A gas pipeline material strength detection device and detection method

Abstract

The application relates to the technical field of material strength detection devices, in particular to a gas pipeline material strength detection device and a detection method. The gas pipeline material strength detection device comprises a detection table, a first extensometer and two clamping pieces, the first extensometer is installed on the detection table and located between the two clamping pieces, and the first extensometer comprises a first supporting arm, a second supporting arm, two first clamping wheels and two second clamping wheels. The two first clamping wheels can rotate and are slidably installed on the first supporting arm in the horizontal direction. The two second clamping wheels can rotate and are slidably installed on the second supporting arm in the horizontal direction. When the test piece is fractured, the two first clamping wheels and the two second clamping wheels can be caused to move away from each other by the test piece, the impact of the test piece on the first extensometer is weakened, and the probability of damage of the first extensometer is reduced, thereby providing guarantee for the detection service of the rubber new material in the gas pipeline material.

Description

Technical Field

[0001] This invention relates to the field of material strength testing devices, specifically to a gas pipeline material strength testing device and testing method. Background Technology

[0002] The safe and stable operation of gas pipelines depends not only on the structural strength of the main pipeline material but also on the performance reliability of the supporting materials. Rubber materials, as an indispensable component in gas pipeline systems, are widely used in key applications such as seals and flexible connectors. With technological upgrades in the gas pipeline industry, rubber materials are continuously being developed, iterated, and put into use. These new materials offer advantages over traditional rubber materials in terms of toughness, corrosion resistance, and sealing performance, and can meet the higher standards required for safe operation of gas pipelines.

[0003] Before new rubber materials are put into use, their performance must be rigorously evaluated through strength testing. Tensile testing is the core testing method, accurately obtaining key parameters such as tensile strength, elastic modulus, yield strength, and elongation, providing a basis for material quality assessment. During tensile testing, the extensometer, as the core instrument for directly measuring the deformation of the gauge length of the specimen, works by monitoring the length change of the specimen (either a new rubber material specimen or a traditional rubber material specimen) under tensile force in real time, and then calculating the strain data. Compared with the displacement measurement system built into the testing machine, the extensometer can effectively eliminate errors in the testing system (such as fixture slippage, machine stiffness deformation, and worktable vibration), ensuring the accuracy and reliability of the test data.

[0004] However, during the fracture stage of the tensile test, at the instant the specimen breaks, the two ends of the gauge length will rapidly contract towards the middle, and the internal stress will be released instantly, resulting in a violent rebound phenomenon, forming a strong impact load, which will directly act on the extensometer. This can easily damage the internal components of the extensometer, reduce the service life of the extensometer, and affect the accuracy of the test results. Summary of the Invention

[0005] This invention provides a gas pipeline material strength testing device and testing method to solve the problem that in the fracture stage of the tensile test, the strong impact load generated by the rebound of the gas pipeline material directly acts on the extensometer, which can easily cause damage to the internal components of the extensometer.

[0006] The present invention provides a gas pipeline material strength testing device with the following technical solution: A gas pipeline material strength testing device for testing the strength of a test specimen includes a testing platform, a first extensometer, and two clamping members. The two clamping members are arranged vertically on the testing platform and are capable of clamping and stretching the specimen. The first extensometer is mounted on the testing platform and located between the two clamping members. The first extensometer includes a first arm, a second arm, two first clamping wheels, and two second clamping wheels. The first arm is slidably mounted on the testing platform, and both first clamping wheels are rotatable and slidably mounted on the first arm in the horizontal direction. The second arm is slidably mounted below the first arm by a limiting pin. In the initial state, the limiting pin only allows the second arm to move upward, and both second clamping wheels are rotatable and slidably mounted horizontally. The first extensometer is slidably mounted on the second arm in a horizontal direction. Both the first and second clamping wheels are eccentric wheels, allowing the specimen to be clamped between them. Initially, the proximal ends of the first and second clamping wheels are in contact with the specimen. Both the first and second arms are equipped with adjustment sections that can restrict or allow the two first and second clamping wheels to move horizontally. The first extensometer has a first state and a second state. In the first state, the first and second arms are relatively stationary, and the adjustment section restricts the two first and second clamping wheels from moving horizontally. In the second state, the first and second arms are relatively close together, and the adjustment section allows the two first and second clamping wheels to move horizontally. Initially, the first extensometer is in the first state.

[0007] Furthermore, it also includes a second extensometer, which is mounted on the test table and located below the first extensometer. The second extensometer includes a third arm and two third clamping wheels. The third arm is slidably mounted on the test table, and the two third clamping wheels are rotatably mounted on the third arm. The third clamping wheels are eccentric wheels, and the specimen can be clamped between the two third clamping wheels. In the initial state, the proximal end of the third clamping wheel is in contact with the specimen.

[0008] Furthermore, a sliding rod is provided on the testing platform. The sliding rod is arranged vertically, and the first arm is slidably installed on the sliding rod through the first support, while the third arm is slidably installed on the sliding rod through the second support.

