Polishing treatment device for outer surface of oil and gas pipeline

Abstract

The invention relates to an oil and gas pipeline outer surface polishing treatment device which comprises a machine box, two pipe end fixers, a rotary driving mechanism, a movable frame, a polishing assembly, a pipeline supporting mechanism and a mechanical arm, the upper end of the machine box is open and provided with a box cover capable of being opened or closed, one pipe end fixer is arranged at one end of the machine box and penetrates through one end of the machine box, and the other pipe end fixer is arranged at the other end of the machine box. The rotary driving mechanism is in transmission connection with one pipe end fixer and is used for driving the pipe end fixer to rotate, the other pipe end fixer is arranged at the other end of the machine box and is arranged in the machine box through a movable frame rotationally connected with the pipe end fixer, the movable frame can move in the extending direction of the two ends of the machine box, and the two pipe end fixers are used for fixing the two ends of a pipeline respectively. The pipeline supporting mechanism is arranged in the machine box, the grinding assembly is installed on the inner side wall of the machine box, and the mechanical arm is arranged outside the machine box. The device has the advantages of being reasonable in structural design, capable of rapidly polishing the outer surface of the pipeline, low in labor input and low in cost.

Description

Technical Field

[0001] The present invention relates to the technical field of oil and gas pipeline grinding, and particularly to a device for grinding the outer surface of an oil and gas pipeline. Background Art

[0002] The oil and gas pipelines built in the early stage have entered the middle and late stages of service, and the probability of pipeline failure increases year by year. How to effectively take preventive measures to extend the service life of oil and gas pipelines is a hot issue in the research of the petroleum and petrochemical industries. It is particularly important to analyze the causes of failure for the pipelines that have failed.

[0003] As an important step in the failure analysis of oil and gas pipelines, the prediction of the remaining life of oil and gas pipelines and the evaluation technology of girth welds, the grinding treatment of the outer surface of oil and gas pipelines is the first step in the failure analysis. The quality of the pipeline surface grinding directly affects the failure analysis results. However, the grinding treatment of the outer surface of the pipeline often peels off the anti-corrosion layer through manual grinding to expose the metallic luster. Manual grinding often interferes with the wall thickness and failure of the pipeline, and generates a large amount of anti-corrosion layer debris and corrosion rust slag during the grinding process, endangering the physical health of the grinding personnel and polluting the environment. The grinding cycle is long, and the grinding effect is difficult to meet the requirements of pipeline failure evaluation.

[0004] Based on this, it is necessary to develop a mechanized and rapid grinding device to meet the current operation requirements for grinding oil and gas pipelines. Summary of the Invention

[0005] The technical problem to be solved by the present invention is to provide a device for grinding the outer surface of an oil and gas pipeline, which effectively overcomes the defects of the prior art.

[0006] The technical solution of the present invention for solving the above technical problem is as follows:

[0007] A device for polishing the outer surface of an oil and gas pipeline comprises a chassis, two pipe end fixers, a rotary drive mechanism, a mobile frame, a polishing assembly, a pipeline support mechanism and a mechanical arm. The upper end of the chassis is open and is provided with a case cover that can be opened or closed. One of the pipe end fixers is arranged at one end of the chassis and passes through the one end of the chassis. The rotary drive mechanism is transmission-connected to one of the pipe end fixers for driving the rotation thereof. The other pipe end fixer is arranged at the other end of the chassis and is mounted inside the chassis through the mobile frame rotationally connected thereto. The mobile frame can move along the extending direction of the two ends of the chassis. The two pipe end fixers are used to fix the two ends of the pipeline respectively. The pipeline support mechanism is arranged inside the chassis and is located below between the two pipe end fixers for supporting the pipeline. The polishing assembly is installed on the inner side wall of the chassis for polishing the outer surface of the pipeline. The mechanical arm is arranged outside the chassis for grabbing the pipeline and placing it on the pipeline support mechanism inside the chassis, or grabbing and taking out the pipeline placed on the pipeline support mechanism.

[0008] Based on the above technical solution, the present invention can also be improved as follows.

