A casing head with blowout interlock protection

Abstract

This invention discloses a bushing head with a blowout preventer interlock protection function, relating to the technical field of bushing head devices. It includes a mounting block, a first lead screw, a movable cover, and two limiting components. One side of the mounting block is fixedly connected to one end of the first lead screw. The end of the first lead screw away from the mounting block extends into the interior of the blowout preventer assembly body, and the end of the first lead screw near the blowout preventer assembly body is threadedly connected to the interior of the bushing head body. A drive plate is rotatably connected inside the mounting block, and a drive groove is provided in the center of the drive plate. In practical use, this invention not only achieves a stable connection between the blowout preventer assembly body and the bushing head body through the mounting block and the first lead screw, but also utilizes the locking structure of the movable cover and the limiting components to form circumferential and axial mechanical constraints on the first lead screw and the mounting block, effectively preventing loosening of the connection due to the shaking or loosening of the first lead screw under vibration. Furthermore, this device does not require frequent maintenance, reducing the labor intensity of on-site operations.

Description

Technical Field

[0001] This invention relates to the field of casing head device technology, specifically a casing head with a blowout prevention interlock protection function. Background Technology

[0002] The casing head is a fundamental component of the wellhead equipment for oil and gas wells. It is installed at the top of the outermost casing string and is used to suspend the casing layers, seal the annular space between the casing strings, and connect to surface equipment such as blowout preventers or Christmas trees. It is a pressure-bearing mechanical component containing slip-type or spindle-type hangers and metal / rubber composite seals. As a hub connecting the downhole and the surface, the casing head achieves effective control of wellhead pressure through interlocking and sealing mechanisms. It is a core interface device for preventing blowouts and ensuring drilling and production safety.

[0003] The casing head is a fundamental component of the wellhead assembly in oil and gas drilling. Installed at the top of the surface casing string, it suspends the casing layers, seals the annular space between the casing strings, and provides a transition connection for equipment such as the blowout preventer (BOP), tubing head, and Christmas tree. The BOP assembly, as the core well control equipment for preventing blowouts, is typically installed on top of the casing head via a flange connection. The upper end of the casing head has a connecting flange, and the bottom of the BOP assembly also has a matching flange. A metal sealing gasket is placed between the two flanges, and the connection is secured by multiple double-ended bolts and nuts evenly distributed along the flange circumference. High-pressure sealing of the flange connection surface is achieved by the bolt preload pressing the sealing gasket. During installation, all bolts must be present, tightened symmetrically, and with consistent thread count at both ends. However, the existing connection structure has significant drawbacks. During drilling operations, the wellhead assembly is subjected to a complex stress environment: the impact of drill string rotation and tripping operations, repeated scraping between the drill string and the BOP and casing, and fluid pulsation caused by drilling fluid circulation all transmit significant periodic vibrations to the wellhead. High-frequency vibrations directly affect the flange bolts connecting the blowout preventer (BOP) assembly and the casing head. Studies have shown that under high-frequency vibrations, bolts and nuts may experience microscopic creep or even loosening. Periodic oscillations are the main cause of bolt loosening and damage to the sealing integrity of the BOP assembly connection. Loose bolts directly lead to a decrease or even loss of preload on the flange connection surface, resulting in serious consequences such as gasket failure and wellhead leakage. Furthermore, existing flange connection structures lack an effective locking and anti-loosening mechanism after bolt tightening, failing to provide continuous anti-loosening protection for the bolt connection. To ensure connection safety, all flange bolts must be checked for looseness and retightened after each pressure test. This not only significantly increases the labor intensity and time cost of on-site operations but also creates safety hazards due to the difficulty in accurately controlling bolt preload. Therefore, those skilled in the art have provided a casing head with BOP interlock protection to solve the problems mentioned in the background. Summary of the Invention

[0004] The purpose of this invention is to provide a bushing head with a blowout prevention interlock protection function to solve the problems mentioned in the background art.

