Blowout preventer ram assembly changing device
By designing a blowout preventer gate assembly replacement device, which adopts a double-joint rotation and self-locking structure, the problems of low replacement efficiency and high safety hazards in the existing technology have been solved, realizing convenient and efficient gate assembly replacement at the wellhead.
Patent Information
- Application Number
- CN202610277582.0
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2026-03-09
- Publication Date
- 2026-08-25
AI Technical Summary
The existing methods for replacing blowout preventer gate assemblies suffer from problems such as limited space, significant safety hazards, poor connection compatibility, and insufficient structural strength, resulting in low replacement efficiency and safety risks.
A blowout preventer gate assembly replacement device was designed, including a fixed base, main boom, boom and hoisting components. It adopts a double-joint rotating structure and a two-way self-locking structure. It uses high-strength steel and bearings to achieve a stable connection and position adjustment of the device. It is equipped with hoisting components to achieve precise hoisting and self-locking protection.
It enables convenient operation in the confined space of the wellhead, improves replacement efficiency, reduces labor costs, ensures operational safety and connection accuracy, and avoids component wear and loosening.
Smart Images
Figure CN122627329A_ABST
Abstract
Description
Technical Field
[0001] This invention relates to the field of oil drilling equipment maintenance technology, specifically to a blowout preventer gate assembly replacement device. Background Technology
[0002] Blowout preventers (BOPs) are core safety devices installed at the wellhead during oil drilling and well workover processes to prevent blowout accidents. The gate assembly inside the BOP needs to be disassembled and replaced regularly according to drilling process requirements and equipment maintenance specifications. The existing replacement method for gate assembly lacks dedicated tooling support and mainly relies on manual operation with universal adapters, which has several technical drawbacks: First, the universal adapter cannot be directly fixed to the blowout preventer body, requiring additional working space around the wellhead. However, the wellhead area is densely populated with equipment, and limited space makes it difficult to move the adapter. Second, there is no self-locking protective structure during the lifting process, which can easily cause the gate assembly to shake and slip, posing a serious safety hazard. Moreover, it requires multiple people to operate, which is time-consuming, labor-intensive, and has extremely low replacement efficiency. Third, the connection method between the adapter and the gate assembly is poorly compatible, resulting in high lifting friction resistance, which can easily cause component wear. At the same time, the position adjustment accuracy is low, making it difficult to quickly align with the gate lifting hole. Fourth, the traditional replacement tooling has insufficient structural strength. It is made of ordinary steel and cannot withstand the weight of the gate assembly. It is prone to deformation after long-term use, and the bolts at the connection points lack anti-loosening structures, which can easily lead to problems such as nuts coming loose and connections becoming loose.
[0003] To address the shortcomings of the existing technologies, there is an urgent need to develop a replacement device specifically for the blowout preventer (BOP) gate assembly. This device would integrate the device with the BOP, ensuring flexibility in position adjustment, safety during lifting, and structural stability. It would also meet the operational requirements of confined wellhead spaces and enable convenient single-person operation. Summary of the Invention
[0004] The purpose of this invention is to overcome the above-mentioned problems and provide a blowout preventer gate assembly replacement device. To achieve the above objective, this invention adopts the following technical solution: The blowout preventer gate assembly replacement device includes: A fixed base is used to secure the entire device to the blowout preventer cylinder; The main arm, one end of which is rotatably connected to the fixed base; The boom is rotatably connected to the other end of the main boom; A lifting assembly, mounted on the boom, is used to connect to and lift the gate assembly; A locking mechanism is used to lock the relative rotation between the main boom and the fixed base, as well as between the main boom and the boom.
[0005] As an improvement, the hoisting assembly includes: The winch, located on one end of the boom, has a two-way self-locking structure; A steel wire rope is wound around the winch; The lifting ring assembly, attached to the end of the wire rope, is used to connect to the lifting hole of the gate assembly.
[0006] As an improvement, the lifting ring assembly includes a conversion joint and rollers. One end of the boom is provided with a mounting groove, and the two rollers are symmetrically rotated and arranged at both ends of the mounting groove. The conversion joint is located below the rollers, and the wire rope is wound around the rollers and connected to the top of the conversion joint.