[0009] Furthermore, both the first clamping wheel and the second clamping wheel include a wheel body and a wheel axle. The wheel axle is eccentrically arranged relative to the wheel body and fixedly connected to the wheel body. The wheel axle of the first clamping wheel is rotatable relative to the first support arm and is slidable in the horizontal direction. The wheel axle of the second clamping wheel is rotatable relative to the second support arm and is slidable in the horizontal direction.

[0010] Furthermore, the adjustment unit includes two adjustment components. Both the first and second arms include two mounting arms, both of which are U-shaped. The two mounting arms are arranged face-to-face and fixedly connected in the horizontal direction. The arrangement direction of the two mounting arms is referred to as the first direction. Each mounting arm corresponds to one of the adjustment components. The adjustment component includes a telescopic block, a insert plate, and two push rods. The axle direction of the first clamping wheel is parallel to the axle direction of the second clamping wheel. The axle directions of the first and second clamping wheels are referred to as the second direction. The second direction is horizontal and perpendicular to the first direction. Both ends of the axle of the first and second clamping wheels are connected to sliders via a first torsion spring. The sliders are slidably mounted on the corresponding mounting arms along the first direction. On the mounting arm, two push rods are slidably mounted on the mounting arm in the second direction, and the push rods and sliders are set one-to-one. In the initial state, the push rods abut against their corresponding sliders. The telescopic block is slidably mounted on the mounting arm and can extend and retract in the second direction. The telescopic block slides in cooperation with the two push rods. The insert plate is mounted on the mounting arm. In the two mounting arms of the first arm, the insert plate is located at the lower end of the two mounting arms. The insert plate can be inserted into the telescopic block located below it and causes the telescopic block to extend in the second direction. In the two mounting arms of the second arm, the insert plate is located at the upper end of the two mounting arms. The insert plate can be inserted into the telescopic block located above it and causes the telescopic block to extend in the second direction.

[0011] Furthermore, each of the two push rods has a limiting groove, which is an oblong groove. The telescopic block includes two blocks connected by a spring. The insert plate can be inserted between the two blocks. Each of the two blocks is provided with a mating block, which corresponds to the limiting groove. The mating block slides with its corresponding limiting groove, and in the initial state, the two mating blocks are far apart from each other in the second direction.

[0012] Furthermore, the insert plate installed on the mounting arm of the first arm is offset from the insert plate installed on the mounting arm of the second arm in the first direction, and the thickness of the telescopic block in the first direction is greater than the thickness of the insert plate in the first direction.

[0013] Furthermore, the two clamping components are arranged facing each other in the vertical direction. The clamping components include a mounting block, a telescopic rod, and two wedge-shaped clamping blocks. The mounting block is mounted on the testing table and can move up and down relative to the testing table. The telescopic rod is arranged in the vertical direction and is mounted in the mounting block and can move up and down. The two wedge-shaped clamping blocks are slidably mounted in the mounting block, and a clamping space is defined between the two wedge-shaped clamping blocks. The two wedge-shaped clamping blocks are engaged with the telescopic rod, and when the telescopic rod moves up and down, the two wedge-shaped clamping blocks can move synchronously with it, and the two wedge-shaped clamping blocks move closer to each other or further away from each other.

[0014] Furthermore, the telescopic rod is provided with a first rod, and each of the two wedge-shaped clamping blocks is provided with a second rod. The mounting block has a first groove and two second grooves. The first groove is an oblong groove and is set vertically. The first rod is slidably installed in the first groove. The second groove is an oblong groove and is set at an angle. The second rod is set in a one-to-one correspondence with the second groove and is slidably installed in its corresponding second groove. The clamping component also includes a locking rod. The locking rod is rotatably installed on the mounting block by a second torsion spring, and the locking rod has a third groove. The third groove is an oblong groove and slides in cooperation with the first rod.

[0015] The present invention also provides a method for testing the strength of gas pipeline materials, which utilizes the above-mentioned gas pipeline material strength testing device and includes the following steps: S10, clamping the specimen between two clamping members and stretching the specimen; S20, during the tensile process of the specimen, the first extensometer is in the first state, the first arm and the second arm are relatively stationary, and the adjustment part restricts the two first clamping wheels and the two second clamping wheels from moving in the horizontal direction; and at this time, the first extensometer will collect the strain parameters / deformation of the specimen. S30, when the specimen breaks under tension, the first extensometer is in the second state, the first arm and the second arm are relatively close to each other, and the adjustment part allows the two first clamping wheels and the two second clamping wheels to move in the horizontal direction.

[0016] The beneficial effects of this invention are as follows: The gas pipeline material strength testing device of this invention, by setting a first extensometer, a sliding rod, and two clamping components on a testing platform, and configuring the first and second clamping wheels as an eccentric structure, ensures that when the upper gauge section is initially subjected to tension, both the first and second clamping wheels rotate from the proximal end to the distal end, increasing the clamping force on the upper gauge section and improving clamping stability. Furthermore, when the specimen breaks, the two first and two second clamping wheels are pushed away from each other by the specimen, making room for the specimen, reducing the impact of the specimen on the first extensometer, lowering the probability of damage to the first extensometer, and extending its service life. This provides a guarantee for the testing services of new rubber materials in gas pipelines. Attached Figure Description

[0017] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0018] Figure 1 This is a schematic diagram of the overall structure of an embodiment of a gas pipeline material strength testing device according to the present invention; Figure 2This is a schematic diagram of the overall structure of an embodiment of a gas pipeline material strength testing device according to the present invention from another perspective. Figure 3 This is a side view of the overall structure of an embodiment of a gas pipeline material strength testing device according to the present invention; Figure 4 for Figure 3 A cross-sectional view along the AA direction; Figure 5 for Figure 4 Enlarged view of point B in the middle; Figure 6 This is a structural exploded view of the first extensometer of an embodiment of a gas pipeline material strength testing device of the present invention; Figure 7 for Figure 6 Enlarged view of point C in the middle.

