Large-drift-diameter oil and gas pipeline laser cutting numerical control machine tool

Abstract

The invention discloses a laser cutting numerical control machine tool for a large-drift-diameter oil and gas pipeline, and belongs to the technical field of pipeline cutting equipment. The laser cutting numerical control machine tool for the large-drift-diameter oil and gas pipeline comprises a numerical control machine tool body, a first guide rail and a second guide rail, the fixed tensioning device is arranged on the numerical control machine tool; the movable tensioning device is movably arranged on the first guide rail in the first direction, and the movable tensioning device and the fixed tensioning device are oppositely arranged in the first direction; the pipeline moving device is movably arranged on the first guide rail in the first direction; and the laser cutting assembly is movably arranged on the second guide rail in the first direction. The laser cutting numerical control machine tool for the large-drift-diameter oil and gas pipeline is high in automation degree and has ideal cutting precision and efficiency.

Description

Technical Field

[0001] The present application belongs to the technical field of pipeline cutting equipment, and in particular relates to a CNC machine tool for laser cutting of large-diameter oil and gas pipelines. Background Art

[0002] At present, in the maintenance and repair work of large-diameter long-distance oil and gas pipelines, the welding construction of replacing short sections mostly adopts automatic welding technology; because automatic welding has high requirements for pipe nozzle assembly, correspondingly, there are also higher requirements for the dimensional accuracy and surface finish of prefabricated pipe short sections.

[0003] In existing technology, prefabricated pipe nipples are typically cut and shaped using acetylene-oxygen flame or plasma cutting. Due to the large molten pool of these cutting methods, machining accuracy is relatively low. Furthermore, manual movement of the cutting head is required during the cutting process, which can increase machining errors. Furthermore, the long flame cutting and grinding times of prefabricated pipe nipples increase the difficulty of pipe end assembly and automated welding, reducing operational efficiency. Summary of the Invention

[0004] This application provides a CNC machine tool for laser cutting of large diameter oil and gas pipelines, which aims to at least to some extent solve the technical problems of unsatisfactory precision and efficiency in pipeline cutting operations.

[0005] In one aspect of an embodiment of the present application, a CNC machine tool for laser cutting of large-diameter oil and gas pipelines is provided, comprising:

[0006] A CNC machine tool is provided with a first guide rail and a second guide rail along a first direction;

[0007] A fixed tensioning device is provided on the CNC machine tool;

[0008] a movable tensioning device, movably disposed on the first guide rail along a first direction, and the movable tensioning device and the fixed tensioning device are disposed opposite to each other along the first direction;

[0009] a pipeline moving device, movably disposed on the first guide rail along the first direction;

[0010] The laser cutting assembly is movably disposed on the second guide rail along the first direction.

[0011] In some embodiments, the fixing and tensioning device comprises:

[0012] A fixed base is provided on the CNC machine tool;

[0013] A first rotating shell is rotatably disposed on the fixed base;

[0014] a plurality of first telescopic rods, disposed on the first rotating shell so as to be movable along the radial direction of the first rotating shell, and the plurality of first telescopic rods are spaced apart along the circumference of the first rotating shell;

[0015] The first pushing mechanism is connected to the first telescopic rod.

[0016] In some embodiments, the first pushing mechanism includes:

[0017] a first driving cylinder, disposed in the first rotating shell;

[0018] a first tensioning faceplate connected to an end of a piston rod of the first driving cylinder;

[0019] Two ends of the plurality of first connecting rods are respectively hinged to the first tensioning discs and the plurality of first telescopic rods.

[0020] In some embodiments, the fixing and tensioning device further comprises:

[0021] A driving motor is arranged on the fixed base;

[0022] a transmission gear set, connecting the drive motor and the first rotating shell respectively;

[0023] A first bearing is connected between the first rotating shell and the fixed base.