[0005] To achieve the above objectives, the present invention provides the following technical solution: A casing head with a blowout preventer interlock protection function includes a casing head body, a blowout preventer assembly body, and multiple fixing devices. One side of the casing head body is slidably connected to one side of the blowout preventer assembly body, and one side of the multiple fixing devices extends into the interior of the blowout preventer assembly body. The side of the multiple fixing devices near the blowout preventer assembly body is threadedly connected to the interior of the casing head body. The fixing device includes a mounting block, a first lead screw, a movable cover, and two limiting components. One side of the mounting block is fixedly connected to one end of the first lead screw. The end of the first lead screw away from the mounting block extends into the interior of the blowout preventer assembly body, and the end of the first lead screw near the blowout preventer assembly body is threadedly connected to the internal thread of the casing head body. Two through holes are formed inside the mounting block, and two limiting holes are formed on the side of the blowout preventer assembly body near the mounting block. The positions of the two limiting holes correspond to the positions of the two through holes. A drive plate is rotatably connected to the mounting block, and a drive groove is provided in the middle of the drive plate. One end of the movable cover extends into the mounting block on the side away from the first lead screw. The movable cover is rotatably connected to the mounting block, and an adapter block is fixedly connected to the end of the movable cover near the mounting block. The outer side wall of the adapter block fits against the inner side wall of the drive groove. Two limiting components are fixedly connected to the inside of the movable cover, and the outer side wall of the drive plate engages with the two limiting components. The two limiting components extend into the inside of the two through holes and the two limiting holes, respectively.

[0006] As a further embodiment of the present invention: the limiting assembly includes a connecting block, a limiting cylinder, a second lead screw, a passive plate, and a fixing assembly. An installation groove is provided inside the movable cover. The connecting block is fixedly connected to the installation groove. One end of the connecting block away from the movable cover is fixedly connected to one end of the limiting cylinder. One end of the second lead screw is rotatably connected to the side of the connecting block near the limiting cylinder. The passive plate is fixedly connected to the outer wall of the second lead screw. The outer wall of the passive plate engages with the outer wall of the drive plate. One side of the fixing assembly is fixedly connected to the end of the limiting cylinder away from the connecting block. The second lead screw extends into the fixing assembly. Both the limiting cylinder and the fixing assembly extend into the through hole and the limiting hole.

[0007] As a further embodiment of the present invention: the fixing assembly includes a fixing block, a pressure block, and a plurality of top blocks. One side of the fixing block is fixedly connected to the end of the limiting cylinder away from the connecting block. The four sides of the fixing block are provided with through grooves. The plurality of top blocks are slidably connected to the plurality of through grooves respectively. The pressure block is slidably connected to the fixing block. The outer side wall of the pressure block is in contact with the inner side wall of the fixing block, and the opposite sides of the pressure block and the plurality of top blocks are in contact. The end of the second lead screw away from the connecting block is rotatably connected to the fixing block, and the end of the second lead screw near the fixing block is threadedly connected to the pressure block.

[0008] As a further embodiment of the present invention: the plurality of top blocks are all L-shaped, the side of the plurality of top blocks near the pressure block is inclined, and the side of the pressure block near the plurality of top blocks is inclined.

[0009] As a further embodiment of the present invention: a plurality of guide rods are fixedly connected to the side of the sleeve head body near the blowout preventer assembly body, a plurality of guide holes are provided on the blowout preventer assembly body, the plurality of guide rods extend into the plurality of guide holes respectively, and the two limiting holes are respectively located on both sides of the guide holes.

[0010] As a further embodiment of the present invention: the guide rod is provided with a threaded groove, and the first lead screw is threadedly connected to the threaded groove.

[0011] As a further embodiment of the present invention: a sealing groove is provided on the side of the sleeve head body near the blowout preventer assembly body, and a sealing ring is fixedly connected to the side of the blowout preventer assembly body near the sleeve head body. The sealing ring extends into the interior of the sealing groove, and the outer sidewall of the sealing ring fits against the inner sidewall of the sealing groove.

[0012] As a further embodiment of the present invention: the sealing ring is hollow, and the outer wall of the sealing ring is made of elastic material; a vent pipe is fixedly connected to the blowout preventer assembly body; the vent pipe is fixedly connected to the sealing ring; and a valve is connected to the outer end of the vent pipe.

