Quick connecting device for wellhead device

Abstract

The invention relates to the technical field of drilling equipment, in particular to a quick connecting device for a wellhead device, which comprises a base and an oil pipe coaxially arranged on one side of the base, two semicircular adjusting semi-rings are slidably connected to the base, and the two adjusting semi-rings are oppositely arranged and can be butted to form a circular adjusting ring; the side, opposite to the oil pipe, of the adjusting semi-ring is provided with a first adjusting slope, the outer side of the oil pipe is sleeved with a limiting ring, and the side, opposite to the limiting ring, of the adjusting semi-ring is provided with a second adjusting slope. And the human input and the capital cost are reduced.

Description

Technical Field

[0001] The invention relates to the technical field of drilling equipment, and in particular to a quick connection device for a wellhead device. Background Art

[0002] At the drilling and completion site, in order to meet the drilling team's requirements for the bottom baseline height of the operating blowout preventer, it is necessary to prepare rising flanges of various height specifications. During the actual installation process, the upper and lower joints between the flanges are usually clamped with sealing gaskets to ensure sealing. However, due to the large number of sealing gaskets used and the slight difference in the tightness of the bolts, the actual height of the wellhead device after installation is quite different from the theoretical height of the sum of the rising flanges. Under special working conditions with strict installation and use requirements, if the installation height is significantly different before and after, it needs to be disassembled and readjusted. However, on-site installation and disassembly is time-consuming and labor-intensive, which greatly affects the installation efficiency, and also increases manpower investment and capital costs.

[0003] Therefore, it is necessary to design a quick connection device for the wellhead device to solve the problem of repeatedly disassembling and adjusting the height of the wellhead device due to different heights. Summary of the invention

[0004] The purpose of the present invention is to overcome the problem that the theoretical height of the existing wellhead device before installation is quite different from the actual height after installation, which leads to the need to disassemble and readjust the height. A quick connection device for the wellhead device is now proposed.

[0005] The technical solution adopted by the present invention to solve the technical problem is: A quick connection device for a wellhead device comprises a base and an oil pipe coaxially arranged on one side of the base, two semicircular adjusting half rings are slidably connected to the base, the two adjusting half rings are arranged opposite to each other and can be butted together to form a circular adjusting ring, a first adjusting inclined surface is arranged on the side of the adjusting half ring opposite to the oil pipe, a limiting ring is sleeved on the outer side of the oil pipe, and a second adjusting inclined surface is arranged on the side of the adjusting half ring opposite to the limiting ring; One end of the oil pipe deviating from the adjusting half ring is connected with a nut seat through external thread meshing, and a bevel gear ring which is rotatably connected to the base and driven to rotate by the driving wheel is sleeved on the outer side of the nut seat, and the bevel gear ring and the nut seat are fixed by a connecting cover plate which is rotatably connected to the base, and the connecting cover plate is arranged on the side of the bevel gear ring which deviates from the limiting ring, and the bevel gear ring drives the nut seat to rotate so as to lift the oil pipe; A first height-adjustable limit screw is provided on the connecting cover plate. The first limit screw passes between the bevel gear ring and the nut seat and contacts the end of the limit ring away from the adjusting half ring, thereby tightening the limit ring and the second adjusting inclined surface.

[0006] Furthermore, a tightening mechanism is provided on the base for tightening the adjusting half ring and the oil pipe, the tightening mechanism includes a second limit screw, a sliding sleeve, a sliding rod and a spring, the sliding sleeve is slidably connected to the base, the sliding rod is located in the sliding sleeve and can slide axially, the spring is sleeved on the outside of the sliding rod and is located between the sliding sleeve and the adjusting half ring. When the oil pipe is subjected to pressure from the entire equipment, the adjusting half ring slidably connected to the base will be subjected to pressure from the oil pipe transmitted from the first adjusting inclined surface, causing the adjusting half ring to slide relative to the base and away from the oil pipe. The tightening mechanism can limit the adjusting half ring and give the adjusting half ring an opposite force so that it can always tighten the oil pipe to prevent the oil pipe from dropping under pressure.