[0019] In the diagram: 100, Specimen; 200, First extensometer; 210, First support arm; 211, Mounting arm; 212, First slide rail; 213, Second slide rail; 214, Arm body; 215, Cover plate; 220, Second support arm; 230, First clamping wheel; 231, Wheel body; 232, Wheel axle; 233, Slider; 240, Second clamping wheel; 250, Limiting pin; 260, First support; 300, Clamping component; 310, Mounting block; 3 20. Telescopic rod; 321. First rod; 330. Wedge-shaped clamp; 331. Second rod; 340. Locking rod; 350. Fixing block; 400. Adjustment part; 410. Telescopic block; 411. Block body; 412. Spring; 413. Mating block; 420. Insert plate; 430. Top rod; 431. Limiting groove; 500. Slide rod; 600. Second extensometer; 610. Third support arm; 620. Third clamping wheel; 630. Second support. Detailed Implementation

[0020] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0021] An embodiment of the gas pipeline material strength testing device of the present invention, such as... Figures 1 to 7 As shown.

[0022] A gas pipeline material strength testing device is disclosed for testing the strength of a test specimen 100, which may be a new rubber material specimen or a traditional rubber material specimen. The gas pipeline material strength testing device includes a testing platform, a first extensometer 200, and two clamping members 300. The two clamping members 300 are arranged vertically on the testing platform and are capable of clamping and stretching the test specimen 100.

[0023] A first extensometer 200 is mounted on a testing table and located between two clamping members 300. The first extensometer 200 includes a first arm 210, a second arm 220, two first clamping wheels 230, and two second clamping wheels 240. The first arm 210 is slidably mounted on the testing table. Both first clamping wheels 230 are rotatable and slidably mounted on the first arm 210 in the horizontal direction. The second arm 220 is slidably mounted below the first arm 210 via a limiting pin 250. The limiting pin 250 is set in the vertical direction. In the initial state, the second arm 220 is in contact with the bottom of the limiting pin 250, that is, the downward movement of the second arm 220 is restricted by the limiting pin 250, and the limiting pin 250 only allows the second arm 220 to move upward. Both second clamping wheels 240 are rotatable and slidably mounted on the second arm 220 in the horizontal direction. Both the first clamping wheel 230 and the second clamping wheel 240 are eccentric wheels, allowing the specimen 100 to be clamped between the two first clamping wheels 230 and the two second clamping wheels 240. In the initial state, the proximal ends of the first clamping wheels 230 and the second clamping wheels 240 are in contact with the specimen 100. Both the first support arm 210 and the second support arm 220 are provided with adjusting parts 400, which can restrict or allow the two first clamping wheels 230 and the two second clamping wheels 240 to move horizontally.

[0024] The first extensometer 200 has a first state and a second state. In the first state, the first arm 210 and the second arm 220 are relatively stationary, and the adjusting part 400 restricts the two first clamping wheels 230 and the two second clamping wheels 240 from moving in the horizontal direction. In the second state, the first arm 210 and the second arm 220 are relatively close to each other, and the adjusting part 400 allows the two first clamping wheels 230 and the two second clamping wheels 240 to move in the horizontal direction. In the initial state, the first extensometer 200 is in the first state.

[0025] The testing platform is equipped with a slide bar 500, which is set vertically. The first support arm 210 is slidably mounted on the slide bar 500 via the first support 260.

[0026] Specifically, the first clamping wheel 230 includes a wheel body 231 and a wheel axle 232. The wheel axle 232 is eccentrically positioned relative to the wheel body 231 and fixedly connected to it. The end of the wheel body 231 closest to the wheel axle 232 is called the proximal end, and the end of the wheel body 231 furthest from the wheel axle 232 is called the distal end. The structure and connection method of the second clamping wheel 240 are the same as those of the first clamping wheel 230. The wheel axle 232 of the first clamping wheel 230 is rotatable relative to the first support arm 210 and is slidable in the horizontal direction. The wheel axle 232 of the second clamping wheel 240 is rotatable relative to the second support arm 220 and is slidable in the horizontal direction.

[0027] In this embodiment, a first extensometer 200, a slide bar 500, and two clamping members 300 are set on the testing table. In use, the upper and lower ends of the specimen 100 are first clamped in the two clamping members 300 respectively, and then the specimen 100 is clamped between two first clamping wheels 230 and two second clamping wheels 240. Then, the clamping members 300 are used to stretch the specimen 100.

