraulic connector.
Optionally, in the above apparatus, when the brake cavity or the hydraulic connector fails, the brake spring pushes the brake piston and the brake shaft, so that the brake pad is squeezed to tightly hold the locking slider, and the locking slider is fixed to the first position; when the locking slide block is in the first position, the locking rod of the blowout preventer is abutted in a locking position.
Advantageous effects
The utility model discloses, including the locking device cylinder body, locking slider and hydraulic spring arresting gear. The locking device cylinder body is positioned at the end part of the hydraulic cylinder of the blowout preventer and connected with the hydraulic cylinder; the locking slide block is arranged in the locking device cylinder body, and two ends of the locking slide block are pushed by hydraulic pressure to lock the position of the locking rod of the blowout preventer; the hydraulic spring brake device cylinder body is located outside the locking device cylinder body, and the brake piston and the brake shaft penetrating into the locking device cylinder body drive the brake pad to tightly hold the locking slide block so as to lock the locking slide block, prevent the locking slide block from moving backwards and further ensure the locking of the locking rod of the blowout preventer.
This application adopts the friction braking principle for the first time, locks the slider position with spring counter-force, prevents its back migration, and then reaches the effect of locking preventer check lock lever. Therefore, the device has the advantages that the volume is reduced, the working principle of the brake spring is simple and reliable, and the locking device is an improvement on the locking device of the existing blowout preventer locking rod.
Further, the design of failure safety is adopted in the application, and after locking, the hydraulic connector 250 can be directly opened to lead out the high-pressure oil in the brake cavity 260 even if hydraulic failure occurs. Therefore, the brake spring 220 will automatically push the brake piston 230 and the brake shaft 240, so that the brake pad 270 is squeezed to tightly hold the locking slider 120, thereby ensuring that the locking slider 120 is always in a locked state and ensuring the safety of drilling operation.
Additional features and advantages of the invention will be set forth in the description which follows, and in part will be obvious from the description, or may be learned by the practice of the invention.
Drawings
The accompanying drawings are included to provide a further understanding of the invention, and are incorporated in and constitute a part of this specification, together with the embodiments of the invention for the purpose of explanation and not limitation of the invention. In the drawings:
fig. 1 is a schematic diagram of the relative positions of the locking rod of the blowout preventer, the locking device cylinder and the locking slide block before the blowout preventer closes the wellhead;
fig. 2 is a schematic diagram of the relative positions of the locking rod of the blowout preventer, the locking device cylinder and the locking slide block after the blowout preventer closes the wellhead;
fig. 3 is a schematic view of the hydraulic spring brake at section AA in the previous figures.
Detailed Description
The preferred embodiments of the present invention will be described in conjunction with the accompanying drawings, and it will be understood that they are presented herein only to illustrate and explain the present invention, and not to limit the present invention.
The upper, lower, left and right sides described in the present application are convenient for the skilled person to understand, and only show the relative connection position relationship between the structures obtained from the drawings, and are not used to limit the technical solution of the present application.
Fig. 1 is according to the utility model discloses a preventer hydraulic pressure locking device, include: a casing 180, said casing 180 having a blowout preventer lock lever 140 received therein; the blowout preventer lock bar 140 moves up and down within the casing along the casing between an unlocked position and a locked position to lock or unlock the blowout preventer. Referring specifically to FIG. 1 or FIG. 2, the release position refers to the blowout preventer lock lever 140 being in an upper portion of the casing shown in FIG. 1; the locked position means that the blowout preventer lock lever 140 is in the lower portion of the casing as shown in figure 2. The application also includes: a locking device cylinder 110 disposed to intersect the sleeve 180; a locking slider 120 disposed inside the locking cylinder 110 and sliding left and right along the inner cavity of the locking cylinder 110 between a first position shown in fig. 1 and a second position shown in fig. 2; the bottom end of the locking slide block is provided with a locking inclined plane, the right end of the locking inclined plane is also provided with a locking slide block through hole, and the locking slide block through hole vertically penetrates through the locking slide block; the inside diameter of the locking slide through-hole is no less than the diameter of the locking rod 140 of the blowout preventer, and when the locking slide is in a first position on the left side of the inner cavity of the locking device cylinder 110, as shown in fig. 1, the locking slide through-hole receives the locking rod of the blowout preventer and moves up and down between the locking position and the release position; when the locking slide is in the second position on the right side of the inner cavity of the locking device cylinder 110, as shown in fig. 2, the top end of the locking rod 140 of the blowout preventer abuts against the locking inclined surface of the locking slide, so that the locking rod 140 of the blowout preventer is fixed at the locking position; and the hydraulic spring braking device 200 is connected with the locking device cylinder body 110, and when the locking slide block is located at the second position, the hydraulic spring braking device extrudes and clasps the locking slide block to fix the locking slide block.
