Production device and production process of metal sealing element for gas production wellhead

Abstract

The invention discloses a production device and a production process of a metal sealing element for a gas production wellhead, and relates to the technical field of sealing element machining equipment.The production device comprises a lathe and a clamp arranged in the lathe, and the clamp comprises a shell, an axis positioning assembly, a vacuum adsorption assembly and a connecting piece. Through the arrangement of the axis positioning assembly, the vacuum adsorption assembly, the connecting piece and the like, a plurality of positioning claws are driven by hydraulic equipment, a multi-stage telescopic sleeve and the like to synchronously move, and based on the communicating vessel principle, the contact pressure of each positioning claw and the sealing piece is kept consistent, so that the axis of the sealing piece is still kept consistent even if the sealing piece is clamped for multiple times, and the sealing piece is not damaged. And the sealing piece is fixed in a vacuum adsorption mode, so that the conditions of stress concentration and overlarge local pressure caused by linear contact between the hard clamping jaw and the workpiece are avoided.

Description

Technical Field

[0001] The present invention relates to the technical field of sealing element processing equipment, and particularly relates to a production device and a production process for metal sealing elements used in gas production wellheads. Background Art

[0002] The metal sealing element for a gas production wellhead is a key component in the gas production wellhead device. It is usually made of materials resistant to high temperature and high pressure and is installed in the annular space of the wellhead device (such as a casing head, tubing head, or blowout preventer). Its core function is to fill the gaps between different components and prevent gas, liquid, or pressure leakage.

[0003] Chinese Patent with application number CN202322259086.7 discloses a numerical control machining center for turning sealing rings. In this invention, the vertical rail support is vertically arranged with the casting base and is specifically used for turning sealing rings. First, the blank barrel material is clamped by the clamping structure. According to the set program, the vertical movement structure, horizontal movement structure, and clamping structure are controlled to move, so that the tool on the turret turns the blank barrel material, and then a sealing ring is turned. By changing the tool and modifying the programming data, various types of sealing rings can be turned. However, when using hard jaws in line contact with the workpiece, it will cause a relatively large local pressure on the workpiece, which will in turn cause microscopic indentations and residual stresses. After the sealing ring is processed, the stress release will cause dimensional springback, resulting in out-of-roundness of the sealing ring exceeding the tolerance. Moreover, when the workpiece is re-clamped, it is easy to produce positioning errors, causing the offset of the inner and outer circle axes and a large coaxiality deviation, which will in turn increase the leakage rate of the dynamic sealing condition of the sealing element.

[0004] Chinese Patent with application number CN201710681440.1 discloses a special fixture for precision hard turning the outer ring of a bearing in machining. In this invention, the dovetail structure is connected to the inner cone sleeve body. Under the action of the outer cone sleeve, the sector slider can slide on the end face of the inner cone sleeve. When the outer cone sleeve clamps the sector slider, the sector slider is always in surface contact with the outer circle of the bearing, which can prevent the bearing ring from deforming when clamped. However, since the inner diameter and outer diameter of the sector slider are determined, when the diameter of the sealing ring exceeds the matching size of the sector slider, the problem of line contact will still occur, and it cannot be applied to clamping sealing rings of various diameters. Moreover, when clamping the sealing ring in the above manner, the processing surface of the sealing ring is small, and the sealing ring needs to be clamped multiple times.

[0005] Therefore, the present invention proposes a production device and a production process for metal sealing elements used in gas production wellheads to solve the above problems. Summary of the Invention

[0006] The purpose of the present invention is to provide a production device and a production process for metal sealing elements used in gas production wellheads to solve the technical problems raised in the above background art.