[0007] As an improvement, the adapter includes a fixed head and a lifting bolt. The fixed head is rotatably mounted on top of the lifting bolt. The wire rope is connected to the fixed head, and the lifting bolt is connected to the lifting hole of the gate assembly.
[0008] As an improvement, a first master pin is provided between one end of the fixed base and one end of the main boom, and a second master pin is provided between the other end of the main boom and the middle of the boom. The locking mechanism includes a first locking nut and a second locking nut, with the first locking nut located on the top of the first master pin and the second locking nut located on the top of the second master pin.
[0009] As an improvement, one end of the fixed base is provided with a fixing hole, which is fixed to the bottom of the first main pin. One end of the main arm is provided with a first fixing groove, and a first bearing is provided between the first fixing groove and the first main pin. The first locking nut abuts against the top surface of one end of the main arm.
[0010] As an improvement, a limiting groove is provided in the middle of the boom, and a limiting block is provided at the bottom of the second main pin. The limiting groove and the limiting block are fixed together. A second fixing groove is provided at the bottom of the other end of the main boom. A second bearing and a third bearing are provided between the second fixing groove and the first main pin. The second bearing is located above the third bearing. The diameter of the second bearing is smaller than that of the third bearing. The second locking nut abuts against the top surface of the middle of the boom.
[0011] As an improvement, the fixing base includes two clamping seats, a locking double-ended bolt is provided between the two clamping seats, the fixing hole is provided on one of the clamping seats, and the bottom of the two clamping seats is provided with symmetrically arranged clamping grooves, which clamp and fix to the blowout preventer cylinder.
[0012] As an improvement, the main boom and / or jib are made of 40Cr14 steel plate, the thickness of the main boom is not less than 40mm, and the thickness of the jib is not less than 25mm.
[0013] As an improvement, all bolts used on the replacement device are fitted with cotter pins.
[0014] The advantages of this invention are: 1. This invention saves working space and is suitable for wellhead scenarios: The device can be directly fixed on the blowout preventer cylinder without additional support equipment, effectively saving working space around the wellhead and perfectly adapting to working environments with dense wellhead equipment and limited space.
[0015] 2. The invention features a double-joint rotation structure, allowing for precise and flexible position adjustment: the main boom and the boom form a double-joint rotation structure, enabling multi-directional and multi-angle adjustments of the lifting components. This allows for quick alignment with the lifting holes of the gate assembly, significantly improving connection efficiency and reducing the difficulty of manual alignment.
[0016] 3. This invention can be operated by a single person, improving replacement efficiency: The hoisting component adopts a two-way self-locking winch, which can achieve self-locking at any position during the hoisting and lowering process. No multiple people are required to cooperate and support. Only one person is needed to complete the hoisting, relocation and disassembly of the entire gate assembly, which greatly improves the replacement efficiency of the gate assembly and reduces labor costs.
[0017] 4. This invention features multiple anti-detachment protections, ensuring high operational safety: all fasteners are fitted with cotter pins to prevent loosening or detachment; the winch employs a two-way self-locking structure to prevent the gate assembly from slipping during lifting; all connecting parts are engaged with bearings and main pins, ensuring smooth rotation and precise positioning, thus structurally eliminating potential safety hazards during operation and improving operational safety. Attached Figure Description
[0018] Figure 1 The overall structure of the blowout preventer gate assembly replacement device in Example 1. Figure 1 .
[0019] Figure 2 The overall structure of the blowout preventer gate assembly replacement device in Example 1. Figure 2 .
[0020] Figure 3 This is an exploded view of the blowout preventer gate assembly replacement device in Example 1.
[0021] Figure 4 This is a structural diagram of the main arm in Example 1.
[0022] Figure 5 This is a structural diagram of the boom in Example 1.
[0023] Figure 6 This is an integrated structure diagram of the first main pin in Example 1.
[0024] Figure 7 This is an exploded view of the first master pin in Example 1.
[0025] Figure 8 This is an integrated structure diagram of the second main pin in Example 1.
[0026] Figure 9 This is an exploded view of the second main pin in Example 1.
[0027] Figure 10 This is an exploded view of the adapter in Example 1.
[0028] Figure 11 This is an exploded view of the fixed base in Example 1.
