A fully metal structure wellhead secondary sealing device

Abstract

The present invention discloses a fully metal structured wellhead secondary sealing device, which belongs to the technical field of sealing equipment and comprises: a base plate, a sealing mechanism 1, a sealing mechanism 2 and a protective mechanism. The sealing mechanism 1 is mounted on the base plate, the sealing mechanism 1 comprises a sealing plate 1, the sealing plate 1 is located directly above the base plate, and the sealing mechanism 1 is used to seal the fully metal pipeline; the sealing mechanism 2 is mounted on the base plate, the sealing mechanism 2 comprises two symmetrically arranged sealing plates 2, the sealing plate 2 is slidably mounted on a guide frame, the guide frame is fixedly mounted on the base plate, and the sealing plate 2 is used to seal the fully metal pipeline; the protective mechanism is mounted on the base plate, and the protective mechanism is connected to the base plate. The present invention has a simple structure and is easy to use.

Description

Technical Field

[0001] The invention belongs to the technical field of sealing equipment, and in particular relates to a wellhead secondary sealing device with an all-metal structure. Background Art

[0002] In the extraction of energy resources like oil and natural gas, the wellhead plays a vital role. It is not only the key hub connecting underground and surface pipelines, but also the first line of defense for ensuring the safety of extraction operations and preventing oil and gas leaks.

[0003] Traditional wellhead sealing devices mostly use a single sealing structure, usually with non-metallic materials such as rubber as the main sealing element. Under actual working conditions, as mining progresses, the wellhead faces the test of complex and changing environmental factors. On the one hand, underground oil and gas pressure is not constant, and pressure fluctuates frequently during the mining process. This exerts a continuous impact on the sealing device, which can easily cause the rubber seals to deform and age, leading to a gradual decline in sealing performance. On the other hand, the environment around the wellhead is complex and may contain adverse factors such as chemical corrosive media, high temperatures, and mechanical vibrations. Under these conditions, rubber seals have poor wear and corrosion resistance, and their service life is greatly reduced. Once the seal fails, the potential for oil and gas leakage accidents increases dramatically, not only resulting in energy waste, but also causing serious environmental pollution and even catastrophic consequences such as explosions and fires, posing a huge threat to the safety of on-site workers and the surrounding ecological environment.

[0004] Furthermore, while some existing improvements attempt to enhance sealing effectiveness, they lack structural complexity, cost control, and compatibility with all-metal wellheads. Complex structural designs often come with high manufacturing costs, increased maintenance difficulties, and reduced reliability, making it difficult to meet the demands of efficient, economical, and stable industrial systems. To address these issues, the present invention provides an all-metal wellhead secondary sealing device. Summary of the Invention

[0005] In response to the above technical problems, the technical solution adopted by the present invention is: a fully metal structure wellhead secondary sealing device, comprising:

[0006] base plate;

[0007] Sealing mechanism 1, the sealing mechanism 1 is installed on the bottom plate, the sealing mechanism 1 includes a sealing plate 1, the sealing plate 1 is located directly above the bottom plate, and the sealing mechanism 1 is used to seal the all-metal pipe;

[0008] Sealing mechanism 2, the sealing mechanism 2 is mounted on the bottom plate, the sealing mechanism 2 comprises two symmetrically arranged sealing plates 2, the sealing plates 2 are slidably mounted on a guide frame, the guide frame is fixedly mounted on the bottom plate, and the sealing plates 2 are used to seal the all-metal pipe;

[0009] The protection mechanism is installed on the bottom plate and is connected to the all-metal pipe.

[0010] Furthermore, the sealing mechanism 1 also includes a center rod, one end of the center rod is detachably connected to the sealing plate 1, and the other end of the center rod is fixedly connected to the sliding frame, the sliding frame slides with two symmetrically arranged guide rods 1, the guide rod 1 is fixedly mounted on the bottom plate, a return spring 1 is provided between the sliding frame and the guide rod 1, a movable frame is fixedly mounted on the sliding frame, the movable frame is connected to the pressing assembly, and the movable frame is driven by the pressing assembly to drive the sliding frame downward so that the sealing plate 1 extends into the all-metal pipe.