Optionally, in the above hydraulic locking device for a blowout preventer, at least one end of the locking cylinder 110 is further provided with a hydraulic joint 190, and the hydraulic joint is configured to input high pressure oil into the locking cylinder 110 to push the locking slider to slide in the locking cylinder 110 between a first position on the left side inside the locking cylinder 110 and a second position on the right side inside the locking cylinder 110. Referring to fig. 2, the hydraulic joint 192 may be further synchronously provided at the other end of the locking cylinder 110, and the hydraulic joint 193 is used to input high pressure oil into the locking cylinder 110, and the high pressure oil is received in an oil chamber 193 formed by the locking slider and the locking device cylinder 110 to push the locking slider 120 to move.
Optionally, in the above hydraulic locking device for a blowout preventer, a recessed area 191 is further disposed at an end of the locking slider close to the hydraulic joint 190, and the recessed area 191 is annular to form a cavity for containing the high-pressure oil, so that the filled high-pressure oil uniformly pushes an end surface of the locking slider.
Optionally, in the above hydraulic locking device of the blowout preventer, the hydraulic spring brake device 200 includes at least 1 pair oppositely disposed along the axis of the locking device cylinder 110.
Optionally, referring to fig. 3, in the hydraulic locking device of the blowout preventer, the hydraulic spring brake device 200 includes: a brake outer sleeve 210 connected to an outer wall of the locking device cylinder 110; in the braking outer sleeve 210, from the end close to the locking device cylinder 110 to the end far away from the locking device cylinder 110, there are further provided in sequence: a brake pad 270 disposed at one end of the brake outer sleeve 210 connected to the locking device cylinder 110, for squeezing and clasping the locking slider when the locking slider is located at the second position; a brake shaft 240 having one end connected to the brake pad 270 and the other end connected to the brake piston 230; a brake piston 230 having one side thereof forming a brake chamber 260 with an inner wall of the brake outer sleeve 210 to enclose the brake shaft 240 and the brake pad 270; the outer wall of the brake cavity 260 is further provided with a hydraulic connector 250 for injecting high-pressure oil into the brake cavity 260; and a brake spring 220 disposed between the other side of the brake piston 230 and the closed end of the brake outer sleeve 210 for pushing the brake piston 230 and the brake shaft 240 to press the brake pad 270 tightly against the locking slider 120.
Optionally, in the above hydraulic locking device for a blowout preventer, a radian is provided on a surface of the brake pad 270 contacting the locking slider, and the radian is attached to a radian of a side surface of the locking slider.
Optionally, in the above hydraulic locking device of the blowout preventer, the top of the locking rod 140 of the blowout preventer is a top end inclined surface, the top end inclined surface has an inclination angle the same as that of the locking inclined surface at the bottom end of the locking slider, and the locking inclined surface is inclined downward from the right end of the locking inclined surface to the left.
In addition, the size and the shape of the locking slide block in the device, the application number and the installation position of the hydraulic spring brake device, or the shape and the material of the brake valve plate can be further optimized according to engineering requirements.
The above-mentioned device is connected with the end of the ram preventer cylinder 170 through the connecting structure 160, and the sleeve 180 is sealed with the ram preventer cylinder 170 of the ram preventer through the connecting structure 150 to accommodate the ram preventer locking rod 140 to move up and down.
Secondly, in order to achieve the above object, there is also provided a hydraulic locking method of a blowout preventer, wherein the step of fixing the locking rod 140 of the blowout preventer comprises: firstly, injecting high-pressure oil into a brake cavity 260 through a hydraulic connector 250 to push a brake piston 230 to drive a brake shaft 240 connected with the brake piston and a brake pad 270 connected with the brake shaft to retreat, and loosening the fixation of a locking slide block 120; secondly, injecting high-pressure oil into the locking cylinder 110 through a hydraulic joint 190 to push the locking slider to slide from a first position to a second position in the locking cylinder 110 along the axial direction of the locking cylinder 110; at this time, the top end of the blowout preventer locking rod 140 abuts against the locking inclined surface at the bottom end of the locking slide block and is fixed; thirdly, high-pressure oil in the brake cavity 260 is led out through a hydraulic connector 250, and a brake spring 220 pushes the brake piston 230 and the brake shaft 240, so that the brake pad 270 is pressed to tightly hold the locking slider 120, and the locking slider is fixed to a second position on the right side of the inner cavity of the locking device cylinder 110; when the lock slide is in the second position, the blowout preventer lock lever 140 is abutted in a locked position.
