Telescopic casing head with leak-proof function

Abstract

The telescopic casing head with the leakproof function comprises a casing head body, the casing head body comprises an inner cylinder, a positioning connecting pipe and a movable outer cylinder, a first threaded sleeve seat is welded to the bottom of the lower end of the inner cylinder, and meanwhile first sealing ring sleeves are arranged on the outer sides of the upper end and the lower end of the first threaded sleeve seat; and the outer side of the upper end of the inner cylinder is slidably connected with a movable outer cylinder, and an elastic inflation sleeve is connected to the outer side of the inner cylinder and located between the first sealing ring sleeves arranged at the lower end and the upper end of the movable outer cylinder in a sleeving mode. According to the telescopic casing head with the anti-leakage function, the inner cylinder, the positioning connecting pipe and the movable outer cylinder are arranged to be used in cooperation, so that the casing head body is of a combined structure, the movable outer cylinder moves upwards on the outer side of the inner cylinder by moving the movable outer cylinder, and the overall length of the casing head body is increased; therefore, the use requirements under different conditions are met, and the use practicability is improved.

Description

Technical Field

[0001] The present invention relates to the technical field of casing heads, and specifically provides a casing head that is telescopic and has a leakage prevention function. Background Art

[0002] A casing head is used to fix the wellhead of a drilling well, connect the wellhead casing string, support the gravity of the technical casing and the production casing, seal the annular space between each layer of pipes, provide a transition connection for installing a blowout preventer, a tubing head, and a Christmas tree, and through two side ports on the casing head body, construction operations such as mud squeezing, monitoring, and filling of balancing fluid can be carried out.

[0003] After retrieval, it is found that a typical casing head in the prior art is, for example, the one with the publication number CN221896558U, a casing head that is convenient for connection, including: a casing head body, a flange is fixedly installed at the upper end of the casing head body, a connection ring is fixedly installed inside the upper end of the casing head body, a threaded cylinder is fixedly installed inside the lower end of the casing head body, and a number of limiting rods are evenly and elastically connected to the side wall of the casing head body. The limiting rods are located below the threaded cylinder. By inserting a connecting pipe into the threaded cylinder and threadedly connecting it to the inner wall of the threaded cylinder until the upper end of the connecting pipe contacts the lower end of the connection ring, and at the same time, the upper end of the sealing ring is located in the first groove to seal the connection between the connecting pipe and the connection ring. Then, the threaded cap is screwed, and when the threaded cap moves downward, the limiting rods can be pushed inward, and the inner ends of the limiting rods can be inserted into the limiting grooves through the tension springs to fix the connecting pipe and prevent the connecting pipe from loosening during use.

[0004] In summary, when the existing casing heads are in use, they generally have a fixed-size structure and cannot be telescopically adjusted, reducing the practicality of use. And during installation and fixation, the sealing means are relatively single and cannot perform dynamic sealing. After long-term use, the sealing parts are prone to aging. If not replaced in time, it is easy to cause a decline in sealing performance and even lose the sealing effect. In view of the above problems, it is necessary to improve the existing equipment. Summary of the Invention

[0005] The purpose of the present invention is to provide a casing head that is telescopic and has a leakage prevention function, so as to solve the problems in the above background art that when the existing casing heads are in use, they generally have a fixed-size structure and cannot be telescopically adjusted, reducing the practicality of use. And during installation and fixation, the sealing means are relatively single and cannot perform dynamic sealing. After long-term use, the sealing parts are prone to aging. If not replaced in time, it is easy to cause a decline in sealing performance and even lose the sealing effect.

