A positioning fixture for oil pipe head processing with double protection structure

Abstract

The present invention discloses a positioning fixture for processing an oil pipe head with a double protection structure, comprising a base mounting structure, a protection positioning structure fixed on the base mounting structure, the base mounting structure comprising a base rotating component on which an adjustment protection component is fixedly mounted, and the base rotating component comprises a base platform with a through hole and a groove, and at the same time, an annular groove connected to a guide through the limiting hole is opened inside the groove, the limiting hole and the annular groove are both connected to a connection plate with a convex circle fixed on the surface for adjustment and limitation, and the bottom of the connecting plate is installed and connected to the lower part of the base platform through a connecting shaft and a bearing seat, and at the same time, a mounting column for mounting support for the adjustment protection component is fixed on the connecting plate, the adjustment protection component comprises a mounting frame with a hollow structure inside, and the mounting frame is fixed to the connecting plate through the mounting column. The positioning fixture for processing an oil pipe head with a double protection structure plays a role of rotational friction contact limitation through the arranged convex circle.

Description

Technical Field

[0001] The invention relates to the technical field of tubing head processing, in particular to a positioning fixture for tubing head processing with a double protection structure. Background Art

[0002] The tubing head is a device component that connects the top casing head and the oil (gas) tree to suspend the oil pipe and seal the annular space between the oil pipe and the casing; the tubing head is located on the casing head, including a casing spool and a tubing hanger, and its function is to suspend the oil pipe and downhole tools lowered into the well and seal the annular space of the casing; the casing head is generally made of 35 or 42 chromium-molybdenum high-quality alloy structural steel, and a casing hanger is also arranged in the casing head to suspend the casing string of corresponding specifications and seal the annular space gap, on which a blowout preventer group is to be installed. After the oil well is completed, the oil tree is installed on the casing head. After searching the prior art, the publication number is: CN110270844A, a new type of tubing head and casing head processing device, belonging to the technical field of tubing head manufacturing fixture. A novel tubing head and casing head processing device comprises a fixed base plate, a first T-slot and a second T-slot are cut on the top wall of the fixed base plate, a first V-shaped slider is slidably connected inside the first T-slot, a second V-shaped slider and a bearing seat are slidably connected inside the second T-slot, an axial stop seat is also connected to the fixed base plate, a screw rod is connected to the axial stop seat, the screw rod passes through the second V-shaped slider and is connected to the inner wall of the axial stop seat, and the screw rod matches the bearing seat; the present invention reduces the management cost and the repair and maintenance cost of the processing device, improves the processing accuracy and the core competitiveness of the enterprise, and has a simple manufacturing structure and assembly, is easy to use, can be applied to various working environments, and greatly improves the processing efficiency.

[0003] In summary: although the positioning fixture in the above scheme can perform positioning processing on the tubing head and the casing head, the movable adjustment limit in the above scheme is installed and fixed by the fixing nut, so there is trouble in the subsequent adjustment and disassembly after the parts are adjusted. In addition, although the above scheme mentions that the tubing head and the casing head are processed and fixed by the overlapping and fastening device, the overall specification drawings in the above scheme do not show how the fastening device processes and fixes the tubing head and the casing head. At the same time, the positioning fixture in the above scheme cannot change the processing angle and rotation angle of the tubing head and the casing head. Summary of the invention

[0004] The purpose of the present invention is to address the deficiencies in the prior art and provide a positioning fixture for tubing head processing with a double protection structure to solve the problem that the movable adjustment limit in the above-mentioned scheme proposed in the above-mentioned background technology is installed and fixed by fixing nuts, which causes troubles in subsequent adjustment and disassembly after the parts are adjusted. Although the above-mentioned scheme mentions that the tubing head and the casing head are processed and fixed by a lap-pressing fastening device, the overall specification drawings of the above-mentioned scheme do not show how the fastening device processes and fixes the tubing head and the casing head. At the same time, the positioning fixture in the above-mentioned scheme cannot change the processing angle and rotation angle of the tubing head and the casing head.

