An erosion resistant spool head

Abstract

The application provides a kind of scouring resistant casing head, relating to the technical field of casing head, including casing head body, flange is detachably installed on casing head body, hanger is installed in the top of casing head body, casing one and casing two are installed on hanger in upper and lower parts, positioning member is provided on casing head body, positioning member is used for positioning hanger, casing head body includes casing box, positioning buffer device is arranged in casing box, positioning buffer device is used for positioning hanger, positioning buffer device is used for buffering casing two.The application sets double positioning structure of positioning member and positioning buffer device, improves the installation stability of hanger and casing, so that hanger always maintains stable posture, avoids the misplacement of sealing surface or structural deformation caused by impact;through positioning buffer device, casing head and casing can be effectively buffered, prolong its service life.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of casing head, in particular to a scour-resistant casing head. BACKGROUND

[0002] The scour-resistant casing head is a core wellhead equipment in oil and gas drilling and completion operation, mainly used for connecting the wellhead casing string, supporting the weight of the casing, and providing a mounting base for subsequent wellhead devices (such as blowout preventers and Christmas trees), and its core feature is the ability to resist high-speed fluid (including sand and corrosive media) erosion and wear, ensuring the sealing and structural integrity of the wellhead in long-term production or special operations (such as fracturing and acidizing).

[0003] In the whole life cycle of oil exploitation, the casing head, as the core load-bearing and sealing component of the wellhead system, is always in a complex and harsh working environment, and its long-term operation state directly determines the safety of the wellhead and the continuity of the production operation. The continuous impact of the working medium is one of the key factors leading to the performance degradation and shortening of the service life of the casing head; in order to cope with the impact damage, frequent maintenance is required, such as replacing the sealing element, repairing the scouring part, and even directly replacing the casing head. SUMMARY

[0004] The present application provides a scour-resistant casing head to solve the problems raised in the background.

[0005] To solve the above technical problems, the present application discloses a scour-resistant casing head, which comprises a casing head body, a flange detachably installed on the casing head body, a hanger installed on the top of the casing head body, a casing I and a casing II installed on the hanger in an upper and lower arrangement, a positioning element penetrating the casing head body, the positioning element being used for positioning the hanger, the casing head body comprising a casing box, a positioning and buffering device being arranged in the casing box, the positioning and buffering device being used for positioning the hanger and buffering the casing II.

[0006] Preferably, the casing I is threadedly connected to the upper end of the hanger, and the casing II is threadedly connected to the lower end of the hanger; the positioning element is provided in two, symmetrically penetrating the casing head body, and the positioning element is threadedly connected to the casing head body; the hanger is provided with positioning holes I symmetrically on the left and right sides, and the positioning element cooperates with the positioning holes I.

[0007] Preferably, the positioning and buffering device is provided in two, symmetrically arranged in the casing box, and the positioning and buffering device comprises a buffering element, the buffering element being fixedly arranged on the inner wall of the lower side of the casing box, a buffering plate being fixedly arranged on the upper end of the buffering element, the buffering plate being slidably connected to the inner wall of the casing box, a three-link rod assembly being arranged on the buffering plate, and a positioning assembly being installed on the upper end of the three-link rod assembly, the positioning assembly being used for positioning the hanger.

[0008] Preferably, the three-link assembly comprises a fixed block fixedly arranged at one end of the buffer plate away from the inner wall of the sleeve box, a first connecting plate hingedly arranged on the fixed block, a second connecting plate hingedly arranged on the first connecting plate, a third connecting plate hingedly arranged on the second connecting plate, and a positioning assembly hingedly arranged on the third connecting plate.

[0009] Preferably, a sliding groove is arranged on the buffer plate, a sliding plate is slidingly arranged in the sliding groove, a rotating block is hingedly arranged at the upper end of the sliding plate, a protruding plate is arranged on the lower surface of the first connecting plate, and the rotating block slidingly cooperates with the protruding plate.

[0010] Preferably, a concave groove is further arranged on the buffer plate, a toothed plate is arranged in the concave groove, an installation block is fixedly arranged at one end of the sliding plate, a threaded rod is penetratingly arranged on the installation block, the threaded rod is threadedly connected with the installation block, a rotating wheel is fixedly arranged at the upper end of the threaded rod, a limiting block is rotationally connected with the lower end of the threaded rod, the limiting block is arranged in the concave groove, and the limiting block cooperates with the toothed plate.