[0007] To achieve the above object, the present invention provides the following technical solution: a production device for a metal seal for a gas wellhead, comprising a lathe and a fixture, wherein the fixture clamps the seal, and the fixture comprises: A housing fixedly connected to the main shaft of the lathe; The axis center positioning assembly is arranged on the side of the housing away from the main shaft, and comprises a plurality of positioning claws evenly distributed along the circumference of the axis of the housing, one side of the positioning claw is slidably connected with a movable block, and the plurality of positioning claws slide along the radial direction of the housing to position the axis center of the seal; A vacuum adsorption assembly includes an annular cavity formed in a shell, and a surface of the shell is provided with a plurality of adsorption holes connected to the annular cavity; The connecting piece comprises a connecting pipe coaxially fixed in the shell, wherein a hydraulic cavity and an air cavity are arranged in the connecting pipe, and the two are respectively connected to an external hydraulic device and a vacuum generating device to realize the driving of multiple positioning claws and the vacuum adsorption fixing of the sealing member.

[0008] Preferably, the axis positioning assembly further comprises a plurality of slide grooves provided on the housing, the plurality of positioning claws slide in the corresponding slide grooves respectively, a connecting groove is provided in the positioning claw, a plurality of multi-stage telescopic sleeves matching the connecting grooves and communicating with the hydraulic chamber are provided on the circumferential side of the connecting pipe, and one end of the multi-stage telescopic sleeve away from the connecting pipe is fixedly connected to the connecting groove; The hydraulic device controls the extension of the multi-stage telescopic sleeve by pumping hydraulic oil.

[0009] Preferably, a movable groove that seals and slides with the movable block is provided on one side of the positioning claw, and a first elastic member is provided between the movable block and the movable groove, a flow channel connected to the movable groove is provided in the positioning claw, a mounting block is coaxially fixed to one end of the multi-stage telescopic sleeve located in the connecting groove, and a notch that is connected to the flow channel and the multi-stage telescopic sleeve is provided in the mounting block.

[0010] Preferably, a plurality of air pipes in communication with the connecting pipe are fixedly connected to the circumferential side of the connecting pipe, and one end of the air pipe away from the connecting pipe is in communication with the annular cavity.

[0011] Preferably, the plurality of adsorption holes are distributed in a multi-stage annular pattern, a plurality of annular plates are arranged in the annular cavity, a connecting column matching the adsorption holes is arranged on one side of the annular plate, a plurality of circumferentially distributed positioning columns are fixedly connected to a side of the annular plate away from the connecting column, a plurality of positioning grooves matching the positioning columns are opened on the side wall of the annular cavity, and a second elastic member is arranged between the positioning column and the positioning groove; A movable part located in the annular cavity is fixedly connected to the positioning claw, and the movable part can make the corresponding connecting column separate from the adsorption hole when moving.

[0012] Preferably, the movable part includes a connecting rod fixedly connected to the clamping jaw. One end of the connecting rod extending into the annular cavity is fixedly connected with a conical block. The connecting rod is in sealed sliding connection with the housing. When the connecting rod drives the conical block to move in the annular cavity, the conical surface of the conical block contacts the annular plate and causes the annular plate to move to one side.

[0013] Preferably, the annular plate is fixedly connected by a plurality of arc-shaped plates connected end to end.

[0014] Preferably, the side surface of the movable block in contact with the seal is an arc surface.

[0015] Preferably, a partition plate is coaxially fixed in the connecting pipe. The hydraulic cavity and the air cavity are separated by the partition plate. An oil connection pipe and an air connection pipe are arranged on one side of the connecting pipe. One end of the oil connection pipe is communicated with the hydraulic cavity.

[0016] The present invention also provides a production process for a metal seal for a gas production wellhead, including the following steps: Step 1: The worker fits the side surface of the seal to the processing surface of the housing. Step 2: Start the hydraulic equipment to drive multiple multi-stage telescopic sleeves to drive multiple positioning claws to move synchronously, so that the movable block contacts the inner ring of the seal and performs axial positioning on the seal. Step 3: Start the vacuum generating equipment to generate a strong adsorption force in the annular cavity and the communicated adsorption holes to adsorb and fix the seal. Step 4: The hydraulic equipment resets, so that multiple movable blocks are separated from contact with the seal, and during the reset process, the movable blocks retract into the movable grooves. Step 5: Start the lathe to rotate the main shaft, and control the turning tool to perform rough machining or finish machining on the processing surface of the seal. After one rough machining or finish machining is completed, the lathe stops and the seal is flipped to replace the processing surface. Step 6: Turn the groove on the side surface of the seal. Restart the hydraulic equipment to drive multiple multi-stage telescopic sleeves to drive multiple positioning claws to move synchronously, so that the movable block contacts the inner ring of the seal and continuously fixes it, and then repeat Step 5. Step 7: The seal machining is completed.