[0024] In some embodiments, the mobile tensioning device comprises:

[0025] a movable base, movably disposed on the first guide rail;

[0026] a second rotating shell rotatably disposed on the mobile base;

[0027] a plurality of second telescopic rods, disposed on the second rotating shell so as to be movable along the radial direction of the second rotating shell, and the plurality of second telescopic rods are spaced apart along the circumference of the second rotating shell;

[0028] The second pushing mechanism is connected to the second telescopic rod.

[0029] In some embodiments, the second pushing mechanism includes:

[0030] a second driving cylinder, disposed in the second rotating housing;

[0031] a second tensioning faceplate connected to an end of a piston rod of the second driving cylinder;

[0032] Two ends of the plurality of second connecting rods are respectively hinged to the second tensioning discs and the plurality of second telescopic rods.

[0033] In some embodiments, the mobile tensioning device further comprises:

[0034] a second driving motor, disposed on the mobile base;

[0035] The second transmission gear set is respectively connected to the second driving motor and the second rotating shell.

[0036] The second bearing is connected between the second rotating shell and the moving base.

[0037] In some embodiments, the pipeline moving device includes:

[0038] a movable frame, arranged on the first guide rail so as to be movable along the first direction;

[0039] The support roller is rotatable around the axis of the first direction and is arranged on the movable frame. There are two support rollers, and the two support rollers are symmetrically arranged along the second direction. The two support rollers can be relatively close to or away from each other along the second direction, and the second direction is orthogonal to the first direction.

[0040] In some embodiments, the laser cutting assembly includes:

[0041] a cutting frame movably disposed on the second guide rail;

[0042] The cutting laser is arranged on the cutting frame.

[0043] In some embodiments, the cutting frame comprises:

[0044] a frame, arranged on the second guide rail;

[0045] An X-axis driving module is connected between the frame and the second guide rail, and the X-axis direction is arranged along the first direction;

[0046] A Y-axis driving module is arranged on the frame, and the Y-axis direction is arranged along the second direction, and the second direction is orthogonal to the first direction;

[0047] A Z-axis driving module is arranged on the Y-axis driving module, and the Z-axis direction is arranged along the third direction, and the third direction is orthogonal to the first direction and the second direction;

[0048] The R-axis driving module is arranged on the Z-axis driving module, and the cutting laser is connected to the R-axis driving module.

[0049] The embodiments of the present application have at least the following beneficial effects:

[0050] The embodiment of the present application provides a CNC machine tool for laser cutting large-diameter oil and gas pipelines, comprising a CNC machine tool and a fixed tensioning device, a movable tensioning device, a pipeline moving device, and a laser cutting assembly thereon; the CNC machine tool is provided with a first guide rail and a second guide rail along a first direction; the movable tensioning device is movably provided on the first guide rail along the first direction, and the movable tensioning device and the fixed tensioning device are arranged relative to each other along the first direction, thereby flexibly clamping and tightening the two ends of the pipeline; the pipeline moving device is movably provided on the first guide rail along the first direction, thereby flexibly moving the pipeline; the laser cutting assembly is movably provided on the second guide rail along the first direction, thereby flexibly achieving cutting at a set position. It is worth noting that, through the CNC machine tool and the tensioning devices at the two pipe nozzles, the pipeline short section blanking system is CNC-controlled, which greatly improves the dimensional accuracy of the short section blanking for large-diameter pipeline maintenance and repair, and reduces the difficulty of subsequent pipe nozzle assembly and automatic welding; at the same time, the use of the laser cutting process improves the cutting quality and improves the processing efficiency to a certain extent. BRIEF DESCRIPTION OF THE DRAWINGS

[0051] In order to more clearly illustrate the technical solutions in the embodiments of the present application, a brief introduction will be given below to the drawings required for use in the description of the embodiments. Obviously, the drawings described below are some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without any creative work.