[0005] To achieve the above object, the present invention provides the following technical solution: a positioning fixture for processing a tubing head with a double protection structure, comprising a base mounting structure, on which a protection positioning structure is fixed;

[0006] The base installation structure includes a base rotating assembly on which the adjusting protection assembly is fixedly installed, and the base rotating assembly includes a base platform with a through hole and a groove, and an annular groove connected to the limit hole through the inner part of the groove is provided;

[0007] The limiting holes and the annular grooves are both connected to the connection plate with a convex surface for adjustment and limiting, and the bottom of the connection plate is connected to the lower part of the base through a connecting shaft and a bearing seat. At the same time, a mounting column is fixed on the connection plate to support the installation of the adjustment protection component.

[0008] By adopting the above technical solution, the convex circle is provided to achieve rotational friction contact limiting.

[0009] Preferably, the adjustment and protection component includes an installation frame with a hollow structure inside, and the installation frame is fixed to the connecting plate through a mounting column. At the same time, a handwheel linear motor group is rotatably installed inside the installation frame, and a gear group that meshes with the chain for adjustment is fixed at one end of the handwheel linear motor group.

[0010] By adopting the above technical solution, manual rotation adjustment is achieved through the provided handwheel linear motor group.

[0011] Preferably, connecting pins are fixed on both sides of the installation frame, and the connecting pins pass through the adjustment plate with through holes at the bottom for rotational connection. At the same time, a rotatable and foldable protective cloth is installed on the surface of the adjustment plate. Threaded hollow blocks are fixed on both sides of the surface of the installation frame, and rotating nuts for adjusting the extrusion limit of the adjustment plate are installed on the surface of the blocks.

[0012] By adopting the above technical solution, the arranged concave blocks can be used to place and limit the expansion of the adjustment plate.

[0013] Preferably, the protective positioning structure includes a mounting table that is slidably adjusted with the handwheel linear motor group components, and a guide groove is provided on the surface of the mounting table, and iron bars are laid inside the guide groove. A sliding groove is provided on the surface of the mounting table, and a limit connection hole for connection limit is provided on the surface of the sliding groove.

[0014] By adopting the above technical solution, the setting up of the installation platform can achieve the functions of opening, installation and fixing.

[0015] Preferably, the guide groove is slidably connected to the magnetic guide block, and the magnetic guide block is fixedly connected to one side of the first through hole plate, and a limit frame for adjusting the limit by inserting into the limit connecting hole is movably installed on the surface of the first through hole plate, and a sliding adjustment plate which also has another guide groove is fixed on the first through hole plate, and a limit groove for connecting the limit is provided on the sliding adjustment plate, and the sliding adjustment plate is slidably connected to the V-shaped slider through a T-shaped slider.

[0016] By adopting the above technical solution, the magnetic guide block is provided to achieve magnetic adjustment and limit adsorption.

[0017] Preferably, a through cylinder with a hollow structure is fixed on the rear side of the V-shaped slider, and the upper part of the through cylinder is fixedly connected to one end of a connecting spring, while the other end of the connecting spring is fixedly connected to one side of a through-hole adjustment plate. A connecting rod is provided in the through cylinder, which extends to both ends of the through cylinder and is fixed to the through-hole adjustment plate.

[0018] By adopting the above technical solution, bidirectional installation and fixation are achieved through the provided connecting spring.

[0019] Preferably, one end of the connecting rod is fixedly connected to the grip plate, and the other end of the connecting rod is fixedly connected to the limit plate, one side of the first through-hole plate is fixedly connected to one side of the connecting column through a fixing plate, and a threaded rod is fixed on the connecting column, and the threaded rod passes through the second through-hole plate and is threadedly connected to the nut, and the inner side of the connecting column is also fixedly connected to the handwheel linear motor group components through a fixing plate.

[0020] By adopting the above technical solution, the threaded connection is limited by the provided threaded column.

[0021] Preferably, a pressing plate for limiting the installation of the tubing head or casing head is fixed at the bottom of the second through-hole plate, and the pressing plate is installed in the form of an "arc-shaped plate".

[0022] By adopting the above technical solution, the provided pressing plate can play a role in sliding and pressing the material to limit the position.