[0017] The beneficial effects of the present invention are: 1. Through the settings of the axial positioning component, the vacuum adsorption component and the connecting piece, etc., multiple positioning claws move synchronously under the drive of the hydraulic equipment and the multi-stage telescopic sleeves, etc. And based on the principle of the communicating vessel, the contact pressure between each positioning claw and the seal remains the same, so that even if the seal is clamped multiple times, its axis still remains the same. And the seal is fixed by means of vacuum adsorption, avoiding the stress concentration and excessive local pressure caused by the line contact between the hard clamping claws and the workpiece.

[0018] 2. The present invention enables the movable block on the positioning claw to be retracted into the movable groove, and cooperates with the vacuum adsorption method to enable the turning tool to process multiple processing surfaces of the seal at the same time, thereby reducing the number of clamping times.

[0019] 3. The present invention is provided with an axial positioning component, a vacuum adsorption component and a connecting piece. When the seal is a standard gas wellhead seal such as R type, RX type and BX type, since there is no groove on the side of the seal, the vacuum adsorption component can achieve effective adsorption of the seal, avoiding the problem of stress concentration on the seal caused by the hard claws. Even for the seal with a groove on the side, through the cooperation of the positioning claw, the movable block and the vacuum adsorption component, the clamping force of the movable block on the inner ring of the seal is reduced on the basis of ensuring the fixity of the seal, thereby improving the problem of partial stress concentration on the seal.

[0020] 4. The present invention arranges multiple annular plates, adsorption holes and movable parts so that the movable parts cooperate with the positioning claws. When the positioning claws locate the seal axially, the movable parts move with the positioning claws and make the corresponding annular plates drive the connecting columns to disengage from the adsorption holes, so that the clamp can clamp seals with multiple diameters, and the annular cavity can ensure that the adsorption force of multiple adsorption holes remains consistent, preventing the workpiece from deflecting during cutting. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 It is a schematic diagram of the overall structure of the production device of the present invention.

[0022] Figure 2 It is a schematic diagram of the three-dimensional structure of the clamp of the present invention.

[0023] Figure 3 It is a schematic diagram of the planar structure of the clamp of the present invention.

[0024] Figure 4 for Figure 3 Schematic diagram of the cross section at AA in the middle.

[0025] Figure 5 It is a three-dimensional structural schematic diagram of the positioning claw and the movable part of the present invention.

[0026] Figure 6 It is a schematic diagram of the three-dimensional structure of the connecting piece of the present invention.

[0027] Figure 7 It is a schematic diagram of the three-dimensional structure of multiple annular plates and their accessories of the present invention.

[0028] Figure 8 It is a schematic diagram of the finished product of the sealing component of the present invention after processing.

[0029] The accompanying drawings are marked as follows: 1. Lathe; 2. Fixture; 21. Housing; 3. Axis positioning assembly; 31. Positioning claw; 311. Moving slot; 312. Runner; 32. Moving block; 4. Vacuum adsorption assembly; 41. Annular cavity; 411. Positioning slot; 42. Adsorption hole; 43. Slide groove; 44. Connection groove; 45. Multi-stage telescopic sleeve; 451. Mounting block; 452. Notch; 46. Annular plate; 461. Connecting column; 462. Positioning column; 5. Connector; 51. Connecting pipe; 52. Hydraulic cavity; 53. Air cavity; 54. Air pipe; 55. Partition plate; 56. Oil connection pipe; 57. Air connection pipe; 6. Movable part; 61. Connecting rod; 62. Tapered block; 7. Seal. Detailed implementation manner

[0030] 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. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative labor fall within the protection scope of the present invention.