[0011] Preferably, the positioning assembly comprises a U-shaped plate, a threaded shaft is rotationally penetratingly arranged on the U-shaped plate, a hand wheel is fixedly arranged at one end of the threaded shaft, a limiting block is threadedly connected with the threaded shaft, the limiting block slidingly connects with the U-shaped plate, a second positioning hole is symmetrically arranged on the hanger, the second positioning hole cooperates with the limiting block, and a threaded hole is further arranged on one side wall of the U-shaped plate.

[0012] A linear driving element is further fixedly arranged on the fixed block, and the upper end of the linear driving element cooperates with the lower surface of the U-shaped plate.

[0013] Preferably, the positioning and buffering device further comprises a suction disc, the suction disc cooperates with the sleeve two, the suction disc is penetratingly connected with an air pipe at the lower end, the other end of the air pipe is penetratingly connected with a box body, and the box body is fixedly arranged on the lower surface of the sleeve box.

[0014] Preferably, a flexible sliding plate is slidingly arranged at one end of the suction disc away from the sleeve two, the flexible sliding plate is fixedly connected with the fixed block, a connecting column is fixedly arranged at the lower end of the flexible sliding plate, an inclined plate is fixedly arranged at the lower end of the connecting column, an inclined block is cooperatively arranged at the lower side of the inclined plate, and the inclined block slidingly connects with the lower surface of the sleeve box.

[0015] Preferably, a buffering air pushing plate is slidingly arranged in the box body, a buffering air pushing rod is fixedly arranged at one end of the inclined block, the buffering air pushing rod slidingly extends into the box body, and a spring is fixedly connected with the buffering air pushing plate.

[0016] Compared with the prior art, the present application provides a kind of scouring resistance sleeve head, with the following beneficial effects: the present application is provided with the double positioning structure of positioning part and positioning buffer device, which greatly improves the installation stability of hanger and sleeve, so that the hanger always maintains stable posture, avoids the misplacement of sealing surface or structural deformation caused by impact, and delays the performance decay rate;Through the positioning buffer device, the sleeve head and the sleeve can be effectively buffered, which greatly weakens the impact damage of working medium to the key components of sleeve head, thereby prolonging its service life. BRIEF DESCRIPTION OF DRAWINGS

[0017] The accompanying drawings are included to provide a further understanding of the application, and constitute a part of the specification, and are used to explain the application together with embodiments of the application, and do not constitute a limitation on the application. In the drawings:

[0018] Figure 1 is a structural schematic diagram of the present application;

[0019] Figure 2 is a structural schematic diagram of the positioning buffer device of the present application;

[0020] Figure 3 is a structural schematic diagram of the positioning assembly of the present application;

[0021] Figure 4 is a top view of the suction cup of the present application;

[0022] Figure 5 is a structural schematic diagram of the box of the present application;

[0023] Figure 6 is an appearance schematic diagram of the buffer plate of the present application.

[0024] In the drawings: 1, flange;2, sleeve one;3, hanger;4, positioning part;5, sleeve head body;6, sleeve two;7, support seat;8, sleeve box;9, buffer part;10, buffer plate;11, first connecting plate;12, second connecting plate;13, U-shaped plate;14, positioning hole two;15, third connecting plate;16, straight line driving part;17, fixed block;18, suction cup;19, flexible sliding plate;20, air pipe;21, inclined plate;22, inclined block;23, buffer air pushing rod;24, box;25, connecting column;26, hand wheel;27, threaded shaft;28, threaded hole;29, positioning block;30, spring;31, buffer air pushing plate;32, sliding plate;33, rotating block;34, convex plate;35, rotating wheel;36, mounting block;37, threaded rod;38, limit block;39, concave groove;40, toothed plate;41, sliding groove. DETAILED DESCRIPTION

[0025] With reference to the accompanying drawings, the technical solutions in the embodiments of the present application will be clearly and completely described below. Obviously, the described embodiments are only a part of the embodiments of the present application, rather than all the embodiments of the present application. Based on the embodiments in the present application, all other embodiments obtained by those of ordinary skill in the art without creative efforts belong to the scope of the present application.