[0009] Furthermore, the pipe end fixer comprises an inner ring, a connecting shaft and a plurality of arc-shaped clamping blocks, one end of the connecting shaft is coaxially connected to one end of the inner ring via a connecting frame, the plurality of clamping blocks are arranged at intervals along the circumferential direction and coaxially distributed on the periphery of the inner ring, the inner ring is radially threaded with a plurality of adjusting screws passing through it, and the plurality of adjusting screws are movably connected to the plurality of clamping blocks in a one-to-one corresponding manner.

[0010] Furthermore, the above-mentioned rotation drive mechanism includes a motor, a support frame and a drive shaft. The above-mentioned support frame is installed on the outside of one end of the above-mentioned chassis. The above-mentioned drive shaft is horizontally arranged and rotatably mounted on the upper end of the above-mentioned support frame. One end of the above-mentioned drive shaft is coaxially connected to the connecting shaft of one of the above-mentioned pipe end fixers. The motor shaft of the above-mentioned motor and the other end of the above-mentioned drive shaft are respectively coaxially equipped with pulleys, and belts are wrapped around the two above-mentioned pulleys.

[0011] Furthermore, a horizontally arranged and hollowed carrier frame is provided at the lower end of the chassis, the movable frame is mounted on the upper part of the other end of the carrier frame and can move horizontally along the carrier frame, and the pipeline support mechanism is mounted on the carrier frame.

[0012] Furthermore, a funnel-shaped bottom wall is provided at the lower end of the interior of the chassis corresponding to the portion below the carrier frame, an ash receiving port is provided in the middle of the bottom wall, an ash receiving box is provided below the ash receiving port, and an opening for the ash receiving box to enter and exit is provided at the lower portion of one side of the chassis.

[0013] Further, on both sides of the upper end of the above carrier frame, there is respectively a track extending horizontally towards both ends of the above chassis. The lower ends of the above moving frames are respectively slidably mounted on the above tracks. At the other end of the above carrier frame, there is a first hydraulic telescopic device connected to the above moving frame.

[0014] Further, the above pipeline support mechanism includes two groups of first linear moving devices, a carrier beam, multiple groups of hydraulic lifting devices, and multiple arc-shaped support members. The two groups of the above first linear moving devices are respectively mounted on the upper parts of both ends of the above carrier frame. The above carrier beam is horizontally mounted on the two groups of the above first linear moving devices. Multiple groups of the above hydraulic lifting devices are respectively distributed at intervals along the horizontal direction between the two ends of the above chassis and are fixed to the upper end of the above carrier beam. Multiple of the above support members are respectively mounted on the upper ends of multiple groups of the above hydraulic lifting devices. The two groups of the above first linear moving devices are used to synchronously drive the above carrier beam to horizontally move between the two sides of the above chassis.

[0015] Further, the above grinding assembly includes a second linear moving device, a second hydraulic telescopic device, a connecting beam, and multiple electric grinding devices. The above second linear moving device is mounted on the inner side wall of the above chassis. The above second hydraulic telescopic device is mounted on one side of the above second linear moving device through a connecting frame. The above connecting beam is horizontally mounted on the telescopic end of the above second hydraulic telescopic device. Multiple of the above electric grinding devices are horizontally spaced along the two ends of the above chassis and are respectively mounted on one side of the above connecting beam.

[0016] Further, there are two groups of the above grinding assemblies, which are respectively mounted on the inner side walls of both sides of the above chassis.

[0017] The beneficial effects of the present invention are as follows: The structure is reasonably designed, effectively solving the problem of high fuel consumption rate of large-horsepower tractors, and the disassembly, installation, and maintenance are more convenient compared with the existing tractor structures. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 is a schematic structural diagram of the device for grinding and processing the outer surface of the oil and gas pipeline of the present invention;

[0019] Figure 2 is a top view of the structure of the grinding assembly inside the chassis of the device for grinding and processing the outer surface of the oil and gas pipeline of the present invention;

[0020] Figure 3 is a side view of the structure of the pipe end fixator of the device for grinding and processing the outer surface of the oil and gas pipeline of the present invention;

[0021] Figure 4 is a schematic structural diagram of the cooperation between the support member and the hydraulic lifting device of the device for grinding and processing the outer surface of the oil and gas pipeline of the present invention.