[0031] Embodiment 1 In the actual production process, when using a hard jaw to contact the workpiece linearly, it will cause a relatively large local pressure on the workpiece, which will in turn cause microscopic indentation and residual stress. After the seal is processed, the stress release will cause dimensional springback, resulting in an out-of-roundness of the seal exceeding the tolerance. Moreover, when the workpiece is re-clamped, it is easy to generate a positioning error, causing the inner and outer circle axes to shift and a large coaxiality deviation, which will in turn lead to an increase in the leakage rate of the dynamic seal condition of the seal. To solve the above problems, this embodiment is specifically invented.

[0032] Please refer to Figures 1 to 8 As shown in the figure, a production device for a metal seal for a gas production wellhead according to an embodiment of the present invention includes a lathe 1 and a fixture 2 provided in the lathe 1. The fixture 2 holds a seal 7, and the seal 2 is circular ring-shaped; the fixture 2 includes a housing 21, an axis positioning assembly 3, a vacuum adsorption assembly 4, and a connector 5.

[0033] The housing 21 is fixedly connected to the main shaft of the lathe 1 and can rotate with the main shaft.

[0034] The axis positioning assembly 3 is arranged on the side of the housing 21 away from the main shaft. The axis positioning assembly 3 includes a plurality of positioning claws 31 circumferentially and evenly distributed along the axis of the housing 21. One side of the positioning claw 31 is slidably connected to a moving block 32. When the plurality of positioning claws 31 slide radially along the housing 21, the moving block 32 cooperates with the positioning claws 31 to perform axis positioning on the seal 7.

[0035] The vacuum adsorption assembly 4 is arranged inside the housing 21, and it includes an annular cavity 41 opened inside the housing 21. A plurality of adsorption holes 42 communicating with the annular cavity 41 are opened on the surface of the housing 21.

[0036] The connecting piece 5 is coaxially arranged inside the housing 21, and it includes a connecting pipe 51 fixedly connected with the housing 21. A hydraulic cavity 52 and an air cavity 53 are arranged inside the connecting pipe 51. One end of the connecting pipe 51 is externally connected to a hydraulic device communicating with the hydraulic cavity 52 and a vacuum generating device communicating with the air cavity 53. The hydraulic device can drive a plurality of positioning claws 31 to move, and the vacuum generating device fixes the seal 7 through adsorption force.

[0037] A partition plate 55 is coaxially fixed inside the connecting pipe 51. The hydraulic cavity 52 and the air cavity 53 are separated by the partition plate 55. An oil connection pipe 56 and an air connection pipe 57 are arranged on one side of the connecting pipe 51. One end of the oil connection pipe 56 communicates with the hydraulic cavity 52.

[0038] The axis positioning assembly 3 further includes a plurality of sliding grooves 43 opened on the housing 21. A plurality of positioning claws 31 slide in the corresponding sliding grooves 43 respectively. A connecting groove 44 is opened inside the positioning claw 31. A plurality of multi-stage telescopic sleeves 45 matching with the connecting groove 44 and communicating with the hydraulic cavity 52 are arranged on the circumferential side of the connecting pipe 51. One end of the multi-stage telescopic sleeve 45 far from the connecting pipe 51 is fixedly connected with the connecting groove 44; The hydraulic device can control the extension of the multi-stage telescopic sleeve 45 by pumping hydraulic oil and make a plurality of positioning claws 31 move synchronously.

[0039] In this embodiment, the hydraulic device includes an oil storage barrel. A piston rod is hermetically and slidably connected inside the oil storage barrel, and a pressure sensor is arranged on the inner wall of the oil storage barrel to monitor the pressure of the hydraulic oil inside the oil storage barrel, so as to feedback the clamping force of the movable block 32 on the seal 7. A hydraulic cylinder is arranged on the side of the piston rod extending out of the oil storage barrel. One end of the oil storage barrel far from the hydraulic cylinder is connected with the oil connection pipe 56 through a pipeline. The hydraulic cylinder can drive the piston rod to slide inside the oil storage barrel and make the hydraulic oil inside the oil storage barrel enter the hydraulic cavity 52 through the oil connection pipe 56. A plurality of positioning claws 31 move synchronously driven by the multi-stage telescopic sleeve 45, so as to realize the axis positioning of the seal 7.