[0026] In the description of the present application, it should be noted that the terms "upper", "lower", "inner", "outer", "front end", "rear end", "two ends", "one end", "the other end" and the like indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the present application and simplifying the description, and do not indicate or imply that the devices or elements referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as limiting the present application. In addition, the terms "first" and "second" are only for descriptive purposes and cannot be understood as indicating or implying relative importance.

[0027] In the description of the present application, it should be noted that unless otherwise explicitly specified and limited, the terms "mounting", "provided with", "connection" and the like should be broadly understood, for example, "connection" can be fixed connection, can also be detachable connection, or integral connection; can be mechanical connection, can also be electrical connection; can be directly connected, can also be indirectly connected through an intermediate medium, can be the communication inside two elements. For those of ordinary skill in the art, the specific meaning of the above terms in the present application can be understood according to the specific circumstances.

[0028] Embodiment 1:

[0029] The embodiments of the present application provide a kind of scouring bushing head, as shown in Figures 1-6 The bushing head body 5 is detachably mounted with flange 1, the top of bushing head body 5 is mounted with hanger 3, hanger 3 is installed with casing one 2 and casing two 6 from top to bottom, positioning piece 4 is arranged on bushing head body 5, positioning piece 4 is used to position hanger 3, bushing head body 5 includes casing box 8, positioning buffer device is arranged in casing box 8, positioning buffer device is used to position hanger 3, and positioning buffer device is used to buffer casing two 6.

[0030] The top and bottom of the hanger 3 are provided with sealing pads, which can be referred to the existing patent CN118346214A, and the present application will not be described in detail.

[0031] The bottom side of the casing box 8 is provided with a support seat 7.

[0032] The working principle and beneficial effects of the above technical solution are that: firstly, the casing one 2 is connected to the upper end of the hanger 3, and the casing two 6 is connected to the lower end of the hanger 3, forming a casing-hanger overall assembly; then the assembly is installed into the top of the casing head body 5, and the positioning hole one of the hanger 3 is matched with the positioning member 4 symmetrically arranged in the casing head body 5, so as to preliminarily fix the position of the hanger 3 from the horizontal direction; then the positioning and buffering device in the casing box 8 of the casing head body 5 is started, and the hanger 3 is positioned again, and the casing two 6 is buffered.

[0033] By arranging the double positioning structure of the positioning member 4 and the positioning and buffering device, the installation stability of the hanger 3 and the casing is greatly improved, so that the hanger 3 always maintains a stable posture, avoids the misalignment of the sealing surface or the structural deformation caused by impact, and delays the performance decay rate; through the positioning and buffering device, the casing head body 5 and the casing can be effectively buffered, so that the impact damage of the working medium to the key components of the casing head is greatly weakened, thereby prolonging the service life.

[0034] Embodiment 2:

[0035] On the basis of the above-mentioned embodiment 1, as shown in the figure, the hanger 3 is threadedly connected with the casing one 2 at the upper end, and the hanger 3 is threadedly connected with the casing two 6 at the lower end; the positioning member 4 is arranged symmetrically on the casing head body 5, and the positioning member 4 is threadedly connected with the casing head body 5; the hanger 3 is symmetrically provided with the positioning hole one at the upper end and the lower end, and the positioning member 4 is matched with the positioning hole one. Figure 1 The working principle and beneficial effects of the above technical solution are that: the hanger 3 is threadedly connected with the casing one 2 at the upper end, and the hanger 3 is threadedly connected with the casing two 6 at the lower end, so as to realize the vertical butt joint of the casing string; the thread connection can preliminarily guarantee the sealing between the casing and the hanger, form a rigid whole, avoid the relative sliding between the casing one 2 and the casing two 6 and the hanger 3 under the impact of the medium, and reduce the wear of the connection part; by rotating the two positioning members 4, the hanger 3 is fixed in both directions from the horizontal direction, the horizontal positioning of the hanger 3 prevents it from being deflected due to the impact of high-speed fluid, ensures that the sealing surface is always aligned, and reduces the risk of leakage; the positioning member 4 is threadedly connected with the casing head body 5, which is simple to operate and convenient for installation and debugging.

