Oil and gas pipeline bending testing machine and testing method thereof

Abstract

The present application discloses an oil and gas pipeline bending test machine and a test method thereof, the test machine includes a driving device, the driving device is arranged at the front end of the main frame; two sliding load-bearing devices are respectively arranged on the left and right sides of the rear end of the main frame; there is a clamping space for the pipeline between the driving device and the sliding load-bearing device; two sliding support devices are respectively arranged on the left and right sides of the main frame; the sliding support device is used to support the pipeline. The method includes the steps of: adjusting the position of the slider on the sliding load-bearing device; then supporting the pipeline through the sliding support device; making the side wall of the pipeline contact with the arc surface of the slider; injecting water into the pipeline to form a set water pressure; controlling the driving device and applying force to the side wall of the pipeline through the pressure block; monitoring the pressure applied to the pipeline by the pressure sensor, and then measuring the bending deformation of the pipeline. The present application solves the problem in the prior art that there is no suitable bending test machine for large-scale long-distance pipelines to perform bending tests.

Description

Technical Field

[0001] The present application belongs to the technical field of pipeline testing, and specifically relates to an oil and gas pipeline bending testing machine and a testing method thereof. Background Art

[0002] With the accelerated advancement of natural gas market reform, the demand for natural gas in many application fields such as power generation, urban gas and industrial fuel has shown a rapid growth trend. As a carrier for natural gas transportation, the construction mileage of long-distance pipelines has become longer and longer, the pipe diameter has become larger and larger, and the operating pressure has become higher and higher, which has led to an increasing potential operating risk of the pipeline. When the pipeline is in operation, it is not only affected by the medium pressure inside the pipeline, but also by the complex external forces caused by pipeline deformation and welding stress. Therefore, the reliability of the pipeline is extremely important and is the cornerstone for ensuring the safe, quality and quantity of natural gas transportation.

[0003] However, natural gas leakage has occurred in pipelines that have been put into operation due to poor quality of the pipelines themselves. Pipeline leakage not only seriously restricts the transmission volume of the entire natural gas pipeline network, affects national production and people's lives, but also poses huge safety hazards, great economic losses and serious social risks. Before the pipeline is put into operation, it is necessary to test the pipeline, but there is currently no bending test device suitable for large-scale long-distance pipelines, so it cannot meet the existing use needs of natural gas transportation. Summary of the invention

[0004] The embodiments of the present application provide an oil and gas pipeline bending test machine and a test method thereof, thereby solving the problem in the prior art that there is no suitable bending test machine for large-scale long-distance pipelines to perform bending tests.

[0005] In order to achieve the above-mentioned object, an embodiment of the present invention provides an oil and gas pipeline bending tester, comprising a main frame, a driving device, two sliding load-bearing devices, and two sliding support devices;

[0006] The driving device is arranged at the front end of the main frame; the two sliding load-bearing devices are respectively arranged at the left and right sides of the rear end of the main frame; and there is a clamping space for the pipeline between the driving device and the sliding load-bearing devices;

[0007] The two sliding support devices are respectively arranged on the left and right sides of the middle of the main frame; the sliding support device is used to support the pipeline;

[0008] The main frame includes a base and a crossbeam, the base is in a concave shape, and the crossbeam is horizontally installed at the upper part of the rear end of the base;

[0009] The driving device includes a thrust cylinder, a pressure block, and a pressure sensor;

[0010] The thrust cylinder is installed at the front end of the base, the front end of the piston rod of the thrust cylinder is provided with the pressure block, the end face of the pressure block is an arc surface matched with the side wall of the pipeline, the length direction of the piston rod is perpendicular to the extension direction of the pipeline, and the pressure sensor is installed between the piston rod and the pressure block through the sensor bracket;

[0011] The sliding load-bearing device comprises a polished rod guide shaft, a lead screw guide shaft, and a sliding block;

[0012] The polished rod guide shaft and the lead screw guide shaft are respectively installed in parallel on the side wall of the crossbeam through guide shaft seats, and the extension direction of the polished rod guide shaft is parallel to the extension direction of the pipeline;

[0013] The slider is installed through the polished rod guide shaft and the lead screw guide shaft, the slider is slidably connected to the polished rod guide shaft, and the slider is threadedly connected to the lead screw guide shaft; the end surface of the slider facing the pressing block is a curved surface that matches the side wall of the pipeline;

[0014] The rotating shaft of the screw guide shaft is connected to the output shaft of the first hydraulic motor.