[0028] For ease of explanation, the portion of the specimen 100 clamped by the two first clamping rollers 230 and the two second clamping rollers 240 is referred to as the upper gauge length section. When the specimen 100 is under tension, the upper gauge length section will also be under tension. During the tensioning process of the upper gauge length section, it will cause the two first clamping rollers 230 and the two second clamping rollers 240 to rotate. By setting the first clamping rollers 230 and the second clamping rollers 240 as an eccentric structure, both the first clamping rollers 230 and the second clamping rollers 240 will rotate from the proximal end to the distal end, increasing the clamping force on the upper gauge length section and improving the clamping stability. After the friction between the first clamping rollers 230 and the second clamping rollers 240 and the upper gauge length section is sufficient to make them move synchronously with the upper gauge length section, the first clamping rollers 230 and the second clamping rollers 240 will move synchronously with the upper gauge length section they clamp.

[0029] Furthermore, under the influence of the internal stress of the upper gauge section, the upper gauge section held by the two first clamping rollers 230 and the two second clamping rollers 240 will stretch and lengthen, and the upper gauge section held by the second clamping rollers 240 will be downward relative to the upper gauge section held by the first clamping rollers 230. Since the limiting pin 250 restricts the downward movement of the second support arm 220, the second clamping rollers 240 will be driven to rotate by the upper gauge section they hold (rotating towards the proximal end), reducing their clamping force on the upper gauge section. At the same time, the second support arm 220 will continue to move upward with the first support arm 210, and the two will be relatively stationary. The first extensometer 200 is in the first state, and the adjusting part 400 restricts the two first clamping rollers 230 and the two second clamping rollers 240 from moving away from each other in the horizontal direction. Furthermore, during the aforementioned process, the built-in testing system (force sensor) inside the testing station will collect the strength parameters of the specimen 100, and the components inside the first extensometer 200 will collect the strain parameters / deformation of the specimen 100.

[0030] Afterwards, specimen 100 continues to be subjected to tension. At the instant of tensile fracture (critical point), the detection system built into the testing platform and the components inside the first extensometer 200 will record the maximum deformation data and load data. Immediately afterwards, fracture occurs. Under the influence of the internal stress of the upper gauge length section, the upper gauge length section held by the two first clamping rollers 230 and the two second clamping rollers 240 will contract and shorten, and the upper gauge length section held by the second clamping rollers 240 will be upward relative to the upper gauge length section held by the first clamping rollers 230. The clamping wheel 240 will be driven to rotate again (towards the distal end) by the upper gauge segment it is holding, increasing its clamping force on the upper gauge segment. After the second clamping wheel 240 can move synchronously with the upper gauge segment it is holding, the second clamping wheel 240 will drive the second support arm 220 to move synchronously, approaching the first support arm 210 and the first clamping wheel 230. The first extensometer 200 is in the second state. At this time, the adjusting part 400 allows the two first clamping wheels 230 and the two second clamping wheels 240 to move away from each other in the horizontal direction. Therefore, when the specimen 100 breaks and contracts and rebounds, the two first clamping wheels 230 and the two second clamping wheels 240 can be moved away from each other by the specimen 100, making room for the specimen 100, reducing the impact of the specimen 100 on the first extensometer 200, reducing the probability of damage to the first extensometer 200, extending the service life of the first extensometer 200, and providing a guarantee for the testing service of new rubber materials in gas pipeline materials.

[0031] In a further embodiment, a gas pipeline material strength testing device further includes a second extensometer 600, which is mounted on a testing platform and located below the first extensometer 200. The second extensometer 600 includes a third arm 610 and two third clamping wheels 620. The third arm 610 is slidably mounted on the testing platform, and is slidably mounted on a slide rod 500 via a second support 630. Both third clamping wheels 620 are rotatably mounted on the third arm 610. The third clamping wheels 620 are eccentric wheels, and the specimen 100 can be clamped between the two third clamping wheels 620. In the initial state, the proximal end of the third clamping wheel 620 is in contact with the specimen 100. The structure and connection method of the third clamping wheel 620 are the same as those of the first clamping wheel 230.

[0032] In this embodiment, a second extensometer 600 is provided. During use, the specimen 100 is clamped between two third clamping wheels 620. For ease of explanation, the portion of the specimen 100 clamped by the two third clamping wheels 620 is referred to as the lower gauge length segment. During the tensioning process of the specimen 100, the lower gauge length segment will also be stretched and lengthened. Furthermore, during the tensioning process of the lower gauge length segment, it will cause the two third clamping wheels 620 to rotate. By setting the third clamping wheels 620 to an eccentric structure, the third clamping wheels 620 will rotate from the proximal end to the distal end, increasing the clamping force of the third clamping wheels 620 on the lower gauge length segment and improving the clamping stability. Furthermore, at the instant the specimen 100 breaks under tension, the lower gauge length segment held by the two third clamping wheels 620 will contract and shorten, and spring back downwards. Consequently, the third clamping wheels 620 will be driven to rotate by the lower gauge length segment they hold (rotating towards the proximal end), reducing their clamping force on the upper gauge length segment. This weakens the impact of the specimen 100 on the second extensometer 600 when it breaks, reducing the probability of damage to the second extensometer 600 and extending its service life.