[0040] In this embodiment, the vacuum generating device includes a vacuum pump. The vacuum pump is externally connected with a pneumatic vacuum generator and a vacuum accumulator. The pneumatic vacuum generator is connected with the air connection pipe 57 through a pipeline. When the vacuum pump is started, a strong suction force is generated inside the annular cavity 41 and the adsorption holes 42, so that the side surface of the seal 7 is tightly adsorbed on the housing 21, and the adsorption force generated by the vacuum pump is at least twice the cutting force of the turning tool.

[0041] On one side of the positioning claw 31, an activity groove 311 matching the movable block 32 is provided. The movable block 32 is in sealed sliding connection with the activity groove 311, and a first elastic member is arranged between the movable block 32 and the activity groove 311. A flow channel 312 communicating with the activity groove 311 is opened in the positioning claw 31. At one end of the multi-stage telescopic sleeve 45 located in the connection groove 44, an installation block 451 is coaxially fixed. An opening 452 communicating with the flow channel 312 and the multi-stage telescopic sleeve 45 is opened in the installation block 451.

[0042] The side surface of the movable block 32 in contact with the seal 7 is an arc surface.

[0043] A plurality of air pipes 54 communicating with the connecting pipe 51 are fixedly connected to the circumferential side of the connecting pipe 51. One end of the air pipe 54 far from the connecting pipe 51 communicates with the annular cavity 41.

[0044] During use, when the seal is a gas extraction wellhead seal standard part such as R type, RX type and BX type, since no groove is provided on the side surface of the seal 7, the worker fits the seal 7 on the housing 21, starts the hydraulic equipment to drive the piston rod to slide in the oil storage barrel by the hydraulic cylinder, and the hydraulic oil in the oil storage barrel enters the hydraulic cavity 52 through the oil connecting pipe 56. The plurality of positioning claws 31 move synchronously driven by the multi-stage telescopic sleeve 45, so as to realize the axial center positioning of the seal 7.

[0045] Start the vacuum generating equipment to form a strong adsorption force in the annular cavity 41 and the adsorption holes 42, so that the side surface of the seal 7 is tightly adsorbed on the housing 21. After the clamping of the seal 7 is completed, the hydraulic cylinder drives the piston rod to reset and the hydraulic oil in the hydraulic cavity 52 is recovered into the oil storage barrel. At this time, the pressure in the plurality of activity grooves 311 decreases, and the first elastic member drives the movable block 32 to retract into the activity groove 311, and the plurality of telescopic sleeves gradually contract and drive the corresponding positioning claws 31 to reset. Finally, start the lathe 1 to perform rough machining and finish machining on the seal 7.

[0046] In addition, for the seal 7 with a groove provided on the side surface, when turning the groove on the side surface, only need to restart the hydraulic equipment to drive the plurality of positioning claws 31 to move synchronously driven by the multi-stage telescopic sleeve 45, and ensure that the movable block 32 is always in contact with the seal 7. With the cooperation of the vacuum adsorption assembly 4 and the axial center positioning assembly 3, the seal 7 is double-fixed to ensure that it will not deflect during turning. On this basis, the hydraulic equipment can appropriately reduce the clamping force of the movable block 32 on the seal 7 to avoid the problem of local stress concentration caused by excessive clamping force.

[0047] In summary, through the settings of the axis positioning component 3, the vacuum adsorption component 4, the connecting piece 5, etc., multiple positioning claws 31 move synchronously driven by a hydraulic device, a multi-stage telescopic sleeve 45, etc. And based on the principle of communicating vessels, the contact pressure between each positioning claw 31 and the seal 7 remains consistent, so that even if the seal 7 is clamped multiple times, its axis still remains consistent. Moreover, the seal 7 is fixed by means of vacuum adsorption, avoiding stress concentration and excessive local pressure caused by line contact between the hard clamping claws and the workpiece. And the use of vacuum adsorption can enable the turning tool to process multiple machining surfaces of the seal 7 simultaneously, reducing the number of clamping times.