[0036] Embodiment 3:

[0037] On the basis of the above-mentioned embodiments 1-2, as shown in the figure, the hanger 3 is threadedly connected with the casing one 2 at the upper end, and the hanger 3 is threadedly connected with the casing two 6 at the lower end; the positioning member 4 is arranged symmetrically on the casing head body 5, and the positioning member 4 is threadedly connected with the casing head body 5; the hanger 3 is symmetrically provided with the positioning hole one at the upper end and the lower end, and the positioning member 4 is matched with the positioning hole one.

[0038] Figures 1-2 ​As shown, the positioning buffer device is provided with two, and the positioning buffer device is symmetrically arranged in the casing box 8, and the positioning buffer device comprises a buffer piece 9, the buffer piece 9 is fixedly arranged on the lower inner wall of the casing box 8, the upper end of the buffer piece 9 is fixedly provided with a buffer plate 10, the buffer plate 10 is slidably connected with the inner wall of the casing box 8, the buffer plate 10 is provided with a three-link assembly, and the upper end of the three-link assembly is provided with a positioning assembly, and the positioning assembly is used for positioning the hanger 3.

[0039] Preferably, the three-link assembly comprises a fixed block 17, the fixed block 17 is fixedly arranged at one end of the buffer plate 10 away from the inner wall of the casing box 8, the first connecting plate 11 is hingedly connected to the fixed block 17, the second connecting plate 12 is hingedly connected to the first connecting plate 11, the third connecting plate 15 is hingedly connected to the second connecting plate 12, and the positioning assembly is hingedly connected to the third connecting plate 15.

[0040] Preferably, the fixed block 17 is further fixedly provided with a linear drive 16, and the upper end of the linear drive 16 is matched with the lower surface of the positioning assembly.

[0041] The working principle and beneficial effects of the above technical scheme are as follows: first, the angles of the first connecting plate 11, the second connecting plate 12 and the third connecting plate 15 are adjusted in sequence, so that the upper surface of the positioning assembly is in contact with the upper surface of the casing box 8, and the positioning assembly is in abutment with the hanger 3, thereby preliminarily realizing positioning and alignment; then the linear drive 16 is started, the output end of the linear drive 16 will press the upper surface of the positioning assembly and the upper surface of the casing box 8, at this time, the positioning assembly is started, so that the positioning assembly is connected with the hanger 3, thereby achieving the limiting effect, greatly improving the positioning stability of the hanger 3, and reducing the risk of sealing surface misplacement;

[0042] At this time, the positioning assembly, the linear drive 16, the fixed block 17 and the three-link assembly form an integral whole, when vibration is encountered, the vibration and impact load transmitted by the hanger 3 can be uniformly conducted to the buffer plate 10, the buffer piece 9 at the lower end of the buffer plate 10 can absorb the impact energy in the vertical direction, and at the same time, the three-link assembly can convert part of the vertical impact into horizontal dispersion force through the slight rotation of the hinge points, thereby avoiding local stress concentration, more efficiently reducing the damage of the working medium (such as sand-containing fracturing fluid) impact to the casing head body 5 and the casing two 6, delaying component fatigue, prolonging the service life, in addition, the angle of the three-link assembly can be flexibly adjusted, which can adapt to the positioning needs of hangers 3 of different specifications; the pressure output of the linear drive 16 can be dynamically adjusted according to the working conditions, so as to ensure the pressing force during positioning.

[0043] Embodiment 4:

[0044] On the basis of the above-mentioned embodiment 3, as Figure 1 , Figure 6As shown, the buffer plate 10 is provided with a sliding groove 41, and a sliding plate 32 is slidably arranged in the sliding groove 41, and a rotating block 33 is hingedly connected to the upper end of the sliding plate 32, and the lower surface of the first connecting plate 11 is provided with a raised plate 34, and the rotating block 33 is in sliding cooperation with the raised plate 34.

[0045] Preferably, the buffer plate 10 is further provided with a concave groove 39, and a toothed plate 40 is arranged in the concave groove 39, and one end of the sliding plate 32 is fixedly provided with a mounting block 36, and a threaded rod 37 is penetratingly arranged on the mounting block 36, and the threaded rod 37 is threadedly connected with the mounting block 36, and a rotating wheel 35 is fixedly arranged on the upper end of the threaded rod 37, and a limiting block 38 is rotatably connected to the lower end of the threaded rod 37, and the limiting block 38 is arranged in the concave groove 39, and the limiting block 38 is in cooperation with the toothed plate 40.