[0022] In the drawings, the list of components represented by each reference numeral is as follows:

[0023] 1. Chassis; 2. Pipe end holder; 3. Rotary drive mechanism; 4. Moving frame; 5. Grinding assembly; 6. Pipe support mechanism; 8. Pipe; 9. First hydraulic telescopic device; 11. Carrier frame; 12. Bottom wall; 19. Box cover; 21. Inner ring; 22. Connecting shaft; 23. Clamping block; 24. Adjusting screw; 31. Motor; 32. Support frame; 33. Drive shaft; 34. Pulley; 51. Second linear moving device; 52. Second hydraulic telescopic device; 53. Connecting beam; 54. Electric grinding device; 61. First linear moving device; 62. Carrier beam; 63. Hydraulic lifting device; 64. Support member; 111. Track. DETAILED DESCRIPTION

[0024] The principles and features of the present invention are described below in conjunction with the accompanying drawings. The examples given are only used to explain the present invention and are not used to limit the scope of the present invention.

[0025] Example: Figure 1 and 2 As shown, the oil and gas pipeline outer surface grinding processing device of this embodiment includes a chassis 1, two pipe end holders 2, a rotating drive mechanism 3, a mobile frame 4, a grinding assembly 5, a pipeline support mechanism 6 and a mechanical arm. The upper end of the above-mentioned chassis 1 is open and is provided with a box cover 19 that can be opened or closed. One of the above-mentioned pipe end holders 2 is arranged at one end of the above-mentioned chassis 1 and passes through one end of the above-mentioned chassis 1. The above-mentioned rotating drive mechanism 3 is transmission-connected with one of the above-mentioned pipe end holders 2 for driving the rotation thereof. The other one of the above-mentioned pipe end holders 2 is arranged at the other end of the above-mentioned chassis 1 and is rotated through the above-mentioned mobile frame 4 connected thereto. Installed inside the above-mentioned chassis 1, the above-mentioned movable frame 4 can move along the extension direction of the two ends of the above-mentioned chassis 1, the two above-mentioned pipe end fixers 2 are used to fix the two ends of the pipe 8 respectively, the above-mentioned pipe support mechanism 6 is arranged inside the above-mentioned chassis 1, and is located below between the two above-mentioned pipe end fixers 2, and is used to support the pipe. The above-mentioned grinding assembly 5 is installed on the inner wall of the above-mentioned chassis 1, and is used to grind the outer surface of the pipe 8. The above-mentioned mechanical arm is arranged outside the above-mentioned chassis 1, and is used to grab the pipe and place it on the pipe support mechanism 6 inside the above-mentioned chassis 1, or grab and take out the pipe 8 placed on the above-mentioned pipe support mechanism 6.

[0026] The usage process is as follows:

[0027] Open the box cover 19, grab a pipe 8 from outside the chassis 1 by the robotic arm and place it at the upper end of the pipe support mechanism 6 inside the chassis 1 (pre-adjust the orientation and height of the pipe support mechanism 6). Next, adjust the position of the moving frame 4 according to the pipe length so that the two pipe end fixators 2 are respectively located at both ends of the pipe 8. Then, fix the two pipe end fixators 2 to both ends of the pipe 8. After that, the pipe support mechanism 6 moves back to its original position and leaves the pipe 8. Close the box cover 19, start the rotation drive mechanism 3 to drive the pipe 8 to rotate, and at the same time, use the grinding assembly 5 to approach the pipe 8 to grind the surface of the pipe 8. The overall device has a reasonable structural design, adopts mechanical grinding, the grinding process is completed inside the chassis, has little environmental pollution, can quickly grind the outer surface of the pipe, requires less manual input and has a low cost.

[0028] As a preferred embodiment, as Figure 1 and 3 shown, the above-mentioned pipe end fixator 2 includes an inner ring 21, a connecting shaft 22 and a plurality of arc-shaped clamping blocks 23. One end of the above-mentioned connecting shaft 22 is coaxially connected to one end of the above-mentioned inner ring 21 through a connecting frame. The plurality of above-mentioned clamping blocks 23 are arranged at intervals along the circumferential direction and are coaxially distributed on the periphery of the above-mentioned inner ring 21. A plurality of adjusting screws 24 are threadedly connected to the above-mentioned inner ring 21 along the radial direction and penetrate through it. The plurality of above-mentioned adjusting screws 24 are movably connected to the plurality of above-mentioned clamping blocks 23 in a one-to-one correspondence.