[0048] Through the settings of the axis positioning component 3, the vacuum adsorption component 4, the connecting piece 5, etc. in the present invention, when the seal is a gas production well seal standard part such as R type, RX type, and BX type, since no groove is provided on the side surface of the seal 7, the vacuum adsorption component 4 can effectively adsorb the seal 7, avoiding the problem of stress concentration caused by the hard clamping claws to the seal 7. Even for the seal 7 with a groove provided on the side surface, through the cooperation of the positioning claw 31, the movable block 32, and the vacuum adsorption component 4, while ensuring the fixity of the seal 7, the clamping force of the movable block 32 on the inner ring of the seal 7 is reduced, improving the problem of partial stress concentration of the seal 7.

[0049] Embodiment 2 In order to improve the universality of the fixture 2 so that it can adapt to seals 7 with different diameters, further improvements are made on the basis of the above embodiment.

[0050] Please refer to Figures 4 to 7 As shown, multiple adsorption holes 42 are distributed in a multi-stage annular shape. A plurality of annular plates 46 are arranged in the annular cavity 41. One side of the annular plate 46 is provided with a connecting column 461 matching the adsorption hole 42. A plurality of circumferentially distributed positioning columns 462 are fixedly connected to the side of the annular plate 46 away from the connecting column 461. A plurality of positioning grooves 411 matching the positioning columns 462 are formed on the side wall of the annular cavity 41. A second elastic member is arranged between the positioning column 462 and the positioning groove 411.

[0051] A movable member 6 located in the annular cavity 41 is fixedly connected to the positioning claw 31. When the movable member 6 moves with the positioning claw 31, the movable member 6 can make the corresponding connecting column 461 disengage from the adsorption hole 42, enabling the fixture 2 to adsorb and fix seals 7 with different diameters.

[0052] The movable member 6 includes a connecting rod 61 fixedly connected to the clamping claw. One end of the connecting rod 61 extending into the annular cavity 41 is fixedly connected with a conical block 62. The connecting rod 61 is in sealed sliding connection with the housing 21. And when the connecting rod 61 drives the conical block 62 to move in the annular cavity 41, the conical surface of the conical block 62 contacts the annular plate 46 and makes the annular plate 46 move to one side.

[0053] The annular plate 46 is fixedly connected by a plurality of arc-shaped plates connected end to end.

[0054] During use, when a plurality of positioning claws 31 move driven by the multi-stage telescopic sleeve 45, the conical surface of the conical block 62 contacts the annular plate 46 and causes the annular plate 46 to drive the connecting column 461 to disengage from the adsorption hole 42. When the movable block 32 contacts the seal 7, the adsorption hole 42 adapted to the diameter of the seal 7 communicates with the annular cavity 41, and the remaining adsorption holes 42 are all in a closed state. After being evacuated by a vacuum generating device, the seal 7 can be tightly adsorbed on the fixture 2.

[0055] In summary, through the settings of a plurality of annular plates 46, adsorption holes 42, and movable members 6, etc., a cooperation is formed between the movable member 6 and the positioning claws 31. When the positioning claws 31 perform axial positioning on the seal 7, the movable member 6 moves following the positioning claws 31 and causes the corresponding annular plate 46 to drive the connecting column 461 to disengage from the adsorption hole 42, enabling the fixture 2 to clamp seals 7 with multiple diameters, and the annular cavity 41 can ensure that the adsorption forces of the plurality of adsorption holes 42 are consistent, preventing the workpiece from deflecting during cutting.

