Ultrahigh pressure casing head with detachable function

Abstract

The invention discloses an ultrahigh pressure casing head with a detachable function, and belongs to the technical field of casing heads. The ultrahigh pressure casing head comprises a casing main body, a mounting through opening is formed in the casing main body, and the left side and the right side of the casing main body communicate with valve bodies; when a casing main body and a conveying pipe are mounted in the petroleum drilling process, a clamping block and a first sliding groove are utilized, the clamping block can gradually move close to a mounting barrel under the action of the first sliding groove when moving upwards in the first sliding groove, then the clamping block can gradually move into a clamping groove along a positioning block, the positioning block is compressed, and the conveying pipe is mounted in the clamping groove; the clamping block can stably clamp the mounting cylinder, the clamping fastening degree between the clamping block and the mounting cylinder is adjusted by adjusting the position of the clamping block through the adjusting rod, the clamping block is used for clamping and fixing the fixing cylinder, mounting and dismounting can be rapidly and conveniently carried out, tedious operation is not needed, and the practicability is high. And the time for mounting and dismounting is shortened.

Description

Technical Field

[0001] The invention relates to the technical field of casing heads, in particular to an ultra-high voltage casing head with a detachable function. Background Art

[0002] Casing heads are commonly used in the process of oil and natural gas extraction. They are installed on the upper end of the surface casing string to fix the wellhead of the drilled well and connect the wellhead casing string to support the connection components of the technical casing and the oil layer casing. They can be used to seal the annular space between the layers of pipes and provide a transition connection for the installation of blowout preventers, tubing heads, and Christmas trees. In addition, through the two side ports on the casing head body, construction operations such as squeezing mud, monitoring, and adding balancing fluid can be carried out.

[0003] In the process of oil drilling, the casing head is usually installed at the wellhead to fix the casing string. The casing head and the casing string are generally installed together by threads. The casing string needs to be rotated during the installation and removal process of the casing string, and the removal is cumbersome and time-consuming. The casing string is generally long. When installing and removing the casing string, the casing string is easy to shake, causing movement between the end of the casing string and the casing head, thereby deforming the threads at the end of the casing string, affecting the subsequent installation of the casing string. In addition, during the long-term operation of the casing string, the connection position between the casing string and the casing head is easy to loosen due to vibration, thereby affecting the normal operation of the casing string. Summary of the invention

[0004] The object of the present invention is to provide an ultra-high voltage casing head with a detachable function to solve the problems raised in the above background technology.

[0005] To achieve the above-mentioned purpose, the present invention provides the following technical solutions: an ultra-high pressure casing head with a detachable function, comprising a casing body, an installation port is opened inside the casing body, valve bodies are connected to the left and right sides of the casing body, a pressure gauge is connected to the surface of the valve body on one side, a delivery pipe is arranged in the installation port, a sealing mechanism is arranged on the surface of the delivery pipe, the sealing mechanism is used to seal between the delivery pipe and the casing body, an installation clamping mechanism is arranged on the surface of the delivery pipe, the installation clamping mechanism is used to keep the delivery pipe fixed when the delivery pipe is installed, a limiting mechanism is arranged inside the casing body, the limiting mechanism is used to limit the end of the delivery pipe, an adjusting mechanism is arranged on the surface of the casing body, the adjusting mechanism is used to adjust the clamping and tightening degree of the installation clamping mechanism, a tightening mechanism is arranged at the bottom of the adjusting mechanism, and the tightening mechanism is used to support and tighten the delivery pipe by the limiting mechanism during the process of the adjusting mechanism adjusting the clamping and tightening degree of the installation clamping mechanism.

[0006] As a further solution of the present invention, the sealing mechanism includes a fixing ring fixedly connected to the surface of the conveying pipe, a ring-mounted sealing strip fixedly connected to the surface of the fixing ring, and the sealing strip is in contact with the inner wall of the installation opening.