[0015] In a possible implementation, the driving device further includes a guide seat, a limiting guide rail, a first connecting seat, a second connecting seat, a support frame, and a supporting roller;

[0016] The guide seat is installed at the top of the front end of the base, the limit guide rail is slidably connected to the guide seat, the upper end of the pressure block is provided with the first connecting seat, the upper end of the sensor bracket is provided with the second connecting seat, and the first connecting seat and the second connecting seat are both fixedly connected to the limit guide rail;

[0017] The upper end of the support frame is connected to the lower end of the sensor bracket, and the lower end of the support frame is provided with the support roller, which abuts against the upper surface of the middle part of the base.

[0018] In a possible implementation, the sliding load-bearing device further includes a pressure strip;

[0019] The pressure strips are arranged on both sides of the slider, the side walls of the slider are in contact with the side walls of the pressure strips, and the pressure strips are parallel to the guide axis of the polished rod.

[0020] In a possible implementation, the sliding support device includes a horizontal slide rail, a flat trolley, a screw rod, a screw sleeve, a pipe bracket, and a support plate;

[0021] The horizontal slide rails are arranged on both sides of the base, and the extension direction of the horizontal slide rails is parallel to the extension direction of the pipeline;

[0022] The flatbed trolley is arranged on the horizontal slide rail, and driving rollers and driven rollers are arranged on both sides of the bottom of the flatbed trolley, and the rotating shaft of the driving roller is connected to the output shaft of the second hydraulic motor;

[0023] The screw rods are horizontally arranged on both sides of the flatbed trolley, the length direction of the screw rods is perpendicular to the extension direction of the horizontal slide rails, the screw rods are installed on the flatbed trolley through screw rod seats, the screw sleeves are sleeved on the screw rods, the screw sleeves and the screw rods are threadedly connected, the pipe brackets are arranged between the screw rods on both sides, and the pipe brackets and the screw sleeves are fixedly connected; the output shaft of the third hydraulic motor is connected to the rotating shaft of the screw rod;

[0024] The support plate for supporting the pipeline is arranged on the top of the pipe support.

[0025] In a possible implementation, the main frame and the sliding support device are arranged in a deep pit on the ground.

[0026] The embodiment of the present invention further provides an oil and gas pipeline bending test method, which uses the above-mentioned oil and gas pipeline bending test machine and includes the following steps:

[0027] Adjust the position of the slider on the sliding load-bearing device according to the pipeline to be tested;

[0028] Adjust the positions of the two sliding support devices, then hoist the pipeline to be tested to the middle of the main frame so that both sides of the pipeline are supported by the sliding support devices;

[0029] The position of the pipeline is adjusted by the sliding support device so that the side wall of the pipeline contacts the arc surface of the slider;

[0030] Fill the pipe with water to form a set water pressure in the pipe;

[0031] Start the thrust cylinder of the driving device, the piston rod of the thrust cylinder extends and applies force to the side wall of the pipeline through the pressure block, and the sliders on both sides form symmetrical support points;

[0032] The pressure applied by the pressure block to the pipeline is monitored by a pressure sensor. When the pressure reaches the set value, it is maintained for a certain period of time, and then the bending deformation of the pipeline is measured.

[0033] One or more technical solutions provided in the embodiments of the present invention have at least the following technical effects or advantages:

[0034] The embodiment of the present invention provides an oil and gas pipeline bending tester and a test method thereof. When the tester is working, the first hydraulic motor is started, and the first hydraulic motor drives the lead screw guide shaft to rotate. The slider can move on it under the action of the light rod guide shaft and the lead screw guide shaft, and the sliders on both sides form symmetrical support points, thereby realizing the adjustment of the support point spacing. The pipeline is supported by a sliding support device, and the side wall of the pipeline is in contact with the arc surface of the slider; then water is injected into the pipeline to form a set water pressure in the pipeline; the thrust cylinder of the driving device is started, and the piston rod of the thrust cylinder is extended and applies force to the side wall of the pipeline through a pressure block, and the sliders on both sides form symmetrical support points; the pressure applied by the pressure block to the pipeline is monitored by a pressure sensor, and when the pressure reaches the set value, it is maintained for a certain period of time, and then the bending deformation of the pipeline is measured. The sliding support device of the present invention is used to support the pipeline, the slider of the sliding load-bearing device forms a symmetrical support point, and the thrust cylinder of the driving device implements the loading force, thereby realizing the test form of horizontal loading and three-point bending moment, and the structural form of the main frame can facilitate the realization of such a test form. The testing machine of the present invention can realize automatic operation, monitor the loading force according to the pressure sensor, adjust the loading force through the thrust cylinder, automatically maintain the pressure when the loading force reaches the set value, and the system collects the loading force and the deformation of the pipeline. The method of the present invention can verify the reliability of the pipeline quality when the pipeline is subjected to the combined action of internal medium pressure and complex external forces, thereby ensuring the quality of the pipeline itself and meeting the use requirements during natural gas transportation. The testing machine of the present invention has a simple structure, is easy to operate, has strong practicality, and is easy to promote and use. The method can exclude pipelines with quality problems before they are put into operation, thereby ensuring the reliability of the pipeline quality when the pipeline is subjected to the combined action of internal medium pressure and complex external forces, thereby ensuring the safe operation of long-distance pipelines. The present invention solves the problem in the prior art that there is no suitable bending testing machine for large-scale long-distance pipelines to perform bending tests. BRIEF DESCRIPTION OF THE DRAWINGS

[0035] In order to more clearly illustrate the technical solutions of the embodiments of the present application, the following briefly introduces the drawings required for use in the description of the embodiments. Obviously, the drawings described below are only some embodiments recorded in the present application, and for ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work.

[0036] Figure 1 A schematic structural diagram of an oil and gas pipeline bending testing machine provided in an embodiment of the present invention.

[0037] Figure 2 A schematic structural diagram of a driving device provided in an embodiment of the present invention.

[0038] Figure 3 A schematic structural diagram of a sliding load-bearing device provided in an embodiment of the present invention.

[0039] Figure 4 A schematic structural diagram of a sliding support device provided in an embodiment of the present invention.

[0040] Figure 5 A schematic diagram of the working state of the oil and gas pipeline bending testing machine provided in an embodiment of the present invention.

[0041] Reference numerals: 100-main frame; 101-base; 102-crossbeam; 200-driving device; 201-thrust cylinder; 202-pressing block; 203-pressure sensor; 204-sensor bracket; 205-support roller; 206-guide seat; 207-limiting guide rail; 208-first connecting seat; 209-second connecting seat; 210-support frame; 300-sliding load-bearing device; 301-light rod guide shaft; 302-screw guide shaft; 303-sliding block; 304-pressing strip; 305- The first hydraulic motor; 400-sliding support device; 401-horizontal slide rail; 402-flat trolley; 403-screw rod; 404-screw sleeve; 405-pipe bracket; 406-support plate; 407-driving roller; 408-driven roller; 409-second hydraulic motor; 410-third hydraulic motor; 411-clip plate; 412-lifting cylinder; 413-bare rod; 414-support block; 415-seat body; 416-rotating rod; 417-guide groove; 500-pipeline; 600-ground pit. DETAILED DESCRIPTION

[0042] 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 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.

[0043] In the description of the embodiments of the present invention, it should be noted that the terms "center", "up", "down", "left", "right", "vertical", "horizontal", "inside", "outside" and the like indicate positions or positional relationships based on the positions or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the embodiments of the present invention and simplifying the description, rather than indicating or implying that the devices or elements referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as limitations on the present invention. The terms "first", "second", and "third" are used for descriptive purposes only and cannot be understood as indicating or implying relative importance. In addition, the terms "installed", "connected", and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be an indirect connection through an intermediate medium, or it can be a connection between the two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the embodiments of the present invention can be understood according to the specific circumstances.

[0044] like Figures 1 to 5 As shown, the oil and gas pipeline bending testing machine provided by the embodiment of the present invention includes a main frame 100, a driving device 200, two sliding load-bearing devices 300, and two sliding support devices 400.