[0033] In a further embodiment, the adjustment unit 400 includes two adjustment members. The first arm 210 and the second arm 220 each include two mounting arms 211. Both mounting arms 211 are U-shaped arms, arranged face-to-face and fixedly connected in the horizontal direction, with their openings facing each other. The arrangement direction of the two mounting arms 211 is referred to as the first direction. The first support 260 is mounted on one of the mounting arms 211 of the first arm 210.

[0034] The mounting arm 211 is correspondingly set with the adjusting component, which includes a telescopic block 410, a insert plate 420, and two push rods 430. The axle 232 of the first clamping wheel 230 is parallel to the axle 232 of the second clamping wheel 240. The axle 232 directions of the first clamping wheel 230 and the second clamping wheel 240 are referred to as the second direction. The second direction is horizontal and perpendicular to the first direction. Both ends of the axle 232 of the first clamping wheel 230 and the second clamping wheel 240 are connected to sliders 233 by a first torsion spring. The sliders 233 can be slidably mounted on the mounting arm 211 corresponding to them along the first direction. Both push rods 430 can be slidably mounted on the mounting arm 211 along the second direction. The push rods 430 and sliders 233 are correspondingly set. In the initial state, the push rods 430 abut against the corresponding sliders 233, restricting the sliding of the sliders 233. The telescopic block 410 is slidably mounted on the mounting arm 211 and can extend and retract in the second direction. The telescopic block 410 is slidably engaged with the two top rods 430.

[0035] The insert plate 420 is mounted on the mounting arm 211. In the first arm 210, the insert plate 420 is located at the lower end of the two mounting arms 211. The insert plate 420 can be inserted into the telescopic block 410 on the two mounting arms 211 of the second arm 220 below it, causing the telescopic block 410 to extend in the second direction. In the second arm 220, the insert plate 420 is located at the upper end of the two mounting arms 211. The insert plate 420 can be inserted into the telescopic block 410 on the two mounting arms 211 of the first arm 210 above it, causing the telescopic block 410 to extend in the second direction.

[0036] The mounting arm 211 has a first sliding groove 212 and a second sliding groove 213. The first sliding groove 212 is arranged along a first direction, and the slider 233 and the push rod 430 are both slidably installed in the first sliding groove 212. The second sliding groove 213 is arranged along a second direction, and the telescopic block 410 is slidably installed in the second sliding groove 213.

[0037] Both top rods 430 have limit grooves 431, which are waist-shaped grooves. The telescopic block 410 includes two blocks 411 connected by a spring 412. The insert plate 420 can be inserted between the two blocks 411. Both blocks 411 are provided with mating blocks 413, which are set one-to-one with the limit grooves 431. The mating blocks 413 slide with their corresponding limit grooves 431, and in the initial state, the two mating blocks 413 are far apart from each other in the second direction.

[0038] Furthermore, the insert plate 420 installed on the mounting arm 211 of the first arm 210 is offset from the insert plate 420 installed on the mounting arm 211 of the second arm 220 in the first direction, and the thickness of the block 411 of the telescopic block 410 in the first direction is greater than the thickness of the insert plate 420 in the first direction, thereby enabling the insert plate 420 to be misaligned with the telescopic block 410 and to be smoothly inserted.

[0039] Specifically, the mounting arm 211 includes an arm body 214 and a cover plate 215. The arm body 214 has a U-shaped structure, and the telescopic block 410 is fixed to the cover plate 215. The cover plate 215 is locked to the arm body 214 by screws. The limit pin 250 is installed on the cover plate 215.

[0040] In the initial state, the sliding of slider 233 in the first direction is restricted by top rod 430, so that when stretching specimen 100, the first extensometer 200 is in the first state, and the first clamping wheel 230 and the second clamping wheel 240 can work normally.

[0041] At the instant the specimen 100 breaks under tension, the first arm 210 and the second arm 220 are relatively close to each other, and the first extensometer 200 is in the second state. When the first arm 210 and the second arm 220 are relatively close to each other in the vertical direction, taking the insert plate 420 installed on the two mounting arms 211 of the first arm 210 as an example, the insert plate 420 will be inserted into the telescopic block 410 (on the mounting arm 211 of the second arm 220) located below it, and the telescopic block 410 will be stretched in the second direction. The stretching of the telescopic block 410 will cause the two push rods 430 to move away from each other in the first direction through the mating block 413 on it, thereby causing the push rod 430 to disengage from the corresponding slider 233 and no longer restricting the slider 233 to slide in the first direction. Therefore, when the specimen 100 contracts and rebounds, the two first clamping rollers 230 and the two second clamping rollers 240 can be moved away from each other in the first direction by the specimen 100, making way for the specimen 100 and reducing the impact of the specimen 100 on the first extensometer 200.

[0042] In a further embodiment, two clamping members 300 are arranged facing each other in the vertical direction. Each clamping member 300 includes a mounting block 310, a telescopic rod 320, and two wedge-shaped clamping blocks 330. The mounting block 310 is mounted on the testing table and can move up and down relative to the testing table. The telescopic rod 320 is arranged vertically and is mounted in the mounting block 310 and can move up and down. The two wedge-shaped clamping blocks 330 are slidably mounted in the mounting block 310, defining a clamping space between the two wedge-shaped clamping blocks 330. Both wedge-shaped clamping blocks 330 are engaged with the telescopic rod 320, and when the telescopic rod 320 moves up and down, the two wedge-shaped clamping blocks 330 can move synchronously with it, moving closer or further apart from each other, thus changing the size of the clamping space.