[0046] The working principle and beneficial effects of the above technical solution are as follows: when the sliding plate 32 is pushed to move along the sliding groove 41, the rotating block 33 hingedly connected to the upper end of the sliding plate 32 will move synchronously, and the rotating block 33 is in sliding cooperation with the raised plate 34 on the lower surface of the first connecting plate 11, and by adjusting the position of the sliding plate 32, the rotating block 33 can press or pull the raised plate 34, thereby changing the inclination angle of the first connecting plate 11, and then through the hinged linkage of the first connecting plate 11, the second connecting plate 12 and the third connecting plate 15, the height and angle of the positioning assembly are adjusted.

[0047] When the positioning assembly is in contact with the upper surface of the sleeve box 8, the rotating wheel 35 is rotated to drive the threaded rod 37 to rotate along the threaded hole of the mounting block 36, so that the limiting block 38 at the lower end of the threaded rod 37 moves downward along the concave groove 39 until the limiting block 38 is tightly engaged with the toothed plate 40 in the concave groove 39, and the toothed structure of the toothed plate 40 can limit the horizontal movement of the limiting block 38, thereby fixing the position of the sliding plate 32 in the sliding groove 41, avoiding displacement of the sliding plate 32 due to subsequent vibration or impact, and ensuring the posture stability of the three-link assembly and the positioning assembly;

[0048] By moving the sliding plate 32 along the sliding groove 41, cooperating the rotating block 33 and the raised plate 34, and hingedly linking the first connecting plate 11, the second connecting plate 12 and the third connecting plate 15, the angle of the three-link assembly is adjusted, thereby fine-tuning the height and inclination of the positioning assembly, realizing precise butt joint of the positioning assembly and the hanger 3, and being able to adapt to different models and specifications of the hanger 3; the engagement and locking structure of the limiting block 38 and the toothed plate 40 can firmly fix the position of the sliding plate 32, avoiding displacement of the sliding plate 32 due to vibration or impact after adjustment, thereby preventing the change of the posture of the three-link assembly, ensuring the positioning effect of the positioning assembly on the hanger 3, and being more practical.

[0049] Embodiment 5:

[0050] On the basis of the above-mentioned embodiment 4, as Figures 1-3As shown, the positioning assembly comprises a U-shaped plate 13, a threaded shaft 27 is rotatably arranged on the U-shaped plate 13, one end of the threaded shaft 27 is fixedly provided with a hand wheel 26, the threaded shaft 27 is threadedly connected with a positioning block 29, the positioning block 29 is slidably connected with the U-shaped plate 13, the hanger 3 is also symmetrically provided with a positioning hole two 14, the positioning hole two 14 is matched with the positioning block 29, and a threaded hole 28 is also formed in one side wall of the U-shaped plate 13.

[0051] The fixing block 17 is also fixedly provided with a linear driving piece 16, and the upper end of the linear driving piece 16 is matched with the lower surface of the U-shaped plate 13.

[0052] The working principle and beneficial effects of the above technical scheme are as follows: when the three-link assembly rotates, the linear driving piece 16 is started, and through cooperation with the three-link assembly, the output end of the linear driving piece 16 pushes upward the lower surface of the U-shaped plate 13, drives the U-shaped plate 13 and the threaded shaft 27 and the positioning block 29 on the plate to rise as a whole, until the upper surface of the U-shaped plate 13 contacts the sleeve box 8, at this time, the positioning block 29 and the positioning hole two 14 on the hanger 3 are just at the same horizontal height.

[0053] The hand wheel 26 at one end of the threaded shaft 27 is rotated, the hand wheel 26 drives the threaded shaft 27 to rotate on the U-shaped plate 13, and the threaded shaft 27 drives the positioning block 29 to slide along the inner wall of the U-shaped plate 13 when rotating, and then the positioning block 29 is accurately embedded in the positioning hole two 14 of the hanger 3, so that the hanger 3 is positioned and locked, and then a bolt is installed in the threaded hole 28, and the end of the bolt abuts against the positioning block 29, so that an additional fixed support is formed, and the positioning block 29 is prevented from being pulled out of the positioning hole two 14 under vibration or impact.