[0045] The driving device 200 is arranged at the front end of the main frame 100. Two sliding bearing devices 300 are respectively arranged at the left and right sides of the rear end of the main frame 100. Between the driving device 200 and the sliding bearing device 300 is a clamping space for the pipe 500.

[0046] The two sliding support devices 400 are respectively disposed on the left and right sides of the middle of the main frame 100. The sliding support devices 400 are used to support the pipeline 500.

[0047] The main frame 100 includes a base 101 and a crossbeam 102 . The base 101 is in a concave shape, and the crossbeam 102 is horizontally installed at the upper part of the rear end of the base 101 .

[0048] The driving device 200 includes a thrust cylinder 201 , a pressure block 202 , and a pressure sensor 203 .

[0049] The thrust cylinder 201 is installed at the front end of the base 101. A pressure block 202 is provided at the front end of the piston rod of the thrust cylinder 201. The end face of the pressure block 202 is an arc surface that matches the side wall of the pipeline 500. The length direction of the piston rod is perpendicular to the extension direction of the pipeline 500. The pressure sensor 203 is installed between the piston rod and the pressure block 202 through the sensor bracket 204.

[0050] The sliding load-bearing device 300 includes a polished rod guide shaft 301 , a lead screw guide shaft 302 , and a sliding block 303 .

[0051] The polished rod guide shaft 301 and the lead screw guide shaft 302 are respectively installed in parallel on the side wall of the crossbeam 102 through guide shaft seats, and the extension direction of the polished rod guide shaft 301 is parallel to the extension direction of the pipeline 500 .

[0052] The slider 303 is installed through the polished rod guide shaft 301 and the lead screw guide shaft 302. The slider 303 is slidably connected to the polished rod guide shaft 301, and the slider 303 is threadedly connected to the lead screw guide shaft 302. The end surface of the slider 303 facing the pressing block 202 is a curved surface that matches the side wall of the pipe 500.

[0053] The rotating shaft of the screw guide shaft 302 is connected to the output shaft of the first hydraulic motor 305 .

[0054] It should be noted that the base 101 and the crossbeam 102 are both steel structure welded parts, and the structure of the main frame 100 is convenient for hoisting the pipeline 500. The deformation of the pipeline 500 can be monitored by a strain gauge, which is installed at the pipeline 500 and the pressure block 202. The setting of the strain gauge is a prior art and will not be repeated here.

[0055] When the test machine is working, the first hydraulic motor 305 is started, and the first hydraulic motor 305 drives the lead screw guide shaft 302 to rotate. The slider 303 can move on the light rod guide shaft 301 and the lead screw guide shaft 302, and the sliders 303 on both sides form symmetrical support points, thereby realizing the adjustment of the support point spacing. The pipeline 500 is supported by the sliding support device 400, and the side wall of the pipeline 500 is in contact with the arc surface of the slider 303. Then water is injected into the pipeline 500 to form a set water pressure in the pipeline 500. The thrust cylinder 201 of the driving device 200 is started, and the piston rod of the thrust cylinder 201 is extended and applies force to the side wall of the pipeline 500 through the pressure block 202, and the sliders 303 on both sides form symmetrical support points. The pressure applied by the pressure block 202 to the pipeline 500 is monitored by the pressure sensor 203. When the pressure reaches the set value, it is maintained for a certain period of time, and then the bending deformation of the pipeline 500 is measured. The sliding support device 400 of the present invention is used to support the pipeline 500, the slider 303 of the sliding load-bearing device 300 forms a symmetrical support point, and the thrust cylinder 201 of the driving device 200 implements the loading force, thereby realizing the test form of horizontal loading and three-point bending moment. The structural form of the main frame 100 can facilitate the realization of such a test form. The testing machine of the present invention can perform a simulation test on the pipeline 500, and is suitable for the water pressure + bending test of steel pipes with a diameter below DN1400. The testing machine of the present invention can realize automatic operation, monitor the loading force according to the pressure sensor 203, adjust the loading force through the thrust cylinder 201, and automatically maintain the pressure when the loading force reaches the set value. The system collects the loading force and the deformation of the pipeline 500. The present invention can verify the reliability of the quality of the pipeline 500 when the pipeline 500 is subjected to the combined action of the internal medium pressure and complex external forces, thereby ensuring the quality of the pipeline 500 itself and meeting the use requirements during natural gas transportation. The testing machine of the present invention has a simple structure, is easy to operate, has strong practicality, and is easy to promote and use.