[0007] Furthermore, an annular channel is reserved between the bevel gear ring and the nut seat for the passage of the first limit screw and the limit ring, a fixing groove is opened in the annular channel on one side close to the connecting cover plate, a fixing sleeve is sleeved on the first limit screw, the fixing sleeve is located in the fixing groove, the width of the annular channel matches the thickness of the limit ring, the diameter of the fixing groove matches the diameter of the fixing sleeve and is greater than the thickness of the limit ring, the first limit screw and the limit ring cooperate to play an extrusion limiting role on the adjusting half ring, and then play a pressure limiting role on the oil pipe. In order to improve the utilization rate of the internal space, the design between the various components is very compact. When the oil pipe needs to adjust the height, it is necessary to first move the position of the adjusting half ring, and then adjust the height of the second adjusting bevel. When the surface is moved, the limit ring will rise or fall accordingly, so enough space needs to be reserved to meet the lifting and lowering of the limit ring. The annular channel can allow the limit ring to rise and fall, and the first limit screw can also tighten and limit the limit ring through the annular channel. In order to avoid the first limit screw from shaking in the annular channel due to different sizes, the additional fixing sleeve can fill the size difference between the first limit screw and the annular channel, so that the first limit screw can be stabilized in the annular channel. In addition, a fixing groove is provided in the annular channel to accommodate the fixing sleeve, and the diameter of the fixing sleeve is larger than the thickness of the limit ring, so that the fixing sleeve can also limit the lifting and lowering stroke of the limit ring to prevent the limit ring from moving excessively and damaging the internal structure.

[0008] Furthermore, a first inclined surface matching the first adjusting surface is provided on the oil pipe at one end opposite to the first adjusting surface, and a second inclined surface matching the second adjusting surface is provided on the limit ring at one end opposite to the second adjusting surface. Sealing rings are provided on both the first adjusting surface and the second adjusting surface. The first inclined surface and the second inclined surface can better match the first adjusting surface and the second adjusting surface, thereby increasing the contact area between the two, while increasing friction and better installing the sealing ring.

[0009] Furthermore, a sealing ring is sleeved outside the oil pipe. The sealing ring is located between the limiting ring and the oil pipe. A support plane is provided on the side of the adjusting half-ring opposite to the sealing ring. Sealing rings are arranged on both the inner and outer sides of the sealing ring. The sealing ring can fill the gap between the oil pipe and the limiting ring, effectively prevent the oil pipe from directly squeezing against the limiting ring, and can play a good supplementary role in sealing on both sides. The sealing rings arranged on both sides of the sealing ring can seal between the limiting ring and the sealing ring, and can also seal between the oil pipe and the sealing ring, improving the sealing performance and preventing oil leakage.

[0010] Furthermore, a first support ring and a second support ring are formed on the base and extend along the axis towards the side where the oil pipe is located. The first support ring is located outside the limiting ring, and the second support ring is located between the first support ring and the limiting ring. The second limiting screw penetrates through the first support ring and is threadedly connected to the first support ring. The sliding sleeve penetrates through the second support ring and is slidably connected to the second support ring. The first support ring and the second support ring are support shells fixedly connected to the base, which can provide a support carrier for other movable components on the base.

[0011] Furthermore, the bevel gear ring is slidably connected to the second support ring through a sliding bearing. A gap for accommodating the sliding bearing is left between the second support ring and the limiting ring. A third support ring fixedly connected to the second support ring is provided in this gap. The third support ring is located between the sliding bearing and the tightening mechanism to separate the two. On the one hand, the third support ring can fill the gap generated by accommodating the sliding bearing. On the other hand, it can also play a role in protecting and sealing key components such as the internal adjusting half-ring and the tightening mechanism, achieving isolation from the outside world, and at the same time preventing the lubricating oil of the sliding bearing from entering the interior and avoiding contamination.

[0012] Furthermore, the driving wheel is located between the first support ring and the second support ring and is rotatably connected to both of them. A rotating handwheel is provided outside the first support ring. The rotating handwheel passes through the first support ring and is coaxially fixedly connected to the driving wheel. The rotating handwheel is manually operated by the staff to rotate, thereby driving the driving wheel to rotate. The driving wheel is preferably a bevel gear. Through the rotating handwheel and the driving wheel, the staff can flexibly adjust the lifting height of the oil pipe according to the difference between the actual installation height and the theoretical installation height, so as to meet the installation requirements and greatly improve the convenience.

[0013] Furthermore, the acute angle between the first adjusting inclined plane and the horizontal plane is greater than 45 degrees, and the acute angle between the second adjusting inclined plane and the horizontal plane is less than 45 degrees, which can make the adjustment of the lifting height of the oil pipe more sensitive, and can make the adjusting half-ring move a shorter distance. And the angle design of the second adjusting inclined plane can make the adjusting distances of the first limiting screw and the second limiting screw smaller, which is convenient for operation.