[0013] Compared with the prior art, the beneficial effects of the present invention are: During installation, the blowout preventer assembly body and the casing head body are first aligned, ensuring their connection ends are aligned. Then, the first lead screw is screwed into the pre-set threaded hole in the casing head body. Through the cooperation of the mounting block and the first lead screw, the blowout preventer assembly body and the casing head body are fixedly connected. The two limiting components are located in the two through holes and the two limiting holes, respectively. Next, the movable cover is rotated, causing the adapter block to rotate synchronously. Since the movable cover and the mounting block are rotatably connected, this process is not interfered with by the mounting block. Because the outer wall of the drive plate is engaged with the outer walls of the two limiting components, the rotation of the drive plate causes the internal structures of the two limiting components to rotate synchronously. After rotation, the two limiting components will contact the inner walls of the two limiting holes. Two limiting components can fix the movable cover inside the mounting block, and the two limiting components also fix the movable cover inside the two limiting holes. At this time, the movable cover and the two limiting holes are fixed as one unit. Through the above-mentioned linkage locking mechanism, in actual use, the present invention not only achieves a stable connection between the blowout preventer assembly body and the casing head body through the mounting block and the first lead screw, but also uses the locking structure of the movable cover and the limiting components to form circumferential and axial mechanical constraints on the first lead screw and the mounting block, effectively preventing the connection from loosening due to the shaking or loosening of the first lead screw in a vibration environment. Moreover, the device does not require frequent maintenance, which can reduce the labor intensity of on-site operations. Attached Figure Description

[0014] Figure 1 A split view of a fixing device for a bushing head with a blowout prevention interlock protection function; Figure 2 This is a split view of the casing head body and the blowout preventer assembly body in a casing head with blowout preventer interlock protection function. Figure 3 A sectional view of one side of the fixing device in a casing head with anti-blowout interlock protection function; Figure 4 A structurally exploded view of a fixing device in a casing head with anti-blowout interlock protection function; Figure 5 A sectional view of one side of the mounting block and movable cover in a sleeve head with anti-blowout interlock protection function; Figure 6 This is a sectional view of one side of the limiting cylinder in a casing head with blowout prevention interlock protection function; Figure 7 This is a schematic diagram of the internal structure of a fixing block and a limiting cylinder in a sleeve head with anti-blowout interlock protection function.

[0015] In the diagram: 1. Sleeve head body; 2. Blowout preventer assembly body; 3. Fixing device; 31. Mounting block; 32. First lead screw; 33. Movable cover; 34. Through hole; 35. Limiting hole; 36. Drive plate; 37. Drive groove; 38. Adapter block; 4. Limiting assembly; 41. Connecting block; 42. Limiting cylinder; 43. Second lead screw; 44. Passive plate; 45. Mounting groove; 5. Fixing assembly; 51. Fixing block; 52. Pressure block; 53. Top block; 54. Through groove; 6. Guide rod; 7. Guide hole; 8. Thread groove; 9. Sealing groove; 10. Sealing ring; 11. Vent pipe; 12. Valve. Detailed Implementation

[0016] Please see Figures 1-7 In this embodiment of the invention, a sleeve head with a blowout preventer interlock protection function includes a sleeve head body 1, a blowout preventer assembly body 2, and a plurality of fixing devices 3. One side of the sleeve head body 1 is slidably connected to one side of the blowout preventer assembly body 2, and one side of the plurality of fixing devices 3 extends into the interior of the blowout preventer assembly body 2. The side of the plurality of fixing devices 3 near the blowout preventer assembly body 2 is threadedly connected to the interior of the sleeve head body 1. The fixing device 3 includes a mounting block 31, a first lead screw 32, a movable cover 33, and two limiting components 4. One side of the mounting block 31 is fixedly connected to one end of the first lead screw 32. The end of the first lead screw 32 away from the mounting block 31 extends into the interior of the blowout preventer assembly body 2, and the end of the first lead screw 32 near the blowout preventer assembly body 2 is threadedly connected to the interior of the casing head body 1. The mounting block 31 has two through holes 34 inside, and the blowout preventer assembly body 2 has two limiting holes 35 on the side near the mounting block 31. The positions of the two limiting holes 35 correspond to the positions of the two through holes 34. An internally rotating drive plate 36 is connected, and a drive groove 37 is provided in the middle of the drive plate 36. One end of the movable cover 33 extends into the mounting block 31 on the side away from the first lead screw 32. The movable cover 33 is rotatably connected to the mounting block 31, and an adapter block 38 is fixedly connected to the end of the movable cover 33 near the mounting block 31. The outer side wall of the adapter block 38 fits against the inner side wall of the drive groove 37. Two limiting components 4 are fixedly connected inside the movable cover 33, and the outer side wall of the drive plate 36 engages with the two limiting components 4. The two limiting components 4 extend into the two through holes 34 and the two limiting holes 35, respectively.