[0011] Furthermore, two symmetrically arranged positioning plates and two symmetrically arranged positioning rods are fixedly mounted on the sliding frame. When sealing is completed, the positioning plates and positioning rods are connected to the second sealing plate.

[0012] Furthermore, the pressing assembly includes a turntable, a pressure rod is fixedly installed on the side of the turntable close to the movable frame, the pressure rod is slidingly engaged with the movable frame, the side of the turntable away from the movable frame is fixedly connected to the gear, the gear is rotationally engaged with the mounting frame, and the gear is meshed with the rack fixedly mounted on the base plate, and the mounting frame is connected to the power source.

[0013] Furthermore, the sealing mechanism 2 also includes two symmetrically arranged pull rods 1, one end of the pull rod 1 is rotatably connected to the sealing plate 2, and the other end of the pull rod 1 is rotatably connected to the pull rod 2, and a slider is provided at the connection between the pull rod 1 and the pull rod 2, the slider is slidably installed on the support frame, the support frame is fixedly installed on the base plate, the end of the pull rod 2 away from the pull rod 1 is rotatably installed on the T-shaped plate, the T-shaped plate is slidably installed on the base plate, and a rectangular groove is provided on the T-shaped plate.

[0014] Furthermore, positioning hole one and positioning hole two are provided above the sealing plate two, and a stepped platform is provided below the sealing plate two. The radius of the stepped platform is equal to the radius of the sealing clamp. When the sealing plate two completes the sealing, the sealing clamp is in coaxial contact with the stepped platform.

[0015] Furthermore, the second sealing mechanism also includes a driving rod, which is provided with a threaded groove. The threaded groove is slidably matched with the second guide rod fixedly mounted on the base plate. A spline is fixedly mounted on one end of the driving rod, and the other end of the driving rod is rotationally connected to the power source.

[0016] Furthermore, the second sealing mechanism also includes two symmetrically arranged right-angle rods, one end of the right-angle rod is fixedly connected to the second sealing plate, and the other end of the right-angle rod is connected to the extrusion plate, and the extrusion plate is slidably installed inside the air storage bin, and the air storage bin is connected to the sleeve 1 through the air pipe 1, and the sleeve 1 is fixedly installed on the guide frame, and the sleeve 1 is slidably matched with the piston rod 1, and the piston rod 1 is slidably installed on the guide frame, and two sealing clamps are fixedly installed on the piston rod 1.

[0017] Furthermore, the protection mechanism includes two symmetrically arranged air pipes 2, one end of each of the air pipes 2 is connected to the all-metal pipe, and the other end of the air pipe 2 is connected to the air storage bin.

[0018] Furthermore, the protection mechanism also includes two symmetrically arranged sleeves 2, the sleeves 2 are connected to the all-metal pipe, a piston rod 2 is slidably installed inside the sleeves 2, the piston rod 2 is slidably matched with the base plate, and a reset spring 2 is provided between the piston rod 2 and the base plate.

[0019] Compared with the prior art, the present invention has the following advantages: (1) The present invention completes the sealing of the all-metal wellhead by means of the sealing mechanism 1 and the sealing mechanism 2, and after the sealing is completed, the wellhead can be protected by means of a protective structure to prevent excessive internal pressure from damaging the sealing mechanism 1 and the sealing mechanism 2, and the structure is simple and easy to use; (2) After the present invention completes the sealing of the port of the all-metal pipe by means of the sealing mechanism 2, the sealing plate can be sealed by means of a sealing clamp to improve the sealing effect; (3) The present invention completes the sealing of the metal wellhead by means of the sealing mechanism 1 and the sealing mechanism 2 in a coordinated manner, and the sealing effect will be better. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 It is a front view of the overall structure of the present invention.

[0021] Figure 2 It is a top view of the overall structure of the present invention.