[0007] As a further solution of the present invention, the installation and clamping mechanism includes an installation tube, which slides on the surface of the conveying tube, and the surface of the conveying tube has a stepped groove. The upper end of the installation tube extends inward, and an annular clamping groove is provided on the surface of the installation tube. An annular first slide groove is provided in the installation opening, and the inner wall of the first slide groove away from the installation tube is an inclined surface. A plurality of arc-shaped clamping blocks are slidably connected in the first slide groove, and the clamping block is located in the clamping groove. A plurality of the clamping blocks are arranged in a circle at equal angles, and an elastically retractable positioning block is fixedly connected to the surface of the clamping block, and the upper and lower sides of the positioning block close to one end of the conveying tube are both inclined surfaces.

[0008] As a further solution of the present invention, the limiting mechanism includes a plurality of L-shaped limiting plates, and the plurality of limiting plates are all arranged on the inner wall surface of the mounting opening, and the plurality of limiting plates are arranged in a circle at equal angles, and the upper end of the limiting plate is a slope, and the limiting plate is located below the first slide groove.

[0009] As a further solution of the present invention, the adjustment mechanism includes a plurality of second slide grooves, which are all opened on the surface of the sleeve body, and the second slide grooves extend into the interior of the sleeve body and are respectively connected with the plurality of first slide grooves, and an adjustment rod is slidably connected in the second slide groove, a retractable first connecting rod is connected between the adjustment rod and the clamping block, a threaded sleeve is threadedly connected to the surface of the adjustment rod, and the threaded sleeve is rotatably connected to the upper end surface of the sleeve body.

[0010] As a further solution of the present invention, the fastening mechanism includes a plurality of arc-shaped third slide grooves, and the plurality of third slide grooves are all opened on the inner wall surface of the installation opening, the third slide groove is located below the first slide groove, the limit plate elastically slides in the third slide groove, the inner wall of the third slide groove away from the limit plate is an inclined surface, and a push block is slidably connected in the third slide groove, and the push block is located between the limit plate and the inner wall of the third slide groove, the second slide groove is connected to the third slide groove, and a retractable second connecting rod is connected between the adjusting rod and the push block.

[0011] As a further solution of the present invention, a drive ring is rotatably connected to the surface of the sleeve body, the inner side of the drive ring is in contact with the surfaces of the multiple threaded sleeves, the drive ring is used to drive the multiple threaded sleeves to rotate, and the surface of the drive ring is provided with multiple drive grooves.

[0012] As a further solution of the present invention, a plurality of triangular limit grooves are provided on the side of the drive ring, a groove is provided on the surface of the sleeve body, a limit rod is elastically slidably connected in the groove, the upper end of the limit rod extends into the limit groove, and one side of the limit rod is a slope.

[0013] As a further solution of the present invention, an annular extrusion ring is slidably connected to the bottom of the first slide groove, the extrusion ring is soft and elastic, and a retractable third connecting rod is connected between the clamping block and the extrusion ring.

[0014] As a further solution of the present invention, a guide ring is fixedly connected to the bottom of the fixing ring, and the bottom of the guide ring is an inclined surface.

[0015] Compared with the prior art, the present invention has the following beneficial effects:

[0016] 1. The present invention uses a clamping block and a first slide groove to install a casing body and a conveying pipe during oil drilling. When the clamping block moves upward in the first slide groove, it will gradually move toward the installation tube under the action of the first slide groove. Then, the clamping block will gradually move into the clamping groove along the positioning block. The positioning block is compressed, and the clamping block can stably clamp the installation tube. The position of the clamping block is adjusted by the adjusting rod to adjust the clamping tightness between the clamping block and the installation tube. The clamping block is used to clamp and fix the fixing tube, so that installation and disassembly can be performed quickly and easily without complicated operations, thereby reducing the time used for installation and disassembly.

[0017] 2. When the mounting tube is installed and fixed, the present invention rotates the driving ring, and the driving ring can simultaneously cause multiple threaded sleeves to rotate together. The rotation of the multiple threaded sleeves together can cause multiple adjustment rods and multiple clamping blocks to move together. The multiple clamping blocks move together to clamp the mounting tube at the same time, thereby ensuring the clamping effect of the multiple clamping blocks on the mounting tube, avoiding different moving positions of the multiple clamping blocks on the mounting tube, thereby causing the position of the mounting tube to shift, affecting the fixation of the mounting tube and weakening the sealing effect of the sealing strip.