[0054] The position of the positioning block 29 is adjusted by the hand wheel 26 driving the threaded shaft 27, so that the positioning block 29 can be accurately embedded in the positioning hole two 14, and after the positioning block 29 is embedded in the positioning hole two 14, a rigid connection is formed, so that the displacement of the hanger 3 can be stably limited, and the positioning failure caused by vibration is avoided; the cooperation of the positioning block 29 and the positioning hole two 14, the support of the linear driving piece 16 to the U-shaped plate 13, and the reinforcement of the auxiliary bolt in the threaded hole 28 form a multiple positioning and fixing structure, which can effectively disperse the impact load transmitted by the hanger 3, and improve the impact resistance of the overall structure.

[0055] Embodiment 6:

[0056] On the basis of the above-mentioned embodiment 5, as shown, Figures 1-6 The positioning and buffering device further comprises a suction disc 18 matched with the sleeve two 6, the lower end of the suction disc 18 is throughly connected with an air pipe 20, the other end of the air pipe 20 is throughly connected with a box body 24, and the box body 24 is fixedly arranged on the lower surface of the sleeve box 8.

[0057] Preferably, the flexible sliding plate 19 is slidably arranged at one end of the sleeve 6 away from the suction cup 18, and is fixedly connected with the fixed block 17; the lower end of the flexible sliding plate 19 is fixedly provided with a connecting column 25; the lower end of the connecting column 25 is fixedly provided with an inclined plate 21; the lower side of the inclined plate 21 is fitted with an inclined block 22, which is slidably connected with the lower surface of the sleeve box 8.

[0058] Preferably, a buffer air pushing plate 31 is slidably arranged in the box 24; one end of the inclined block 22 is fixedly provided with a buffer air pushing rod 23, which is slidably extended into the box 24; the buffer air pushing plate 31 is fixedly connected with a spring 30.

[0059] The working principle and beneficial effects of the above technical solution are as follows: when the linear driving member 16 is started, the U-shaped plate 13 and the upper surface of the sleeve box 8 will give the buffer plate 10 an upward reaction force, thereby driving the buffer plate 10 to slide downward, the buffer plate 10 drives the fixed block 17 to descend, the fixed block 17 drives the flexible sliding plate 19 to synchronously descend, the flexible sliding plate 19 drives the lower end of the inclined plate 21 to move downward through the connecting column 25, the downward movement of the inclined plate 21 will be converted into the horizontal movement of the inclined block 22, the inclined block 22 in turn drives the buffer air pushing rod 23 to slide into the box 24; the buffer air pushing rod 23 drives the buffer air pushing plate 31 in the box 24 to increase the internal space, so that a negative pressure is formed in the box 24, the negative pressure is transmitted to the suction cup 18 through the air pipe 20 (penetrating the suction cup 18 and the box 24), and finally the suction cup 18 is tightly adsorbed on the outer wall of the sleeve 6, and the fixing is completed.

[0060] When the buffer air pushing plate 31 slides, the spring 30 fixed on one side of the buffer air pushing plate 31 will be deformed with the displacement of the buffer air pushing plate 31, and the impact energy transmitted by the inclined block 22 and the buffer air pushing rod 23 is absorbed through the elastic force, so as to weaken the influence of the vibration in the vertical direction on the box 24 and the sleeve box 8. Meanwhile, the spring 30 can have a certain buffering effect, in addition, when the sleeve 6 is impacted by the working medium to produce a small range of horizontal vibration, the suction cup 18 adsorbed with the sleeve 6 will slightly displace with the vibration, and the flexible sliding plate 19 slidably connected between the suction cup 18 and the fixed block 17 can offset part of the horizontal vibration energy through its flexible deformation and sliding characteristics, so as to avoid the direct transmission of the vibration to the fixed block 17 and the buffer plate 10, and realize the horizontal buffering protection.

[0061] It is obvious for those skilled in the art that the present application is not limited to the details of the above exemplary embodiments, and can be implemented in other specific forms without departing from the spirit or essential characteristics of the present application.