[0029] In the above-mentioned implementation scheme, the port of the pipe 8 is sleeved outside the inner ring 21, and the plurality of clamping blocks 23 are located inside the pipe 8. Then, turn the plurality of adjusting screws 24 until each clamping block 23 radially moves outward to abut against the inner side of the pipe 8. During the adjustment process, ensure that the pipe 8 is coaxial with the inner ring 21. After the clamping block 23 tightly abuts against the inner side of the pipe 8, the pipe 8 is completed to be clamped and fixed from the inside. Next, start the rotation drive mechanism 3 to drive the pipe 8 to rotate.

[0030] It should be emphasized that: an inspection opening is provided at one end of the chassis 1 corresponding to the pipe end fixator 2. The pipe end fixator 2 passes through this inspection opening. At the same time, an inspection door for workers to enter and exit is provided at the other end of the chassis 1, and workers can enter the inside of the chassis 1 to operate the pipe end fixator 2 to clamp the pipe.

[0031] As a preferred embodiment, the above-mentioned rotation drive mechanism 3 includes a motor 31, a support frame 32 and a drive shaft 33. The above-mentioned support frame 32 is installed outside one end of the above-mentioned chassis 1. The above-mentioned drive shaft 33 is horizontally arranged and is rotatably installed at the upper end of the above-mentioned support frame 32. One end of the above-mentioned drive shaft 33 is coaxially connected to the connecting shaft 22 of one of the above-mentioned pipe end fixators 2. The motor shaft of the above-mentioned motor 31 and the other end of the above-mentioned drive shaft 33 are respectively coaxially equipped with belt pulleys 34, and a belt is sleeved around the two above-mentioned belt pulleys 34.

[0032] In the above-described embodiment, the motor 31 drives the drive shaft 33 to rotate, which can drive the pulley 34 and the belt to rotate, thereby realizing the rotation of the connecting shaft 22 and ultimately realizing the rotation of the pipe end fixator 2. The connecting shaft 22 of the pipe end fixator 2 at the other end of the chassis 1 is installed on the upper end of the moving frame 4 through a bearing seat. Of course, a speed reducer can also be configured for the motor 31. The motor 31 is connected to the speed reducer, and the speed reducer is then connected to the drive shaft 33.

[0033] In this embodiment, a horizontally arranged and hollowed carrier frame 11 is provided at the lower end inside the above-mentioned chassis 1. The above-mentioned moving frame 4 is installed on the upper part of the other end of the above-mentioned carrier frame 11 and can move horizontally along the above-mentioned carrier frame 11. The above-mentioned pipe support mechanism 6 is installed on the above-mentioned carrier frame 11. The hollowed carrier frame 11 can reduce consumables. At the same time, the dust generated by grinding can fall downward through the carrier frame 11.

[0034] As a preferred embodiment, a funnel-shaped bottom wall 12 is provided at the lower end inside the above-mentioned chassis 1 corresponding to the part below the above-mentioned carrier frame 11. A dust receiving port is provided in the middle of the above-mentioned bottom wall 12. A dust receiving box 13 is provided below the above-mentioned dust receiving port. An opening for the above-mentioned dust receiving box 13 to enter and exit is provided at the lower part of one side of the above-mentioned chassis 1.

[0035] In the above-described embodiment, the debris generated by grinding is collected through the funnel-shaped bottom wall 12 provided below the carrier frame 11, and then falls into the dust receiving box 13 below through the dust receiving port. When the amount of dust received is relatively large, the dust receiving box 13 is taken out from the opening at the side end of the chassis 1 to collect the debris, that is, to realize the timely collection of the processed waste materials and avoid the environmental pollution and harm to the operators caused by the generated waste substances.

[0036] Of course, a vibrator can be provided at the lower end of the bottom wall 12 to vibrate the bottom wall 12 so that the debris accumulated on the upper surface of the bottom wall 12 can smoothly slide into the dust receiving port.

[0037] As a preferred embodiment, a track 111 extending horizontally towards both ends of the above-mentioned chassis 1 is provided on each side of the upper end of the above-mentioned carrier frame 11. The lower ends of the above-mentioned moving frame 4 are respectively slidably installed on the above-mentioned track 111. A first hydraulic telescopic device 9 connected to the above-mentioned moving frame 4 is provided at the other end of the above-mentioned carrier frame 11.