[0056] In this embodiment, the driving device 200 further includes a guide seat 206 , a limiting guide rail 207 , a first connecting seat 208 , a second connecting seat 209 , a supporting frame 210 , and a supporting roller 205 .

[0057] The guide seat 206 is installed at the top of the front end of the base 101, the limiting guide rail 207 is slidably connected to the guide seat 206, the upper end of the pressure block 202 is provided with a first connecting seat 208, and the upper end of the sensor bracket 204 is provided with a second connecting seat 209, and the first connecting seat 208 and the second connecting seat 209 are both fixedly connected to the limiting guide rail 207.

[0058] The upper end of the support frame 210 is connected to the lower end of the sensor bracket 204 , and a support roller 205 is disposed at the lower end of the support frame 210 . The support roller 205 abuts against the upper surface of the middle portion of the base 101 .

[0059] It should be noted that when the piston rod of the thrust cylinder 201 extends and drives the pressure block 202 to move, the first connecting seat 208, the second connecting seat 209 and the limiting guide rail 207 slide on the guide seat 206 under the action of the thrust cylinder 201, and the limiting guide rail 207 can ensure that the pressure block 202 is in a linear motion state. The support frame 210 can support the pressure block 202 and the pressure sensor 203 to prevent the end of the piston rod of the thrust cylinder 201 from affecting the normal progress of the test under the action of the gravity of the pressure block 202 and the pressure sensor 203, thereby improving the reliability during the test.

[0060] In this embodiment, the sliding load-bearing device 300 further includes a pressure strip 304 .

[0061] The pressure strips 304 are disposed on both sides of the slider 303 , the side walls of the slider 303 are in contact with the side walls of the pressure strips 304 , and the pressure strips 304 are parallel to the polished rod guide axis 301 .

[0062] It should be noted that the pressure strip 304 can limit and support the slider 303 to ensure the horizontal movement of the slider 303.

[0063] In this embodiment, the sliding support device 400 includes a horizontal slide rail 401 , a flat trolley 402 , a screw rod 403 , a screw sleeve 404 , a pipe support 405 , and a support plate 406 .

[0064] Horizontal slide rails 401 are disposed on both sides of the base 101 , and the extension direction of the horizontal slide rails 401 is parallel to the extension direction of the pipeline 500 .

[0065] The flatbed trolley 402 is disposed on a horizontal slide rail 401 . A driving roller 407 and a driven roller 408 are disposed on both sides of the bottom of the flatbed trolley 402 . The rotating shaft of the driving roller 407 is connected to the output shaft of the second hydraulic motor 409 .

[0066] Screws 403 are horizontally arranged on both sides of the flatbed trolley 402, and the length direction of the screws 403 is perpendicular to the extension direction of the horizontal slide rail 401. The screws 403 are installed on the flatbed trolley 402 through screw seats, and screw sleeves 404 are sleeved on the screws 403. The screw sleeves 404 and the screws 403 are threadedly connected. The pipe brackets 405 are arranged between the screws 403 on both sides, and the pipe brackets 405 and the screw sleeves 404 are fixedly connected. The output shaft of the third hydraulic motor 410 is connected to the rotating shaft of the screw 403.

[0067] A support plate 406 for supporting the pipeline 500 is disposed on the top of the pipe support 405 .

[0068] It should be noted that the thrust cylinder 201, the first hydraulic motor 305, the second hydraulic motor 409, and the third hydraulic motor 410 share a hydraulic system, and the thrust cylinder 201, the first hydraulic motor 305, the second hydraulic motor 409, and the third hydraulic motor 410 operate independently without affecting each other.

[0069] The second hydraulic motor 409 can drive the active roller 407 to rotate, thereby driving the flatbed trolley 402 to slide on the horizontal slide rail 401, thereby changing the supporting position of the sliding support device 400 on the pipeline 500.