[0052] Figure 1 A schematic diagram of the three-dimensional structure of a CNC machine tool for laser cutting large-diameter oil and gas pipelines in an embodiment of the present application is shown;

[0053] Figure 2 Shown Figure 1 The main view of the CNC machine tool for laser cutting large-diameter oil and gas pipelines;

[0054] Figure 3 Shown Figure 1 Right view of the CNC machine tool for laser cutting large-diameter oil and gas pipelines;

[0055] Figure 4 Shown Figure 1 A cross-sectional view of the fixed tensioning device of a CNC machine tool for laser cutting large-diameter oil and gas pipelines;

[0056] Figure 5 Shown Figure 1 Cross-sectional view of the mobile tensioning device of a CNC machine tool for laser cutting of large-diameter oil and gas pipelines. DETAILED DESCRIPTION

[0057] The following will be combined with the drawings in the embodiments of this application to clearly and completely describe the technical solutions in the embodiments of this application. Obviously, the embodiments described are only part of the embodiments of this application, not all of the embodiments. Based on the embodiments in this application, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of this application.

[0058] In addition, this application may repeat reference numbers and / or reference letters in different examples. This repetition is for the purpose of simplicity and clarity and does not in itself indicate the relationship between the various embodiments and / or arrangements discussed. In addition, this application provides examples of various specific processes and materials, but those skilled in the art will recognize the application of other processes and / or the use of other materials.

[0059] The present application is described below with reference to specific embodiments and with reference to the accompanying drawings:

[0060] The prefabricated pipe short sections cut and formed using acetylene oxygen flame or plasma cutting processes have low processing accuracy and unsatisfactory pipe end quality, which to a certain extent increases the difficulty of subsequent pipe end assembly and automatic welding, and reduces operational efficiency.

[0061] To this end, an embodiment of the present application provides a large-diameter oil and gas pipeline laser cutting CNC machine tool, which aims to at least to some extent solve the technical problems of unsatisfactory accuracy and efficiency of pipeline cutting operations.

[0062] See also Figure 1 、 Figure 2 、 Figure 3 、 Figure 4 and Figure 5 In some embodiments, a CNC machine tool for laser cutting of large-diameter oil and gas pipelines includes: a CNC machine tool 1, a laser cutting assembly 2, a fixed tensioning device 3, a movable tensioning device 4, and a pipeline moving device 6.

[0063] The CNC machine tool 1 serves as the supporting and mounting base for other components, providing a stable support foundation for their operation, as well as the corresponding energy supply, communication, and control architecture. The CNC machine tool 1 is also equipped with on-site control equipment such as industrial computers to implement a unified control architecture for other functional components and provide control system support to achieve a certain degree of automated control.

[0064] At the same time, as a supporting base, the CNC machine tool 1 should be equipped with a mounting structure and a movable guide structure adapted to other components, that is, a first guide rail 11 and a second guide rail 12 are provided along the first direction X on the CNC machine tool 1 .

[0065] The fixing and tightening device 3 is provided on the CNC machine tool 1 and is used to clamp one end of the tightened pipe 7 to maintain the stability of the pipe shape, thereby ensuring the quality of the cutting surface.

[0066] The movable tensioning device 4 is used to secure the other end of the pipe 7 and cooperates with the fixed tensioning device 3 to ensure that the pipe 7 is stably secured in both the longitudinal and radial directions. The movable tensioning device 3 is movably disposed on the first guide rail 11 along a first direction X. The movable tensioning device 4 and the fixed tensioning device 3 are disposed opposite each other along the first direction X, thereby enabling flexible clamping according to the actual length of the pipe 7.

[0067] The pipeline moving device 6 is used to bear the weight of the pipeline 7 and move the pipeline 7 in the first direction X, so that both ends of the pipeline 7 can be conveniently clamped and secured with the fixed tensioning device 3 and the movable tensioning device 4. Considering that the fixed tensioning device 3 and the movable tensioning device 4 are arranged relative to each other in the first direction X, the pipeline moving device 6 is arranged on the first guide rail 11 so as to be movable in the first direction X.

[0068] The laser cutting assembly 2 is a functional structure that directly cuts the pipe 7. Laser cutting improves cutting efficiency and surface quality, facilitating subsequent pipe end alignment and welding. Accordingly, to flexibly select cutting positions and avoid interference with the pipe 7, the movable tensioning device 4, and the fixed tensioning device 3, the laser cutting assembly 2 is movably mounted on the second guide rail 12 along the first direction X.