[0023] Preferably, the protective cloth is made of flexible transparent cloth, and the overall thickness of the protective cloth is set in the range of 0.3-0.5 cm.

[0024] By adopting the above technical solution, the protective cloth is provided to achieve folding and unfolding protection.

[0025] Compared with the prior art, the beneficial effects of the present invention are: the positioning fixture for processing the tubing head with a double protection structure,

[0026] (1) In this case, the protective positioning structure is provided with: guide grooves, iron bars, sliding grooves, limit connection holes, first through-hole plates and limit frames, so as to solve the problem that the movable adjustment limit in the above scheme is fixed by fixing nuts. In this way, after the parts are adjusted, there are troubles in subsequent adjustment and disassembly. When it is necessary to adjust the relative sliding interval distance between the V-shaped sliders, the operator uses the handwheel linear motor group to drive the connecting column, the first through-hole plate and the V-shaped slider to slide relative adjustment. When the V-shaped slider slides the corresponding interval distance, the operator uses the limit frame to penetrate the first through-hole plate and connect it with the limit connection hole to play a secondary adjustment limit effect for the first through-hole plate, thereby avoiding the problem that the limit frame is unstable and unreliable when the limit is adjusted by the limit frame or the handwheel linear motor group alone;

[0027] (2) The above-mentioned problem is solved by the following means: the sliding adjustment plate, the limiting groove, the through cylinder, the connecting spring, the through-hole adjustment plate, the connecting rod, the gripping plate and the limiting plate provided in the protective positioning structure. When a single V-shaped slider needs to be slid and adjusted, the operator uses the gripping plate to pull the connecting rod to drive the limiting plate and the limiting groove to separate under force, thereby pushing the single V-shaped slider to slide and adjust. When the single V-shaped slider is adjusted to the corresponding position, the operator releases the gripping plate. At this time, the limiting plate and the limiting groove are connected to limit the single V-shaped slider to play an adjustment and limiting effect;

[0028] (3) The protective positioning structure is provided with: a connecting column, a threaded rod, a second through-hole plate and a pressure plate, so as to solve the problem that although the above scheme mentions that the tubing head and the casing head are processed and fixed by the overlapping and fastening device, the overall description drawings in the above scheme do not show how the fastening device processes and fixes the tubing head and the casing head. When the connecting column is subjected to synchronous force and relatively slidably adjusted, the connecting column drives the threaded rod to synchronously slide and adjust relatively. When the threaded rod is adjusted to the corresponding position, the operator passes the second through-hole plate and the pressure plate through the threaded rod so that the pressure plate is matched with the surface of the tubing head or the casing head. Then the operator uses the fixing nut to thread the threaded rod to limit the second through-hole plate. In addition, the above components are used not only to provide fixed limit protection for the tubing head or the casing head during the processing, but also to prevent the operator from dropping the material or colliding with the machine due to displacement during the processing;

[0029] (4) The base rotating assembly is provided in the base mounting structure, thereby solving the problem that the positioning fixture in the above scheme cannot change the processing angle and rotation angle of the tubing head and the casing head. When the tubing head or the casing head needs to be adjusted and processed, the operator pushes the mounting column to drive the connecting disk to rotate under force. When the connecting disk is rotated under force, the convex circle is driven to rotate relative to the limiting hole and the annular groove. When the connecting disk is rotated and adjusted to the corresponding angle position, the tubing head and the casing head are synchronously driven to rotate under force, which facilitates the rotation and rotation processing of the tubing head and the casing head.

[0030] (5) By means of the protective adjustment component provided in the base mounting structure, protection is provided on both sides of the tubing head or casing head during processing. When the tubing head or casing head is being processed, the operator unfolds the adjustment plate to drive the protective cloth to be simultaneously unfolded. When the adjustment plate and the protective cloth are simultaneously unfolded, protection is provided on both sides of the tubing head or casing head during processing. BRIEF DESCRIPTION OF THE DRAWINGS

[0031] Figure 1 It is a schematic diagram of the front cross-sectional structure of the present invention;

[0032] Figure 2 This is a schematic diagram of the base installation structure of the present invention;