[0017] It should be noted that, in the above-mentioned device, such as Figure 3 as well as Figure 4As shown, during use, one side of the blowout preventer assembly body 2 is aligned with one side of the sleeve head body 1. The first lead screw 32 is rotated into the sleeve head body 1. At this time, the blowout preventer assembly body 2 and the sleeve head body 1 can be fixedly connected by the first lead screw 32 and the mounting block 31. Then, the movable cover 33 is rotated, causing the movable cover 33 to drive the adapter block 38 to rotate. Since the movable cover 33 is rotatably connected to the mounting block 31, the mounting block 31 will not obstruct the rotation of the movable cover 33. The movable cover 33 will drive the adapter block 38 to rotate synchronously, and the outer wall of the adapter block 38 is in contact with the inner wall of the drive groove 37. At this time, the drive plate 36 will rotate with the adapter block 38. Since the outer wall of the drive plate 36 is engaged with the outer walls of the two limit components 4, the rotation of the drive plate 36 will drive the internal structure of the two limit components 4 to rotate synchronously. The two limit components 4 pass through the two through holes 34 respectively. The device includes two limiting holes 35. After rotation, the two limiting components 4 will contact the inner walls of the two limiting holes 35. At this time, the two limiting components 4 can fix the movable cover 33 inside the mounting block 31. The two limiting components 4 also fix the movable cover 33 inside the two limiting holes 35. When the device is in use, the blowout preventer assembly body 2 and the sleeve head body 1 are fixedly connected by the mounting block 31 and the first lead screw 32, making the connection of the device more stable. The movable cover 33 and the limiting components 4 can fix the mounting block 31, avoiding the problem of the device loosening in a vibration environment. The movable cover 33 will restrict the mounting block 31, preventing the connection from loosening due to the first lead screw 32 shaking caused by the mounting block 31. Compared with the prior art, this device is not only tightly connected, but also will not loosen in a vibration environment, eliminating the need for frequent re-tightening of the device and reducing the labor intensity of on-site operations.

[0018] The limiting assembly 4 includes a connecting block 41, a limiting cylinder 42, a second lead screw 43, a passive plate 44, and a fixing group 5. The movable cover 33 has an installation groove 45 inside. The connecting block 41 is fixedly connected to the inside of the installation groove 45. The end of the connecting block 41 away from the movable cover 33 is fixedly connected to the end of the limiting cylinder 42. One end of the second lead screw 43 is rotatably connected to the side of the connecting block 41 near the limiting cylinder 42. The passive plate 44 is fixedly connected to the outer wall of the second lead screw 43. The outer wall of the passive plate 44 engages with the outer wall of the drive plate 36. One side of the fixing group 5 is fixedly connected to the end of the limiting cylinder 42 away from the connecting block 41. The second lead screw 43 extends into the inside of the fixing group 5. The limiting cylinder 42 and the fixing group 5 both extend into the through hole 34 and the limiting hole 35.