[0069] Generally speaking, the laser cutting assembly 2, the fixed tensioning device 3 and the movable tensioning device 4 can cooperate in implementing tensioning and cutting operations in the coordinated control line of the industrial computer of the CNC machine tool 1, thereby improving the degree of automation, cutting quality and efficiency to a certain extent.

[0070] In some embodiments, the fixed tensioning device 3 is a fixed-position clamping and tensioning mechanism, which is provided on the CNC machine tool 1 and has a certain load-bearing capacity and the ability to rotate the pipeline 1 .

[0071] Specifically, the fixing and tensioning device 3 may include a fixing base 31 , a first rotating shell 32 , a plurality of first telescopic rods 39 and a first pushing mechanism 3 a .

[0072] The fixed base 31 is a load-bearing foundation, mounted on the CNC machine tool 1 and serving as a mounting base for other mating components. The first rotating housing 32 serves as a mounting base for the plurality of first telescopic rods 39 and is rotatably mounted on the fixed base 31. The plurality of first telescopic rods 39 are radially movable on the first rotating housing 32 and are spaced apart circumferentially around the first rotating housing 32. The first pushing mechanism 3a is connected to the first telescopic rods 39.

[0073] The first pushing mechanism 3 a can drive the plurality of first telescopic rods 39 to be pushed out of the first rotating shell 32 or to be retracted into the first rotating shell 32 .

[0074] During operation, the first rotating shell 32 can be extended into the pipe 7, and then the first pushing mechanism 3a drives the multiple first telescopic rods 39 to be pushed out of the first rotating shell 32 to press against the inner wall of the pipe 7, thereby tightening the pipe 7 and achieving clamping and fixing.

[0075] After completing the work, the first pushing mechanism 3 a drives the plurality of first telescopic rods 39 to retract into the first rotating shell 32 , releasing the tight state against the inner wall of the pipe 7 , thereby releasing the pipe 7 .

[0076] In some embodiments, the first pushing mechanism 3a may include a first driving cylinder 36, a first tensioning disc 37 and a plurality of first connecting rods 38; the first driving cylinder 36 is arranged in the first rotating shell 32; the first tensioning disc 37 is connected to the end of the piston rod of the first driving cylinder 36; the two ends of the plurality of first connecting rods 38 are respectively hinged to the first tensioning disc 37 and the plurality of first telescopic rods 39.

[0077] Therefore, when the piston rod of the first driving cylinder 36 is telescopically moved, the first tensioning disc 37 is driven to move along a straight line trajectory, and the multiple first connecting rods 38 and the multiple first telescopic rods 39 are synchronously pulled to move in sequence, thereby tightening the pipe 7 or releasing the tension of the pipe 7.

[0078] In some embodiments, to achieve automated rotation of the first rotating shell 32, the fixed tensioning device 3 further includes a drive motor 35, a transmission gear set 34, and a first bearing 33. The first bearing 33 is connected between the first rotating shell 32 and the fixed base 31. The drive motor 35 is disposed on the fixed base 31, and the transmission gear set 34 is connected between the first rotating shell 32 and the drive motor 35. Thus, the drive motor 35 can drive the first rotating shell 32 to rotate, thereby synchronously driving the pipe 7 to rotate.

[0079] Among them, one gear in the transmission gear set 34 can be sleeved on the first rotating shell 32, one gear is connected to the output shaft of the driving motor 35, and the remaining gears are connected between the above two gears.

[0080] In some embodiments, the movable tensioning device 4 is a position-variable clamping tensioning mechanism, which is provided on the CNC machine tool 1 and has a certain load-bearing capacity and the ability to rotate the pipeline 1 .

[0081] Specifically, the mobile tensioning device 4 may include a mobile base 41 , a second rotating shell 42 , a plurality of second telescopic rods 49 and a second pushing mechanism 4 a .