[0056] Embodiment 3 The present invention also provides a production process for a metal seal for a gas production wellhead, including the following steps: Step 1: Workers fit the side surface of the seal 7 to the machining surface of the housing 21. Step 2: Start the hydraulic device to drive a plurality of multi-stage telescopic sleeves 45 to drive a plurality of positioning claws 31 to move synchronously, so that the movable block 32 contacts the inner ring of the seal 7 and performs axial positioning on the seal 7. Step 3: Start the vacuum generating device to generate a strong adsorption force in the annular cavity 41 and the conducting adsorption holes 42 and thereby adsorb and fix the seal 7. Step 4: The hydraulic device resets, causing a plurality of movable blocks 32 to disengage from the seal 7, and during the reset process, the movable blocks 32 retract into the movable grooves 311. Step 5: Start the lathe 1 to rotate the main shaft, and control the turning tool to perform rough machining or finish machining on the machining surface of the seal 7. After one rough machining or finish machining is completed, the lathe 1 stops and the seal 7 is flipped to replace the machining surface. Step 6: Turn the groove on the side surface of the seal 7. Restart the hydraulic device to drive a plurality of multi-stage telescopic sleeves 45 to drive a plurality of positioning claws 31 to move synchronously, so that the movable block 32 contacts the inner ring of the seal 7 and continuously fixes it, and then repeat Step 5. Step 7: The machining of the seal 7 is completed.

[0057] It should be noted that for the common types of seals at the gas production wellhead, most of their sides are not provided with grooves. For example, for the metal seals 7 of the BX type, RX type, and R type series, when turning these types of seals, step six can be skipped.

[0058] As mentioned above, the above are only the preferred specific embodiments of the present invention, but the protection scope of the present invention is not limited thereto. Any person skilled in the art within the technical scope disclosed by the present invention, according to the technical solution and inventive concept of the present invention, making equivalent substitutions or changes should be covered within the protection scope of the present invention.

Claims

1. A production device for a metal seal for a gas wellhead, comprising a lathe (1) and a fixture (2), wherein the fixture (2) holds a seal (7), and is characterized in that: The clamp (2) comprises: A housing (21) fixedly connected to a main shaft of the lathe (1); An axial center positioning assembly (3) is arranged on a side of the housing (21) away from the main shaft, and comprises a plurality of positioning claws (31) uniformly distributed along the circumference of the axis of the housing (21), a movable block (32) being slidably connected to one side of the positioning claws (31), and the plurality of positioning claws (31) slide along the radial direction of the housing (21) to perform axial center positioning on the sealing member (7); A vacuum adsorption component (4), comprising an annular cavity (41) formed in a shell (21), and a plurality of adsorption holes (42) in communication with the annular cavity (41) formed on a surface of the shell (21); The connecting member (5) comprises a connecting pipe (51) coaxially fixed in the housing (21), wherein a hydraulic chamber (52) and an air chamber (53) are provided in the connecting pipe (51), and the two chambers are respectively connected to an external hydraulic device and a vacuum generating device to achieve the driving of the plurality of positioning claws (31) and the vacuum adsorption fixing of the sealing member (7).

2. The production device of a metal seal for a gas wellhead according to claim 1, characterized in that: The axis positioning assembly (3) further comprises a plurality of slide grooves (43) formed on the housing (21), the plurality of positioning claws (31) respectively slide in the corresponding slide grooves (43), a connecting groove (44) is formed in the positioning claws (31), a plurality of multi-stage telescopic sleeves (45) matching the connecting grooves (44) and communicating with the hydraulic chamber (52) are provided on the circumferential side of the connecting pipe (51), and one end of the multi-stage telescopic sleeves (45) away from the connecting pipe (51) is fixedly connected to the connecting groove (44); The hydraulic device controls the extension of the multi-stage telescopic sleeve (45) by pumping hydraulic oil.

3. A production device for a metal seal for a gas wellhead according to claim 2, characterized in that: A movable groove (311) is provided on one side of the positioning claw (31) and is sealingly and slidably matched with the movable block (32), and a first elastic member is provided between the movable block (32) and the movable groove (311); a flow channel (312) is provided in the positioning claw (31) and is connected to the movable groove (311); a mounting block (451) is coaxially fixed to one end of the multi-stage telescopic sleeve (45) located in the connecting groove (44); and a notch (452) is provided in the mounting block (451) and is connected to the flow channel (312) and the multi-stage telescopic sleeve (45).