[0022] Figure 3 It is a schematic diagram of the overall structure of the present invention.

[0023] Figure 4 for Figure 3 Schematic diagram of the locally enlarged structure at point A in the middle.

[0024] Figure 5This is a schematic diagram of the structure of part of the sealing mechanism.

[0025] Figure 6 for Figure 5 Schematic diagram of the locally enlarged structure at point B in the middle.

[0026] Figure 7 for Figure 5 Schematic diagram of the partially enlarged structure at point C in the middle.

[0027] Figure 8 Schematic diagram of the two-part structure of the sealing mechanism Figure 1 .

[0028] Figure 9 for Figure 8 Schematic diagram of the locally enlarged structure at point D in the middle.

[0029] Figure 10 Schematic diagram of the sealing plate structure.

[0030] Figure 11 It is a structural diagram of the second sealing mechanism.

[0031] Figure 12 Schematic diagram of the two-part structure of the sealing mechanism Figure 2 .

[0032] Figure 13 It is a partial structural diagram of the present invention.

[0033] Figure 14 for Figure 13 Schematic diagram of the locally enlarged structure at point E in the middle.

[0034] Reference numerals: 1-base plate; 2-sealing mechanism 1; 201-sealing plate 1; 202-sliding frame; 203-guide rod 1; 204-reset spring 1; 205-moving frame; 206-positioning plate; 207-positioning rod; 208-turntable; 209-pressing rod; 210-gear; 211-rack; 212-mounting frame; 213-cylinder; 214-center rod; 3-sealing mechanism 2; 301-sealing plate 2; 302-guide frame; 303-positioning hole 1; 304-positioning hole 2; 305-step platform; 306-Pull rod 1; 307-Support frame; 308-Pull rod 2; 309-T-plate; 310-Rectangular groove; 311-Drive rod; 312-Threaded groove; 313-Spline; 314-Guide rod 2; 315-Right-angle rod; 316-Extrusion plate; 317-Air storage tank; 318-Trachea 1; 319-Casing 1; 320-Piston rod 1; 321-Sealing clamp; 4-Protective mechanism; 401-Trachea 2; 402-Casing 2; 403-Piston rod 2; 404-Reset spring 2; 5-All-metal pipe. DETAILED DESCRIPTION

[0035] The following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0036] Example: Figure 1 —— Figure 14 The fully metal structure wellhead secondary sealing device shown includes:

[0037] Base plate 1;

[0038] Sealing mechanism 1 2, which is mounted on the bottom plate 1 and includes a sealing plate 1 201. The sealing plate 1 201 is located directly above the bottom plate 1. The sealing mechanism 1 2 is used to seal the all-metal pipe 5.

[0039] Sealing mechanism 2 3, which is mounted on the base plate 1, comprises two symmetrically arranged sealing plates 301, which are slidably mounted on a guide frame 302, which is fixedly mounted on the base plate 1. The sealing plates 301 are used to seal the all-metal pipe 5;

[0040] The protection mechanism 4 is installed on the base plate 1 and is connected to the all-metal pipe 5 .

[0041] like Figure 1 、 Figure 2 As shown, the all-metal pipe 5 is a pipe installed in the wellhead. When in use, the base plate 1 is placed on the ground in the area where the all-metal pipe 5 is located, and the bottom of the base plate 1 is in contact with the ground. The base plate 1 can be fixed to the ground by landfilling. At this time, the port at the upper end of the all-metal pipe 5 is coaxial with the guide frame 302, and the outer wall of the all-metal pipe 5 is in contact with the inner wall of the guide frame 302.

[0042] The sealing mechanism 2 also includes a center rod 214, one end of which is detachably connected to the sealing plate 201, and the other end of the center rod 214 is fixedly connected to the sliding frame 202. The sliding frame 202 slides with two symmetrically arranged guide rods 203, and the guide rods 203 are fixedly mounted on the base plate 1. A return spring 204 is provided between the sliding frame 202 and the guide rods 203. A moving frame 205 is fixedly mounted on the sliding frame 202, and the moving frame 205 is connected to the pressing component. The pressing component drives the moving frame 205 to drive the sliding frame 202 to move downward, so that the sealing plate 201 extends into the all-metal pipe 5.