Thus, in one implementation of the present application, the position of the blowout preventer lock rod is within the casing 180 before the blowout preventer closes the wellhead, as shown in FIG. 1. After the blowout preventer closes the wellhead, the position of the locking slide is changed from the position shown in fig. 1 to the position shown in fig. 2 for the purpose of locking the locking rod 140 of the blowout preventer. The specific operation process is as follows:
1. high-pressure oil is injected into the area of the 260 in the cavity of the brake outer sleeve 210 through the hydraulic connector 250 to push the brake piston 230 and further compress the brake spring 220, so that the brake pad 270 retreats;
2. at the same time, high-pressure oil is injected into the area 191 in the cavity of the locking device cylinder 110 through the hydraulic joint 190, the locking slider is pushed to move from the position shown in fig. 1 to the position shown in fig. 2, the bottom inclined surface of the locking slider 120 is contacted with the top of the locking rod 140 of the blowout preventer, and the position of the locking rod 140 of the blowout preventer is fixed;
3. then, high-pressure oil in the area of 260 in the cavity of the brake outer sleeve 210 is relieved through the hydraulic connector 250, the brake spring 220 pushes the brake piston 230, the brake shaft 240 presses the brake pad 270 to tightly hold the lock slide 120, and the lock slide 120 is locked in the position shown in fig. 2 through friction force, so that the blowout preventer lock rod 140 is further ensured to be locked in the position shown in fig. 2
Optionally, in the above method, the braking cavities 260 include at least 1 pair symmetrically arranged along the axial direction of the locking device cylinder 110, and each braking cavity is provided with the braking pad 270; in the second step or the third step, high-pressure oil in the plurality of brake chambers is injected or led out through the hydraulic connector 250.
Optionally, in the above method, when the brake chamber 260 or the hydraulic connector 250 fails, the brake spring 220 pushes the brake piston 230 and the brake shaft 240, so that the brake pad 270 is pressed to hug the locking slider 120, and the locking slider is fixed to the first position; when the lock slide is in the first position, the blowout preventer lock lever 140 is abutted in a locked position.
The utility model discloses technical scheme's advantage mainly embodies: the utility model provides a hydraulic locking device for locking preventer check lock lever position for well drilling, including a locking device cylinder body, a locking slider, and many to hydraulic spring arresting gear. The spring hydraulic brake device consists of a brake outer sleeve, a brake spring, a brake piston, a brake shaft and a brake pad. The locking sliding block in the cylinder body of the hydraulic locking device can be pushed back and forth by injecting hydraulic oil into two ends of the cylinder body so as to lock the position of the locking rod of the blowout preventer; the hydraulic spring brake device cylinder body is located outside the locking device cylinder body, the brake piston and the brake shaft penetrating into the locking device cylinder body drive the brake pad to tightly hold the locking slide block, the locking of the locking slide block is completed by adopting the principle of friction force, the backward movement of the locking slide block is prevented, and the locking of the locking rod of the blowout preventer is further ensured. The utility model discloses the situation of the unable complete locking of check lock lever because locking slide's retrodisplacement leads to has been avoidd effectively. Moreover, compared with the traditional hydraulic locking device, the device provided by the application has the advantages of smaller volume, simpler and more reliable working principle, simple structure and easy installation. In particular, the design of failure safety is adopted in the application, and after locking, the locking state can be ensured even if hydraulic failure occurs, so that the safety of drilling operation is ensured.
Those of ordinary skill in the art will understand that: although the present invention has been described in detail with reference to the foregoing embodiments, it will be apparent to those skilled in the art that modifications may be made to the embodiments described in the foregoing embodiments, or equivalents may be substituted for elements thereof. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (9)
1. A blowout preventer hydraulic locking apparatus, comprising:
a casing (180), the casing (180) having a blowout preventer lock lever (140) housed therein;
the blowout preventer lock lever (140) moving up and down within the casing along the casing between an unlocked position and a locked position to lock or unlock the blowout preventer;
it is characterized by also comprising:
a locking device cylinder (110) arranged to intersect the sleeve (180);
the locking sliding block (120) is arranged in the locking device cylinder body (110) and slides left and right between a first position and a second position along the inner cavity of the locking device cylinder body (110); the bottom end of the locking slide block is provided with a locking inclined plane, the right end of the locking inclined plane is also provided with a locking slide block through hole, and the locking slide block through hole vertically penetrates through the locking slide block; the inner diameter of the locking slide through hole is not less than the diameter of the locking rod (140) of the blowout preventer, and when the locking slide is at a first position on the left side of the inner cavity of the locking device cylinder body (110), the locking slide through hole receives the locking rod of the blowout preventer to penetrate through and moves up and down between the locking position and the releasing position; when the locking slide block is located at a second position on the right side of the inner cavity of the locking device cylinder body (110), the top end of the blowout preventer locking rod (140) is abutted against the locking inclined surface of the locking slide block, so that the blowout preventer locking rod (140) is fixed at the locking position;
and the hydraulic spring braking device (200) is connected with the locking device cylinder body (110), and when the locking sliding block is located at the second position, the hydraulic spring braking device extrudes and holds the locking sliding block tightly to fix the locking sliding block.