Claims

1. An erosion resistant spool piece, characterized by, The casing head body (5) is detachably provided with a flange (1), the casing head body (5) is provided with a hanger (3) at the top, the hanger (3) is provided with a casing I (2) and a casing II (6) at the top and bottom respectively, the casing head body (5) is provided with a positioning member (4), the positioning member (4) is used for positioning the hanger (3), the casing head body (5) comprises a casing box (8), the casing box (8) is provided with a positioning and buffering device, the positioning and buffering device is used for positioning the hanger (3), and the positioning and buffering device is used for buffering the casing II (6); The hanger (3) is provided with the casing I (2) at the top and the casing II (6) at the bottom; the positioning member (4) is provided with two, the positioning member (4) is symmetrically provided on the casing head body (5) and is in threaded connection with the casing head body (5), and the hanger (3) is provided with positioning holes I symmetrically on the left and right sides; The positioning and buffering device is provided with two, and the positioning and buffering device is symmetrically arranged in the casing box (8); the positioning and buffering device comprises a buffering member (9), the buffering member (9) is fixedly arranged on the inner wall of the lower side of the casing box (8), a buffering plate (10) is fixedly arranged at the upper end of the buffering member (9), the buffering plate (10) is in sliding connection with the inner wall of the casing box (8), the buffering plate (10) is provided with a three-link assembly, a positioning assembly is arranged at the upper end of the three-link assembly, and the positioning assembly is used for positioning the hanger (3); The three-link assembly comprises a fixed block (17), the fixed block (17) is fixedly arranged at one end of the buffering plate (10) away from the inner wall of the casing box (8), a first connecting plate (11) is hingedly connected to the fixed block (17), a second connecting plate (12) is hingedly connected to the first connecting plate (11), a third connecting plate (15) is hingedly connected to the second connecting plate (12), and the positioning assembly is hingedly connected to the third connecting plate (15); The buffering plate (10) is provided with a sliding groove (41), a sliding plate (32) is slidably arranged in the sliding groove (41), a rotating block (33) is hingedly connected to the upper end of the sliding plate (32), and a convex plate (34) is arranged on the lower surface of the first connecting plate (11); the rotating block (33) is in sliding connection with the convex plate (34).

2. A scour resistant bushing head according to claim 1, wherein, The buffering plate (10) is further provided with a concave groove (39), the concave groove (39) is provided with a toothed plate (40), one end of the sliding plate (32) is fixedly provided with a mounting block (36), a threaded rod (37) is arranged in the mounting block (36) and is in threaded connection with the mounting block (36), a rotating wheel (35) is fixedly arranged at the upper end of the threaded rod (37), a limiting block (38) is rotatably connected to the lower end of the threaded rod (37), the limiting block (38) is arranged in the concave groove (39) and is in cooperation with the toothed plate (40).

3. A scour resistant bushing head according to claim 1, wherein, The positioning assembly comprises a U-shaped plate (13), a threaded shaft (27) is rotatably arranged on the U-shaped plate (13), one end of the threaded shaft (27) is fixedly provided with a hand wheel (26), the threaded shaft (27) is threadedly connected with a positioning block (29), the positioning block (29) is slidably connected with the U-shaped plate (13), the hanger (3) is further symmetrically provided with a positioning hole two (14), the positioning hole two (14) is matched with the positioning block (29), a threaded hole (28) is further formed in one side wall of the U-shaped plate (13); The fixing block (17) is further fixedly provided with a linear driving element (16), and the upper end of the linear driving element (16) is matched with the lower surface of the U-shaped plate (13).

4. A scour resistant bushing head according to claim 1, wherein, The positioning buffer device further comprises a suction disc (18), the suction disc (18) is matched with the sleeve two (6), the lower end of the suction disc (18) is throughly connected with an air pipe (20), the other end of the air pipe (20) is throughly connected with a box body (24), and the box body (24) is fixedly arranged on the lower surface of the sleeve box (8).

5. A scour resistant bushing head according to claim 4, wherein, The end, away from the sleeve two (6), of the suction disc (18) is slidably provided with a flexible sliding plate (19), the flexible sliding plate (19) is fixedly connected with the fixing block (17), the lower end of the flexible sliding plate (19) is fixedly provided with a connecting column (25), the lower end of the connecting column (25) is fixedly provided with an inclined plate (21), the lower side of the inclined plate (21) is matched with an inclined block (22), and the inclined block (22) is slidably connected with the lower surface of the sleeve box (8).

6. A scour resistant sleeve head according to claim 5, characterised in that, The box body (24) is slidably provided with a buffer air pushing plate (31), one end of the inclined block (22) is fixedly provided with a buffer air pushing rod (23), the buffer air pushing rod (23) is slidably extended into the box body (24), and the buffer air pushing plate (31) is fixedly connected with a spring (30).

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