[0043] Specifically, the sealing plate 201 can be connected to the central rod 214 through threads or bolts, and the purpose of doing so is to facilitate the replacement of the sealing plate 201.

[0044] like Figure 3 —— Figure 6 As shown, when the upper end of the all-metal pipe 5 is sealed, the pressing assembly will press the movable frame 205 downward. Since the movable frame 205 is fixedly connected to the sliding frame 202, the movable frame 205 will drive the sliding frame 202 to move downward along the guide rod 1 203. During this process, the return spring 1 204 will be stretched. The function of the return spring 1 204 is to assist the sliding frame 202 in resetting. During the descending process of the sliding frame 202, the center rod 214 fixedly connected to the sliding frame 202 will drive the sealing plate 1 201 to move downward, so that the sealing plate 1 201 extends under the end of the all-metal pipe 5, completing the one-time sealing of the all-metal pipe 5.

[0045] Two symmetrically arranged positioning plates 206 and two symmetrically arranged positioning rods 207 are fixedly mounted on the sliding frame 202 . When sealing is completed, the positioning plates 206 and the positioning rods 207 are connected to the second sealing plate 301 .

[0046] The pressing assembly includes a turntable 208, and a pressure rod 209 is fixedly installed on the side of the turntable 208 close to the mobile frame 205. The pressure rod 209 slides with the mobile frame 205. The side of the turntable 208 away from the mobile frame 205 is fixedly connected to the gear 210. The gear 210 rotates with the mounting frame 212, and the gear 210 meshes with the rack 211 fixedly installed on the base plate 1. The mounting frame 212 is connected to the power source.

[0047] Specifically, the power source is the cylinder 213, which is fixedly mounted on the base plate 1. The protruding end of the cylinder 213 is fixedly connected to the mounting frame 212. When the protruding end of the cylinder 213 is extended, the protruding end drives the mounting frame 212 to slide on the base plate 1, causing the gear 210 to roll along the rack 211.

[0048] like Figure 1 —— Figure 3 、 Figure 5 and Figure 7 As shown, when the extended end of the cylinder 213 is extended, the extended end drives the mounting frame 212 to slide on the bottom plate 1, and the gear 210 rotatably mounted on the mounting frame 212 rotates along the rack 211, and the turntable 208 fixedly connected to the gear 210 rotates clockwise (in Figure 5 The pressing rod 209 is rotated as the turntable 208 rotates, and the pressing rod 209 slides relative to the movable frame 205, and the pressing rod 209 presses the movable frame 205 downward.

[0049] The sealing mechanism 2 3 also includes two symmetrically arranged pull rods 1 306, one end of the pull rod 1 306 is rotatably connected to the sealing plate 2 301, and the other end of the pull rod 1 306 is rotatably connected to the pull rod 2 308, and a slider is provided at the connection between the pull rod 1 306 and the pull rod 2 308, and the slider is slidably mounted on the support frame 307, and the support frame 307 is fixedly mounted on the base plate 1, and the end of the pull rod 2 308 away from the pull rod 1 306 is rotatably mounted on the T-shaped plate 309, and the T-shaped plate 309 is slidably mounted on the base plate 1, and a rectangular groove 310 is provided on the T-shaped plate 309.

[0050] like Figure 2 —— Figure 4 、 Figure 8 —— Figure 10 As shown, when the T-plate 309 slides along the bottom plate 1 toward the side close to the central axis of the guide frame 302, the T-plate 309 will pull the pull rod 2 308 to move, so that the pull rod 2 308 drives the slider to slide on the support frame 307, so that the pull rod 1 306 rotatably connected to the slider will move, that is, the end of the pull rod 1 306 away from the support frame 307 drives the sealing plate 2 301 to slide along the guide frame 302 toward the side close to the central axis of the guide frame 302, so that the sealing plate 2 301 covers the hole in the center of the guide frame 302, that is, the two sealing plates 2 301 complete the sealing of the upper port of the all-metal pipe 5.