[0070] The third hydraulic motor 410 can drive the screw 403 to rotate. Since the screw sleeves 404 and the pipe supports 405 on both sides of the screw 403 are fixedly connected, the screw 403 can drive the pipe support 405 to move along the screw 403 when it rotates, thereby achieving the purpose of the sliding support device 400 driving the pipeline 500 to move in its vertical direction.

[0071] In this embodiment, clamping plates 411 are provided at both ends of the bottom of the flatbed trolley 402 , and the upper portion of the horizontal slide rail 401 is clamped in the groove body at the lower end of the clamping plate 411 .

[0072] It should be noted that when the flatbed trolley 402 slides on the horizontal slide rail 401, the upper part of the horizontal slide rail 401 is always clamped in the groove body at the lower end of the clamping plate 411, thereby playing a limiting role and preventing the flatbed trolley 402 from tipping over from the horizontal slide rail 401.

[0073] In this embodiment, the sliding support device 400 further includes a lifting cylinder 412 and a polished rod 413 .

[0074] A lifting cylinder 412 is installed in the pipe support 405. The piston rod of the lifting cylinder 412 extends out of the top of the pipe support 405 and is connected to the lower surface of the support plate 406. A light rod 413 is arranged on both sides of the lifting cylinder 412. The light rod 413 is slidably installed in the hole of the pipe support 405, and the upper end of the light rod 413 is connected to the lower surface of the support plate 406.

[0075] It should be noted that the piston rod of the lifting cylinder 412 can drive the support plate 406 to move up and down, and the light rod 413 can limit the support plate 406 to ensure the movement direction and stability of the support plate 406 during movement. The lifting cylinder 412 can achieve the purpose of the sliding support device 400 driving the pipeline 500 to move in the vertical direction. In summary, it can be seen that the sliding support device 400 can drive the pipeline 500 to move in the vertical direction, the horizontal x-axis, and the horizontal y-axis.

[0076] In this embodiment, the sliding support device 400 further includes a support block 414 , a seat body 415 , and a rotating rod 416 .

[0077] Guide grooves 417 are provided on both sides of the support plate 406 , and the lower end of the support block 414 is slidably installed in the guide grooves 417 .

[0078] A seat body 415 is disposed at both ends of the upper surface of the support plate 406 . The end of the rotating rod 416 is screwed into the threaded hole on the seat body 415 and then rotatably connected to the end of the supporting block 414 .

[0079] The upper surface of the support block 414 is a support surface for supporting the pipeline 500 , and the support surface is inclined toward the center of the support plate 406 .

[0080] It should be noted that by twisting the rotating rod 416 to rotate it, the rotating rod 416 can drive the support block 414 to move along the guide groove 417, thereby adjusting the distance between the two support blocks 414. Adjusting the distance between the two support blocks 414 can enable the sliding support device 400 to support pipes 500 of different diameters.

[0081] In this embodiment, the main frame 100 and the sliding support device 400 are disposed in a deep pit 600 on the ground.

[0082] It should be noted that the testing machine is entirely placed in a deep pit 600 on the ground. During the test, a cover plate is added to the deep pit 600 on the ground so that the entire test is carried out in a closed pit, thereby ensuring the safety of the pipeline 500 during the pressure test.

[0083] like Figures 1 to 5 As shown, an embodiment of the present invention further provides an oil and gas pipeline bending test method, using the above-mentioned oil and gas pipeline bending test machine, comprising the following steps:

[0084] The position of the sliding block 303 on the sliding load-bearing device 300 is adjusted according to the pipeline 500 to be tested.

[0085] The positions of the two sliding support devices 400 are adjusted, and then the pipeline 500 to be tested is hoisted to the middle of the main frame 100 so that both sides of the pipeline 500 are supported by the sliding support devices 400 .

[0086] The position of the pipe 500 is adjusted by the sliding support device 400 so that the side wall of the pipe 500 contacts the arc surface of the sliding block 303 .

[0087] Water is injected into the pipe 500 to form a set water pressure in the pipe 500. A water injection valve is provided on the side wall of the pipe 500.