[0014] Furthermore, a guide rail is installed on the base. The adjusting semi-ring is slidably connected to the base through the guide rail, and the connecting cover plate is fixedly connected to both the bevel gear ring and the nut seat by fixing screws.

[0015] A quick connection device for a wellhead device according to the present invention drives the bevel gear ring to rotate through the driving wheel, and then the bevel gear ring drives the nut seat to rotate. The nut seat realizes the adjustment of the lifting height of the oil pipe through threaded meshing transmission. When the actual height after the installation of the wellhead device is quite different from the preset height before installation, the installation requirements can be met by lifting and lowering the oil pipe. After the height of the oil pipe is adjusted, first adjust the tightening mechanism to tighten the adjusting semi-ring outside the oil pipe against the oil pipe, so that the first adjusting inclined surface contacts the oil pipe, completing the primary limit of the adjusting semi-ring. Then adjust the first limit screw to push the limit ring into contact with the second adjusting inclined surface, so that the limit ring is tightened against the adjusting semi-ring, completing the secondary limit of the adjusting semi-ring. Compared with the traditional technology, the technical solution of the present invention is convenient for adjusting the height of the oil pipe, without repeatedly disassembling the equipment nuts, improving the installation efficiency, reducing the labor input and capital cost. Brief Description of the Drawings

[0016] Figure 1 is a schematic half-sectional structure diagram of the present invention; Figure 2 is a locking state diagram of the present invention when the oil pipe is at a high position; Figure 3 is a state diagram of the present invention when the oil pipe descends; Figure 4 is a locking state diagram of the present invention when the oil pipe is at a low position; Figure 5 is of the present invention Figure 1 partial enlarged view at A in; Figure 6 is of the present invention Figure 1 partial enlarged view at B in.

[0017] Reference Signs: 1, base; 2, oil pipe; 3, adjusting semi-ring; 4, fixing screw; 5, first adjusting inclined surface; 6, second adjusting inclined surface; 7, limit ring; 8, nut seat; 9, bevel gear ring; 10, connecting cover plate; 11, driving wheel; 12, first limit screw; 13, tightening mechanism; 14, second limit screw; 15, sliding sleeve; 16, sliding rod; 17, spring; 18, annular channel; 19, fixing groove; 20, fixing sleeve; 21, first inclined surface; 22, second inclined surface; 23, sealing ring; 24, blocking ring; 25, supporting plane; 26, first supporting ring; 27, second supporting ring; 28, third supporting ring; 29, sliding bearing; 30, rotating handwheel; 31, guide rail. Detailed Description of the Invention

[0018] In order to make the purpose, technical solution and advantages of the embodiments of the present invention more clear, the technical solution in the embodiments of the present invention is clearly and completely described below in conjunction with the accompanying drawings.

[0019] Embodiment 1: like Figure 1 and Figure 5 As shown, the present embodiment provides a quick connection device for a wellhead device, comprising a base 1 and an oil pipe 2 coaxially arranged on one side of the base 1, two semicircular adjusting half rings 3 are slidably connected to the base 1, the two adjusting half rings 3 can move horizontally along the guide rail 31, the two adjusting half rings 3 are arranged opposite to each other and can be butted together to form a circular adjusting ring, and a first adjusting inclined surface 5 is provided on the side of the adjusting half ring 3 opposite to the oil pipe 2; a limiting ring 7 is sleeved on the outer side of the oil pipe 2, the limiting ring 7 is annular, and can be formed by splicing multiple parts, or it can be a whole, a second adjusting inclined surface 6 is provided on the side of the adjusting half ring 3 opposite to the limiting ring 7, and one end of the oil pipe 2 away from the adjusting half ring 3 is connected to a nut seat 8 through an external thread meshing, and the outer side of the nut seat 8 is sleeved with a nut seat 8 that is rotatably connected to the base 1 The bevel gear ring 9 is connected and driven to rotate by the driving wheel 11. The bevel gear ring 9 is in the shape of a circular ring, and the connecting cover plate 10 is in the shape of a disc. The bevel gear ring 9 and the nut seat 8 are fixed by the connecting cover plate 10 rotatably connected to the base 1. The outer edge of the connecting cover plate 10 is clamped into the end of the first support ring 26, and the clamping point is rotatably connected through a rolling bearing. The connecting cover plate 10 is arranged on the side of the bevel gear ring 9 away from the limit ring 7. The bevel gear ring 9 drives the nut seat 8 to rotate and thus the oil pipe 2 is raised and lowered. A first limit screw 12 with adjustable height is provided on the connecting cover plate 10. The first limit screw 12 passes between the bevel gear ring 9 and the nut seat 8 and contacts with the end of the limit ring 7 away from the adjusting half ring 3, thereby tightening the limit ring 7 to the second adjusting inclined surface 6. Preferably, the bevel gear ring 9 is in the shape of a circular ring, and its cross section is an inverted right-angled trapezoid.