[0006] To achieve the above purpose, the present invention provides the following technical solution: a casing head that is telescopic and has a leakage prevention function, including a casing head body,

[0007] The casing head body includes an inner cylinder, a positioning connecting pipe, and a movable outer cylinder. A first threaded socket is welded to the bottom of the lower end of the inner cylinder. At the same time, first sealing ring sleeves are arranged on the outer sides of the upper end and the lower end of the first threaded socket. The lower end of the first threaded socket is threadedly connected to the inner side of the upper end of the positioning connecting pipe. A first positioning flange is welded to the outer side of the positioning connecting pipe. At the same time, a side pipe is arranged at the rear side of the upper end of the positioning connecting pipe. The movable outer cylinder is slidably connected to the outer side of the upper end of the inner cylinder. An elastic inflatable sleeve is sleeved between the first sealing ring sleeves arranged at the lower end and the upper end of the movable outer cylinder on the outer side of the inner cylinder. At the same time, a second positioning flange is arranged on the outer side of the movable outer cylinder;

[0008] A protection mechanism is arranged on the outer side of the casing head body. The protection mechanism includes a protective sleeve, a first connection component, a second connection component, a first sleeve frame, and a second sleeve frame, which are used to protect the outer side of the casing head body and extend the service life of the casing head body.

[0009] Preferably, a second threaded socket is slidably connected to the outer side of the upper end of the inner cylinder. The outer side of the lower end of the second threaded socket is threadedly connected to the inner side of the upper end of the movable outer cylinder. At the same time, a sliding seat is arranged on the outer side of the upper end of the inner cylinder below the second threaded socket. The outer side of the sliding seat is slidably connected to the symmetrically arranged sliding grooves on the inner side of the upper end of the movable outer cylinder. A sealing filler is filled between the upper end of the sliding seat and the lower end of the second threaded socket. At the same time, the lower ends of the two sliding grooves are fixedly connected to a limiting seat on the outer side of the inner cylinder.

[0010] Preferably, the first sealing ring sleeve arranged at the upper end is located between the upper end of the first threaded socket and the lower end of the movable outer cylinder, and the first sealing ring sleeve arranged at the lower end is located between the lower end of the first threaded socket and the upper end of the positioning connecting pipe.

[0011] Preferably, an air charging pipe is arranged on one side of the elastic inflatable sleeve. The air charging pipe penetrates through the lower end of the protective sleeve and is connected to an air charging pump. At the same time, the air charging pump is installed on the front surface of the first sleeve frame.

[0012] Preferably, grooves are symmetrically opened in the inner side of the lower end of the movable outer cylinder. A guiding sliding rod is arranged in the middle of the two grooves. At the same time, the two guiding sliding rods are slidably connected to the corresponding sliding blocks arranged on the outer side of the inner cylinder. The bottoms of the two guiding sliding rods are connected to the upper end of a sealing cover. The sealing cover is connected to the bottom of the lower end of the movable outer cylinder through mounting screws.

[0013] Preferably, conveying pipes are symmetrically arranged on the outer side of the front surface of the movable outer cylinder at the position of the sealing filler. A pumping and sending pump is arranged on each of the two conveying pipes. At the same time, the lower ends of the two conveying pipes are connected to a storage box arranged on the front surface of the second sleeve frame.

[0014] Preferably, the protective sleeve is a rubber corrugated pipe, and the lower end of the protective sleeve is connected to the first positioning flange through the first connection assembly. At the same time, the upper end of the protective sleeve is connected to the second positioning flange through the second connection assembly. A first sleeve frame is arranged outside the lower end of the protective sleeve and the first connection assembly, and a second sleeve frame is arranged outside the upper end of the protective sleeve and the second connection assembly. At the same time, the tops of the threaded vertical rods symmetrically arranged at the upper end of the first sleeve frame penetrate through the second sleeve frame and extend above the second sleeve frame. Positioning nuts are threadedly connected to the outside of the bottom of the second sleeve frame for both of the threaded vertical rods. Side plates are symmetrically arranged on both sides of the first sleeve frame, and ground nails are arranged on both of the side plates.