[0018] 3. In the process of installing and fixing the installation tube of the present invention, the limit groove will squeeze the limit rod when the driving ring is rotated, and the limit rod will be squeezed into the groove. Then when the limit groove moves to the position of the limit rod, the limit rod will move back to the limit groove to limit the driving ring, which is beneficial for the driving ring to remain stable during the conveying operation of the conveying pipe, and avoid the vibration generated during the conveying operation of the conveying pipe that will cause the driving ring to rotate, thereby affecting the clamping and fixation of the installation tube by the clamping block. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 It is a schematic diagram of the overall structure of the present invention;

[0020] Figure 2 for Figure 1 Schematic diagram of the structure at A in the middle;

[0021] Figure 3 It is a schematic diagram of the structure of the casing body, the delivery pipe and the installation tube after being cut apart in the present invention;

[0022] Figure 4 for Figure 3 Schematic diagram of the structure at B in the middle;

[0023] Figure 5 for Figure 3 Schematic diagram of the structure at C in the middle;

[0024] Figure 6 It is a schematic diagram of the structure inside the casing body of the present invention;

[0025] Figure 7 It is a schematic diagram of the structure of the sleeve body after being cut open in the present invention;

[0026] Figure 8 It is a schematic diagram of the structure of the delivery pipe in the present invention;

[0027] Fig. 9 It is a schematic diagram of the structure of the installation cylinder in the present invention.

[0028] In the accompanying drawings, the components represented by the reference numerals are listed as follows:

[0029] 1-sleeve body, 2-installation port, 3-valve body, 4-pressure gauge, 5-delivery pipe, 6-fixing ring, 7-sealing strip, 8-installation cylinder, 9-step groove, 10-clamping groove, 11-first slide groove, 12-clamping block, 13-positioning block, 14-limiting plate, 15-second slide groove, 16-adjusting rod, 17-first connecting rod, 18-threaded sleeve, 19-third slide groove, 20-pushing block, 201-second connecting rod, 21-driving ring, 22-driving groove, 23-limiting groove, 24-groove, 25-limiting rod, 26-extrusion ring, 27-third connecting rod, 28-guide ring. DETAILED DESCRIPTION

[0030] The following describes the embodiments of the present invention by specific examples, and those skilled in the art can easily understand other advantages and effects of the present invention from the contents disclosed in this specification. The present invention can also be implemented or applied through other different specific embodiments, and the details in this specification can also be modified or changed in various ways based on different viewpoints and applications without departing from the spirit of the present invention. It should be noted that the following embodiments and features in the embodiments can be combined with each other without conflict.

[0031] It should be noted that the illustrations provided in the following embodiments are only used to illustrate the basic concept of the present invention in a schematic manner, and thus the illustrations only show components related to the present invention rather than being drawn according to the number, shape and size of components in actual implementation. In actual implementation, the type, quantity and proportion of each component may be changed arbitrarily, and the component layout may also be more complicated.

[0032] See also Figure 1-Figure 9 The present invention provides a technical solution: a super-high pressure casing head with a detachable function, comprising a casing body 1, an installation port 2 is provided inside the casing body 1, valve bodies 3 are connected to the left and right sides of the casing body 1, a pressure gauge 4 is connected to the surface of the valve body 3 on one side, a delivery pipe 5 is provided in the installation port 2, a sealing mechanism is provided on the surface of the delivery pipe 5, the sealing mechanism is used to seal between the delivery pipe 5 and the casing body 1, an installation clamping mechanism is provided on the surface of the delivery pipe 5, the installation clamping mechanism is used to keep the delivery pipe 5 fixed when the delivery pipe 5 is installed, a limiting mechanism is provided inside the casing body 1, the limiting mechanism is used to limit the end of the delivery pipe 5, an adjusting mechanism is provided on the surface of the casing body 1, the adjusting mechanism is used to adjust the clamping and tightening degree of the installation clamping mechanism, a tightening mechanism is provided at the bottom of the adjusting mechanism, and the tightening mechanism is used to support and tighten the delivery pipe 5 by the limiting mechanism during the process of the adjusting mechanism adjusting the clamping and tightening degree of the installation clamping mechanism;