[0019] It should be noted that, in the above-mentioned device, such as Figure 4 as well as Figure 5As shown, when the drive plate 36 rotates, gears are provided on the outer walls of both the drive plate 36 and the passive plate 44. Since the drive plate 36 meshes with the passive plate 44, the rotation of the drive plate 36 will drive the passive plate 44 to rotate synchronously. The passive plate 44 is fixedly connected to the second lead screw 43, and the passive plate 44 will drive the second lead screw 43 to rotate. In specific use, this device is also as follows... Figure 7 As shown, the outer wall of the limiting cylinder 42 of the device has an opening. This opening can ensure that the passive plate 44 can extend out of the limiting cylinder 42, so that the passive plate 44 can contact the driving plate 36 to achieve the above purpose. When the second lead screw 43 rotates, the second lead screw 43 can cause the internal structure of the fixing group 5 to extend out, so that the outer wall of the fixing group 5 can press the inner wall of the limiting hole 35, so that the movable cover 33 can be fixed inside the mounting block 31 when the device is installed.

[0020] The fixing group 5 includes a fixing block 51, a pressure block 52, and multiple top blocks 53. One side of the fixing block 51 is fixedly connected to the end of the limiting cylinder 42 away from the connecting block 41. The four sides of the fixing block 51 are provided with through grooves 54. The multiple top blocks 53 are slidably connected to the multiple through grooves 54 respectively. The pressure block 52 is slidably connected to the fixing block 51. The outer side wall of the pressure block 52 is in contact with the inner side wall of the fixing block 51, and the opposite sides of the pressure block 52 are in contact with the multiple top blocks 53. The end of the second lead screw 43 away from the connecting block 41 is rotatably connected to the fixing block 51. The end of the second lead screw 43 near the fixing block 51 is threadedly connected to the pressure block 52. The multiple top blocks 53 are all L-shaped. The side of the multiple top blocks 53 near the pressure block 52 is inclined. The side of the pressure block 52 near the multiple top blocks 53 is also inclined.

[0021] It should be noted that, in the above-mentioned device, such as Figure 6 as well as Figure 7 As shown, when the second lead screw 43 rotates, the outer wall of the pressure block 52 is in contact with the inner wall of the fixing block 51. At this time, the pressure block 52 is restricted to sliding only in the vertical direction. The pressure block 52 slides along the outer wall of the second lead screw 43. The opposite sides of the pressure block 52 and the multiple top blocks 53 are inclined, and the pressure block 52 is in contact with the multiple top blocks 53. At this time, the pressure block 52 will squeeze the inclined surface of the multiple top blocks 53, so that the multiple top blocks 53 slide out from the multiple through slots 54. After the multiple top blocks 53 move out, they will squeeze and contact the inner wall of the limiting hole 35, thus achieving the above purpose.

[0022] Multiple guide rods 6 are fixedly connected to the side of the sleeve head body 1 near the blowout preventer assembly body 2. Multiple guide holes 7 are opened on the blowout preventer assembly body 2. The multiple guide rods 6 extend into the multiple guide holes 7 respectively, and two limiting holes 35 are located on both sides of the guide holes 7 respectively. The guide rods 6 are provided with threaded grooves 8. The first lead screw 32 is threadedly connected to the threaded grooves 8. A sealing groove 9 is opened on the side of the sleeve head body 1 near the blowout preventer assembly body 2. A sealing ring 10 is fixedly connected to the side of the blowout preventer assembly body 2 near the sleeve head body 1. The sealing ring 10 extends into the sealing groove 9, and the outer side wall of the sealing ring 10 fits against the inner side wall of the sealing groove 9. The sealing ring 10 is hollow, and the outer side wall of the sealing ring 10 is made of elastic material. A vent pipe 11 is fixedly connected to the blowout preventer assembly body 2. The vent pipe 11 is fixedly connected to the sealing ring 10, and a valve 12 is connected to the outer end of the vent pipe 11.