[0015] Preferably, the first connection assembly includes a positioning sleeve, a first gasket and a second gasket. The positioning sleeve is of an I-shaped structure and is arranged outside the upper end of the positioning connecting pipe. A first gasket is arranged between the lower end of the positioning sleeve and the upper end of the first positioning flange. The outside of the lower end of the positioning sleeve is threadedly connected to the first positioning flange through the first fixing bolts arranged at equal intervals and penetrating through the first gasket. At the same time, a second gasket is arranged between the upper end of the positioning sleeve and the bottom of the lower end of the protective sleeve. The outside of the lower end of the protective sleeve is threadedly connected to the upper end of the positioning connecting pipe through the second fixing bolts arranged at equal intervals and penetrating through the second gasket.

[0016] Preferably, the second connection assembly includes a first sealing block. The first sealing block is of a T-shaped structure and is made of rubber. The outside of the lower end of the first sealing block is threadedly connected to the inner side of the upper end of the protective sleeve. The top of the first sealing block is in contact with the lower end of the second positioning flange. At the same time, the third bolts arranged at equal intervals at the upper end of the second positioning flange penetrate through the first sealing block and are threadedly connected to the upper end of the protective sleeve.

[0017] Compared with the prior art, the beneficial effects of the present invention are as follows: The casing head with a retractable and leak-proof function

[0018] (1) In order to solve the problem that the existing casing heads are generally of a fixed-size structure and cannot be adjusted in a telescopic manner, reducing the practicality of use. In this application, by setting the inner cylinder, the positioning connecting pipe and the movable outer cylinder to be used in combination, the casing head body is of a combined structure. And by moving the movable outer cylinder, the movable outer cylinder moves upward outside the inner cylinder, extending the overall length of the casing head body, so as to meet the use requirements in different situations and improve the practicality of use;

[0019] (2) To solve the problem that in the existing casing head, when it is installed and fixed, the sealing means is relatively single, dynamic sealing cannot be carried out, the sealing parts are prone to aging after long-term use, and if not replaced in time, it is easy to cause a decline in sealing performance and even loss of sealing effect. In this application, by setting up an elastic inflatable sleeve, an inflation pipe, an air pump, as well as a sealing filler, a conveying pipe, a pumping and sending pump, and a storage box for combined use, it is convenient to protect and seal the positions of the casing head body that are prone to leakage. At the same time, the sealing area is adjusted according to the usage situation, so as to make the sealing effect at the connection in the casing head body higher. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 It is a front view sectional structure schematic diagram of the present invention;

[0021] Figure 2 It is a front view structure schematic diagram of the casing head body of the present invention;

[0022] Figure 3 It is a front view sectional structure schematic diagram of the casing head body of the present invention;

[0023] Figure 4 For the present invention Figure 3 The enlarged structure schematic diagram at position A in it;

[0024] Figure 5 For the present invention Figure 3 The enlarged structure schematic diagram at position B in it;

[0025] Figure 6 It is a front view structure schematic diagram of the present invention;

[0026] Figure 7 It is a rear view structure schematic diagram of the present invention.

[0027] In the figure: 1. Casing head body; 101. Inner cylinder; 1011. Slide block; 1012. Slide seat; 102. First threaded socket; 103. First sealing ring sleeve; 104. Positioning connecting pipe; 1041. Side pipe; 105. First positioning flange; 106. Elastic inflatable sleeve; 1061. Inflation pipe; 1062. Air pump; 107. Moving outer cylinder; 1071. Guide slide bar; 1072. Sealing cover; 1073. Chute; 1074. Limit seat; 108. Second positioning flange; 109. Second threaded socket; 110. Sealing filler; 111. Conveying pipe; 112. Pumping and sending pump; 113. Storage box; 2. Positioning sleeve; 3. First sealing gasket; 4. Second sealing gasket; 5. Protective sleeve; 6. First sealing block; 7. First set frame; 8. Side plate; 9. Ground anchor; 10. Second set frame; 11. Threaded vertical rod; 12. Lock nut. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0028] Next, the technical solutions in the embodiments of the present invention will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present invention without creative efforts shall fall within the protection scope of the present invention.