[0038] In the above-described embodiment, the first hydraulic telescopic device 9 pushes the moving frame 4 to translate along the two tracks 111, so that another pipe end fixator 2 can be translated closer to or away from one of the pipe end fixators 2, thereby achieving the purpose of adjusting the distance according to the length of different pipes 8. Among them, the first hydraulic telescopic device 9 can use a conventional hydraulic cylinder, and the number can be configured as one or more according to actual needs, and the telescopic direction extends along the extending direction of both ends of the chassis 1.

[0039] As a preferred embodiment, as Figure 1 and 4 shown, the above-mentioned pipe support mechanism 6 includes two groups of first linear movement devices 61, a carrier beam 62, multiple groups of hydraulic lifting devices 63 and multiple arc-shaped support members 64. The two groups of the first linear movement devices 61 are respectively installed on the upper parts of both ends of the above-mentioned carrier frame 11. The carrier beam 62 is horizontally installed on the two groups of the first linear movement devices 61. The multiple groups of the hydraulic lifting devices 63 are respectively distributed at intervals in the horizontal direction between both ends of the above-mentioned chassis 1 and are fixed to the upper end of the carrier beam 62. The multiple support members 64 are respectively installed on the upper ends of the multiple groups of the hydraulic lifting devices 63 one by one. The two groups of the first linear movement devices 61 are used to synchronously drive the carrier beam 62 to horizontally move between both sides of the chassis 1.

[0040] In the above-mentioned implementation, the first linear movement device 61 can drive the carrier beam 62 to move towards both sides of the chassis 1. At the same time, the multiple groups of hydraulic lifting devices 63 can respectively adjust the heights of the corresponding support members 64, so that the heights of the multiple support members 64 are exactly such that the pipe 8 and the pipe end holders 2 at both ends are aligned, facilitating the positioning, clamping and fixing of the pipe 8.

[0041] It should be noted that: The first linear movement device 61 can adopt an existing electric linear module or a power-equipped lead screw transmission pair to achieve the linear translation of the carrier beam 62. The hydraulic lifting device 63 can adopt an electric hydraulic jack. Both belong to products of the existing technology, and the specific models can be flexibly adapted according to actual needs and will not be elaborated here.

[0042] As a preferred embodiment, the above-mentioned grinding assembly 5 includes a second linear movement device 51, a second hydraulic telescopic device 52, a connecting beam 53 and multiple electric grinding devices 54. The second linear movement device 51 is installed on the inner side wall of the above-mentioned chassis 1. The second hydraulic telescopic device 52 is installed on one side of the second linear movement device 51 through a connecting frame. The connecting beam 53 is horizontally installed on the telescopic end of the second hydraulic telescopic device 52. The multiple electric grinding devices 54 are horizontally distributed at intervals along both ends of the above-mentioned chassis 1 and are respectively installed on one side of the connecting beam 53.

[0043] In the above embodiments, the second linear moving device 51 can drive the second hydraulic telescopic device 52, the connecting beam 53, and the plurality of electric grinding devices 54 to move along the long axis direction of the pipeline 8 (i.e., the extending direction at both ends of the chassis 1), so that the electric grinding devices 54 move relative to the long axis of the pipeline, realizing the moving (grinding) coverage of the outer surface of the pipeline 8. At the same time, the second hydraulic telescopic device 52 can drive the connecting beam 53 and the electric grinding devices 54 to translate along both sides of the chassis 1, realizing the approach or separation of the electric grinding devices 54 from the outer surface of the pipeline 8.

[0044] It should be noted that: The second linear moving device 51 can adopt an existing electric linear module or a power-equipped screw drive pair to realize the linear translation of the connecting beam 53. The second hydraulic telescopic device 52 can adopt a hydraulic cylinder to realize telescoping. The specific number can be flexibly configured as one or more according to actual needs. Both belong to products of the existing technology, and the specific models can be flexibly adapted according to actual needs, so no further details will be given here.

[0045] As a preferred embodiment, two sets of the above-mentioned grinding assemblies 5 are provided and are respectively installed on the inner walls of both sides of the above-mentioned chassis 1.

[0046] In the above embodiments, the two sets of grinding assemblies 5 are distributed on both sides of the pipeline 8. They can be started for grinding simultaneously, or only one of them can be started. When starting both sets, the electric grinding devices 54 of the two sets of grinding assemblies 5 can be staggered on both sides along the long axis direction of the pipeline 8 to realize a large-range grinding operation.