[0051] Positioning hole one 303 and positioning hole two 304 are provided above sealing plate two 301, and a stepped platform 305 is provided below sealing plate two 301. The radius of the stepped platform 305 is equal to the radius of the sealing clamp 321. When sealing plate two 301 completes sealing, the sealing clamp 321 is in coaxial contact with the stepped platform 305.

[0052] When the sealing plate 2 301 completes the sealing of the port 5 of the all-metal pipe, the positioning plate 206 on the sliding frame 202 will be inserted into the positioning hole 1 303 , and the positioning rod 207 on the sliding frame 202 will be inserted into the positioning hole 2 304 .

[0053] The sealing mechanism 2 3 also includes a driving rod 311, which is provided with a threaded groove 312. The threaded groove 312 slides with a guide rod 2 314 fixedly mounted on the base plate 1. A spline 313 is fixedly mounted on one end of the driving rod 311, and the other end of the driving rod 311 is rotationally connected to the power source.

[0054] like Figure 1 —— Figure 3 、 Figure 7 and Figure 9As shown, when the protruding end of the cylinder 213 is extended, since the driving rod 311 coincides with the central axis of the protruding end and the driving rod 311 rotates with the protruding end, the driving rod 311 will move forward with the protruding end. In the initial state, the spline 313 does not coincide with the rectangular groove 310, so the driving rod 311 will push the T-plate 309 to move, that is, the T-plate 309 drives the sealing plate 2 301 to complete the sealing; in the process of the driving rod 311 moving, since the guide rod 2 314 slides with the thread groove 312, the thread groove 312 will cause the driving rod 311 to rotate under the action of the guide rod 2 314, that is, the spline 313 gradually rotates to a position that coincides with the rectangular groove 310. When the spline 313 coincides with the rectangular groove 310, the driving rod 311 moves forward. The moving drive rod 311 drives the spline 313 through the T-plate 309, at which point the T-plate 309 will no longer move. This is done to first move the T-plate 309 and the gear 210 simultaneously, causing the first sealing plate 201 to first move below the upper end of the all-metal pipe 5 and simultaneously move the second sealing plate 301 above the end of the all-metal pipe 5, i.e., the second sealing plate 301 is coaxial with the hole in the center of the guide frame 302. Secondly, when the T-plate 309 no longer moves, the second sealing plate 301 also does not move, but the rectangular slot 310 can now move, i.e., the first sealing plate 201 will drop a further distance, allowing the positioning plate 206 and positioning rod 207 on the sliding frame 202 to be inserted into the first positioning hole 303 and the second positioning hole 304, respectively, to complete the positioning. After positioning is completed, the cylinder 213 no longer extends.

[0055] The sealing mechanism 2 3 also includes two symmetrically arranged right-angle rods 315, one end of the right-angle rod 315 is fixedly connected to the sealing plate 2 301, and the other end of the right-angle rod 315 is connected to the extrusion plate 316. The extrusion plate 316 is slidably installed inside the air storage bin 317. The air storage bin 317 is connected to the sleeve 1 319 through the air pipe 1 318. The sleeve 1 319 is fixedly installed on the guide frame 302. The sleeve 1 319 is slidably matched with the piston rod 1 320. The piston rod 1 320 is slidably installed on the guide frame 302, and two sealing clamps 321 are fixedly installed on the piston rod 1 320.