[0029] Please refer to Figure 1-7 , the present invention provides a technical solution: a casing head that is retractable and has a leak-proof function. According to Figure 1 , Figure 2 , Figure 3 , Figure 4 and Figure 5 shown, the casing head body 1 includes an inner cylinder 101, a positioning connection pipe 104, and a movable outer cylinder 107. A first threaded socket 102 is welded to the bottom of the lower end of the inner cylinder 101. At the same time, first sealing ring sleeves 103 are provided on the outer sides of the upper and lower ends of the first threaded socket 102. The first sealing ring sleeve 103 provided at the upper end is located between the upper end of the first threaded socket 102 and the lower end of the movable outer cylinder 107, and the first sealing ring sleeve 103 provided at the lower end is located between the lower end of the first threaded socket 102 and the upper end of the positioning connection pipe 104. By providing the first sealing ring sleeve 103, it is convenient to improve the sealing performance between the first threaded socket 102, the positioning connection pipe 104, and the elastic inflatable sleeve 106. The lower end of the first threaded socket 102 is in threaded connection with the inner side of the upper end of the positioning connection pipe 104, and a first positioning flange 105 is welded to the outer side of the positioning connection pipe 104. At the same time, a side pipe 1041 is provided at the rear side of the upper end of the positioning connection pipe 104. By providing the side pipe 1041, construction operations such as supplementary mud squeezing, monitoring, and filling of balance liquid can be carried out. The movable outer cylinder 107 is slidably connected to the outer side of the upper end of the inner cylinder 101, and an elastic inflatable sleeve 106 is sleeved between the lower end of the movable outer cylinder 107 and the first sealing ring sleeve 103 provided at the upper end on the outer side of the inner cylinder 101. An air charging pipe 1061 is provided on one side of the elastic inflatable sleeve 106, and the air charging pipe 1061 penetrates through the lower end of the protective sleeve 5 and is connected to an air charging pump 1062. At the same time, the air charging pump 1062 is installed on the front surface of the first sleeve frame 7. The air charging pump 1062 inflates and deflates the elastic inflatable sleeve 106 through the air charging pipe 1061, so that the elastic inflatable sleeve 106 can be adjusted according to the distance between the lower end of the movable outer cylinder 107 and the first sealing ring sleeve 103, thereby improving the flexibility and sealing performance of use. At the same time, a second positioning flange 108 is provided on the outer side of the movable outer cylinder 107.

[0030] Further explanation: A second threaded socket 109 is slidably connected to the outer side of the upper end of the inner cylinder 101, and the outer side of the lower end of the second threaded socket 109 is threadedly connected to the inner side of the upper end of the movable outer cylinder 107. Through the second threaded socket 109, it is convenient to seal and guide the connection between the upper end of the movable outer cylinder 107 and the inner cylinder 101, preventing the movable outer cylinder 107 from shifting when moving. At the same time, a sliding seat 1012 is arranged on the outer side of the upper end of the inner cylinder 101 below the second threaded socket 109, and the outer side of the sliding seat 1012 is slidably connected to symmetrically arranged sliding grooves 1073 on the inner side of the upper end of the movable outer cylinder 107. By moving the sliding seat 1012 inside the sliding grooves 1073, the movable outer cylinder 107 is not easily offset when moving, improving the smoothness of movement. And a sealing filler 110 is filled between the upper end of the sliding seat 1012 and the lower end of the second threaded socket 109. On the front side of the movable outer cylinder 107, conveying pipes 111 are symmetrically arranged on the outer side of the position of the sealing filler 110, and pumping pumps 112 are arranged on both of the two conveying pipes 111. At the same time, the lower ends of the two conveying pipes 111 are connected to a storage box 113 arranged on the front side of the second sleeve frame 10. Through one of the pumping pumps 112, it is convenient to convey the sealing filler 110 stored inside the storage box 113 through the corresponding conveying pipe 111 to the cavity between the upper end of the sliding seat 1012 and the lower end of the second threaded socket 109, facilitating the filling and sealing of the device and improving the sealing performance during use. At the same time, through the other pumping pump 112, it is convenient to convey the sealing filler 110 filled in the cavity between the conveying pipe 111 to the upper end of the sliding seat 1012 and the lower end of the second threaded socket 109 through the corresponding conveying pipe 111 to the inside of the storage box 113 for storage, so that the thickness of the sealing filler 110 can be adjusted according to the usage situation, improving the flexibility, practicality and sealing performance of use. At the same time, the lower ends of the two sliding grooves 1073 are fixedly connected with a limit seat 1074 on the outer side of the inner cylinder 101.