[0047] In this embodiment, the electric grinding device 54 belongs to the structure of the existing technology. Generally, it includes a driving motor and a grinding head. The grinding head can be a wire wheel or a grinding wheel, etc. The driving motor drives the grinding head to rotate to realize grinding.

[0048] It should be particularly emphasized that: In this embodiment, all the electric control components are connected to a controller to realize intelligent operation, and the hydraulic components are connected to a hydraulic station and can be controlled through a suitable hydraulic control system. Both the controller and the hydraulic control system belong to the existing technology, so no further details will be given here.

[0049] In the description of the present invention, it should be understood that the orientation or positional relationship indicated by the terms "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc. is based on the orientation or positional relationship shown in the drawings, and is only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be construed as a limitation on the present invention.

[0050] In addition, the terms "first" and "second" are only used for descriptive purposes and should not be construed as indicating or implying relative importance or implicitly specifying the quantity of the indicated technical features. Thus, features defined with "first" and "second" may explicitly or implicitly include at least one such feature. In the description of the present invention, the meaning of "a plurality of" is at least two, such as two, three, etc., unless otherwise specifically and clearly defined.

[0051] In the present invention, unless otherwise clearly specified and defined, the terms "mounted", "connected", "coupled", "fixed", etc. should be understood in a broad sense. For example, it may be a fixed connection, a detachable connection, or integrated; it may be a mechanical connection or an electrical connection; it may be directly connected or indirectly connected through an intermediate medium, and it may be the internal communication of two elements or the interaction relationship between two elements, unless otherwise clearly defined. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0052] In the present invention, unless otherwise clearly specified and defined, the first feature being "on" or "under" the second feature may be that the first and second features are in direct contact, or the first and second features are in indirect contact through an intermediate medium. Moreover, the first feature being "above", "over" and "on top of" the second feature may be that the first feature is directly above or obliquely above the second feature, or merely indicates that the first feature has a higher horizontal height than the second feature. The first feature being "under", "beneath" and "underneath" the second feature may be that the first feature is directly below or obliquely below the second feature, or merely indicates that the first feature has a lower horizontal height than the second feature.

[0053] In the description of this specification, the description with reference to terms such as "one embodiment", "some embodiments", "examples", "specific examples", or "some examples", etc. means that the specific features, structures, materials, or characteristics described in connection with the embodiment or example are included in at least one embodiment or example of the present invention. 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 may be combined in any one or more embodiments or examples in a suitable manner. In addition, without contradiction, those skilled in the art can combine and combine the different embodiments or examples described in this specification and the features of different embodiments or examples.

[0054] Although the embodiments of the present invention have been shown and described above, it can be understood that the above embodiments are exemplary and should not be construed as limiting the present invention. Those of ordinary skill in the art can make changes, modifications, substitutions, and variations to the above embodiments within the scope of the present invention.

Claims

1. An oil and gas pipeline outer surface grinding and processing device, characterized in that: It includes a chassis (1), two pipe end fixators (2), a rotary drive mechanism (3), a moving frame (4), a grinding assembly (5), a pipe support mechanism (6) and a robotic arm. The upper end of the chassis (1) is open and is provided with a lid (19) that can be opened or closed. One of the pipe end fixators (2) is arranged at one end of the chassis (1) and passes through one end of the chassis (1). The rotary drive mechanism (3) is in transmission connection with one of the pipe end fixators (2) to drive its rotation. The other pipe end fixator (2) is arranged at the other end of the chassis (1) and is installed inside the chassis (1) through the moving frame (4) rotatably connected thereto. The moving frame (4) can move along the extending direction of both ends of the chassis (1). The two pipe end fixators (2) are used to respectively fix both ends of a pipe (8). The pipe support mechanism (6) is arranged inside the chassis (1) and is located below and between the two pipe end fixators (2) to support the pipe. The grinding assembly (5) is installed on the inner side wall of the chassis (1) to grind the outer surface of the pipe. The robotic arm is arranged outside the chassis (1) to grab the pipe and place it on the pipe support mechanism (6) inside the chassis (1), or grab and take out the pipe (8) placed on the pipe support mechanism (6).