[0033] Figure 3 It is a schematic diagram of the base platform and the connecting plate structure of the present invention;

[0034] Figure 4 It is a partial cross-sectional structural schematic diagram of the base platform, the groove, the annular groove, the limiting hole, the convex circle and the connecting plate of the present invention;

[0035] Figure 5 This is a schematic diagram of the mounting frame, connecting pins, adjusting plate and concave block structure of the present invention;

[0036] Figure 6 For the present invention Figure 5 The enlarged structural diagram at A in the middle;

[0037] Figure 7 This is a schematic diagram of the structure of the connecting pin, the adjusting plate and the protective cloth of the present invention;

[0038] Figure 8 It is a schematic diagram of the concave block structure of the present invention;

[0039] Fig. 9 It is a schematic diagram of the structure of the mounting platform, iron bar, sliding groove, limit connecting hole, first through-hole plate, limit frame, sliding adjustment plate, T-shaped slider, V-shaped slider, through cylinder, connecting spring, through-hole adjustment plate, connecting rod, grip plate, limit plate, connecting column, threaded rod, second through-hole plate and pressing plate of the present invention;

[0040] Fig.10It is a schematic diagram of the structure of the sliding adjustment plate, the limiting groove and the guide groove of the present invention;

[0041] Fig.11 It is a schematic diagram of the structure of the magnetic guide block, the first through-hole plate and the limit frame of the present invention.

[0042] In the figure: 1. base installation structure; 101. base rotation component; 1011. base platform; 1012. groove; 1013. annular groove; 1014. limiting hole; 1015. convex circle; 1016. connecting plate; 102. adjusting protection component; 1021. mounting frame; 1022. hand wheel linear motor group; 1023. gear group; 1024. connecting pin; 1025. adjusting plate; 1026. protective cloth; 1027. concave block; 1028. chain; 2. protective positioning structure; 201. mounting platform; 202. guide groove; 203, iron bar; 204, sliding groove; 205, limiting connecting hole; 206, magnetic guide block; 207, first through-hole plate; 208, limiting frame; 209, sliding adjustment plate; 2010, limiting groove; 2011, T-shaped slider; 2012, V-shaped slider; 2013, through cylinder; 2014, connecting spring; 2015, through-hole adjustment plate; 2016, connecting rod; 2017, grip plate; 2018, limiting plate; 2019, connecting column; 2020, threaded rod; 2021, second through-hole plate; 2022, pressure plate. DETAILED DESCRIPTION

[0043] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. 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 creative work are within the scope of protection of the present invention.

[0044] See also Figure 1-11 The present invention provides a technical solution: a positioning fixture for processing a tubing head with a double protection structure, such as Figure 1 , Figure 2 , Figure 3 and Figure 4As shown, the base installation structure 1 includes a base rotation component 101 fixedly installed with an adjustment protection component 102, and the base rotation component 101 includes a base platform 1011 with a through hole and a groove 1012, and an annular groove 1013 connected to a limiting hole 1014 is provided inside the groove 1012, and the limiting hole 1014 and the annular groove 1013 are both connected to a connection plate 1016 with a convex circle 1015 fixed on the surface for adjustment and limitation, and the connection plate 1016 The bottom is connected to the bottom of the base 1011 through a connecting shaft and a bearing seat, and a mounting column for adjusting the mounting support of the protective assembly 102 is fixed on the connecting plate 1016, wherein the above-mentioned components constitute a rotation adjustment limit structure, and the rotation adjustment limit structure constituted by the above-mentioned components can effectively change the rotation adjustment angle of the connecting plate 1016, thereby synchronously changing the rotation processing angle of the tubing head or the casing head, thereby avoiding the need for reversing the tubing head or the casing head during processing.

[0045] In the above scheme, the operator installs the base platform 1011 above the machine tool and then hoists the oil pipe head to be processed above the base platform 1011 for installation and fixation to be processed.