[0088] The thrust cylinder 201 of the driving device 200 is started, and the piston rod of the thrust cylinder 201 is extended and applies force to the side wall of the pipeline 500 through the pressing block 202, and the sliders 303 on both sides form symmetrical supporting points.

[0089] The pressure applied by the pressure block 202 to the pipeline 500 is monitored by the pressure sensor 203. When the pressure reaches a set value, it is maintained for a certain period of time, and then the bending deformation of the pipeline 500 is measured.

[0090] It should be noted that by using a testing machine to perform the above-mentioned testing method on the pipeline 500, the pipeline 500 with quality problems can be eliminated before it goes online, so that when the pipeline 500 is subjected to the combined action of the internal medium pressure and complex external forces, the reliability of the quality of the pipeline 500 is ensured, thereby ensuring the safe operation of the long-distance pipeline 500. The present invention solves the problem in the prior art that there is no suitable bending testing machine for large-scale long-distance pipelines 500 to perform bending tests.

[0091] In this embodiment, when adjusting the positions of the two sliding support devices 400 , the position of the flatbed trolley 402 on the horizontal slide rail 401 is adjusted first, and then the distance between the two support blocks 414 is adjusted, and the pipeline 500 is supported by the two support blocks 414 .

[0092] When the position of the pipeline 500 is adjusted by the sliding support device 400, the lifting cylinder 412 is started, and the lifting cylinder 412 adjusts the pipeline 500 to a set height through the supporting plate 406. Then the third hydraulic motor 410 is started, and the third hydraulic motor 410 rotates the screw rod 403, and then drives the pipe support 405 to move along the vertical direction of the pipeline 500 through the screw sleeve 404. The pipe support 405 moves the pipeline 500 through the supporting plate 406 until the side wall of the pipeline 500 contacts the arc surface of the slider 303.

[0093] It should be noted that by supporting the pipeline 500 through the sliding support device 400, the position of the pipeline 500 in the vertical direction, the horizontal x-axis, and the horizontal y-axis can be adjusted. The adjustment process is highly reliable and easy to operate, thereby meeting the support requirements of the test method of the present invention for the pipeline 500.

[0094] In this embodiment, it is obvious to those skilled in the art that the present invention is not limited to the details of the above exemplary embodiments, and that the present invention can be implemented in other specific forms without departing from the spirit or essential features of the present invention. Therefore, no matter from which point of view, the embodiments should be regarded as exemplary and non-restrictive, and the scope of the present invention is defined by the appended claims rather than the above description, and therefore it is intended that all changes falling within the meaning and scope of the equivalent elements of the claims are included in the present invention.