[0029] The diagram is labeled as follows: 1. Fixed base; 11. Clamping seat; 12. Locking double-ended bolt; 13. Fixing hole; 14. Clamping groove; 2. Main boom; 21. First fixing slot; 22. Second fixing slot; 3. Crane boom; 31. Limiting groove; 32. Mounting groove; 4. Lifting components; 41. Winch; 42. Rollers; 43. Adapter; 431. Fixing head; 432. Lifting bolts; 5. Locking mechanism; 51. First locking nut; 52. Second locking nut; 53. First kingpin; 54. Second kingpin; 55. Limiting block; 56. First bearing; 57. Second bearing; 58. Third bearing. Detailed Implementation
[0030] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. The components of the embodiments of the present invention described and shown in the accompanying drawings can generally be arranged and designed in various different configurations.
[0031] In the description of the embodiments of this invention, it should be noted that if terms such as "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," or "outer" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, or the orientation or positional relationship commonly used when the product is in use, they are only for the convenience of describing the invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of the invention. Furthermore, terms such as "first," "second," and "third" are only used to distinguish descriptions and should not be construed as indicating or implying relative importance.
[0032] Furthermore, the use of terms such as "horizontal," "vertical," and "sag" does not imply that the component must be absolutely horizontal or suspended, but rather that it can be slightly tilted. For example, "horizontal" simply means that its direction is more horizontal relative to "vertical," and does not mean that the structure must be completely horizontal, but can be slightly tilted.
[0033] In the description of the embodiments of the present invention, "multiple" means at least two.
[0034] In the description of the embodiments of the present invention, it should also be noted that, unless otherwise explicitly specified and limited, the terms "set," "install," "connect," and "link" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in the present invention according to the specific circumstances.
[0035] The present invention will now be described in detail and specifically through specific embodiments to enable a better understanding of the invention. However, the following embodiments do not limit the scope of protection of the present invention. Example
[0036] This embodiment discloses a blowout preventer gate assembly replacement device.
[0037] like Figures 1 to 11 As shown, this embodiment includes a modular architecture centered on a fixed base 1, main boom 2, boom 3, lifting assembly 4, and locking mechanism 5. The structure, connection relationship, function, and collaborative working logic of each component of the blowout preventer gate assembly replacement device strictly correspond to all claims, as explained in detail below: like Figure 1 , Figure 2 , Figure 3 As shown, the fixed base 1 of the overall structural frame of this device is used to detachably fix the entire device to the blowout preventer cylinder, providing a stable installation reference for the device; one end of the main boom 2 is rotatably connected to the fixed base 1, and the other end is rotatably connected to the middle of the boom 3, forming a double-joint rotating structure to realize multi-directional position adjustment of the lifting component 4; the lifting component 4 is set at one end of the boom 3, and is used to accurately connect with the lifting hole of the gate assembly and realize the lifting action; the locking mechanism 5 is respectively set at the rotating connection between the main boom 2 and the fixed base 1, and between the main boom 2 and the boom 3, and is used to lock the relative rotation between the components to ensure the structural stability of the device during the lifting process.
[0038] like Figure 11 As shown, the fixed base 1 is the core component for the installation and fixation of the device. It connects the device to the blowout preventer cylinder, enabling quick assembly and disassembly as well as stable fixation of the device. Main structure: Includes two symmetrically arranged clamping seats 11, with a locking double-ended bolt 12 passing between the two clamping seats 11. The distance between the two clamping seats 11 can be adjusted by tightening the locking double-ended bolt 12 to achieve clamping and loosening of the blowout preventer cylinder. The bottom of each clamping seat 11 is provided with symmetrical arc-shaped clamping grooves 14. The clamping grooves 14 are adapted to the outer wall contour of the blowout preventer cylinder to ensure that the clamping seat 11 can fit tightly against the cylinder and improve the fixation stability.
[0039] Rotary connection structure: A fixing hole 13 is provided on the top of one of the clamping seats 11. The fixing hole 13 is fixedly connected to the bottom of the first main pin 53, providing axial positioning for the first main pin 53 and realizing the rotational connection support between the main arm 2 and the fixed base 1.