[0020] Preferably, Figure 1 As shown, a tightening mechanism 13 for tightening the adjusting half ring 3 and the oil pipe 2 is provided on the base 1, and the tightening mechanism 13 includes a second limit screw 14, a sliding sleeve 15, a sliding rod 16 and a spring 17. The sliding sleeve 15 is connected to the base 1 by sliding, the sliding rod 16 is located in the sliding sleeve 15 and can slide axially, and the spring 17 is sleeved on the outside of the sliding rod 16 and is located between the sliding sleeve 15 and the adjusting half ring 3. When the oil pipe 2 is subjected to pressure from the entire equipment, the adjusting half ring 3 slidingly connected to the base 1 will be subjected to the pressure of the oil pipe 2 transmitted from the first adjusting inclined surface 5, so that the adjusting half ring 3 slides relative to the base 1 and away from the oil pipe 2. The tightening mechanism 13 can limit the adjusting half ring 3 and give the adjusting half ring 3 an opposite force so that it can always tighten the oil pipe 2 to prevent the oil pipe 2 from dropping under pressure.

[0021] Preferably, Figure 1 and Figure 6As shown, an annular channel 18 is reserved between the bevel gear ring 9 and the nut seat 8 for the first limit screw 12 and the limit ring 7 to pass through, and a fixing groove 19 is opened in the annular channel 18 on the side close to the connecting cover plate 10. A fixing sleeve 20 is sleeved on the first limit screw 12, and the fixing sleeve 20 is cylindrical and located in the fixing groove 19. The width of the annular channel 18 matches the thickness of the limit ring 7, and the diameter of the fixing groove 19 matches the diameter of the fixing sleeve 20 and is greater than the thickness of the limit ring 7. The first limit screw 12 cooperates with the limit ring 7 to play an extrusion limiting role on the adjusting half ring 3, and then play a pressure limiting role on the oil pipe 2. In order to improve the internal space utilization rate, the components are designed to be very compact. When the oil pipe 2 needs to adjust the height, it is necessary to first move the position of the adjusting half ring 3, and then move the second When the inclined plane 6 is adjusted, the limit ring 7 will rise or fall accordingly, so it is necessary to leave enough space to meet the lifting and lowering of the limit ring 7. The annular channel 18 can be used for the lifting and lowering of the limit ring 7, and the first limit screw 12 can also tighten and limit the limit ring 7 through the annular channel 18. In order to avoid the first limit screw 12 from shaking in the annular channel 18 due to different sizes, the additional fixing sleeve 20 can fill the size difference between the first limit screw 12 and the annular channel 18, so that the first limit screw 12 is stable in the annular channel 18. In addition, a fixing groove 19 is provided in the annular channel 18 to accommodate the fixing sleeve 20, and the diameter of the fixing sleeve 20 is greater than the thickness of the limit ring 7, so that the fixing sleeve 20 can also limit the lifting and lowering stroke of the limit ring 7 to prevent the limit ring 7 from moving excessively and damaging the internal structure.

[0022] Preferably, Figure 5 As shown, the end of the oil pipe 2 opposite to the first adjusting bevel 5 is provided with a first inclined surface 21 matching the first adjusting bevel 5, and the end of the limiting ring 7 opposite to the second adjusting bevel 6 is provided with a second inclined surface 22 matching the second adjusting bevel 6. The first adjusting bevel 5 and the second adjusting bevel 6 are both provided with sealing rings 23. The first inclined surface 21 and the second inclined surface 22 can better match the first adjusting bevel 5 and the second adjusting bevel 6, increase the contact area between the two, and at the same time increase the friction and better install the sealing ring 23.