[0056] like Figure 10 —— Figure 13As shown, in the process of sealing plate 2 301 moving toward the central axis of guide frame 302, the stepped platform 305 connected to sealing plate 2 301 will also approach the central axis of guide frame 302, so that the right-angle rod 315 pushes the extrusion plate 316 to slide inside the gas storage bin 317, and squeezes the gas in the gas storage bin 317 into sleeve 1 319 through air pipe 1 318. The gas entering sleeve 1 319 will push piston rod 1 320, so that piston rod 1 320 drives the sealing clamp 321 to approach the central axis of guide frame 302, and when sealing plate 2 301 reaches the sealing position, the sealing clamp 321 coincides with the central axis of sealing plate 2 301, that is, the sealing clamp 321 is in close contact with the stepped platform 305 below sealing plate 2 301. The purpose of this is to complete the sealing through the sealing clamp 321 and the stepped platform 305.

[0057] The protection mechanism 4 includes two symmetrically arranged air pipes 401 , one end of each air pipe 401 is connected to the all-metal pipe 5 , and the other end of each air pipe 401 is connected to the air storage bin 317 .

[0058] like Figure 13 —— Figure 14 As shown, when gas is generated in the all-metal pipe 5, the gas will enter the gas storage bin 317 through the gas pipe 2 401 and push the extrusion plate 316, making the sealed space formed by the extrusion plate 316, the gas pipe 1 318 and the sleeve 1 319 more stable.

[0059] The protection mechanism 4 also includes two symmetrically arranged sleeves 402, which are connected to the all-metal pipe 5. A piston rod 403 is slidably installed inside the sleeve 402. The piston rod 403 slides with the base plate 1, and a return spring 404 is provided between the piston rod 403 and the base plate 1.

[0060] like Figure 13 —— Figure 10 As shown in Figure 14, when there is a lot of gas in the all-metal pipe 5, the gas will enter the sleeve 2 402, and then the gas will push the piston rod 2 403 that slides inside the sleeve 2 402, causing the piston rod 2 403 to slide to the side away from the central axis of the all-metal pipe 5. The purpose of this is to allow excess gas to enter the sleeve 2 402, preventing excessive gas from damaging the all-metal pipe 5 and the sealing plate 1 201. The function of the reset spring 2 404 is to assist the reset of the piston rod 2 403.

[0061] The above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit them. Under the concept of the present invention, the technical features in the above embodiments or different embodiments can also be combined, the steps can be implemented in any order, and there are many other variations in different aspects of the present invention as above. For the sake of simplicity, they are not provided in detail. Although the present invention has been described in detail with reference to the above embodiments, ordinary technicians in this field should understand that they can still modify the technical solutions described in the above embodiments, or make equivalent replacements for some of the technical features therein. However, these modifications or replacements do not deviate the essence of the corresponding technical solutions from the scope of the technical solutions of the embodiments of the present invention.

Claims

1. A fully metal wellhead secondary sealing device, characterized in that: include: Bottom plate (1); A sealing mechanism (2), wherein the sealing mechanism (2) is mounted on the bottom plate (1), the sealing mechanism (2) comprises a sealing plate (201), the sealing plate (201) is located directly above the bottom plate (1), and the sealing mechanism (2) is used to seal the all-metal pipe (5); The sealing mechanism (2) further comprises a center rod (214), one end of the center rod (214) being detachably connected to the sealing plate (201), the other end of the center rod (214) being fixedly connected to the sliding frame (202), the sliding frame (202) being slidably matched with two symmetrically arranged guide rods (203), the guide rods (203) being fixedly mounted on the bottom plate (1), a return spring (204) being provided between the sliding frame (202) and the guide rods (203), a movable frame (205) being fixedly mounted on the sliding frame (202), the movable frame (205) being connected to a pressing assembly, and the movable frame (205) being driven by the pressing assembly to drive the sliding frame (202) downward, so that the sealing plate (201) extends into the all-metal pipe (5); Sealing mechanism 2 (3), the sealing mechanism 2 (3) is mounted on the bottom plate (1), the sealing mechanism 2 (3) comprises two symmetrically arranged sealing plates 2 (301), the sealing plates 2 (301) are slidably mounted on a guide frame (302), the guide frame (302) is fixedly mounted on the bottom plate (1), and the sealing plates 2 (301) are used to seal the all-metal pipe (5); The sealing mechanism 2 (3) further comprises two symmetrically arranged pull rods 1 (306), one end of the pull rod 1 (306) being rotatably connected to the sealing plate 2 (301), the other end of the pull rod 1 (306) being rotatably connected to the pull rod 2 (308), and a slider being provided at the connection between the pull rod 1 (306) and the pull rod 2 (308), the slider being slidably mounted on the support frame (307), the support frame (307) being fixedly mounted on the bottom plate (1), the end of the pull rod 2 (308) away from the pull rod 1 (306) being rotatably mounted on the T-shaped plate (309), the T-shaped plate (309) being slidably mounted on the bottom plate (1), and the T-shaped plate (309) being provided with a rectangular groove (310); The sealing mechanism 2 (3) further comprises two symmetrically arranged right-angle rods (315), one end of the right-angle rod (315) being fixedly connected to the sealing plate 2 (301), and the other end of the right-angle rod (315) being connected to the extrusion plate (316), the extrusion plate (316) being slidably mounted inside the gas storage bin (317), the gas storage bin (317) being connected to the sleeve 1 (319) via the air pipe 1 (318), the sleeve 1 (319) being fixedly mounted on the guide frame (302), the sleeve 1 (319) being slidably matched with the piston rod 1 (320), the piston rod 1 (320) being slidably mounted on the guide frame (302), and two sealing clamps (321) being fixedly mounted on the piston rod 1 (320); A protection mechanism (4), wherein the protection mechanism (4) is mounted on the base plate (1), and the protection mechanism (4) is connected to the all-metal pipe (5).