[0033] The sealing mechanism includes a fixing ring 6, which is fixedly connected to the surface of the delivery pipe 5, and a ring-mounted sealing strip 7 is fixedly connected to the surface of the fixing ring 6, and the sealing strip 7 is in contact with the inner wall of the installation opening 2;

[0034] The installation clamping mechanism includes a mounting tube 8, which slides on the surface of the conveying pipe 5. The surface of the conveying pipe 5 has a stepped groove 9. The upper end of the mounting tube 8 extends inward. The surface of the mounting tube 8 is provided with an annular clamping groove 10. The mounting opening 2 is provided with an annular first slide groove 11. The inner wall of the first slide groove 11 away from the mounting tube 8 is an inclined surface. A plurality of arc-shaped clamping blocks 12 are slidably connected in the first slide groove 11. The clamping blocks 12 are located in the clamping groove 10. The plurality of clamping blocks 12 are arranged in a circle at equal angles. An elastically retractable positioning block 13 is fixedly connected to the surface of the clamping block 12. The upper and lower sides of the positioning block 13 close to one end of the conveying pipe 5 are inclined surfaces.

[0035] The limiting mechanism includes a plurality of L-shaped limiting plates 14, which are all arranged on the inner wall surface of the installation opening 2, and the plurality of limiting plates 14 are arranged in a circle at equal angles, and the upper end of the limiting plate 14 is an inclined surface, and the limiting plate 14 is located below the first slide groove 11;

[0036] The adjustment mechanism includes a plurality of second slide grooves 15, which are all provided on the surface of the casing body 1. The second slide grooves 15 extend to the inside of the casing body 1 and are respectively connected with the plurality of first slide grooves 11. An adjustment rod 16 is slidably connected in the second slide groove 15. A retractable first connecting rod 17 is connected between the adjustment rod 16 and the clamping block 12. A threaded sleeve 18 is threadedly connected on the surface of the adjustment rod 16. The threaded sleeve 18 is rotatably connected to the upper end surface of the casing body 1.

[0037] The fastening mechanism includes a plurality of arc-shaped third slide grooves 19, and the plurality of third slide grooves 19 are all provided on the inner wall surface of the installation opening 2. The third slide groove 19 is located below the first slide groove 11, and the limit plate 14 elastically slides in the third slide groove 19. The inner wall of the third slide groove 19 away from the limit plate 14 is an inclined surface, and a push block 20 is slidably connected in the third slide groove 19. The push block 20 is located between the limit plate 14 and the inner wall of the third slide groove 19, and the second slide groove 15 is connected to the third slide groove 19. A retractable second connecting rod 201 is connected between the adjusting rod 16 and the push block 20;