[0023] Preferably, Figure 1 and Figure 5As shown, a sealing ring 24 is sleeved outside the oil pipe 2. The sealing ring 24 is circular ring-shaped and is located between the limit ring 7 and the oil pipe 2. A support plane 25 is provided on the side of the adjusting half-ring 3 opposite to the sealing ring 24. Sealing rings 23 are arranged on both the inner and outer sides of the sealing ring 24. The sealing ring 24 can fill the gap between the oil pipe 2 and the limit ring 7, effectively avoid direct extrusion between the oil pipe 2 and the limit ring 7, and can play a good supplementary role in sealing on both sides. The sealing rings 23 arranged on both sides of the sealing ring 24 can seal between the limit ring 7 and the sealing ring 24, and can also seal between the oil pipe 2 and the sealing ring 24, improving the sealing performance and preventing oil leakage.

[0024] Preferably, as Figure 1 shown, a first support ring 26 and a second support ring 27 are formed on the base 1 extending along the axis towards the side where the oil pipe 2 is located. The first support ring 26 is located outside the limit ring 7, and the second support ring 27 is located between the first support ring 26 and the limit ring 7. The second limit screw 14 passes through the first support ring 26 and is threadedly connected to the first support ring 26. The sliding sleeve 15 passes through the second support ring 27 and is slidably connected to the second support ring 27. The first support ring 26 and the second support ring 27 are support shells fixedly connected to the base 1, which can provide a support carrier for other movable components on the base 1. The first support ring 26 and the second support ring 27 are fixedly connected to the base 1 by screws, and both the first support ring 26 and the second support ring 27 are circular ring-shaped.

[0025] Preferably, as Figure 6 shown, the bevel gear ring 9 is slidably connected to the second support ring 27 through a sliding bearing 29. A gap for accommodating the sliding bearing 29 is left between the second support ring 27 and the limit ring 7. A third support ring 28 fixedly connected to the second support ring 27 by screws is provided in this gap. The third support ring 28 is located between the sliding bearing 29 and the tightening mechanism 13 to separate the two. On the one hand, the third support ring 28 can fill the gap generated by accommodating the sliding bearing 29. On the other hand, it can also play a role in protecting and sealing key components such as the internal adjusting half-ring 3 and the tightening mechanism 13, realizing isolation from the outside world, and at the same time preventing the lubricating oil of the sliding bearing 29 from entering the interior to avoid pollution. Preferably, the third support ring 28 is circular ring-shaped.

[0026] Preferably, as Figure 1As shown, the driving wheel 11 is located between the first support ring 26 and the second support ring 27 and is rotationally connected to both of them through bearings. A rotating handwheel 30 is provided on the outer side of the first support ring 26. The rotating handwheel 30 passes through the first support ring 26 and is fixedly connected to the driving wheel 11 by a coaxial screw. The rotating handwheel 30 is manually operated by the staff to rotate, thereby driving the driving wheel 11 to rotate. The driving wheel 11 is preferably a bevel gear. Through the rotating handwheel 30 and the driving wheel 11, the staff can flexibly adjust the lifting height of the oil pipe 2 according to the difference between the actual installation height and the theoretical installation height, so as to meet the installation requirements and greatly improve the convenience.

[0027] Preferably, as Figure 5 shown, the acute angle between the first adjusting inclined surface 5 and the horizontal plane is greater than 45 degrees, and the acute angle between the second adjusting inclined surface 6 and the horizontal plane is less than 45 degrees, which can make the adjustment of the lifting height of the oil pipe 2 more sensitive and can make the adjusting half-ring 3 move a shorter distance. And the angle design of the second adjusting inclined surface 6 can make the adjusting distances of the first limit screw 12 and the second limit screw 14 smaller, which is convenient for operation.

[0028] Preferably, as Figure 1 shown, a guide rail 31 is installed on the base 1. The adjusting half-ring 3 is slidably connected to the base 1 through the guide rail 31. The connecting cover plate 10 is fixedly connected to both the bevel gear ring 9 and the nut seat 8 by fixing screws 4.