[0040] like Figure 4 , Figure 5 As shown, the main boom 2 and the boom 3 are double-jointed rotating booms that allow for flexible position adjustment. Both the main boom 2 and the boom 3 are load-bearing and rotating components of the device, made of high-strength alloy steel to ensure load-bearing capacity. At the same time, the double-jointed rotation allows for multi-directional adjustment of the lifting assembly 4. Material and Specifications: Both the main boom 2 and the boom 3 are made of 40Cr14 steel plate. The thickness of the main boom 2 is not less than 40mm and the thickness of the boom 3 is not less than 25mm. This material and specification design ensures that the boom has sufficient structural strength and resistance to deformation, can bear the weight of the gate assembly, and meet the load-bearing requirements of lifting operations.
[0041] like Figure 6 , 7 As shown, the connection structure of the main boom 2 is as follows: A first fixing groove 21 is opened at the bottom of one end of the main boom 2, and a first bearing 56 is installed in the first fixing groove 21. The first bearing 56 is sleeved on the outside of the first main pin 53. The main boom 2 rotates 360° relative to the fixed base 1 through the rotational engagement of the first bearing 56 and the first main pin 53; A second fixing groove 22 is opened at the bottom of the other end of the main boom 2, and a second bearing 57 and a third bearing 58 are installed in the second fixing groove 22 from top to bottom. The diameter of the second bearing 57 is smaller than that of the third bearing 58. Both are sleeved on the outside of the second main pin 54 to provide smooth engagement support for the rotation of the boom 3 and the main boom 2.
[0042] like Figure 8 , 9As shown, the connection structure of the boom 3 is as follows: a limiting groove 31 is provided in the middle of the boom 3, and a limiting block 55 is fixedly provided at the bottom of the second main pin 54. The limiting groove 31 and the limiting block 55 cooperate to realize the circumferential positioning of the second main pin 54 and the boom 3, and prevent circumferential slippage during rotation. The boom 3 rotates with the second main pin 54 through the second bearing 57 and the third bearing 58, so as to realize the flexible rotation of the boom 3 relative to the main boom 2. It forms a double joint rotation structure with the main boom 2, which greatly improves the position adjustment range of the lifting assembly 4.
[0043] Locking Mechanism 5: Locks relative rotation to ensure lifting stability. Locking mechanism 5 is located at two rotating connections to lock the relative rotation between the main boom 2 and the fixed base 1, and between the main boom 2 and the boom 3, preventing the boom from shifting during lifting. Main structure: Includes a first locking nut 51 and a second locking nut 52. The first locking nut 51 is threaded to the top of the first main pin 53. After tightening, it abuts against the top surface of one end of the main arm 2, locking the relative rotation between the main arm 2 and the fixed base 1 through axial clamping force. The second locking nut 52 is threaded to the top of the second main pin 54. After tightening, it abuts against the top surface of the middle part of the boom 3, locking the relative rotation between the main arm 2 and the boom 3 through axial clamping force.
[0044] Unlocking and locking: Loosening the locking nut releases the restriction on the boom's rotation, allowing for position adjustment; after adjustment, tightening the locking nut secures the boom. The operation is convenient and suits the needs of rapid wellhead operations.
[0045] Lifting component 4: Enables precise lifting and self-locking protection of the gate assembly. Lifting component 4 is located at one end of the boom 3 and is the lifting actuator for the gate assembly. It features bidirectional self-locking, low friction, and precise connection, corresponding to claims 2, 3, and 4. Core components include a winch 41, a wire rope, and a lifting ring assembly. The winch 41 is fixedly installed at the end of the boom 3 away from the main boom 2 and adopts a two-way self-locking structure design, which can achieve self-locking at any position during the lifting process to prevent the gate assembly from slipping and improve operational safety. The wire rope is wound on the drum of the winch 41, and its end is connected to the lifting ring assembly. By rotating the winch 41, the wire rope can be wound up and unwound, thereby driving the lifting ring assembly to rise and fall.