[0046] like Figure 5 , Figure 6 , Figure 7 and Figure 8 As shown, the adjustment protection component 102 includes a mounting frame 1021 with a hollow structure inside, and the mounting frame 1021 is fixed on the connecting plate 1016 through a mounting column, and a handwheel linear motor group 1022 is rotatably installed inside the mounting frame 1021, and a gear group 1023 that meshes and adjusts with the chain 1028 is fixed at one end of the handwheel linear motor group 1022, wherein the handwheel linear motor group 1022 is provided with 1 group, and the handwheel linear motor group 1022 modifies the linear motor assembly in the prior art structure to perform relative interval adjustment of the components in the handwheel linear motor group 1022 manually instead of by motor drive, and by improving the linear motor group in the prior art to be manually driven, it is effectively avoided that the electric drive method is directly used for drive adjustment.

[0047] In the above scheme, connecting pins 1024 are fixed on both sides of the installation frame 1021, and the connecting pins 1024 are all rotatably connected through the adjustment plate 1025 with through holes at the bottom. At the same time, a rotatable and foldable protective cloth 1026 is installed on the surface of the adjustment plate 1025. The protective cloth 1026 is set to be a flexible transparent cloth, and the overall thickness range of the protective cloth 1026 is set to 0.3-0.5 cm. When the above-mentioned parts are set to be a flexible transparent cloth, it is not only convenient for the above-mentioned parts to be stored and folded, but also convenient for the above-mentioned parts to be quickly deployed for protection, and the above-mentioned parts are set to be flexible. When the transparent cloth is set, it can effectively intercept and protect both sides of the workpiece, and when the overall thickness range of the protective cloth 1026 is set to 0.5 cm, it can not only avoid the overall thickness of the above-mentioned components being too thick, thereby affecting the normal folding and storage of the above-mentioned components, but also fixed with threaded recessed blocks 1027 on both sides of the surface of the mounting frame 1021, and the surface of the recessed blocks 1027 is installed with rotating nuts for adjusting the extrusion limit of the adjustment plate 1025, wherein the above-mentioned components constitute a rotating unfolding structure, and the rotating unfolding structure constituted by the above-mentioned components can effectively provide unfolding protection for both sides of the workpiece.

[0048] Fig. 9 , Fig.10 and Fig.11 As shown, a protective positioning structure 2 is fixed on the base mounting structure 1, and the protective positioning structure 2 includes a mounting table 201 for sliding adjustment with the handwheel linear motor group 1022 parts, and a guide groove 202 is opened on the surface of the mounting table 201, and an iron bar 203 is laid inside the guide groove 202, and a sliding groove 204 is opened on the surface of the mounting table 201, and a limit connecting hole 205 for connecting and limiting is opened on the surface of the sliding groove 204, wherein 4 groups of 8 guide grooves 202 and sliding grooves 204 are opened on both sides of the mounting table 201. When multiple groups of the above structure are opened, the second through-hole plate 2021 can be effectively adjusted for normal relative sliding.

[0049] The above scheme further comprises that the guide groove 202 is slidably connected to the magnetic guide block 206, and the magnetic guide block 206 is fixedly connected to one side of the first through-hole plate 207, and at the same time, a limit frame 208 for adjusting the limit by inserting into the limit connection hole 205 is movably installed on the surface of the first through-hole plate 207, and a sliding adjustment plate 209 which also has another guide groove 202 is fixed on the first through-hole plate 207, and a limit groove 2010 for connecting the limit is provided on the sliding adjustment plate 209, and at the same time, the sliding adjustment plate 209 is slidably connected to the V-shaped slider 2012 through the T-shaped slider 2011, wherein a plurality of limit grooves 2010 are provided on the sliding adjustment plate 209, and the plurality of limit grooves 2010 are used to effectively limit the sliding of the single V-shaped slider 2012, and the above also constitutes a sliding adjustment structure, and the sliding adjustment structure constituted by the above components is used to effectively change the sliding adjustment interval distance of the single V-shaped slider 2012.