2. The hydraulic locking device of the blowout preventer according to claim 1, characterized in that at least one end of the locking device cylinder (110) is further provided with a hydraulic connection (190) for feeding high pressure oil into the locking device cylinder (110) to push the locking slider to slide inside the locking device cylinder (110) between a first position on the left inside the locking device cylinder (110) and a second position on the right inside the locking device cylinder (110).
3. The hydraulic locking device of a blowout preventer according to claim 2, characterized in that the end of the locking slide close to the hydraulic joint (190) is further provided with a recessed area (191), the recessed area (191) being annular and constituting a cavity for receiving the high-pressure oil.
4. The hydraulic locking device of the blowout preventer according to claim 1, characterized in that the hydraulic spring brake device (200) comprises at least 1 pair oppositely arranged along the axis of the locking device cylinder (110).
5. Blowout preventer hydraulic locking device according to claim 4, characterized in that the hydraulic spring brake device (200) comprises:
a brake outer sleeve (210) connected to an outer wall of the locking device cylinder (110);
in the braking outer sleeve (210), from one end close to the locking device cylinder body (110) to one end far away from the locking device cylinder body (110), the braking outer sleeve is further provided with:
the brake pad (270) is arranged at one end, connected with the locking device cylinder body (110), in the brake outer sleeve (210) and used for squeezing and clasping the locking slide block when the locking slide block is located at the second position;
a brake shaft (240) having one end connected to the brake pad (270) and the other end connected to a brake piston (230);
a brake piston (230) having one side forming a brake chamber (260) with an inner wall of the brake outer sleeve (210) to enclose the brake shaft (240), the brake pad (270);
the outer wall of the brake cavity (260) is also provided with a hydraulic connector (250) for injecting high-pressure oil into the brake cavity (260);
and the brake spring (220) is arranged between the other side of the brake piston (230) and the closed end of the brake outer sleeve (210) and used for pushing the brake piston (230) and the brake shaft (240) to press the brake pad (270) to tightly hold the locking slider (120).
6. The hydraulic locking device of a blowout preventer according to claim 5, characterized in that the side of the brake pads (270) that is in contact with the locking slide is provided with a curvature that conforms to the curvature of the side of the locking slide.
7. Hydraulic locking device of a blowout preventer according to any one of claims 1 to 6, characterised in that the top of the locking rod (140) of the blowout preventer is a top-end bevel having the same angle of inclination as the locking bevel at the bottom end of the locking slide,
the locking inclined plane inclines downwards from the right end of the locking inclined plane to the left.
8. The hydraulic locking device of a blowout preventer according to claim 5,
the brake cavity (260) comprises at least 1 pair of brake pads (270) which are symmetrically arranged along the axial direction of the locking device cylinder body (110);
when the locking slide block is located at the second position, high-pressure oil in the plurality of brake cavities is injected or led out through the hydraulic connector (250) at the same time.
9. The hydraulic locking device of the blowout preventer according to claim 5, characterized in that, in case of failure of the brake chamber (260) or the hydraulic connector (250), the brake spring (220) pushes the brake piston (230), the brake shaft (240) and the brake pad (270) to squeeze and hold the locking slide (120) tightly, fixing the locking slide to the first position; when the locking slide is in the first position, the blowout preventer locking stem (140) is abutted in a locked position.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201821720987.4U CN210068055U (en) | 2018-10-23 | 2018-10-23 | Hydraulic locking device of blowout preventer |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201821720987.4U CN210068055U (en) | 2018-10-23 | 2018-10-23 | Hydraulic locking device of blowout preventer |
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| CN210068055U true CN210068055U (en) | 2020-02-14 |
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| CN201821720987.4U Active CN210068055U (en) | 2018-10-23 | 2018-10-23 | Hydraulic locking device of blowout preventer |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109083612A (en) * | 2018-10-23 | 2018-12-25 | 招商局重工（江苏）有限公司 | A kind of blowout preventer hydraulic locking device and locking method |
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2018
- 2018-10-23 CN CN201821720987.4U patent/CN210068055U/en active Active
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109083612A (en) * | 2018-10-23 | 2018-12-25 | 招商局重工（江苏）有限公司 | A kind of blowout preventer hydraulic locking device and locking method |
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