Claims

1. An oil and gas pipeline bending tester, characterized in that: It comprises a main frame (100), a driving device (200), two sliding load-bearing devices (300), and two sliding support devices (400); The driving device (200) is arranged at the front end of the main frame (100); the two sliding load-bearing devices (300) are respectively arranged at the left and right sides of the rear end of the main frame (100); and a clamping space for the pipeline (500) is provided between the driving device (200) and the sliding load-bearing devices (300); The two sliding support devices (400) are respectively arranged on the left and right sides of the middle of the main frame (100); the sliding support devices (400) are used to support the pipeline (500); The main frame (100) comprises a base (101) and a crossbeam (102); the base (101) is in a concave-shaped structure; and the crossbeam (102) is horizontally mounted on the upper portion of the rear end of the base (101); The driving device (200) comprises a thrust cylinder (201), a pressure block (202), and a pressure sensor (203); The thrust cylinder (201) is installed at the front end of the base (101); the front end of the piston rod of the thrust cylinder (201) is provided with the pressure block (202); the end face of the pressure block (202) is an arc surface that matches the side wall of the pipeline (500); the length direction of the piston rod is perpendicular to the extension direction of the pipeline (500); and the pressure sensor (203) is installed between the piston rod and the pressure block (202) via a sensor bracket (204); The sliding load-bearing device (300) comprises a polished rod guide shaft (301), a lead screw guide shaft (302), and a sliding block (303); The polished rod guide shaft (301) and the lead screw guide shaft (302) are respectively mounted in parallel on the side wall of the crossbeam (102) via guide shaft seats, and the extension direction of the polished rod guide shaft (301) is parallel to the extension direction of the pipeline (500); The slider (303) is installed through the polished rod guide shaft (301) and the lead screw guide shaft (302); the slider (303) and the polished rod guide shaft (301) are slidably connected; the slider (303) and the lead screw guide shaft (302) are threadedly connected; the end surface of the slider (303) facing the pressing block (202) is a curved surface that matches the side wall of the pipe (500); The rotating shaft of the screw guide shaft (302) is connected to the output shaft of the first hydraulic motor (305); The driving device (200) further comprises a guide seat (206), a position-limiting guide rail (207), a first connecting seat (208), a second connecting seat (209), a support frame (210), and a supporting roller (205); The guide seat (206) is installed on the top of the front end of the base (101), the limiting guide rail (207) is slidably connected to the guide seat (206), the upper end of the pressing block (202) is provided with the first connecting seat (208), the upper end of the sensor bracket (204) is provided with the second connecting seat (209), and the first connecting seat (208) and the second connecting seat (209) are both fixedly connected to the limiting guide rail (207); The upper end of the support frame (210) is connected to the lower end of the sensor bracket (204), the lower end of the support frame (210) is provided with the support roller (205), and the support roller (205) abuts against the upper surface of the middle part of the base (101); The sliding support device (400) comprises a horizontal slide rail (401), a flat trolley (402), a screw rod (403), a screw sleeve (404), a pipe support (405), and a support plate (406); The horizontal slide rails (401) are arranged on both sides of the base (101), and the extension direction of the horizontal slide rails (401) is parallel to the extension direction of the pipeline (500); The flatbed trolley (402) is arranged on the horizontal slide rail (401), and driving rollers (407) and driven rollers (408) are arranged on both sides of the bottom of the flatbed trolley (402), and the rotating shaft of the driving roller (407) is connected to the output shaft of the second hydraulic motor (409); The screw rods (403) are horizontally arranged on both sides of the flatbed trolley (402), the length direction of the screw rods (403) is perpendicular to the extension direction of the horizontal slide rail (401), the screw rods (403) are installed on the flatbed trolley (402) through a screw rod seat, the screw sleeve (404) is sleeved on the screw rod (403), the screw sleeve (404) and the screw rod (403) are threadedly connected, the pipe bracket (405) is arranged between the screw rods (403) on both sides, and the pipe bracket (405) and the screw sleeve (404) are fixedly connected; the output shaft of the third hydraulic motor (410) is connected to the rotating shaft of the screw rod (403); The support plate (406) for supporting the pipeline (500) is arranged on the top of the pipe support (405).

2. The oil and gas pipeline bending tester according to claim 1 is characterized in that: The sliding load-bearing device (300) further comprises a pressure strip (304); The pressure strip (304) is arranged on both sides of the slider (303), the side wall of the slider (303) is in contact with the side wall of the pressure strip (304), and the pressure strip (304) is parallel to the polished rod guide axis (301).

3. The oil and gas pipeline bending tester according to claim 2 is characterized in that: The main frame (100) and the sliding support device (400) are arranged in a deep pit (600) on the ground.

4. A method for testing the bending of an oil and gas pipeline, characterized in that: The oil and gas pipeline bending tester according to any one of claims 1 to 3 is used, comprising the following steps: Adjusting the position of the slide block (303) on the sliding load-bearing device (300) according to the pipeline (500) to be tested; Adjust the positions of the two sliding support devices (400), then hoist the pipeline (500) to be tested to the middle of the main frame (100), so that both sides of the pipeline (500) are supported by the sliding support devices (400); The position of the pipeline (500) is adjusted by means of the sliding support device (400) so that the side wall of the pipeline (500) contacts the arc surface of the sliding block (303); Injecting water into the pipe (500) to form a set water pressure in the pipe (500); The thrust cylinder (201) of the driving device (200) is started, the piston rod of the thrust cylinder (201) is extended and applies force to the side wall of the pipeline (500) through the pressure block (202), and the sliders (303) on both sides form symmetrical support points; The pressure applied by the pressure block (202) to the pipeline (500) is monitored by a pressure sensor (203). When the pressure reaches a set value, it is maintained for a certain period of time, and then the bending deformation of the pipeline (500) is measured.

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