[0043] Furthermore, the telescopic rod 320 is provided with a first rod 321, and each of the two wedge-shaped clamping blocks 330 is provided with a second rod 331. The mounting block 310 has a first groove and two second grooves. The first groove is an oblong groove and is arranged vertically. The first rod 321 is slidably installed in the first groove. The second grooves are oblong grooves and are inclined. The second rods 331 are arranged in a one-to-one correspondence with the second grooves, and the second rods 331 are slidably installed in their corresponding second grooves. The clamping member 300 also includes a locking rod 340. The locking rod 340 is rotatably installed on the mounting block 310 by a second torsion spring, and the locking rod 340 has a third groove. The third groove is an oblong groove and slides in cooperation with the first rod 321.

[0044] Specifically, a hydraulic drive mechanism is installed on the testing platform, and a fixing block 350 is fixedly installed on the mounting block 310. The fixing block 350 is located at the output end of the hydraulic drive mechanism, so that when the upper and lower ends of the specimen 100 are clamped between the two clamping members 300, the hydraulic drive mechanism can be activated to stretch the specimen 100.

[0045] In use, in the initial state, the second torsion spring, via the locking rod 340, causes the first rod 321 to be lowered. This causes the telescopic rod 320 to move the two wedge-shaped clamps 330 closer together, ensuring that the clamping space defined by the two wedge-shaped clamps 330 is sufficient to clamp the specimen 100. When it is necessary to install the specimen 100, the operator rotates the locking rod 340, which in turn pushes the first rod 321 upward. The upward movement of the first rod 321, via the telescopic rod 320, causes the two wedge-shaped clamps 330 to move upward, thus moving them away from each other and increasing the clamping space to place the specimen 100. Afterward, simply releasing the locking rod 340 allows it to rotate under the action of the second torsion spring, which in turn causes the two wedge-shaped clamps 330 to reset via the telescopic rod 320, clamping the end of the specimen 100.

[0046] Based on the above embodiments, the specific working process is as follows: In operation, specimen 100 is first installed. The operator rotates the locking lever 340, which in turn pushes the first lever 321 upward. This upward movement of the first lever 321, via the telescopic lever 320, causes the two wedge-shaped clamping blocks 330 to move upward, thus distancing them from each other and increasing the clamping space to accommodate specimen 100. Then, simply releasing the locking lever 340 allows it to rotate under the action of the second torsion spring, which in turn causes the two wedge-shaped clamping blocks 330 to reset via the telescopic lever 320, clamping the end of specimen 100. Specimen 100 is then clamped between the two first clamping rollers 230, the two second clamping rollers 240, and the two third clamping rollers 620. Finally, the hydraulic drive mechanism is activated to stretch specimen 100.

[0047] For ease of explanation, the portion of the specimen 100 clamped by the two first clamping rollers 230 and the two second clamping rollers 240 is referred to as the upper gauge length section. When the specimen 100 is under tension, the upper gauge length section will also be under tension. During the tensioning process of the upper gauge length section, it will cause the two first clamping rollers 230 and the two second clamping rollers 240 to rotate. By setting the first clamping rollers 230 and the second clamping rollers 240 as an eccentric structure, both the first clamping rollers 230 and the second clamping rollers 240 will rotate from the proximal end to the distal end, increasing the clamping force on the upper gauge length section and improving the clamping stability. After the friction between the first clamping rollers 230 and the second clamping rollers 240 and the upper gauge length section is sufficient to make them move synchronously with the upper gauge length section, the first clamping rollers 230 and the second clamping rollers 240 will move synchronously with the upper gauge length section they clamp.

[0048] Furthermore, under the influence of the internal stress of the upper gauge section, the upper gauge section held by the two first clamping rollers 230 and the two second clamping rollers 240 will stretch and lengthen, and the upper gauge section held by the second clamping rollers 240 will be downward relative to the upper gauge section held by the first clamping rollers 230. Since the limiting pin 250 restricts the downward movement of the second support arm 220, the second clamping rollers 240 will be driven to rotate by the upper gauge section they hold (rotating towards the proximal end), reducing their clamping force on the upper gauge section. At the same time, the second support arm 220 will continue to move upward with the first support arm 210, and the two will be relatively stationary. The first extensometer 200 is in the first state, and the adjusting part 400 restricts the two first clamping rollers 230 and the two second clamping rollers 240 from moving away from each other in the horizontal direction. Furthermore, during the aforementioned process, the built-in testing system (force sensor) inside the testing station will collect the strength parameters of the specimen 100, and the components inside the first extensometer 200 will collect the strain parameters / deformation of the specimen 100.