[0082] The mobile base 41 is a load-bearing foundation, mounted on the CNC machine tool 1 and serving as a mounting base for other mating components. The second rotating housing 42 serves as a mounting base for the plurality of second telescopic rods 49 and is rotatably mounted on the mobile base 41. The plurality of second telescopic rods 49 are movably mounted on the second rotating housing 42 along its radial direction and are spaced apart circumferentially. The second pushing mechanism 4a is connected to the second telescopic rods 49.

[0083] The second pushing mechanism 4 a can drive the plurality of second telescopic rods 49 to be pushed out of the second rotating shell 42 or to be retracted into the second rotating shell 42 .

[0084] During operation, the second rotating shell 42 can be extended into the pipe 7, and then the second pushing mechanism 4a drives the plurality of second telescopic rods 49 to push out of the second rotating shell 42, pressing against the inner wall of the pipe 7, thereby tightening the pipe 7 and achieving clamping and fixing.

[0085] After completing the work, the second pushing mechanism 4 a drives the plurality of second telescopic rods 49 to retract into the second rotating shell 42 , releasing the tight state against the inner wall of the pipe 7 , thereby releasing the pipe 7 .

[0086] In some embodiments, the second pushing mechanism 4a may include a second driving cylinder 444, a second tensioning disc 45 and a plurality of second connecting rods 46; the second driving cylinder 44 is arranged in the second rotating shell 42; the second tensioning disc 45 is connected to the end of the piston rod of the second driving cylinder 44; the two ends of the plurality of second connecting rods 46 are respectively hinged to the second tensioning disc 45 and the plurality of second telescopic rods 47.

[0087] Therefore, when the piston rod of the second driving cylinder 44 is telescopically moved, the second tensioning disc 45 will be driven to move along a straight line trajectory, and the multiple second connecting rods 46 and the multiple second telescopic rods 47 will be pulled in sequence synchronously to move, thereby tightening the pipe 7 or contacting the tightened state of the pipe 7.

[0088] In some embodiments, in order to realize the rotation of the second rotating shell 42 , the movable tensioning device 4 further includes a second bearing 43 . The second bearing 43 is connected between the second rotating shell 42 and the movable base 41 .

[0089] In some embodiments, the first driving cylinder 36 and the second driving cylinder 44 may be hydraulic cylinders. Accordingly, a hydraulic station 5 may be configured on the CNC machine tool 1 to provide driving force for the first driving cylinder 36 and the second driving cylinder 44 .

[0090] Considering that the first drive cylinder 36 and the second drive cylinder 44 rotate respectively following the first rotating shell 32 and the second rotating shell 42, and the hydraulic station 5 is a stationary part, a first hydraulic rotary joint 310 and a second hydraulic rotary joint 48 can be connected between the hydraulic station 5 and the first drive cylinder 36 and the second drive cylinder 44, respectively, to maintain a stable oil supply circuit.

[0091] In some embodiments, the first telescopic rod 39 and the second telescopic rod 47 can be configured as expansion shoes, which together with the first connecting rod 38 and the second connecting rod 46 form a connecting rod-expansion shoe tensioning mechanism.

[0092] In some embodiments, the pipeline moving device 6 may include: a moving frame 61 and a support roller 62; the moving frame 61 is movably arranged on the first guide rail 11 along the first direction X; the support roller 62 can be rotatably arranged on the moving frame 61 around the axis of the first direction X, and there are two support rollers 62, and the two support rollers 62 are symmetrically arranged along the second direction Y, and the two support rollers 62 can be relatively close to or away from each other along the second direction Y, and the second direction Y is orthogonal to the first direction X.

[0093] That is, the pipeline 7 can be placed between the two supporting rollers 62 . Of course, the axial direction of the pipeline 7 is set along the first direction X. The two supporting rollers 62 adaptively rotate to stably support the pipeline 7 .

[0094] At the same time, the two support rollers 62 can also be relatively close to or far away from each other to adjust the support position with respect to the pipe 7 , thereby adapting to pipes 7 of different specifications, adjusting the support height, and ensuring the straightness of the pipe 7 .

[0095] Generally speaking, a tightening screw is provided on the moving member, which can be rotated to press against the first rail 11 , thereby locking the moving member 61 .