[0031] Further explanation: Grooves are symmetrically arranged on the inner side of the lower end of the movable outer cylinder 107, and a guiding slide bar 1071 is arranged in the middle of the two grooves. At the same time, the two guiding slide bars 1071 are slidably connected to corresponding sliders 1011 on the outer side of the inner cylinder 101. The bottoms of the two guiding slide bars 1071 are connected to the upper end of a sealing cover 1072, and the sealing cover 1072 is connected to the bottom of the lower end of the movable outer cylinder 107 through mounting screws. By moving the slider 1011 on the guiding slide bar 1071, the extension and contraction movement between the inner cylinder 101 and the movable outer cylinder 107 is relatively smooth.

[0032] According to Figure 1 、 Figure 6 and Figure 7 As shown in, a protective mechanism is arranged on the outer side of the casing head body 1, and the protective mechanism includes a protective sleeve 5, a first connection component, a second connection component, a first sleeve frame 7 and a second sleeve frame 10, which are used to protect the outer side of the casing head body 1 and extend the service life of the casing head body 1.

[0033] Further explanation, the protective sleeve 5 is a rubber bellows, and the lower end of the protective sleeve 5 is connected to the first positioning flange 105 through the first connection assembly. The first connection assembly includes a positioning sleeve 2, a first gasket 3 and a second gasket 4. The positioning sleeve 2 is of an I-shaped structure. At the same time, the positioning sleeve 2 is arranged outside the upper end of the positioning connecting pipe 104. A first gasket 3 is arranged between the lower end of the positioning sleeve 2 and the upper end of the first positioning flange 105. And the outer side of the lower end of the positioning sleeve 2 is threadedly connected to the first positioning flange 105 through the first fixing bolts arranged at equal intervals and penetrating through the first gasket 3. At the same time, a second gasket 4 is arranged between the upper end of the positioning sleeve 2 and the bottom of the lower end of the protective sleeve 5. The outer side of the lower end of the protective sleeve 5 is threadedly connected to the upper end of the positioning connecting pipe 104 through the second fixing bolts arranged at equal intervals and penetrating through the second gasket 4. At the same time, the upper end of the protective sleeve 5 is connected to the second positioning flange 108 through the second connection assembly. The second connection assembly includes a first sealing block 6. The first sealing block 6 is of a T-shaped structure. At the same time, the first sealing block 6 is made of rubber. The outer side of the lower end of the first sealing block 6 is threadedly connected to the inner side of the upper end of the protective sleeve 5. And the top of the first sealing block 6 is in contact with the lower end of the second positioning flange 108. At the same time, the third bolts arranged at equal intervals at the upper end of the second positioning flange 108 penetrate through the first sealing block 6 and are threadedly connected to the upper end of the protective sleeve 5. A first sleeve frame 7 is arranged outside the lower end of the protective sleeve 5 and the first connection assembly. And a second sleeve frame 10 is arranged outside the upper end of the protective sleeve 5 and the second connection assembly. At the same time, the tops of the threaded vertical rods 11 symmetrically arranged at the upper end of the first sleeve frame 7 penetrate through the second sleeve frame 10 and extend above the second sleeve frame 10. Positioning nuts 12 are threadedly connected to the outer sides of the bottoms of the two threaded vertical rods 11 located at the second sleeve frame 10. By moving the second sleeve frame 10, the second sleeve frame 10 is moved on the threaded vertical rods 11 to stretch or fold the protective sleeve 5. Then, according to the position of the second sleeve frame 10 after adjustment, the positioning nut 12 is rotated so that the positioning nut 12 is in contact with the lower end of the second sleeve frame 10, which is convenient for limiting the height of the position where the second sleeve frame 10 is placed, improving the practicality of use and simultaneously protecting the casing head body 1. Side plates 8 are symmetrically arranged on both sides of the first sleeve frame 7. And ground nails 9 are arranged on both of the two side plates 8. Through the ground nails 9, it is convenient to position the protection mechanism and improve the stability of use.