4. A production device for a gas wellhead seal according to claim 3, characterized in that: A plurality of air pipes (54) in communication with the connecting pipe (51) are fixedly connected to the circumferential side of the connecting pipe (51), and one end of the air pipe (54) away from the connecting pipe (51) is in communication with the annular cavity (41).

5. The production device of a metal seal for a gas wellhead according to claim 4, characterized in that: The plurality of adsorption holes (42) are distributed in a multi-stage annular shape, a plurality of annular plates (46) are arranged in the annular cavity (41), a connecting column (461) matching the adsorption holes (42) is arranged on one side of the annular plate (46), a plurality of circumferentially distributed positioning columns (462) are fixedly connected to a side of the annular plate (46) away from the connecting column (461), a plurality of positioning grooves (411) matching the positioning columns (462) are provided on the side wall of the annular cavity (41), and a second elastic member is arranged between the positioning columns (462) and the positioning grooves (411); A movable part (6) located in the annular cavity (41) is fixedly connected to the positioning claw (31), and the movable part (6) can cause the corresponding connecting column (461) to be separated from the adsorption hole (42) when moving.

6. A production device for a metal seal for a gas wellhead according to claim 5, characterized in that: The movable member (6) comprises a connecting rod (61) fixedly connected to the claw, one end of the connecting rod (61) extending into the annular cavity (41) is fixedly connected to a conical block (62), the connecting rod (61) and the housing (21) are in sealed sliding connection, and when the connecting rod (61) drives the conical block (62) to move in the annular cavity (41), the conical surface of the conical block (62) contacts the annular plate (46) and causes the annular plate (46) to move to one side.

7. A production device for a metal seal for a gas wellhead according to claim 6, characterized in that: The annular plate (46) is formed by a plurality of arc-shaped plates connected end to end and fixedly connected.

8. The production device of a metal seal for a gas wellhead according to claim 7, characterized in that: The side surface of the movable block (32) in contact with the sealing member (7) is a curved surface.

9. A production device for a metal seal for a gas wellhead according to claim 8, characterized in that: A partition plate (55) is coaxially fixed inside the connecting pipe (51), and the hydraulic chamber (52) and the air chamber (53) are separated by the partition plate (55). An oil connecting pipe (56) and an air connecting pipe (57) are provided on one side of the connecting pipe (51), and one end of the oil connecting pipe (56) is in communication with the hydraulic chamber (52).

10. A production process for a metal seal for a gas wellhead, using a production device for a metal seal for a gas wellhead as claimed in any one of claims 1 to 9 to process the metal seal, characterized in that: The following steps are involved: Step 1: A worker fits the side surface of the seal (7) to the machined surface of the housing (21); Step 2: starting the hydraulic device to make the multiple multi-stage telescopic sleeves (45) drive the multiple positioning claws (31) to move synchronously, so that the movable block (32) contacts the inner ring of the sealing member (7) and performs axial positioning on the sealing member (7); Step 3: starting the vacuum generating device to generate a strong adsorption force in the annular cavity (41) and the connected adsorption hole (42) to adsorb and fix the sealing member (7); Step 4: The hydraulic device is reset, so that the plurality of movable blocks (32) are out of contact with the sealing member (7), and during the reset process, the movable blocks (32) are retracted into the movable grooves (311); Step 5: starting the lathe (1) to rotate the spindle, and controlling the turning tool to perform rough machining or fine machining on the machining surface of the seal (7), and after the rough machining or fine machining is completed, the lathe (1) is stopped and the seal (7) is turned over to replace the machining surface; Step 6: Turning the groove on the side of the sealing member (7), restarting the hydraulic equipment to make the multiple multi-stage telescopic sleeves (45) drive the multiple positioning claws (31) to move synchronously, so that the movable block (32) contacts and continuously fixes the inner ring of the sealing member (7), and then repeating step 5; Step 7: The sealing part (7) is processed.

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