[0038] During the oil drilling process, it is necessary to install the casing body 1 at the drilling end, and then move the end of the delivery pipe 5 into the installation port 2, the fixing ring 6 will move into the installation port 2 together, the sealing strip 7 will fit with the inner wall of the installation port 2, and then the bottom of the delivery pipe 5 will move to the position of the limit plate 14, the inclined surface at the upper end of the limit plate 14 will guide the delivery pipe 5, and then the delivery pipe 5 moves between multiple limit plates 14, the limit plate 14 will limit the end of the delivery pipe 5, and then move the installation tube 8 into the installation port 2, the bottom of the installation tube 8 will first move to the position of the positioning block 13, the upper end of the installation tube 8 will move to the side close to the stepped groove 9, and then the installation tube 8 will squeeze the positioning block 13, the positioning block 13 will shrink and move to one side of the installation tube 8, and then in the fixed When the positioning block 13 moves to the position of the clamping groove 10, the positioning block 13 extends into the clamping groove 10, and the clamping block 12 will be at the bottom of the first slide groove 11. The bottom of the first slide groove 11 is inclined away from the mounting tube 8, and the clamping block 12 will not block the movement of the mounting tube 8. Then, the threaded sleeve 18 is rotated, and the threaded sleeve 18 acts on the adjusting rod 16 to move. The adjusting rod 16 drives the clamping block 12 to move together through the first connecting rod 17. When the clamping block 12 moves upward in the first slide groove 11, it will gradually move closer to the mounting tube 8 under the action of the first slide groove 11. Then, the clamping block 12 will gradually move into the clamping groove 10 along the positioning block 13. The positioning block 13 is compressed, and the clamping block 12 can stably clamp the mounting tube 8. The clamping block 1 2 is adjusted to adjust the clamping tightness between the clamping block 12 and the installation tube 8. The clamping installation process is relatively simple, reducing the installation time and improving the installation efficiency. When the adjusting rod 16 moves the rod, the second connecting rod 201 will drive the push block 20 to move together, and the push block 20 will move in the third slide groove 19. The push block 20 will gradually move to the side close to the limit plate 14 under the action of the inner wall slope of the third slide groove 19. The multiple limit plates 14 will squeeze and fix the delivery pipe 5, so that the delivery pipe 5 can be in the middle position of the installation port 2 during the installation process, ensuring the installation of the delivery pipe 5. Subsequently, after the delivery pipe 5 is installed and working, the drilling fluid will be transported in the delivery pipe 5, and the pressure in the delivery pipe 5 will increase. The delivery pipe 5 and the installation tube 8 will tend to move toward the outside of the installation port 2 under the action of the drilling fluid pressure. When the delivery pipe 5 and the installation tube 8 are displaced during long-term work, the movement of the delivery pipe 5 will drive the installation tube 8 to move together through the step groove 9, and the installation tube 8 will drive the clamping block 12 to move upward. The clamping block 12 will increase the clamping force of the installation tube 8 under the action of the first slide groove 11, thereby ensuring the clamping of the installation tube 8 by the clamping block 12. Subsequently, when the drilling work is completed and it needs to be dismantled, the adjusting rod 16 is moved downward through the threaded sleeve 18, and the clamping block 12 and the pushing block 20 will move together. The clamping block 12 and the pushing block 20 will move to the side away from the installation tube 8 under the action of the first slide groove 11 and the third slide groove 19 respectively.The clamping block 12 is moved out of the clamping groove 10, and then the installation tube 8 and the delivery tube 5 can be quickly moved out of the installation port 2. The fixing tube is clamped and fixed by the clamping block 12, which can be installed and disassembled quickly and easily without complicated operations, thus reducing the time used for installation and disassembly.

[0039] When installing and fixing the installation tube 8, the multiple threaded sleeves 18 need to be rotated separately and cannot be rotated at the same time. As a further solution of the present invention, a driving ring 21 is rotatably connected to the surface of the sleeve body 1, and the inner side of the driving ring 21 is in contact with the surfaces of the multiple threaded sleeves 18. The driving ring 21 is used to drive the multiple threaded sleeves 18 to rotate, and a plurality of driving grooves 22 are provided on the surface of the driving ring 21;

[0040] When installing and fixing the mounting tube 8, the driving ring 21 is rotated. The driving ring 21 can simultaneously cause multiple threaded sleeves 18 to rotate together. The rotation of multiple threaded sleeves 18 together can cause multiple adjusting rods 16 and multiple clamping blocks 12 to move together. The movement of multiple clamping blocks 12 together can clamp the mounting tube 8 at the same time, thereby ensuring the clamping effect of multiple clamping blocks 12 on the mounting tube 8, and avoiding different moving positions of multiple clamping blocks 12 for different clamping positions of the mounting tube 8, thereby causing the position of the mounting tube 8 to shift, affecting the fixation of the mounting tube 8 and weakening the sealing effect of the sealing strip 7. The driving groove 22 is used to rotate the driving ring 21 through the driving groove 22 when it is necessary to further rotate the driving ring 21 after the clamping block 12 clamps the mounting tube 8 to improve the tightness of the clamping block 12 to the mounting tube 8.

[0041] During the conveying operation of the conveying pipe 5, the conveying pipe 5 and the mounting tube 8 are prone to shaking, which can easily cause the driving ring 21 to move. As a further solution of the present invention, a plurality of triangular limiting grooves 23 are provided on the side of the driving ring 21, and a groove 24 is provided on the surface of the sleeve body 1. A limiting rod 25 is elastically slidably connected in the groove 24. The upper end of the limiting rod 25 extends into the limiting groove 23, and one side of the limiting rod 25 is an inclined surface.