[0096] In some embodiments, the laser cutting assembly 2 includes: a cutting bracket 2a and a cutting laser 26; the cutting frame 2a is movably set on the second guide rail 12; the cutting laser 26 is set on the cutting frame 2a; so that the cutting laser 26 can be carried by the cutting bracket 2a to move along the first direction X.

[0097] In some embodiments, the cutting frame 2a includes a frame 21, an X-axis drive module 22, a Y-axis drive module 23, a Z-axis drive module 24, and an R-axis drive module 25. The frame 21 is arranged on the second guide rail 12; the X-axis drive module 22 is connected between the frame 21 and the second guide rail 12, and the X-axis direction is arranged along the first direction; the Y-axis drive module 23 is arranged on the frame 21, and the Y-axis direction is arranged along the second direction Y, which is orthogonal to the first direction; the Z-axis drive module 24 is arranged on the Y-axis drive module 23, and the Z-axis direction is arranged along the third direction, which is orthogonal to the first direction and the second direction; the R-axis drive module 25 is arranged on the Z-axis drive module 24, and the cutting laser 26 is connected to the R-axis drive module 25.

[0098] That is, the cutting frame 2a can move in the orthogonal first direction, second direction and third direction respectively to adjust the laser cutting position; and the laser cutting angle can be adjusted by using the R-axis driving module 25.

[0099] Before using the equipment, the spacing between the support rollers 62 in the two sets of pipe moving devices 6 on the CNC lathe 1 is adjusted to the scale that matches the diameter of the pipe 7. Then, the pipe 7 to be cut is hoisted and placed on the pipe moving device 6. The pipe 7 is moved along the first guide rail 11 toward the side of the fixed tensioning device 3 until the first telescopic rod 39 in the fixed tensioning device 3 enters the pipe end of the pipe 7 and locks the position of the pipe moving device 6.

[0100] Thereafter, the movable tensioning device 4 is moved toward the pipeline 7 until the second telescopic rod 47 of the movable tensioning device 4 enters the interior of the two side pipe ends of the pipeline 7 .

[0101] Start the hydraulic station 5 and simultaneously drive the piston rods of the first drive cylinder 36 in the fixed tensioning device 3 and the second drive cylinder 44 of the movable tensioning device 4 to be ejected; at this time, the first tensioning disc 37 at the end of the first drive cylinder 36 drives the multiple first tensioning connecting rods 38, pushes the multiple first telescopic rods 39 to extend radially outward along the pipeline, and tightens the inner circular surface of the pipeline 7; at the same time, the second tensioning disc 45 at the end of the second drive cylinder 44 drives the second tensioning connecting rod 46, pushes the multiple second telescopic rods 47 to extend radially outward along the pipeline, and tightens the inner circular surface of the pipeline workpiece, completing the clamping of the pipeline 7.

[0102] The X-axis drive module 22, the Y-axis drive module 23, the Z-axis drive module 24 and the R-axis drive module 25 in the laser cutting assembly 2 are operated to adjust the spatial position and angle of the laser cutter 26 at the end of the laser cutting assembly 2 and complete CNC cutting programming.

[0103] When performing the cutting operation, the drive motor 35 is started, and the drive motor 35 drives the fixed-end rotating shell 32 to rotate through the transmission gear set 34, and then drives the second rotating shell 42 in the mobile tensioning device 4 to rotate through the pipe 7. After that, the drive motor 35, the X-axis drive module 22, the Y-axis drive module 23, the Z-axis drive module 24, and the R-axis drive module 25 are numerically controlled using multi-axis linkage control to complete the laser cutting of the bevel at one end of the pipe 7; the X-axis drive module 22 is operated to move the laser cutting assembly 2 to the other end of the pipe 7, and the above operation is repeated to complete the laser cutting of the bevel at the other end of the pipe 7.