[0046] like Figure 10As shown, the lifting ring assembly structure includes a conversion joint 43, rollers 42, and a mounting groove 32 at one end of the boom 3. Two rollers 42 are symmetrically rotated and arranged inside the two ends of the mounting groove 32. The wire rope passes around the two rollers 42 and connects to the top of the conversion joint 43, converting the sliding friction between the wire rope and the conversion joint 43 into the rolling friction of the rollers 42, greatly reducing frictional resistance, reducing component wear, and extending the service life of the device. The conversion joint 43 includes a fixing head 431 and a lifting bolt 432. The fixing head 431 is rotatably arranged on the top of the lifting bolt 432 and is fixedly connected to the bottom of the conversion joint 43. The external thread of the lifting bolt 432 is adapted to the internal thread of the lifting hole of the gate assembly, achieving a precise and firm connection with the gate assembly. The rotation design of the fixing head 431 can adapt to the fine adjustment of the angle of the gate assembly during the lifting process, avoiding wire rope entanglement.
[0047] Anti-detachment and protective structure: In accordance with claim 10, the reliability and safety of the lifting device are ensured by the fact that all bolts, nuts and other fasteners used on this device are equipped with cotter pins at their ends. The cotter pins can effectively prevent the fasteners from coming off or loosening due to vibration, operation impact and other factors, ensuring the stability of each connection part of the device and avoiding safety accidents caused by loose fasteners during operation.
[0048] III. Core Working Principle This device achieves safe and efficient replacement of the blowout preventer gate assembly through a coordinated working logic of base fixing, boom positioning, precise connection, self-locking lifting, and relocation / disassembly. The specific principle is as follows: The two clamping seats 11 of the fixed base 1 are attached to the preset positions of the blowout preventer cylinder through the clamping grooves 14. The locking double-headed bolts 12 are tightened to fix the entire device firmly on the cylinder, thus completing the installation of the device. Loosen the first locking nut 51 and the second locking nut 52 to release the rotation lock on the main boom 2 and the boom 3. Rotate the main boom 2 and the boom 3 respectively, and adjust the position of the lifting ring assembly so that the lifting bolt 432 is aligned with the lifting hole of the gate assembly. Rotate the winch 41 to lower the wire rope, and tighten the lifting bolt 432 into the lifting hole of the gate assembly to achieve a firm connection between the lifting component 4 and the gate assembly. Tighten the first locking nut 51 and the second locking nut 52 in sequence to lock the positions of the main boom 2 and the boom 3. Then rotate the winch 41 again to lift the gate assembly upward by winding the wire rope until the gate assembly is completely separated from the blowout preventer body. The two-way self-locking structure of the winch 41 can keep the gate assembly at any lifting height to prevent it from slipping. Loosen the two locking nuts again, slowly rotate the main boom 2 and the boom 3, move the hoisted gate assembly to the preset placement position next to the wellhead, rotate the winch 41 to lower the gate assembly, unscrew the hoisting bolt 432, and complete the disassembly of the gate assembly. For the new gate assembly, simply reverse the steps described above to achieve precise installation of the new gate assembly. After the gate assembly is replaced, loosen the locking double-ended bolt 12 and remove the entire device from the blowout preventer cylinder to complete the operation. Example
[0049] Materials and specifications: The main boom 2 is made of 40Cr14 steel plate with a thickness of 40mm and a length of 1200mm; the boom 3 is made of 40Cr14 steel plate with a thickness of 25mm and a length of 800mm; the first bearing 56 is made of two NCF209V bearings, the second bearing 57 is made of NCF208V bearings, and the third bearing 58 is made of XRU5515 bearings.
[0050] Lifting component 4: Winch 41 is a two-way self-locking wire rope winch 41.
[0051] Maintenance and Precautions Before operation, check the stability of each connection part of the device, confirm that the cotter pin is installed in place, the bearing rotates smoothly, and the self-locking function of the winch 41 is normal, in order to avoid malfunctions during operation. When lifting the gate assembly, no one is allowed to stand below the lifting area or near where the gate assembly may fall, to prevent the gate assembly from slipping and causing a safety accident. After the operation is completed, lubrication and maintenance should be performed on easily worn parts such as wire ropes, rollers 42, and bearings, and severely worn wire ropes should be replaced to ensure the reliability of the equipment in the next operation. When replacing the lower chamber gate of the double-gate blowout preventer, it is necessary to ensure that the upper chamber side door is closed. After the gate is removed, all components except the fixed base 1 can be removed to avoid interference between the side door and the main pin.