[0042] During the process of installing and fixing the mounting tube 8, the limiting groove 23 will squeeze the limiting rod 25 when the driving ring 21 is rotated, and the limiting rod 25 will be squeezed into the groove 24. Then, when the limiting groove 23 moves to the position of the limiting rod 25, the limiting rod 25 will move back to the limiting groove 23 to limit the driving ring 21, which is beneficial for the driving ring 21 to remain stable during the conveying operation of the conveying pipe 5, and avoid the vibration generated during the conveying operation of the conveying pipe 5 that will cause the driving ring 21 to rotate, thereby affecting the clamping and fixing of the mounting tube 8 by the clamping block 12. Then, when the mounting tube 8 needs to be disassembled, the limiting rod 25 is pressed into the groove 24, and the driving ring 21 can rotate in the opposite direction.

[0043] During the conveying operation of the conveying pipe 5, the conveying pipe 5 will drive the sealing strip 7 to move after working for a long time. As a further solution of the present invention, an annular extrusion ring 26 is slidably connected to the bottom of the first slide groove 11. The extrusion ring 26 is soft and elastic. A retractable third connecting rod 27 is connected between the clamping block 12 and the extrusion ring 26.

[0044] During the process of installing and fixing the installation tube 8, when the clamping block 12 moves toward the side close to the installation tube 8, it will drive the third connecting rod 27 and the extrusion ring 26 to move together, and the extrusion ring 26 will shrink and move to the top of the fixing ring 6 to block the fixing ring 6, so as to prevent the fixing ring 6 from moving upward too much and affecting the sealing effect of the sealing strip 7, and the fixing ring 6 can squeeze the extrusion ring 26 to block and seal the edge of the fixing ring 6, thereby enhancing the sealing performance of the fixing ring 6.

[0045] When the delivery pipe 5 moves into the installation opening 2, the fixing ring 6 is easily blocked. As a further solution of the present invention, a guide ring 28 is fixedly connected to the bottom of the fixing ring 6, and the bottom of the guide ring 28 is an inclined surface;

[0046] When the delivery pipe 5 moves into the installation opening 2 , the guide ring 28 can guide the delivery pipe 5 so that the delivery pipe 5 and the fixing ring 6 can move into the installation opening 2 , thereby preventing the bottom of the fixing ring 6 from being blocked by the edge of the installation opening 2 and affecting the installation of the delivery pipe 5 .

[0047] The above embodiments are merely illustrative of the principles and effects of the present invention, and are not intended to limit the present invention. Anyone familiar with the art may modify or alter the above embodiments without departing from the spirit and scope of the present invention. Therefore, all equivalent modifications or alterations made by a person of ordinary skill in the art without departing from the spirit and technical concept disclosed by the present invention shall still be covered by the claims of the present invention.

Claims

1. An ultra-high voltage casing head with a detachable function, comprising a casing body (1), characterized in that: The sleeve body (1) is provided with an installation opening (2) inside. The left and right sides of the sleeve body (1) are both connected to valve bodies (3). The surface of the valve body (3) on one side is connected to a pressure gauge (4). A delivery pipe (5) is provided inside the installation opening (2). A sealing mechanism is provided on the surface of the delivery pipe (5). The sealing mechanism is used to seal between the delivery pipe (5) and the sleeve body (1). An installation clamping mechanism is provided on the surface of the delivery pipe (5). The installation clamping mechanism is used to keep the delivery pipe (5) fixed when the delivery pipe (5) is installed. A limiting mechanism is provided inside the sleeve body (1). The limiting mechanism is used to limit the end of the delivery pipe (5). An adjustment mechanism is provided on the surface of the sleeve body (1). The adjustment mechanism is used to adjust the clamping tightness of the installation clamping mechanism. A tightening mechanism is provided at the bottom of the adjustment mechanism. The tightening mechanism is used to support and tighten the delivery pipe (5) by using the limiting mechanism during the process of the adjustment mechanism adjusting the clamping tightness of the installation clamping mechanism.

2. The ultra-high voltage casing head with detachable function according to claim 1, characterized in that: The sealing mechanism comprises a fixing ring (6), the fixing ring (6) being fixedly connected to the surface of the conveying pipe (5), a ring-mounted sealing strip (7) being fixedly connected to the surface of the fixing ring (6), and the sealing strip (7) being in contact with the inner wall of the installation opening (2).