[0029] The working principle and process of the present invention are as follows: Assume that the height of the oil pipe 2 is too high after the wellhead device is installed and the height of the oil pipe 2 needs to be reduced. As Figure 2 shown, at this time, the oil pipe 2 is at a high position, and both the first limit screw 12 and the second limit screw 14 are in a locked state. One end of the sliding sleeve 15 abuts against the adjusting half-ring 3, and the other end is abutted against by the second limit screw 14. The spring 17 has been compressed because it is under greater pressure at this time, and the sliding rod 16 has completely entered the sliding sleeve 15. When starting to adjust, as Figure 3 shown, loosen the first limit screw 12 and the second limit screw 14. At this time, the first limit screw 12 is separated from the limit ring 7. Then, manually operate the rotating handwheel 30. The power is sequentially transmitted to the nut seat 8 through the driving wheel 11, the bevel gear ring 9 and the connecting cover plate 10, driving the nut seat 8 to rotate. Since the connecting cover plate 10 is fixedly connected to the nut seat 8, and the connecting cover plate 10 is also fixed on the first support ring 26 and is rotationally connected thereto, the nut seat 8 will not move axially and will rotate in place to drive the oil pipe 2 to move axially, causing the oil pipe 2 to descend. The descending oil pipe 2 will squeeze the two adjusting half-rings 3 through the first adjusting inclined surface 5, causing the two adjusting half-rings 3 to move away from the oil pipe 2. The adjusting half-ring 3 squeezes the limit ring 7 to rise through the second adjusting inclined surface 6 thereon. As Figure 4As shown, after the height of the oil pipe 2 is adjusted, first adjust the second limit screw 14, the tightening mechanism 13 will tighten the adjusting half ring 3, and then adjust the first limit screw 12 to tighten the limit ring 7, and the limit ring 7 will tighten and squeeze the adjusting half ring 3 to fix it, thereby achieving fixation of the adjusting half ring 3 in two different directions, ensuring the force and structural stability of the oil pipe 2, and the height adjustment of the oil pipe 2 is now completed.

[0030] The present invention provides a quick connection device for a wellhead device, which drives the bevel gear ring 9 to rotate through the active wheel 11, and then the bevel gear ring 9 drives the nut seat 8 to rotate. The nut seat 8 realizes the lifting and lowering height adjustment of the oil pipe 2 through threaded engagement transmission. When the actual height of the wellhead device after installation is greatly different from the preset height before installation, the installation requirements can be met by lifting the oil pipe 2. After the height adjustment of the oil pipe 2 is completed, the tightening mechanism 13 is adjusted first to tighten the adjusting semi-ring 3 on the outside of the oil pipe 2 to the oil pipe 2 so that the first adjusting inclined surface 5 contacts the oil pipe 2 to complete the primary limit of the adjusting semi-ring 3, and then the first limiting screw 12 is adjusted to push the limiting ring 7 to contact the second adjusting inclined surface 6 so that the limiting ring 7 is tightened against the adjusting semi-ring 3 to complete the secondary limit of the adjusting semi-ring 3. Compared with the traditional technology, the technical solution is convenient for adjusting the height of the oil pipe 2, and there is no need to repeatedly disassemble the equipment nut, thereby improving the installation efficiency and reducing the manpower investment and capital cost.

[0031] The above-mentioned specific implementation modes are only specific cases of the present invention. The patent protection scope of the present invention includes but is not limited to the above-mentioned specific implementation modes. Any appropriate changes or modifications made thereto by any ordinary technician in the technical field in accordance with the claims of the present invention shall fall within the patent protection scope of the present invention.

Claims

1. A quick connection device for a wellhead device, comprising a base (1) and a tubing (2) coaxially arranged on one side of the base (1), characterized in that: Two semi-circular adjusting half-rings (3) are slidably connected to the base (1). The two adjusting half-rings (3) are arranged opposite to each other and can be butted to form a circular adjusting ring. A first adjusting inclined surface (5) is provided on the side of the adjusting half-ring (3) facing the oil pipe (2). A limiting ring (7) is sleeved outside the oil pipe (2). A second adjusting inclined surface (6) is provided on the side of the adjusting half-ring (3) facing the limiting ring (7). One end of the oil pipe (2) facing away from the adjusting half-ring (3) is threadedly engaged with a nut seat (8) through an external thread. A bevel gear ring (9) that is rotatably connected to the base (1) and driven to rotate by a driving wheel (11) is sleeved outside the nut seat (8). The bevel gear ring (9) and the nut seat (8) are fixed by a connecting cover plate (10) that is rotatably connected to the base (1). The connecting cover plate (10) is arranged on the side of the bevel gear ring (9) facing away from the limiting ring (7). The bevel gear ring (9) drives the nut seat (8) to rotate, thereby lifting and lowering the oil pipe (2). The connecting cover plate (10) is provided with a first limiting screw (12) with adjustable height. The first limiting screw (12) passes between the bevel gear ring (9) and the nut seat (8) and contacts the end of the limiting ring (7) facing away from the adjusting half-ring (3), thereby pressing the limiting ring (7) against the second adjusting inclined surface (6).