[0052] The specific embodiments of the present invention have been described in detail above, but they are merely examples, and the present invention is not equivalent to the specific embodiments described above. For those skilled in the art, any equivalent modifications and substitutions to the present invention are also within the scope of the present invention. Therefore, all equivalent transformations and modifications made without departing from the spirit and scope of the present invention should be covered within the scope of the present invention.
Claims
1. A blowout preventer gate assembly replacement device, characterized in that, include: Fixed base (1), used to fix the entire device to the blowout preventer cylinder; The main arm (2) is rotatably connected at one end to the fixed base (1); The boom (3) is rotatably connected to the other end of the main boom (2); The hoisting assembly (4) is mounted on the boom (3) and is used to connect to and hoist the gate assembly; The locking mechanism (5) is used to lock the relative rotation between the main boom (2) and the fixed base (1) and between the main boom (2) and the boom (3).
2. The blowout preventer gate assembly replacement device according to claim 1, characterized in that, The hoisting assembly (4) includes: The winch (41) is located on one end of the boom (3) and has a two-way self-locking structure; The steel wire rope is wound around the winch (41); The lifting ring assembly, attached to the end of the wire rope, is used to connect to the lifting hole of the gate assembly.
3. The blowout preventer gate assembly replacement device according to claim 2, characterized in that, The lifting ring assembly includes a conversion joint (43) and rollers (42). One end of the boom (3) is provided with a mounting groove (32). The two rollers (42) are symmetrically rotated and arranged at both ends of the mounting groove (32). The conversion joint (43) is located below the rollers (42). The wire rope is wound around the rollers (42) and connected to the top of the conversion joint (43).
4. The blowout preventer gate assembly replacement device according to claim 3, characterized in that, The adapter (43) includes a fixed head (431) and a lifting bolt (432). The fixed head (431) is rotatably mounted on the top of the lifting bolt (432). The wire rope is connected to the fixed head (431), and the lifting bolt (432) is connected to the lifting hole of the gate assembly.
5. The blowout preventer gate assembly replacement device according to claim 1, characterized in that, A first master pin (53) is provided between one end of the fixed base (1) and one end of the main arm (2), and a second master pin (54) is provided between the other end of the main arm (2) and the middle part of the boom (3). The locking mechanism (5) includes a first locking nut (51) and a second locking nut (52). The first locking nut (51) is located on the top of the first master pin (53), and the second locking nut (52) is located on the top of the second master pin (54).
6. The blowout preventer gate assembly replacement device according to claim 5, characterized in that, The fixed base (1) has a fixing hole (13) at one end, the fixing hole (13) is fixed to the bottom of the first main pin (53), the bottom of one end of the main arm (2) has a first fixing groove (21), a first bearing (56) is provided between the first fixing groove (21) and the first main pin (53), and the first locking nut (51) abuts against the top surface of one end of the main arm (2).
7. The blowout preventer gate assembly replacement device according to claim 6, characterized in that, The boom (3) is provided with a limiting groove (31) in the middle, and the bottom of the second main pin (54) is provided with a limiting block (55). The limiting groove (31) and the limiting block (55) are fixed together. The bottom of the other end of the main boom (2) is provided with a second fixing groove (22). A second bearing (57) and a third bearing (58) are provided between the second fixing groove (22) and the first main pin (53). The second bearing (57) is located above the third bearing (58). The diameter of the second bearing (57) is smaller than that of the third bearing (58). The second locking nut (52) abuts against the top surface of the middle part of the boom (3).
8. The blowout preventer gate assembly replacement device according to claim 6, characterized in that, The fixed base (1) includes two clamping seats (11), and a locking double-headed bolt (12) is provided between the two clamping seats (11). The fixing hole (13) is provided on one of the clamping seats (11), and the bottom of the two clamping seats (11) is provided with symmetrically arranged clamping grooves (14). The clamping grooves (14) are clamped and fixed on the blowout preventer cylinder.
9. The blowout preventer gate assembly replacement device according to claim 1, characterized in that, The main boom (2) and / or the boom (3) are made of 40Cr14 steel plate, the thickness of the main boom (2) is not less than 40mm, and the thickness of the boom (3) is not less than 25mm.
10. The blowout preventer gate assembly replacement device according to claim 1, characterized in that, All bolts used on the replacement device are fitted with cotter pins.