3. The ultra-high voltage casing head with detachable function according to claim 2, characterized in that: The installation clamping mechanism comprises an installation tube (8), the installation tube (8) slides on the surface of the conveying tube (5), the surface of the conveying tube (5) is provided with a stepped groove (9), the upper end of the installation tube (8) extends inward, the surface of the installation tube (8) is provided with an annular clamping groove (10), the installation opening (2) is provided with an annular first slide groove (11), the inner wall of the first slide groove (11) away from the installation tube (8) is an inclined surface, a plurality of arc-shaped clamping blocks (12) are slidably connected in the first slide groove (11), the clamping blocks (12) are located in the clamping groove (10), the plurality of clamping blocks (12) are arranged in a circle at equal angles, the surface of the clamping block (12) is fixedly connected with an elastically retractable positioning block (13), the upper and lower sides of the positioning block (13) close to one end of the conveying tube (5) are both inclined surfaces.

4. The ultra-high voltage casing head with detachable function according to claim 3, characterized in that: The limiting mechanism comprises a plurality of L-shaped limiting plates (14), the plurality of limiting plates (14) are all arranged on the inner wall surface of the installation opening (2), the plurality of limiting plates (14) are arranged in a circle at equal angles, the upper end of the limiting plate (14) is an inclined surface, and the limiting plate (14) is located below the first slide groove (11).

5. The ultra-high voltage casing head with detachable function according to claim 4, characterized in that: The adjustment mechanism comprises a plurality of second slide grooves (15), wherein the plurality of second slide grooves (15) are all arranged on the surface of the sleeve body (1), the second slide grooves (15) extend to the inside of the sleeve body (1) and are respectively connected with the plurality of first slide grooves (11), an adjustment rod (16) is slidably connected in the second slide groove (15), a retractable first connecting rod (17) is connected between the adjustment rod (16) and the clamping block (12), a threaded sleeve (18) is threadedly connected to the surface of the adjustment rod (16), and the threaded sleeve (18) is rotatably connected to the upper end surface of the sleeve body (1).

6. The ultra-high voltage casing head with detachable function according to claim 5, characterized in that: The fastening mechanism comprises a plurality of arc-shaped third slide grooves (19), wherein the plurality of third slide grooves (19) are all arranged on the inner wall surface of the installation opening (2), the third slide groove (19) is located below the first slide groove (11), the limit plate (14) elastically slides in the third slide groove (19), the inner wall of the third slide groove (19) away from the limit plate (14) is an inclined surface, a push block (20) is slidably connected in the third slide groove (19), the push block (20) is located between the limit plate (14) and the inner wall of the third slide groove (19), the second slide groove (15) is connected to the third slide groove (19), and a retractable second connecting rod (201) is connected between the adjusting rod (16) and the push block (20).

7. The ultra-high voltage casing head with detachable function according to claim 5, characterized in that: A driving ring (21) is rotatably connected to the surface of the sleeve body (1); the inner side of the driving ring (21) is in contact with the surfaces of the plurality of threaded sleeves (18); the driving ring (21) is used to drive the plurality of threaded sleeves (18) to rotate; and a plurality of driving grooves (22) are provided on the surface of the driving ring (21).

8. The ultra-high voltage casing head with detachable function according to claim 7, characterized in that: The side surface of the driving ring (21) is provided with a plurality of triangular limiting grooves (23), the surface of the sleeve body (1) is provided with a groove (24), a limiting rod (25) is elastically slidably connected in the groove (24), the upper end of the limiting rod (25) extends into the limiting groove (23), and one side of the limiting rod (25) is an inclined surface.

9. The ultra-high voltage casing head with detachable function according to claim 3, characterized in that: An annular extrusion ring (26) is slidably connected to the bottom of the first slide groove (11); the extrusion ring (26) is soft and elastic; a retractable third connecting rod (27) is connected between the clamping block (12) and the extrusion ring (26).

10. The ultra-high voltage casing head with detachable function according to claim 2, characterized in that: The bottom of the fixing ring (6) is fixedly connected to a guide ring (28), and the bottom of the guide ring (28) is an inclined surface.

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