[0034] The orientation or positional relationship indicated by the terms "center", "longitudinal", "transverse", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc. is the orientation or positional relationship based on the orientation or positional relationship shown in the drawings. It is only a simplified description for facilitating the description of the present invention, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus cannot be construed as a limitation on the protected content of the present invention.

[0035] Although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions described in the foregoing embodiments, or perform equivalent replacements for some of the technical features. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principle of the present invention shall be included within the protection scope of the present invention.

Claims

1. A telescopic and leak-proof casing head, comprising a casing head body (1), characterized in that: The casing head body (1) comprises an inner tube (101), a positioning connecting tube (104) and a movable outer tube (107), and a first threaded sleeve (102) is welded to the bottom of the lower end of the inner tube (101), and a first sealing ring sleeve (103) is arranged on the outer side of the upper end and the lower end of the first threaded sleeve (102), the lower end of the first threaded sleeve (102) is threadedly connected to the inner side of the upper end of the positioning connecting tube (104), and the outer side of the positioning connecting tube (104) is welded to the inner side of the upper end of the positioning connecting tube (104). A first positioning flange (105) is connected, and a side tube (1041) is arranged at the rear side of the upper end of the positioning connection tube (104); a movable outer tube (107) is slidably connected to the outer side of the upper end of the inner tube (101); and an elastic inflatable sleeve (106) is sleeved between the first sealing ring sleeve (103) arranged at the lower end and the upper end of the movable outer tube (107) on the outer side of the inner tube (101); and a second positioning flange (108) is arranged on the outer side of the movable outer tube (107); A protective mechanism is arranged on the outside of the casing head body (1), and the protective mechanism comprises a protective sleeve (5), a first connecting component, a second connecting component, a first sleeve frame (7) and a second sleeve frame (10), and is used to protect the outside of the casing head body (1) and extend the service life of the casing head body (1).

2. The telescopic and leak-proof cannula head according to claim 1, characterized in that: The outer side of the upper end of the inner cylinder (101) is slidably connected with a second threaded sleeve (109), and the outer side of the lower end of the second threaded sleeve (109) is threadedly connected with the inner side of the upper end of the movable outer cylinder (107). At the same time, a sliding seat (1012) is arranged on the outer side of the upper end of the inner cylinder (101) below the second threaded sleeve (109). The outer side of the sliding seat (1012) is symmetrically provided with sliding grooves (1073) on the inner side of the upper end of the movable outer cylinder (107) for sliding connection, and a sealing filler (110) is filled between the upper end of the sliding seat (1012) and the lower end of the second threaded sleeve (109). At the same time, the lower ends of the two sliding grooves (1073) are located on the outer side of the inner cylinder (101) and fixedly connected with a limiting seat (1074).

3. The telescopic and leak-proof casing head according to claim 1, characterized in that: The first sealing ring sleeve (103) arranged at the upper end is located between the upper end of the first threaded sleeve (102) and the lower end of the movable outer cylinder (107), and the first sealing ring sleeve (103) arranged at the lower end is located between the lower end of the first threaded sleeve (102) and the upper end of the positioning connecting pipe (104).