[0023] It should be noted that, in the above-mentioned device, such as Figure 1 as well as Figure 2 As shown, the positions and quantities of the multiple guide rods 6 and multiple guide holes 7 are all corresponding. During installation, simply align the multiple guide holes 7 with the multiple guide rods 6 to complete the initial installation and fixation. At this time, the threaded groove 8 inside each guide rod 6 can rotate the first lead screw 32 to connect with it, thus completing the fixed installation of the device. Through the set sealing groove 9 and sealing ring 10, the outer wall of the sealing ring 10 fits against the inner wall of the sealing groove 9, so that after the device is fitted and installed, the fitting installation of the sealing ring 10 and the sealing groove 9 can initially guarantee the sealing performance of the device after connection. After the device is installed, the valve 12 is removed, and gas is introduced into the vent pipe 11. Since the outer wall of the sealing ring 10 is made of elastic material and the sealing ring 10 is hollow, the gas entering at this time can cause the sealing ring 10 to expand, so that the outer wall of the sealing ring 10 can contact the inner wall of the sealing groove 9 more tightly. This not only further enhances the sealing performance of the device, but also makes the connection and installation of the sleeve head body 1 and the blowout preventer assembly body 2 more stable.

[0024] The working principle of this invention is: The initial installation and fixing can be completed simply by aligning the multiple guide holes 7 with the multiple guide rods 6. At this time, the threaded groove 8 inside each guide rod 6 can be rotated to connect the first lead screw 32 to it. By introducing gas into the vent pipe 11, since the outer wall of the sealing ring 10 is made of elastic material and the sealing ring 10 is hollow, the gas entering at this time can cause the sealing ring 10 to expand, so that the outer wall of the sealing ring 10 can make a tighter contact with the inner wall of the sealing groove 9. Then, rotate the movable cover 33, so that the movable cover 33 drives the adapter block 38 to rotate. Since the movable cover 33 is rotatably connected to the mounting block 31, the mounting block 31 will not obstruct the rotation of the movable cover 33. The movable cover 33 will drive the adapter block 38 to rotate synchronously, and the outer wall of the adapter block 38 will fit against the inner wall of the drive groove 37. At this time, the drive plate 36 will rotate with the adapter block 38. Since the outer wall of the drive plate 36 is engaged with the outer walls of the two limiting components 4, when the drive plate 36 rotates, it will drive the passive plate 44 to rotate synchronously. The passive plate 44 is fixedly connected to the second lead screw 43. At this time, the passive plate 44 will drive the second lead screw 43 to rotate. The pressure block 52 is restricted to slide only in the vertical direction. At this time, the pressure block 52 slides along the outer wall of the second lead screw 43. The opposite sides of the pressure block 52 and the multiple top blocks 53 are inclined, and the pressure block 52 is in contact with the multiple top blocks 53. At this time, the pressure block 52 will squeeze the inclined surface of the multiple top blocks 53, so that the multiple top blocks 53 slide out from the multiple through slots 54. After the multiple top blocks 53 move out, they will squeeze and contact the inner wall of the limiting hole 35.

[0025] The above description is merely a preferred embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any equivalent substitutions or modifications made by those skilled in the art within the scope of the technology disclosed in the present invention, based on the technical solution and inventive concept of the present invention, should be covered within the scope of protection of the present invention.

Claims

1. A sleeve head with a blowout prevention interlock protection function, characterized in that, It includes a casing head body (1), a blowout preventer assembly body (2) and multiple fixing devices (3). One side of the casing head body (1) is slidably connected to one side of the blowout preventer assembly body (2). One side of the multiple fixing devices (3) extends into the interior of the blowout preventer assembly body (2), and the side of the multiple fixing devices (3) near the blowout preventer assembly body (2) is threadedly connected to the interior of the casing head body (1). The fixing device (3) includes a mounting block (31), a first lead screw (32), a movable cover (33), and two limiting components (4). One side of the mounting block (31) is fixedly connected to one end of the first lead screw (32). The end of the first lead screw (32) away from the mounting block (31) extends into the interior of the blowout preventer assembly body (2), and the end of the first lead screw (32) near the blowout preventer assembly body (2) is threadedly connected to the interior of the sleeve head body (1). Two through holes (34) are opened inside the mounting block (31), and two limiting holes (35) are opened on the side of the blowout preventer assembly body (2) near the mounting block (31). The positions of the two limiting holes (35) correspond to the positions of the two through holes (34). The mounting block (31) contains... A drive plate (36) is rotatably connected to the drive plate (36), and a drive groove (37) is provided in the middle of the drive plate (36). One end of the movable cover (33) extends into the side of the mounting block (31) away from the first lead screw (32). The movable cover (33) is rotatably connected to the mounting block (31), and an adapter block (38) is fixedly connected to one end of the movable cover (33) near the mounting block (31). The outer side wall of the adapter block (38) fits against the inner side wall of the drive groove (37). Two limiting components (4) are fixedly connected to the inside of the movable cover (33), and the outer side wall of the drive plate (36) meshes with the two limiting components (4). The two limiting components (4) extend into the inside of the two through holes (34) and the two limiting holes (35).