2. The quick connection device for a wellhead assembly according to claim 1, characterized in that: A tightening mechanism (13) for pressing the adjusting half-ring (3) against the oil pipe (2) is provided on the base (1). The tightening mechanism (13) includes a second limiting screw (14), a sliding sleeve (15), a sliding rod (16), and a spring (17). The sliding sleeve (15) is slidably connected to the base (1). The sliding rod (16) is located inside the sliding sleeve (15) and can slide axially. The spring (17) is sleeved outside the sliding rod (16) and is located between the sliding sleeve (15) and the adjusting half-ring (3).

3. The quick connection device for a wellhead device according to claim 1, characterized in that: An annular channel (18) for the first limiting screw (12) and the limiting ring (7) to pass through is left between the bevel gear ring (9) and the nut seat (8). A fixing groove (19) is opened on one side of the annular channel (18) close to the connecting cover plate (10). A fixing sleeve (20) is sleeved on the first limiting screw (12). The fixing sleeve (20) is located in the fixing groove (19). The width of the annular channel (18) matches the thickness of the limiting ring (7). The diameter of the fixing groove (19) matches the diameter of the fixing sleeve (20) and is larger than the thickness of the limiting ring (7).

4. The quick connection device for the wellhead device according to claim 1, wherein: One end of the oil pipe (2) opposite to the first adjusting inclined surface (5) is provided with a first inclined surface (21) that matches the first adjusting inclined surface (5). One end of the limiting ring (7) opposite to the second adjusting inclined surface (6) is provided with a second inclined surface (22) that matches the second adjusting inclined surface (6). Sealing rings (23) are provided on both the first adjusting inclined surface (5) and the second adjusting inclined surface (6).

5. The quick connection device for a wellhead device according to claim 1, characterized in that: A blocking ring (24) is sleeved outside the oil pipe (2). The blocking ring (24) is located between the limiting ring (7) and the oil pipe (2). A supporting plane (25) is provided on the side of the adjusting half-ring (3) opposite to the blocking ring (24). Sealing rings (23) are provided on both the inner and outer sides of the blocking ring (24).

6. The quick connection device for a wellhead device according to claim 2, characterized in that: The upper edge of the base (1) extends along the axis towards the side where the oil pipe (2) is located to form a first support ring (26) and a second support ring (27). The first support ring (26) is located outside the limit ring (7), and the second support ring (27) is located between the first support ring (26) and the limit ring (7). The second limit screw (14) passes through the first support ring (26) and is threadedly connected to the first support ring (26). The sliding sleeve (15) passes through the second support ring (27) and is slidably connected to the second support ring (27).

7. The quick connection device for a wellhead device according to claim 6, characterized in that: The bevel gear ring (9) is slidably connected to the second support ring (27) through a sliding bearing (29). A gap for accommodating the sliding bearing (29) is left between the second support ring (27) and the limit ring (7). A third support ring (28) fixedly connected to the second support ring (27) is provided in this gap. The third support ring (28) is located between the sliding bearing (29) and the tightening mechanism (13) to separate the two.

8. The quick connection device for a wellhead device according to claim 6, characterized in that: The driving wheel (11) is located between the first support ring (26) and the second support ring (27) and is rotatably connected to both. A rotating handwheel (30) is provided outside the first support ring (26). The rotating handwheel (30) passes through the first support ring (26) and is coaxially fixedly connected to the driving wheel (11).

9. The quick connection device for a wellhead device according to claim 1, characterized in that: The acute angle between the first adjusting inclined plane (5) and the horizontal plane is greater than 45 degrees, and the acute angle between the second adjusting inclined plane (6) and the horizontal plane is less than 45 degrees.

10. The quick connection device for a wellhead device according to claim 1, characterized in that: A guide rail (31) is installed on the base (1). The adjusting half-ring (3) is slidably connected to the base (1) through the guide rail (31). The connecting cover plate (10) is fixedly connected to both the bevel gear ring (9) and the nut seat (8) through the fixing screw (4).

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