2. The all-metal wellhead secondary sealing device according to claim 1, characterized in that: Two symmetrically arranged positioning plates (206) and two symmetrically arranged positioning rods (207) are fixedly mounted on the sliding frame (202). When sealing is completed, the positioning plates (206) and the positioning rods (207) are connected to the second sealing plate (301).

3. The all-metal wellhead secondary sealing device according to claim 2, characterized in that: The pressing assembly includes a turntable (208), a pressure rod (209) is fixedly installed on the side of the turntable (208) close to the movable frame (205), the pressure rod (209) is slidingly matched with the movable frame (205), and the side of the turntable (208) away from the movable frame (205) is fixedly connected to the gear (210), the gear (210) is rotationally matched with the mounting frame (212), and the gear (210) is meshed with the rack (211) fixedly mounted on the base plate (1), and the mounting frame (212) is connected to a power source.

4. The all-metal wellhead secondary sealing device according to claim 3, characterized in that: A positioning hole 1 (303) and a positioning hole 2 (304) are provided above the sealing plate 2 (301), and a stepped platform (305) is provided below the sealing plate 2 (301). The radius of the stepped platform (305) is equal to the radius of the sealing clamp (321). When the sealing plate 2 (301) completes the sealing, the sealing clamp (321) is in coaxial contact with the stepped platform (305).

5. The all-metal wellhead secondary sealing device according to claim 4, characterized in that: The second sealing mechanism (3) further comprises a driving rod (311), wherein the driving rod (311) is provided with a threaded groove (312), wherein the threaded groove (312) is slidably engaged with a second guide rod (314) fixedly mounted on the base plate (1), a spline (313) is fixedly mounted on one end of the driving rod (311), and the other end of the driving rod (311) is rotatably connected to a power source.

6. The all-metal wellhead secondary sealing device according to claim 5, characterized in that: The protection mechanism (4) comprises two symmetrically arranged air pipes (401), one end of each air pipe (401) being connected to the all-metal pipe (5), and the other end of each air pipe (401) being connected to the air storage bin (317).

7. The all-metal wellhead secondary sealing device according to claim 6, characterized in that: The protection mechanism (4) further comprises two symmetrically arranged sleeves (402), wherein the sleeves (402) are connected to the all-metal pipe (5), a piston rod (403) is slidably mounted inside the sleeves (402), the piston rod (403) is slidably fitted with the bottom plate (1), and a return spring (404) is provided between the piston rod (403) and the bottom plate (1).

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