2. The oil and gas pipeline outer surface grinding and processing device according to claim 1, characterized in that: The pipe end fixator (2) includes an inner ring (21), a connecting shaft (22) and a plurality of arc-shaped clamping blocks (23). One end of the connecting shaft (22) is coaxially connected to one end of the inner ring (21) through a connecting frame. The plurality of clamping blocks (23) are arranged at intervals along the circumference and are coaxially distributed around the outer periphery of the inner ring (21). A plurality of adjusting screws (24) are threadedly connected to the inner ring (21) along the radial direction and penetrate through it. The plurality of adjusting screws (24) are movably connected to the plurality of clamping blocks (23) in a one-to-one correspondence.

3. The oil and gas pipeline outer surface grinding and processing device according to claim 1, characterized in that: The rotary drive mechanism (3) includes a motor (31), a support frame (32) and a drive shaft (33). The support frame (32) is installed outside one end of the chassis (1). The drive shaft (33) is horizontally arranged and is rotatably installed at the upper end of the support frame (32). One end of the drive shaft (33) is coaxially connected to the connecting shaft (22) of one of the pipe end fixators (2). The motor shaft of the motor (31) and the other end of the drive shaft (33) are respectively coaxially equipped with belt pulleys (34), and a belt is sleeved around the outside of the two belt pulleys (34).

4. The oil and gas pipeline outer surface grinding and processing device according to claim 1, characterized in that: A horizontally arranged and hollow carrier frame (11) is provided at the lower end inside the chassis (1). The moving frame (4) is installed on the upper part of the other end of the carrier frame (11) and can move horizontally along the carrier frame (11). The pipe support mechanism (6) is installed on the carrier frame (11).

5. The oil and gas pipeline outer surface grinding and processing device according to claim 4, characterized in that: At the lower end inside the chassis (1), a funnel-shaped bottom wall (12) is provided corresponding to the part below the carrier rack (11). A dust receiving port is provided in the middle of the bottom wall (12), and a dust receiving box (13) is provided below the dust receiving port. An opening for the dust receiving box (13) to enter and exit is provided at the lower part of one side of the chassis (1).

6. The oil and gas pipeline outer surface grinding and processing device according to claim 4, characterized in that: On both sides of the upper end of the carrier rack (11), a track (111) extending horizontally towards both ends of the chassis (1) is respectively provided. The lower ends of the moving racks (4) are respectively slidably mounted on the tracks (111). A first hydraulic telescopic device (9) connected to the moving rack (4) is provided at the other end of the carrier rack (11).

7. The oil and gas pipeline outer surface grinding and processing device according to claim 4, characterized in that: The pipe support mechanism (6) includes two groups of first linear moving devices (61), a carrier beam (62), multiple groups of hydraulic lifting devices (63) and a plurality of arc-shaped support members (64). The two groups of first linear moving devices (61) are respectively mounted on the upper parts of both ends of the carrier rack (11). The carrier beam (62) is horizontally mounted on the two groups of first linear moving devices (61). The multiple groups of hydraulic lifting devices (63) are respectively arranged at intervals in the horizontal direction between the two ends of the chassis (1) and are fixed to the upper ends of the carrier beam (62). The plurality of support members (64) are respectively mounted on the upper ends of the multiple groups of hydraulic lifting devices (63) in one-to-one correspondence. The two groups of first linear moving devices (61) are used to synchronously drive the carrier beam (62) to horizontally move between the two sides of the chassis (1).

8. The oil and gas pipeline outer surface grinding and processing device according to claim 4, characterized in that: The grinding assembly (5) includes a second linear moving device (51), a second hydraulic telescopic device (52), a connecting beam (53) and a plurality of electric grinding devices (54). The second linear moving device (51) is mounted on the inner side wall of the chassis (1). The second hydraulic telescopic device (52) is mounted on one side of the second linear moving device (51) through a connecting frame. The connecting beam (53) is horizontally mounted on the telescopic end of the second hydraulic telescopic device (52). The plurality of electric grinding devices (54) are horizontally spaced between the two ends of the chassis (1) and are respectively mounted on one side of the connecting beam (53).

9. The oil and gas pipeline outer surface grinding and processing device according to claim 8, characterized in that: Two groups of the grinding assemblies (5) are provided and are respectively mounted on the inner side walls of both sides of the chassis (1).

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