[0104] After the cutting is completed, the axes of the laser cutting assembly 2 are reset, the piston rods of the first drive cylinder 36 and the second drive cylinder 44 in the fixed tensioning device 3 and the movable tensioning device 4 are retracted, driving the first tensioning shoe 39 and the second tensioning shoe 47 to reset and release the pipe 7, then the movable tensioning device 4 is separated from the pipe 7, the pipe moving device 6 is moved, the pipe 7 is separated from the fixed tensioning device 3, and then the cut pipe 7 is lifted off the equipment to complete a working cycle.

[0105] The embodiments of the present application have at least the following beneficial effects:

[0106] The embodiment of the present application provides a CNC machine tool for laser cutting large-diameter oil and gas pipelines, comprising a CNC machine tool and a fixed tensioning device, a movable tensioning device, a pipeline moving device, and a laser cutting assembly thereon; the CNC machine tool is provided with a first guide rail and a second guide rail along a first direction; the movable tensioning device is movably provided on the first guide rail along the first direction, and the movable tensioning device and the fixed tensioning device are arranged relative to each other along the first direction, thereby flexibly clamping and tightening the two ends of the pipeline; the pipeline moving device is movably provided on the first guide rail along the first direction, thereby flexibly moving the pipeline; the laser cutting assembly is movably provided on the second guide rail along the first direction, thereby flexibly achieving cutting at a set position. It is worth noting that, through the CNC machine tool and the tensioning devices at the two pipe nozzles, the pipeline short section blanking system is CNC-controlled, which greatly improves the dimensional accuracy of the short section blanking for large-diameter pipeline maintenance and repair, and reduces the difficulty of subsequent pipe nozzle assembly and automatic welding; at the same time, the use of the laser cutting process improves the cutting quality and improves the processing efficiency to a certain extent.

[0107] In this application, unless otherwise expressly specified or limited, a first feature being "above" or "below" a second feature may include the first and second features being in direct contact, or may include the first and second features being in contact not directly but through another feature between them. Moreover, a first feature being "above," "above," and "above" a second feature may include the first feature being directly above or obliquely above the second feature, or may simply mean that the first feature is higher in level than the second feature. A first feature being "below," "below," and "below" a second feature may include the first feature being directly below or obliquely below the second feature, or may simply mean that the first feature is lower in level than the second feature.

[0108] In the description of the present application, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise" and "counterclockwise" indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present application.

[0109] It should be noted that all directional indications in the embodiments of the present application are only used to explain the relative position relationship, movement status, etc. between the components in a certain specific posture. If the specific posture changes, the directional indication will also change accordingly.

[0110] In this application, unless otherwise specified or limited, the terms "connection" and "fixation" should be understood in a broad sense. For example, "fixation" can mean fixed connection, detachable connection, or integration; mechanical connection or electrical connection; direct connection or indirect connection through an intermediate medium; internal communication between two elements or interaction between two elements, unless otherwise specified. For those skilled in the art, the specific meanings of the above terms in this application can be understood according to specific circumstances.

[0111] In addition, the terms "first," "second," and so on, used in this application are for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Therefore, a feature specified as "first" or "second" may explicitly or implicitly include one or more of the features. In the description of this application, "plurality" means two or more, unless otherwise specifically defined.

[0112] In the description of this specification, the reference terms "one embodiment", "some embodiments", "example", "specific example", or "some examples" mean that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present application. In this specification, the schematic representations of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described can be combined in any one or more embodiments or examples in a suitable manner. In addition, those skilled in the art can combine and combine different embodiments or examples described in this specification.

[0113] In addition, the technical solutions between the various embodiments can be combined with each other, but they must be based on the fact that ordinary technicians in this field can implement them. When the combination of technical solutions is mutually contradictory or cannot be implemented, it should be deemed that such a combination of technical solutions does not exist and is not within the scope of protection required by this application.

[0114] Although the embodiments of the present application have been shown and described, those skilled in the art will appreciate that various changes, modifications, substitutions, and variations may be made to the embodiments without departing from the principles and intent of the present application, and that the scope of the present application is defined by the claims and their equivalents.