2. A sleeve head with anti-blowout interlock protection function according to claim 1, characterized in that, The limiting assembly (4) includes a connecting block (41), a limiting cylinder (42), a second lead screw (43), a passive plate (44), and a fixing assembly (5). The movable cover (33) has an internal mounting groove (45). The connecting block (41) is fixedly connected to the inside of the mounting groove (45). One end of the connecting block (41) away from the movable cover (33) is fixedly connected to one end of the limiting cylinder (42). One end of the second lead screw (43) is connected to the connecting block (41) near the limiting cylinder (42). The passive plate (44) is fixedly connected to the outer wall of the second lead screw (43), and the outer wall of the passive plate (44) meshes with the outer wall of the drive plate (36). One side of the fixing group (5) is fixedly connected to the end of the limiting cylinder (42) away from the connecting block (41). The second lead screw (43) extends into the interior of the fixing group (5). The limiting cylinder (42) and the fixing group (5) both extend into the interior of the through hole (34) and the limiting hole (35).

3. A sleeve head with anti-blowout interlock protection function according to claim 2, characterized in that, The fixing assembly (5) includes a fixing block (51), a pressure block (52), and multiple top blocks (53). One side of the fixing block (51) is fixedly connected to the end of the limiting cylinder (42) away from the connecting block (41). The four sides of the fixing block (51) are provided with through grooves (54). Multiple top blocks (53) are slidably connected to multiple through grooves (54). The pressure block (52) is slidably connected to the fixing block (51). The outer wall of the pressure block (52) is in contact with the inner wall of the fixing block (51), and the opposite sides of the pressure block (52) are in contact with the multiple top blocks (53). The end of the second screw (43) away from the connecting block (41) is rotatably connected to the fixing block (51), and the end of the second screw (43) close to the fixing block (51) is threadedly connected to the pressure block (52).

4. A sleeve head with anti-blowout interlock protection function according to claim 3, characterized in that, The multiple top blocks (53) are all L-shaped, and the side of the multiple top blocks (53) near the pressure block (52) is inclined. The side of the pressure block (52) near the multiple top blocks (53) is also inclined.

5. A sleeve head with anti-blowout interlock protection function according to claim 4, characterized in that, The sleeve head body (1) is fixedly connected to a plurality of guide rods (6) on the side near the blowout preventer assembly body (2). The blowout preventer assembly body (2) is provided with a plurality of guide holes (7). The plurality of guide rods (6) extend into the plurality of guide holes (7) respectively, and the two limiting holes (35) are located on both sides of the guide holes (7).

6. A sleeve head with anti-blowout interlock protection function according to claim 5, characterized in that, The guide rod (6) has a threaded groove (8), and the first lead screw (32) is threadedly connected to the threaded groove (8).

7. A sleeve head with anti-blowout interlock protection function according to claim 6, characterized in that, The sleeve head body (1) has a sealing groove (9) on the side near the blowout preventer assembly body (2). A sealing ring (10) is fixedly connected to the side of the blowout preventer assembly body (2) near the sleeve head body (1). The sealing ring (10) extends into the sealing groove (9), and the outer wall of the sealing ring (10) fits against the inner wall of the sealing groove (9).

8. A sleeve head with anti-blowout interlock protection function according to claim 7, characterized in that, The sealing ring (10) is hollow, and the outer wall of the sealing ring (10) is made of elastic material. A vent pipe (11) is fixedly connected to the blowout preventer assembly body (2). The vent pipe (11) is fixedly connected to the sealing ring (10), and a valve (12) is connected to the outer end of the vent pipe (11).

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