[0050] In the above scheme, a through cylinder 2013 with a hollow structure is fixed to the rear side of the V-shaped slider 2012, and the upper part of the through cylinder 2013 is fixedly connected to one end of the connecting spring 2014, and the other end of the connecting spring 2014 is fixedly connected to one side of the through hole adjustment plate 2015. A connecting rod 2016 extending from both ends of the through cylinder 2013 and passing through and fixed to the through hole adjustment plate 2015 is provided in the through cylinder 2013, one end of the connecting rod 2016 is fixedly connected to the grip plate 2017, and the other end of the connecting rod 2016 is fixedly connected to the limit plate 2018, and one side of the first through hole plate 207 is connected to the connecting column 2018 through the fixing plate. 019 is fixedly connected on one side, and a threaded rod 2020 is fixed on the connecting column 2019, and at the same time, the threaded rod 2020 passes through the second through-hole plate 2021 and is threadedly connected to the nut, and the inner side of the connecting column 2019 is also fixedly connected to the handwheel linear motor group 1022 components through a fixed plate, wherein the above-mentioned components constitute a pulling elastic adjustment structure setting, and the pulling elastic adjustment structure constituted by the above-mentioned components can effectively change the lifting adjustment interval distance of the limit plate 2018, and by changing the lifting adjustment interval distance of the limit plate 2018, it can effectively adjust the limit effect of the adjusted separate V-shaped slider 2012.

[0051] Furthermore, in the above scheme, a pressure plate 2022 for limiting the installation of the tubing head or the casing head is fixed at the bottom of the second through-hole plate 2021, and the pressure plate 2022 is installed in the form of an "arc plate". When the above components are installed in the form of an "arc plate", the tubing head or the tubing head can be effectively fitted, squeezed, limited, fixed and protected.

[0052] In the above scheme, after the operator hoists the tubing head above the base 1011, the operator adjusts the handwheel linear motor group 1022 to drive the connecting column 2019, the first through-hole plate 207 and the V-shaped slider 2012 to slide relative to each other. When the V-shaped slider 2012 slides the corresponding interval distance, the operator uses the limit frame 208 to penetrate the first through-hole plate 207 and connect it with the limit connection hole 205 to play a secondary adjustment limit for the first through-hole plate 207. The operator uses the grip plate 217 to pull the connecting rod 216 to drive the limit plate 218 and the limit groove 2010 to separate under force, thereby pushing the single V-shaped slider 2012 to slide and adjust. When the single V-shaped slider 2012 is adjusted to the corresponding position, the operator releases the grip plate 217. At this time, the limit plate 2018 and the limit groove 2010 are connected and limited to the single V-shaped slider 2012, which facilitates the placement of the two ends of the tubing head after adjusting the limit. Then the operator places The second through-hole plate 2021 and the pressure plate 2022 pass through the threaded rod 2020 so that the pressure plate 2022 is matched and connected to the surface of the tubing head or casing head. Then the operator uses the fixing nut to thread the threaded rod 2020 to install the second through-hole plate 2021 and then pulls and unfolds the adjustment plate 1025 to drive the protective cloth 1026 to be synchronously force-expanded. When the adjustment plate 1025 and the protective cloth 1026 are synchronously force-expanded, the two sides of the tubing head or casing head during the processing are protected. After one end of the tubing head or casing head is processed, the operator pushes the installation column to drive the connecting disk 1016 to rotate under force. When the connecting disk 1016 is rotated under force, it drives the convex circle 1015 to rotate and adjust relative to the limiting hole 1014 and the annular groove 1013. When the connecting disk 1016 is rotated and adjusted to the corresponding angular position, it synchronously drives the tubing head and the casing head to be synchronously force-rotated, which is convenient for the rotation and rotation processing of the tubing head and the casing head.

[0053] The directions or positional relationships indicated by terms such as "center", "longitudinal", "lateral", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside" and "outside" are based on the directions or positional relationships shown in the accompanying drawings. They are merely simplified descriptions for the convenience of describing the present invention, and do not indicate or imply that the devices or elements referred to must have a specific direction, be constructed and operated in a specific direction. Therefore, they should not be understood as limitations on the protection content of the present invention.