[0049] Afterwards, the specimen 100 continues to be stretched until it breaks. At the instant the specimen 100 breaks under tension (critical point), the detection system built into the test bench and the components inside the first extensometer 200 will record the maximum deformation data and load data. Immediately afterward, the fracture occurs. Under the influence of the internal stress of the upper gauge section, the upper gauge section held by the two first clamping rollers 230 and the two second clamping rollers 240 will shrink and shorten. The upper gauge section held by the second clamping rollers 240 will be upward relative to the upper gauge section held by the first clamping rollers 230. The second clamping rollers 240 will be driven to rotate again (towards the distal end) by the upper gauge section they hold, increasing their clamping force on the upper gauge section. After the second clamping rollers 240 can move synchronously with the upper gauge section they hold, the second clamping rollers 240 will drive the second support arm 220 to move synchronously, approaching the first support arm 210 and the first clamping rollers 230. The first extensometer 200 is in the second state. When the first arm 210 and the second arm 220 are relatively close to each other in the vertical direction, taking the insert plate 420 installed on the two mounting arms 211 of the first arm 210 as an example, the insert plate 420 is inserted into the telescopic block 410 (on the mounting arm 211 of the second arm 220) located below it, which stretches the telescopic block 410 in the second direction. The stretching of the telescopic block 410 will cause the two push rods 430 to move away from each other in the first direction through the mating block 413 on it, thereby causing the push rods 430 to disengage from their corresponding sliders 233, and no longer restricting the sliders 233 from sliding in the first direction. Therefore, when the specimen 100 retracts and rebounds, the two first clamping rollers 230 and the two second clamping rollers 240 can all move away from each other in the first direction, making room for the specimen 100, which can reduce the impact of the specimen 100 on the first extensometer 200.

[0050] During the tensile process of specimen 100, the lower gauge length segment will also lengthen under tension. During this tension, the lower gauge length segment will cause the two third clamping wheels 620 to rotate. By setting the third clamping wheels 620 to an eccentric structure, they will rotate from the proximal end to the distal end, increasing the clamping force of the third clamping wheels 620 on the lower gauge length segment and improving clamping stability. Furthermore, at the instant specimen 100 fractures under tension, the lower gauge length segment clamped by the two third clamping wheels 620 will contract and shorten, and spring back downwards. At this moment, the third clamping wheels 620 will be driven to rotate by the lower gauge length segment they are clamping (rotating towards the proximal end), reducing their clamping force on the upper gauge length segment. This weakens the impact of specimen 100 on the second extensometer 600 upon fracture, reducing the probability of damage to the second extensometer 600 and extending its service life.

[0051] This invention also provides a method for testing the strength of gas pipeline materials, utilizing the aforementioned gas pipeline material strength testing device, comprising the following steps: S10, clamp the specimen 100 between the two clamping members 300 and stretch the specimen 100.

[0052] S20, during the tensile process of specimen 100, the first extensometer 200 is in the first state, the first support arm 210 and the second support arm 220 are relatively stationary, the adjustment part 400 restricts the two first clamping rollers 230 and the two second clamping rollers 240 to move in the horizontal direction, and at this time the first extensometer 200 will collect the strain parameters / deformation of specimen 100.

[0053] S30, when the specimen 100 is fractured under tension, the fractured part of the specimen 100 undergoes violent contraction and rebound, causing the first arm 210 and the second arm 220 to move closer together. The first extensometer 200 is in the second state. The adjustment part 400 allows the two first clamping rollers 230 and the two second clamping rollers 240 to move in the horizontal direction, automatically releasing the rigid clamping on the specimen 100 and weakening the impact of the fracture rebound of the specimen 100 on the first extensometer 200.

[0054] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. A gas pipeline material strength testing device, used to test the strength of test specimens, characterized in that: The device includes a testing platform, a first extensometer, and two clamping components. The two clamping components are arranged vertically on the testing platform and can clamp and stretch the specimen. The first extensometer is mounted on the testing platform and located between the two clamping components. The first extensometer includes a first arm, a second arm, two first clamping wheels, and two second clamping wheels. The first arm is slidably mounted on the testing platform. Both first clamping wheels are rotatable and can be slidably mounted on the first arm in the horizontal direction. The second arm is slidably mounted below the first arm by a limiting pin. In the initial state, the limiting pin only allows the second arm to move upward. Both second clamping wheels are rotatable and can be slidably mounted on the second arm in the horizontal direction. Both the first and second clamping wheels are eccentric wheels, and the specimen can be clamped between the two first clamping wheels and the two second clamping wheels. In the initial state, the proximal end of the first and second clamping wheels is in contact with the specimen. Both the first and second arms are provided with adjustment parts, which can restrict or allow the two first clamping wheels and the two second clamping wheels to move in the horizontal direction. The first extensometer has a first state and a second state. In the first state, the first arm and the second arm are relatively stationary, and the adjusting part restricts the two first clamping wheels and the two second clamping wheels from moving in the horizontal direction. In the second state, the first arm and the second arm are relatively close to each other, and the adjusting part allows the two first clamping wheels and the two second clamping wheels to move in the horizontal direction. The first extensometer is in the first state in the initial state.

2. The gas pipeline material strength testing device according to claim 1, characterized in that: It also includes a second extensometer, which is mounted on the test table and located below the first extensometer. The second extensometer includes a third arm and two third clamping wheels. The third arm is slidably mounted on the test table, and the two third clamping wheels are rotatably mounted on the third arm. The third clamping wheels are eccentric wheels, and the specimen can be clamped between the two third clamping wheels. In the initial state, the proximal end of the third clamping wheel is in contact with the specimen.