4. The telescopic and leak-proof cannula head according to claim 1, characterized in that: An inflation tube (1061) is provided on one side of the elastic inflation sleeve (106), and the inflation tube (1061) passes through the lower end of the protective sleeve (5) and is connected to an inflation pump (1062), while the inflation pump (1062) is installed on the front side of the first sleeve frame (7).

5. The telescopic and leak-proof casing head according to claim 1, characterized in that: The inner side of the lower end of the movable outer cylinder (107) is symmetrically provided with grooves, and a guide slide bar (1071) is arranged in the middle of the two grooves. The two guide slide bars (1071) are slidably connected with a slider (1011) correspondingly arranged on the outer side of the inner cylinder (101). The bottom of the two guide slide bars (1071) is connected to the upper end of the sealing cover (1072), and the sealing cover (1072) is connected to the bottom of the lower end of the movable outer cylinder (107) by means of mounting screws.

6. The telescopic and leak-proof casing head according to claim 1, characterized in that: The front of the movable outer cylinder (107) is symmetrically provided with delivery pipes (111) outside the position of the sealing filler (110), and the two delivery pipes (111) are both provided with a pumping pump (112). At the same time, the lower ends of the two delivery pipes (111) are connected to a material storage box (113) provided on the front of the second frame (10).

7. The telescopic and leak-proof cannula head according to claim 1, characterized in that: The protective sleeve (5) is a rubber bellows, and the lower end of the protective sleeve (5) is connected to the first positioning flange (105) through a first connecting assembly, and the upper end of the protective sleeve (5) is connected to the second positioning flange (108) through a second connecting assembly. A first sleeve frame (7) is arranged between the lower end of the protective sleeve (5) and the outer side of the first connecting assembly, and a second sleeve frame (10) is arranged between the upper end of the protective sleeve (5) and the outer side of the second connecting assembly. At the same time, the top of the threaded vertical rod (11) symmetrically arranged at the upper end of the first sleeve frame (7) passes through the second sleeve frame (10) and extends to the top of the second sleeve frame (10). The two threaded vertical rods (11) are located on the outer side of the bottom of the second sleeve frame (10) and are both threadedly connected with positioning nuts (12). Side panels (8) are symmetrically arranged on both sides of the first sleeve frame (7), and ground nails (9) are arranged on both side panels (8).

8. The telescopic and leak-proof cannula head according to claim 1, characterized in that: The first connection assembly comprises a positioning sleeve (2), a first sealing gasket (3) and a second sealing gasket (4), and the positioning sleeve (2) is an I-shaped structure. The positioning sleeve (2) is arranged on the outer side of the upper end of the positioning connection pipe (104), and a first sealing gasket (3) is arranged between the lower end of the positioning sleeve (2) and the upper end of the first positioning flange (105). The outer side of the lower end of the positioning sleeve (2) is threadedly connected to the first positioning flange (105) by penetrating the first sealing gasket (3) through equidistantly arranged first fixing bolts, and the second sealing gasket (4) is arranged between the upper end of the positioning sleeve (2) and the bottom of the lower end of the protective sleeve (5). The outer side of the lower end of the protective sleeve (5) is threadedly connected to the upper end of the positioning connection pipe (104) through penetrating the second sealing gasket (4) through equidistantly arranged second fixing bolts.

9. The telescopic and leak-proof cannula head according to claim 1, characterized in that: The second connection assembly comprises a first sealing block (6), and the first sealing block (6) is a T-shaped structure. The first sealing block (6) is made of rubber material. The outer side of the lower end of the first sealing block (6) is threadedly connected to the inner side of the upper end of the protective sleeve (5), and the top of the first sealing block (6) is in contact with the lower end of the second positioning flange (108). At the same time, third bolts equidistantly arranged at the upper end of the second positioning flange (108) penetrate the first sealing block (6) and are threadedly connected to the upper end of the protective sleeve (5).

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