[0054] Although the present invention has been described in detail with reference to the aforementioned embodiments, it is still possible for those skilled in the art to modify the technical solutions described in the aforementioned embodiments, or to make equivalent substitutions for some of the technical features therein. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. A positioning fixture for processing a tubing head with a double protection structure, characterized in that: It comprises a base mounting structure (1), on which a protective positioning structure (2) is fixed; The base installation structure (1) comprises a base rotating assembly (101) on which an adjusting protection assembly (102) is fixedly installed, and the base rotating assembly (101) comprises a base platform (1011) with a through hole and a groove (1012), and an annular groove (1013) is provided inside the groove (1012) and is connected to the limiting hole (1014) for guiding. The limiting hole (1014) and the annular groove (1013) are both connected to a connection plate (1016) having a convex circle (1015) fixed on the surface for adjustment and limiting, and the bottom of the connection plate (1016) is connected to the bottom of the base platform (1011) through a connecting shaft and a bearing seat, and a mounting column for supporting the installation of the adjustment protection component (102) is fixed on the connection plate (1016); The adjustment protection component (102) comprises a mounting frame (1021) having a hollow structure inside, and the mounting frame (1021) is fixed to the connection plate (1016) via a mounting column, and a handwheel linear motor group (1022) is rotatably mounted inside the mounting frame (1021), and a gear group (1023) meshing and adjusting with a chain (1028) is fixed at one end of the handwheel linear motor group (1022); Connecting pins (1024) are fixed on both sides of the installation frame (1021), and the connecting pins (1024) all penetrate the adjusting plate (1025) with through holes at the bottom for rotational connection, and a rotatable and foldable protective cloth (1026) is installed on the surface of the adjusting plate (1025). Concave blocks (1027) with threaded holes are fixed on both sides of the surface of the installation frame (1021), and a rotating nut for adjusting the extrusion limit of the adjusting plate (1025) is installed on the surface of the concave blocks (1027); The protective positioning structure (2) comprises a mounting platform (201) for sliding adjustment with parts of a handwheel linear motor group (1022), and a guide groove (202) is provided on the surface of the mounting platform (201), and an iron bar (203) is laid inside the guide groove (202), and a sliding groove (204) is provided on the surface of the mounting platform (201), and a limit connection hole (205) for connecting a limit is provided on the surface of the sliding groove (204); The guide groove (202) is slidably connected to the magnetic guide block (206), and the magnetic guide block (206) is fixedly connected to one side of the first through-hole plate (207); a limit frame (208) inserted into the limit connection hole (205) for adjusting the limit is movably installed on the surface of the first through-hole plate (207); a sliding adjustment plate (209) also having another guide groove (202) is fixed on the first through-hole plate (207); a limit groove (2010) for connecting the limit is provided on the sliding adjustment plate (209); and the sliding adjustment plate (209) is slidably connected to the V-shaped slider (2012) via a T-shaped slider (2011); A through cylinder (2013) with a hollow structure inside is fixed to the rear side of the V-shaped slider (2012), and the upper part of the through cylinder (2013) is fixedly connected to one end of a connecting spring (2014), while the other end of the connecting spring (2014) is fixedly connected to one side of a through hole adjustment plate (2015), and a connecting rod (2016) extending from both ends of the through cylinder (2013) and penetrating and fixed to the through hole adjustment plate (2015) is provided in the through cylinder (2013); One end of the connecting rod (2016) is fixedly connected to the grip plate (2017), and the other end of the connecting rod (2016) is fixedly connected to the limit plate (2018); one side of the first through-hole plate (207) is fixedly connected to one side of the connecting column (2019) via a fixing plate, and a threaded rod (2020) is fixed on the connecting column (2019); the threaded rod (2020) passes through the second through-hole plate (221) and is threadedly connected to a nut; the inner side of the connecting column (2019) is also fixedly connected to the handwheel linear motor group (1022) components via a fixing plate; A pressing plate (2022) for limiting the installation of the tubing head or casing head is fixed to the bottom of the second through-hole plate (2021), and the pressing plate (2022) is installed in the form of an "arc-shaped plate".

2. The positioning fixture for processing a tubing head with a double protection structure according to claim 1 is characterized in that: The protective cloth (1026) is made of a flexible transparent cloth, and the overall thickness of the protective cloth (1026) is set in the range of 0.3-0.5 cm.

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