Claims

1. A CNC machine tool for laser cutting of large diameter oil and gas pipelines, characterized in that: include: A CNC machine tool is provided with a first guide rail and a second guide rail along a first direction; A fixed tensioning device is provided on the CNC machine tool; a movable tensioning device, movably disposed on the first guide rail along a first direction, and the movable tensioning device and the fixed tensioning device are disposed opposite to each other along the first direction; a pipeline moving device, movably disposed on the first guide rail along the first direction; The laser cutting assembly is movably disposed on the second guide rail along the first direction.

2. The large diameter oil and gas pipeline laser cutting CNC machine tool according to claim 1, characterized in that: The fixing and tensioning device comprises: A fixed base is provided on the CNC machine tool; A first rotating shell is rotatably disposed on the fixed base; a plurality of first telescopic rods, disposed on the first rotating shell so as to be movable along the radial direction of the first rotating shell, and the plurality of first telescopic rods are spaced apart along the circumference of the first rotating shell; The first pushing mechanism is connected to the first telescopic rod.

3. The large diameter oil and gas pipeline laser cutting CNC machine tool according to claim 2, characterized in that: The first pushing mechanism includes: a first driving cylinder, disposed in the first rotating shell; a first tensioning faceplate connected to an end of a piston rod of the first driving cylinder; Two ends of the plurality of first connecting rods are respectively hinged to the first tensioning discs and the plurality of first telescopic rods.

4. The large diameter oil and gas pipeline laser cutting CNC machine tool according to claim 2, characterized in that: The fixing and tensioning device further comprises: A driving motor is arranged on the fixed base; a transmission gear set, connecting the drive motor and the first rotating shell respectively; A first bearing is connected between the first rotating shell and the fixed base.

5. The large diameter oil and gas pipeline laser cutting CNC machine tool according to claim 1, characterized in that: The mobile tensioning device comprises: a movable base, movably disposed on the first guide rail; a second rotating shell rotatably disposed on the mobile base; a plurality of second telescopic rods, disposed on the second rotating shell so as to be movable along the radial direction of the second rotating shell, and the plurality of second telescopic rods are spaced apart along the circumference of the second rotating shell; The second pushing mechanism is connected to the second telescopic rod.

6. The large diameter oil and gas pipeline laser cutting CNC machine tool according to claim 5, characterized in that: The second pushing mechanism includes: a second driving cylinder, disposed in the second rotating housing; a second tensioning faceplate connected to an end of a piston rod of the second driving cylinder; Two ends of the plurality of second connecting rods are respectively hinged to the second tensioning discs and the plurality of second telescopic rods.

7. The large diameter oil and gas pipeline laser cutting CNC machine tool according to claim 1, characterized in that: The pipeline moving device comprises: a movable frame, arranged on the first guide rail so as to be movable along the first direction; The support roller is rotatable around the axis of the first direction and is arranged on the movable frame. There are two support rollers, and the two support rollers are symmetrically arranged along the second direction. The two support rollers can be relatively close to or away from each other along the second direction, and the second direction is orthogonal to the first direction.

8. The large diameter oil and gas pipeline laser cutting CNC machine tool according to claim 1, characterized in that: The first guide rails are two parallel rails.

9. The large diameter oil and gas pipeline laser cutting CNC machine tool according to claim 1, characterized in that: The laser cutting assembly comprises: a cutting frame movably disposed on the second guide rail; The cutting laser is arranged on the cutting frame.

10. The large diameter oil and gas pipeline laser cutting CNC machine tool according to claim 9, characterized in that: The cutting frame comprises: a frame, arranged on the second guide rail; An X-axis driving module is connected between the frame and the second guide rail, and the X-axis direction is arranged along the first direction; A Y-axis driving module is arranged on the frame, and the Y-axis direction is arranged along the second direction, and the second direction is orthogonal to the first direction; A Z-axis driving module is arranged on the Y-axis driving module, and the Z-axis direction is arranged along the third direction, and the third direction is orthogonal to the first direction and the second direction; The R-axis driving module is arranged on the Z-axis driving module, and the cutting laser is connected to the R-axis driving module.

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