3. The gas pipeline material strength testing device according to claim 2, characterized in that: The testing platform is equipped with a sliding rod, which is set vertically. The first arm is slidably mounted on the sliding rod via the first support, and the third arm is slidably mounted on the sliding rod via the second support.

4. The gas pipeline material strength testing device according to claim 1, characterized in that: Both the first clamping wheel and the second clamping wheel include a wheel body and a wheel axle. The wheel axle is eccentrically arranged relative to the wheel body and fixedly connected to the wheel body. The wheel axle of the first clamping wheel is rotatable relative to the first support arm and is slidable in the horizontal direction. The wheel axle of the second clamping wheel is rotatable relative to the second support arm and is slidable in the horizontal direction.

5. The gas pipeline material strength testing device according to claim 4, characterized in that: The adjustment unit includes two adjustment components. Each of the first and second arms includes two mounting arms, both of which are U-shaped. The two mounting arms are arranged face-to-face and fixedly connected in the horizontal direction; the arrangement direction of the two mounting arms is referred to as the first direction. Each mounting arm corresponds to one of the adjustment components. Each adjustment component includes a telescopic block, a insert plate, and two push rods. The axle direction of the first clamping wheel is parallel to the axle direction of the second clamping wheel; the axle directions of the first and second clamping wheels are referred to as the second direction. The second direction is horizontal and perpendicular to the first direction. Both ends of the axles of the first and second clamping wheels are connected to sliders via first torsion springs. The sliders are slidably mounted on their corresponding mounting arms along the first direction. Both push rods are slidably mounted on the mounting arm in the second direction, and the push rods and sliders are set one-to-one. In the initial state, the push rods abut against their corresponding sliders. The telescopic block is slidably mounted on the mounting arm and can extend and retract in the second direction. The telescopic block and the two push rods slide together. The insert plate is mounted on the mounting arm. In the two mounting arms of the first arm, the insert plate is located at the lower end of the two mounting arms. The insert plate can be inserted into the telescopic block located below it and causes the telescopic block to extend in the second direction. In the two mounting arms of the second arm, the insert plate is located at the upper end of the two mounting arms. The insert plate can be inserted into the telescopic block located above it and causes the telescopic block to extend in the second direction.

6. The gas pipeline material strength testing device according to claim 5, characterized in that: Both top rods have limit grooves, which are waist-shaped. The telescopic block consists of two blocks connected by a spring. The insert plate can be inserted between the two blocks. Both blocks are equipped with mating blocks, which correspond one-to-one with the limit grooves. The mating blocks slide with their corresponding limit grooves, and in the initial state, the two mating blocks are far apart from each other in the second direction.

7. The gas pipeline material strength testing device according to claim 6, characterized in that: The insert plate installed on the mounting arm of the first arm is offset from the insert plate installed on the mounting arm of the second arm in the first direction, and the thickness of the telescopic block in the first direction is greater than the thickness of the insert plate in the first direction.

8. The gas pipeline material strength testing device according to claim 1, characterized in that: Two clamping components are arranged facing each other in the vertical direction. Each clamping component includes a mounting block, a telescopic rod, and two wedge-shaped clamping blocks. The mounting block is mounted on the testing table and can move up and down relative to the testing table. The telescopic rod is arranged in the vertical direction and is mounted in the mounting block and can move up and down. The two wedge-shaped clamping blocks are slidably mounted in the mounting block, and a clamping space is defined between the two wedge-shaped clamping blocks. The two wedge-shaped clamping blocks are engaged with the telescopic rod, and when the telescopic rod moves up and down, the two wedge-shaped clamping blocks can move synchronously with it, and the two wedge-shaped clamping blocks move closer to each other or further away from each other.

9. A gas pipeline material strength testing device according to claim 8, characterized in that: The telescopic rod is equipped with a first rod, and each of the two wedge-shaped clamping blocks is equipped with a second rod. The mounting block has a first groove and two second grooves. The first groove is an oblong groove and is set vertically. The first rod is slidably installed in the first groove. The second groove is an oblong groove and is set at an angle. The second rod is set in a one-to-one correspondence with the second groove and is slidably installed in its corresponding second groove. The clamping component also includes a locking rod. The locking rod is rotatably installed on the mounting block by a second torsion spring, and the locking rod has a third groove. The third groove is an oblong groove and slides in cooperation with the first rod.

10. A method for testing the strength of gas pipeline materials, utilizing a gas pipeline material strength testing device as described in any one of claims 1 to 9, characterized in that: Includes the following steps: S10, clamp the specimen between two clamping members and stretch the specimen; S20, during the tensile process of the specimen, the first extensometer is in the first state, the first arm and the second arm are relatively stationary, and the adjustment part restricts the two first clamping wheels and the two second clamping wheels from moving in the horizontal direction; and at this time, the first extensometer will collect the strain parameters / deformation of the specimen. S30, when the specimen breaks under tension, the first extensometer is in the second state, the first arm and the second arm are relatively close to each other, and the adjustment part allows the two first clamping wheels and the two second clamping wheels to move in the horizontal direction.

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